CN107311478A

CN107311478A - White clay reclaims the energy saving and environment friendly recovery method of comprehensive utilization

Info

Publication number: CN107311478A
Application number: CN201710703803.7A
Authority: CN
Inventors: 杨泽荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-08-16
Filing date: 2017-08-16
Publication date: 2017-11-03
Anticipated expiration: 2037-08-16
Also published as: CN107311478B

Abstract

The invention discloses the energy saving and environment friendly recovery method that white clay reclaims comprehensive utilization, only connected between the dewaterer discharge end and calcining furnace feed end by calcining screw elevator, the dehydration white clay that the discharge end that the waste heat produced in the cooler cooling procedure is back to dewaterer by the heat pipe of one-way transmission is discharged to it carries out one-level preheating, the high-temperature gas of calcining carries out two grades of preheatings to the dehydration white clay for entering calcining furnace from calcining screw elevator in calcining furnace simultaneously, so that being formed in the calcining screw elevator by dewaterer discharge end to the uniform elevated preheating cavity of its preheating temperature of calcining furnace feed end, dehydration white clay is directly entered calcining furnace calcining after completing preheating during calcining screw elevator screw lifting；The sulfur-containing smoke gas produced in the calcination process is passed through desulfurizing tower from the high-temperature flue gas outlet positioned at calcining body of heater tail end by flue.Material and the energy in present invention comprehensive utilization white clay recovery, it is both economically and environmentally beneficial.

Description

White clay reclaims the energy saving and environment friendly recovery method of comprehensive utilization

Technical field

It is that white clay reclaims comprehensive utilization specifically the present invention relates to white clay utilization technology field in paper technology Energy saving and environment friendly recovery method.

Background technology

Soda pulping process is widely used technique in current most of pulp and paper making.In the causticization mistake of soda pulping process papermaking Cheng Zhonghui produces the substantial amounts of white clay using winnofil as main component.During causticization is the green liquor for producing soda pulping process papermaking Na₂CO₃With Ca (OH)₂Generation causticizing reaction, generation white liquor containing NaOH and aCO containing precipitate C₃The course of reaction of white clay.According to inspection Survey, contain CaCO in the white clay that paper mill is reclaimed₃、NaOH、Ca(OH)₂, CaO, S etc., wherein CaCO₃Content is 80%-92%.

White clay, is the Main By product that paper industry to black liquor of pulp making produce in alkali recovery process, its primary chemical Composition is calcium carbonate, in addition also containing impurity such as some calcium oxide, silicon, metal salts.At present, in alkali recovery process, 1 ton is reclaimed Alkali can isolate 2-2.2 tons of white clays simultaneously, therefore white clay is one of discarded object of power boiler discharge of papermaking industry.

The major way of conventional harmless treatment paper white sludge includes：

A1 is sintered into lime and recycled in alkali collection workshop section；

A2 Hydrolysis kinetics calcium carbonate is used as papermaking filler and for producing the construction materials such as cement, coating；

White clay is used as the fume desulfurizing agent of coal-burning boiler by A3；

4. white clay is discarded directly to bury.

But, the extraction efficiency of existing burning of lime sludge into lime or Hydrolysis kinetics calcium carbonate is not high, the economic valency of byproduct Value is limited；The fume desulfurizing agent that white clay is used as coal-burning boiler needs to have " having coal-burning boiler " this precondition, uses scope It is limited；Discarded white clay is directly buried, and can cause environmental pollution.

On the other hand, burning of lime sludge can be recycled to white clay really into lime or Hydrolysis kinetics calcium carbonate And increase the income of byproduct, but existing recovery process, recovery method only focus on the recovery of this material of white clay, and it is seldom There is technical scheme to consider other auxiliary materials in white clay removal process, the energy of consumption, the processing of other emissions.

The content of the invention

It is an object of the invention to provide the energy saving and environment friendly recovery method that white clay reclaims comprehensive utilization, white clay was both improved and had carried The organic efficiency of product is taken, the heat energy needed in removal process, water energy, the also gas to being produced in removal process are made full use of again Just it is allowed to discharge after carrying out environmental protection treatment, whole recovery method considers the factors such as production efficiency, energy-saving and emission-reduction, to white clay Material, the energy in overall process is reclaimed to be comprehensively utilized, it is both economically and environmentally beneficial.

The present invention is achieved through the following technical solutions：White clay reclaims the energy saving and environment friendly recovery method of comprehensive utilization, will make Band residual alkali white clay after the causticization that paper is produced carries out dewaterer dehydration, calcining furnace calcining, cooler cooling, grey calcium machine grinding successively Sorting is made the sulfur-containing smoke gas produced in finished product, the calcining furnace calcination process and is passed through desulfurizing tower progress desulfurization；The calcining furnace To calcine the electrothermal rotary calcining stove that body of heater is obliquely installed, calcining body of heater sets the import of dehydration white clay, the outlet of high temperature ashes, height Warm exhanst gas outlet.

Only connected between the dewaterer discharge end and calcining furnace feed end by calcining screw elevator, the cooler The dehydration white clay that the discharge end that the waste heat produced in cooling procedure is back to dewaterer by the heat pipe of one-way transmission is discharged to it One-level preheating is carried out, while dehydration of the high-temperature gas of calcining to entering calcining furnace from calcining screw elevator is white in calcining furnace Mud carries out two grades of preheatings so that formed in the calcining screw elevator by its preheating of dewaterer discharge end to calcining furnace feed end The uniform elevated preheating cavity of temperature, dehydration white clay is directly entered after completing preheating during calcining screw elevator screw lifting Calcining furnace is calcined.

The dehydration white clay is with 5-6kg/m3min flows from the dehydration white clay import positioned at the higher tail end of calcining body of heater Into rotary calcining stove, the calcining body of heater that 3 ° ± 0.1 ° and inwall setting protruding canine teeth are rotated, tilted with 1-5r/min is slow transitted through, The fully calcined of 15-30min is carried out with 255 DEG C -1210 DEG C of calcining heat in calcining furnace body, the ashes after calcining is from positioned at forging High temperature ashes outlet delivery to the cooler for burning the relatively low head end of body of heater is cooled down；The sulfur-containing smoke gas produced in the calcination process from High-temperature flue gas outlet positioned at calcining body of heater tail end by flue is passed through desulfurizing tower.

The applicant have submitted the patent application of a utility model for 07 month on the 24th in 2017 to State Intellectual Property Office, Application No.：201720900026.0；Patent name is：White clay reclaims the energy saving and environment friendly recovery system of comprehensive utilization, open The technical scheme of a set of recovery system.The white clay reclaims the energy saving and environment friendly recovery system of comprehensive utilization, including connects successively White clay material box, centrifugal dehydrator, rotary calcining stove, revolution cooler, grey calcium grader, the finished product packing machine, described time connect Turn calcining furnace to be also connected with flue and be connected with desulfurizing tower by flue.

Heretofore described recovery method is can to carry out white clay recycling by above-mentioned recovery system.

The dewaterer used in the present invention in dehydration procedure is centrifugal dehydrator.What is used in the present invention in calcination process forges Burn the rotary calcining stove that stove is the electrothermal that temperature controllable regulates and controls.The cooler used in the present invention in refrigerating work procedure returns for water-cooled Turn cooler.The grey calcium machine used in the present invention in grinding classification process is grey calcium grader.

By calcining spiral shell between the dehydration lime mud outlet of the centrifugal dehydrator and the dehydration white clay entrance of rotary calcining stove Revolve elevator connection.The unidirectional heat transfer of heat recovery is communicated between the revolution cooler and calcining screw elevator Heat pipe.

Recovery system of the present invention, based on the solid flow crossover of white clay main component, including is sequentially connected White clay material box, centrifugal dehydrator, rotary calcining stove, revolution cooler, grey calcium grader, finished product packing machine.

In said structure, the white clay raw material with residual alkali that paper-making process is produced is stored in white clay material box, carries out white clay During reclaimer operation：

The white clay raw material with residual alkali is dehydrated into centrifugal dehydrator in A, white clay material box, the solid after separation of solid and liquid For dehydration white clay and liquid is the residual alkali aqueous solution (mixed liquor based on sodium hydroxide)；

B, dehydration white clay enter rotary calcining stove and first dry sierozem power (calcium carbonate powder or the pulverized limestone for being sintered into solid again End)；

The high temperature sierozem power discharged in C, rotary calcining stove enters revolution cooler and cooled down；

D, the cooling sierozem power of revolution cooler discharge enter ash charge calcium grader and are ground, are classified；

Sierozem power after E, classification is packed into finished product packing machine.

Wherein, when rotary calcining stove its high-temperature calcination office work temperature control is at 255 DEG C -310 DEG C, high temperature sierozem power Based on Paris white；When rotary calcining stove its high-temperature calcination office work temperature control is at 800 DEG C -1000 DEG C, high temperature ash Calcium powder is based on calcium oxide powder and Paris white mixture；When rotary calcining stove, its high-temperature calcination office work temperature control exists At 1100 DEG C -1200 DEG C, high temperature sierozem power is based on pulverized limestone with calcium oxide powder.

The main component of white clay is CaCO₃、NaOH、Ca(OH)₂, CaO, S, many reactions can occur in white clay heating process, Wherein key reaction has：

Ca(OH)₂+SO₂=CaSO₃+H₂O 2CaSO₃+O₂=O₂=2CaSO₄

2NaOH+SO₂=Na₂SO₃+H₂O 2Na₂SO₃+O₂=2Na₂SO₄

(1) when below 350 DEG C of calcining heat, mainly with combustion of sulfur generation sulfur dioxide gas, calcium hydroxide and titanium dioxide Reaction of Salmon-Saxl generation calcium sulfate, sodium hydroxide and sulfur dioxide reaction generation sodium sulphate are key reaction.Found through experiment, white clay adds Just there is SO when heat is to 230 DEG C₂Release, the SO at 260 DEG C₂Release has reached a peak value；On the one hand, SO₂With high-temperature flue gas from return Turn to be expelled to desulfurizing tower in calcining furnace；On the other hand, with CaCO₃、NaOH、Ca(OH)₂Occur " Gu sulphur " reaction and generate sulfuric acid Salt.

Experiments verify that, when calcining heat control is at 260 DEG C, Paris white preparation rate highest.

(2) during more than 800 DEG C of calcining heat, calcium carbonate, calcium sulfate have started to decompose, and produce carbon dioxide, dioxy Change sulphur gas.

Find that when calcining heat is more than 1100 DEG C, the preparation rate of calcium oxide is that can reach more than 98% through experiment.

Calcium carbonate accounting, calcium oxide accounting homogeneous quality percentage in the present invention.

In addition, the residual alkali aqueous solution of centrifugal dehydrator discharge can be recycled after reclaiming into paper technology, or Be passed through desulfurizing tower carry out desulfurization process, not only by recycle save Material Cost and also reduce strong basicity pollutant process into This, it is both economically and environmentally beneficial.

In said structure, the flue gas of sulfur-bearing can be produced in rotary calcining stove, the recovery system can also be carried out at flue gas Reason：

M, the air exhauster being arranged in flue work, by wind-force by the high temperature cigarette in its high-temperature calcination room of rotary calcining stove Gas and high temperature sierozem power carry out solid and gas separation and introduce desulfurizing tower desulfurization by flue；

N, the high-temperature flue gas of solid and gas separation enter desulfurizing tower by flue and carry out desulfurization process, desulfurization flue gas ability up to standard Discharge.

Wherein, desulfurizing tower sprays the residual alkali aqueous solution or white clay suspension from the top down, and high-temperature flue gas is moved from bottom to top, Desulfurizing agent is fully contacted with high-temperature flue gas, other natural excrement such as carbon dioxide after desulfurization, the solid-liquid produced in sweetening process Mixture natural subsidence, had not only cooled but also desulfurization.Flue gas desulfurization course can be carried out without the material that increase is additionally purchased to flue gas Meet the desulfurization process of environmental requirement, it is both economically and environmentally beneficial.

To sum up, recovery system of the present invention can be produced by dehydration, high-temperature calcination, cooling, grinding classification from papermaking High efficiency extraction sierozem power (Paris white or pulverized limestone) in raw white clay, can enter papermaking by the residual alkali water solution cycle of separation again Technique, moreover it is possible to carry out the desulfurization process of sulfur-containing smoke gas using white clay and produce certain gypsum.Whole recovery system is useless to papermaking The solid (Paris white, pulverized limestone, gypsum) that is produced in gurry white clay removal process, liquid (the residual alkali aqueous solution), gas (desulfurization Carbon dioxide afterwards) comprehensively utilized or handled, it is both economically and environmentally beneficial.

What deserves to be explained is, the present invention makes full use of to the heat energy in whole system：One is, pre- in rotary calcining stove Heated drying room and the height two ends that high-temperature calcination room is all a chamber, and tilt to the high-end for preheating of its inner chamber of thermal insulation furnace body Hothouse, bottom be in the high-temperature calcination room for being separately provided electric heater unit, high-temperature calcination room heat in its inner chamber of thermal insulation furnace body Preheating and drying room is inside radiated to the dehydration white clay just into rotary calcining stove is further dried；Two are, whole system It is also provided with the heat pipe that connection revolution cooler is dehydrated white clay entrance point with rotary calcining stove；The heat pipe will be turned round in cooler The waste heat that heat exchange is produced is transmitted back in the second lifting device, just with waste heat to the dehydration white clay discharged from centrifugal dehydrator Preheated and further dehydrated.The water content of white clay is lower in into high-temperature calcination room, need consumption heat energy fewer.This Invention using high-temperature calcination room discharge waste heat progress the pre-heat treatment, without be additionally provided heat energy further can effectively reduce into Enter the water content of white clay in high-temperature calcination room, greatly shorten the time of high-temperature calcination, save the energy.

The inwall of the high-temperature calcination room sets some protruding canine teeth；The protruding canine teeth is the flange higher than high-temperature calcination chamber interior walls. Flange in the present invention can repeatedly be hit with the dehydration white clay in high-temperature calcination room, so as to break up white clay block, further Improve high-temperature calcination efficiency.Further, the flange is lower end close to one end of high-temperature calcination chamber interior walls, and the cross section of flange is in Up-small and down-big structure.The flange is up-small and down-big, it is possible to use cutting-edge structure preferably hits the white clay block of caking, and enhancing is broken up Effect.Further, the lower end of the flange and high-temperature calcination chamber interior walls rounding off.The flange and high-temperature calcination chamber interior walls Rounding off, effectively prevents white clay block from fawning on flange or high-temperature calcination chamber interior walls.

The revolution cooler includes setting the cooling body of afterheat return mouthful, interior is enclosed in cooler body and and cooler Revolving drum, the cold water spray device in cooling chamber of body formation cooling chamber.

The cold water spray device is included in shower, water inlet pipe, outlet pipe, water tank, the water pump of circulation connection, water tank Cooling water is pressurizeed by water pump is pumped through the water inlet pipe of cooling body, and cooling water is from the spray in cooling chamber in water inlet pipe Pipe is to revolution drum outer wall injection, and the cooling water ejected is sprayed onto revolution drum outer wall and carried out with high temperature ashes in revolving drum after heat exchange Fall and be back to water tank from the outlet pipe through cooling body.

The heat pipe carries out the unidirectional heat transfer from revolution cooler to calcining screw elevator, and the evaporation ends of heat pipe are positioned at cold But intracavitary and close to outlet pipe one end, the calcining spiral that the condensation end of heat pipe is located between centrifugal dehydrator and rotary calcining stove is carried In the machine of liter.Inside heat pipe closing, do not connect with external.The waste heat for turning round heat exchange in cooler is transferred to by heat pipe Calcine in screw elevator, the dehydration white clay being not yet dehydrated completely discharged from centrifugal dehydrator is carried out predrying.

Multiple spray heads to revolution drum outer wall spray cooling water are set on the shower.

The outer wall for the revolving drum for internally leading to high temperature sierozem power by the cold water spray device of circulating chilled water in the present invention is carried out Continuous-flow type cooling spray.High temperature sierozem power, cooling water water only carry out heat exchange in revolution drum outer wall and are not directly contacted with, high temperature ash Calcium powder keeps dry state while cooling.And cooling water is only in shower, water inlet pipe, outlet pipe, water tank, water pump, cooling chamber Interior circulation.

In order to preferably realize in the present invention, the calcining furnace calcination process, by controlling after calcining heat control calcining The main component of ashes, is specifically referred to：

Calcining heat is controlled to 255 DEG C -310 DEG C ashes being made using calcium carbonate as main component；

Calcining heat is controlled to 800 DEG C -1000 DEG C ashes being made using the mixture of calcium carbonate and calcium oxide as main component Powder；

Calcining heat is controlled to 1100 DEG C -1200 DEG C ashes being made using calcium oxide as main component.

In order to preferably realize in the present invention, the calcining furnace calcination process, control calcining heat is to 260 DEG C and to forge Burn white clay and be detained more than 15min, the ashes that calcium carbonate mass ratio is not less than % is made.

In order to preferably realize in the present invention, the calcining furnace calcination process, control calcining heat is to 800 DEG C and to forge Burn white clay and be detained more than 15min, the ashes that calcium oxide mass ratio is not less than 50% is made.

In order to preferably realize in the present invention, the calcining furnace calcination process, control calcining heat is to 1000 DEG C and causes Calcine white clay and be detained more than 15min, the ashes that calcium oxide mass ratio is not less than 75% is made.

In order to preferably realize in the present invention, the calcining furnace calcination process, control calcining heat is to 1100 DEG C and causes Calcine white clay and be detained more than 15min, the ashes that calcium oxide mass ratio is not less than 98% is made.

In order to preferably realize the present invention, the protruding canine teeth is to be arranged on calcining inboard wall of furnace body and slided to calcining body of heater center light Its regularity of distribution of some protruding canine teeth and single protruding canine teeth size that wall is distributed in prominent convex portion, calcining furnace body meet following condition： Tail end from calcining body of heater is to head end, and the distributions of a plurality of protruding canine teeth is by dredging the size of gradually close and single protruding canine teeth by gradually small greatly.

In order to preferably realize the dewaterer used in the present invention, the dewaterer dehydration for built-in concentrator bowl, change Frequency device, centrifugation motor, clutch, the centrifugal dehydrator of speed probe, centrifugal dehydrator also set up dehydration controller, dehydration control Device processed centrifuges rotating change and the rotational speed regulation of motor by Frequency Converter Control, while being dehydrated the company that controller controls clutch Connect/disengage, drive concentrator bowl to act by clutch by centrifugation motor；Wherein, concentrator bowl is rotated clockwise as rotating forward, concentrator bowl Rotate counterclockwise as reversion.

In the dewaterer dehydration, the rotating speed of concentrator bowl is in cyclically-varying, is specifically referred to：In a cycle, from Heart cylinder is rotated forward since rotating speed is 0 rev/min, first interior at 5-15 second linearly to raise speed to 600-700 revs/min and continue rotating forward 1 Minute, then it was decelerated to 0 rev/min naturally in 1 minute, stalling starts reversion after 0-10 seconds, the linear speed-raising in 5-15 seconds To 600-700 revs/min and continue reversion 1 minute, then be decelerated in 1 minute 0 rev/min naturally, stall 10-30 seconds, together A collection of band residual alkali white clay is reciprocal 4-6 times by this loop cycle.

In order to preferably realize the present invention, during the dewaterer dehydration, first spin cycle, second spin cycle be also Intermittence is passed through raw water, i.e.,：When starting a cycle and the second period of dewatering work, when concentrator bowl forward or reverse When speed is less than 100 revs/min, it is passed through from what cooler was drawn and ashes progress water cooling after high-temperature calcination occurs after heat exchange High temperature raw water, using high temperature raw water to band residual alkali white clay be rinsed dealkalize.

In order to preferably realize the residual alkali liquid isolated in the present invention, the dewaterer dehydration from residual alkali white clay Directly reclaim is used for paper technology to circulate.

In order to preferably realize the residual alkali liquid isolated in the present invention, the dewaterer dehydration from residual alkali white clay First it is introduced into temporary storage barrel and deposits, desulfurizing agent is formed after the band residual alkali white clay mixing that residual alkali liquid is separated with being precipitated in white clay material box, Desulfurizing agent is sprayed into desulfurizing tower above desulfurizing tower by desulfurizing agent transfer pump desulfurization process is carried out to sulfur-containing smoke gas.

Band residual alkali white clay raw material to be recycled be first stored in white clay material box staticly settle, it is stand-by.Will be with residual alkali white clay Raw material diluted and regard this suspension as desulfurization in the invention into white clay concentration 22%-24% suspension Desulfurizing agent in tower is used, and desulfurization process is carried out to the sulfurous gas discharged from calcining furnace, so as to obtain meeting discharge standard Carbon dioxide.

The present invention is the method recycled with residual alkali white clay to entering causticization processing in paper technology.Technical side The main line recycled in case is to obtain finished product (carbonic acid through dehydration, calcining, cooling, grinding sorting as raw material with residual alkali white clay Calcium, calcium oxide, calcium carbonate and oxidation calcium compound), one of by-pass is the utilization to waste heat in calcination process, and the two of by-pass is pair Environment protection emission of the sulfur-containing smoke gas produced in calcination process after desulfurization process, the three of by-pass be to residual alkali white clay deviate from it is residual The utilization of alkali lye, the four of by-pass is with being used for desulfurizing agent is formed after residual alkali white clay mixed diluting in calcination process by residual alkali liquid The desulfurization process of sulfur-containing smoke gas.

To sum up, recovery method of the present invention, its primary raw material is：White clay raw material to be recycled, water, electric energy；Process product For：Residual alkali liquid, sulfur-containing smoke gas, the high-temperature gas of the carrying heat energy produced from calcining furnace, the carrying produced from cooler heat Can middle wet body, carry the rank of the hot water, white clay raw material of heat energy after each process by heat exchange in cooling procedure Section property product；Final product is：Residual alkali liquid, processed gas, sierozem power finished product.Wherein, the carrying heat energy produced from cooler Middle wet body can be one-way transmitted to by heat pipe calcining screw elevator front end, treat calcining dehydration white clay carry out one-level Preheating；The high-temperature gas of the carrying heat energy produced from calcining furnace, directly is used to treat from rotary furnace to dewaterer heat radiation Two grades of preheatings of the dehydration white clay of calcining.

That is, need not add other extra chemistry agent in whole recovery method, primary raw material is papermaking production Raw band residual alkali white clay, except necessary production equipment, white clay provides water, electric energy and can be achieved entirely again during recycling During material and the energy abundant recycling.

The present invention compared with prior art, with advantages below and beneficial effect：

(1) recovery method of the present invention is main by dehydration, calcining, cooling, grinding sorting, desulfurization this five process groups Into without introducing other extra chemical agents, except necessary production equipment, the raw material of input is residual for the band to be recycled utilized Soda waste mud, water, electric energy etc., output have the gas for reaching discharge standard after sierozem power finished product, desulfurization and discharging, can reuse to papermaking The residual alkali liquid of technique；That is, the white clay raw material after the causticization produced using recovery method of the present invention to papermaking is carried out During the entire process of sierozem power is reclaimed, secondary pollution will not be both produced, is also discharged without poisonous and harmful substance, and all products are all It can recycle；

(2) energy produced in its white clay removal process of recovery method of the present invention is also recycled, specifically Refer to, the waste heat produced in calcination process, in refrigerating work procedure is directed to the calcining screw elevator of connection dewaterer and rotary furnace In, the dehydration white clay by being dehydrated, being prepared to enter into calcination process is preheated, it is not necessary to be additionally provided preheating chamber, only fill Point it is the chamber to form preheating using the screw elevator of Lifting Convey, not only saving space was simultaneously again for this energy of saving heat energy The Transition Technology reduced between process；

(3) present invention can to produced in paper-making process discarded object white clay, reclaim the residual alkali water that separates during white clay The sulfur-bearing carbon dioxide produced during solution, extraction sierozem power is respectively processed, and only discharges the gas after dust-removal and desulfurizing Body, Paris white or pulverized limestone or land plaster class solid can extract the original that Posterior circle is used or processed as other productions Material, the residual alkali aqueous solution that centrifugal dehydration is obtained can be used for desulfurization or be used into paper manufacturing process circuit, in whole recovery system Material or comprehensive utilization of energy, it is both economically and environmentally beneficial；

(4) the Paris white finished product produced in the present invention can be directly used as light cellular partition board inserts or other wallboard materials Material；

(5) protruding canine teeth is set in rotary calcining stove in the present invention, the white clay block of caking is broken up using mechanical structure, protruding canine teeth is to forging The white clay block repeated stock burnt in body of heater is smashed, so as to improve calcination efficiency, reduction energy resource consumption；

(6) revolution cooler high temperature sierozem power and cooling water not only effective heat exchange but also separating dry space from moist space in the present invention；

(7) directly the sierozem power after cooling is ground using grey calcium grader in the present invention, be classified, so that directly To the satisfactory finished product of particle diameter, so as to improve whole white clay recovery utilization rate.

Brief description of the drawings

Fig. 1 is master operation schematic diagram of the invention.

Fig. 2 is system structure diagram of the invention.

Fig. 3 is the timing diagram of one work period of centrifugal dehydrator in the present invention.

Fig. 4 is protruding canine teeth cross section in the present invention in the trapezoidal structural representation of class.

Fig. 5 is structural representation of the protruding canine teeth cross section in the present invention in class triangle.

Fig. 6 be in embodiment 2 in experiment two calcination time with after calcining in ashes calcium carbonate content graph of a relation.

Wherein：1st, white clay material box；2nd, the first screw elevator；3rd, centrifugal dehydrator；4th, screw elevator is calcined；5th, return Turn calcining furnace；53rd, protruding canine teeth；6th, desulfurizing tower；7th, cooler is turned round；8th, grey calcium grader；9th, finished product packing machine；10th, desulfurizing agent is matched somebody with somebody Case processed；11st, heat pipe.

Embodiment

The present invention is described in further detail with reference to embodiment, but the implementation of the present invention is not limited to this. It is to be appreciated that term " longitudinal direction ", " transverse direction ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", The orientation or position relationship of the instruction such as " top ", " bottom ", " interior ", " outer " are For the ease of the description present invention and simplified description, rather than indicate or imply that the device or element of meaning must be with specific sides Position, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.

Embodiment 1：

As shown in Figure 1 and Figure 2, white clay reclaims the energy saving and environment friendly recovery method of comprehensive utilization, including the white clay being sequentially connected Material box 1, centrifugal dehydrator 3, rotary calcining stove 5, revolution cooler 7, grey calcium grader 8, finished product packing machine 9, the revolution Calcining furnace 5 is also connected with flue and is connected by flue with desulfurizing tower 6.

The rotary calcining stove 5 includes setting the import of dehydration white clay, the outlet of high temperature ashes, the holding furnace of high-temperature flue gas outlet Body and rotary calcining stove 5 is obliquely installed；Its dehydration of the discharge end of centrifugal dehydrator 3 and rotary calcining stove 5 of output dehydration white clay is white Mud import is connected by calcining revolution elevator, and the high temperature ashes outlet of ashes is dried in output and revolution cooler 7 enters ashes The high-temperature flue gas outlet of flue gas is connected by flue with desulfurizing tower 6 in mouth connection, output calcination process.The revolution cooler 7 The heat pipe 11 of the unidirectional heat transfer of heat recovery is communicated between calcining screw elevator.The white clay material box 1 with from Connected between heart dewaterer 3 by the first screw elevator 2.

The predominating path that the recovery system extracts sierozem power from white clay is：White clay raw material → white clay material box 1 → from The heart 3 → rotary calcining of dewaterer stove 5 → revolution cooler 7 → ash calcium 8 → finished product packing of grader, 9 → Paris white of machine finished product or Pulverized limestone finished product.

Generated in its white clay removal process of the recovery system gas circulation predominating path be：Produced in rotary calcining stove 5 Carbon dioxide → flue → desulfurizing tower 6 → of raw sulfur-bearing is discharged in air.

Separated in its white clay removal process of the recovery system liquid circulation predominating path be：Divide in centrifugal dehydrator 3 In the residual alkali aqueous solution → paper technology separated out or be passed through desulfurizing tower 6 be used for desulfurization.

In addition, white clay raw material can dilute after as desulfurizing agent, the desulfurization for sulfur-bearing carbon dioxide in desulfurizing tower 6 And dedusting.

The heat pipe 11 unidirectionally conducts heat from revolution cooler 7 to calcining screw elevator 4, and the evaporation ends of heat pipe 11 are positioned at cold But intracavitary and close to outlet pipe one end, the condensation end of heat pipe is located at the calcining spiral between centrifugal dehydrator 3 and rotary calcining stove 5 In elevator 4.The closing of the inside of the heat pipe 11, do not connect with external.It will be turned round in cooler 7 more than heat exchange by heat pipe 11 Heat transfer is carried out pre- to calcining in screw elevator 4 to the dehydration white clay being not yet dehydrated completely discharged from centrifugal dehydrator 3 Dry.

The inwall of the calcining body of heater sets some protruding canine teeth 53；The protruding canine teeth 53 is higher than the flange of calcining inboard wall of furnace body. The flange is lower end close to one end of calcining inboard wall of furnace body, and small lower big structure is presented in the cross section of flange.

The flange lower end is connected as one with calcining inboard wall of furnace body：When it is cylinder type cavity to calcine body of heater, so The bottom profiled of flange cross-sectional actually circular arc；When it is square-column-shaped cavity to calcine body of heater, so the bottom profiled of flange cross-sectional is real For straight line.When it is cylinder type cavity to calcine body of heater：As shown in figure 4, flange cross-sectional is in the class ladder that upper end is small, lower end is big Shape；Or, as shown in figure 5, flange cross-sectional is in the class triangle that upper end is small, lower end is big.Moreover, the lower end of the flange is with forging Burn inboard wall of furnace body rounding off.

The revolution cooler 7 include setting the cooling body of afterheat return mouthful, it is interior be enclosed in cooler body and with cooling Revolving drum, the cold water spray device in cooling chamber of body formation cooling chamber.

The revolving drum formation one only opens up the import of high temperature sierozem power, the cylindrical cavity of low temperature sierozem power outlet.And And, revolving drum can be rotated under drive device effect along its axis.Drive device herein can be using motor output End is installed by the structure of the driving tooth engaged with revolution drum outer wall.

In the present embodiment, the cooling water of high temperature sierozem power and low temperature only carries out heat exchange without directly connecing in revolution barrel Touch, separating dry space from moist space, be easy to sierozem power to remain in that drying regime enters ash charge calcium grader 8 and carries out powder mull, classification after cooling.

Desulfurizing agent is additionally provided between the white clay material box 1 and desulfurizing tower 6 and prepares case 10；The desulfurizing agent prepares case 10 It is provided with the white clay feed(raw material)inlet that is connected with white clay material box 1 by raw material supply pump, external dilution white clay raw material liquid Dilution import, the desulfurizing agent incidence channel by the white clay mud of dilution downward penetrating desulfurizing tower 6 above desulfurizing tower 6；It is described One desulfurizing agent transfer pump is installed in desulfurizing agent incidence channel.

The in the market of desulfurizing tower 6 is directly purchased.It is to be passed through desulfurizing tower 6 using white clay raw material as desulfurizing agent in the present embodiment In.

According to detection, its main component of white clay that paper mill is reclaimed is CaCO₃, NaOH, CaCO₃Content is 80%-92%.Its In, CaCO₃Particle diameter accounts for more than the 90% of its total amount, desulphurizing activated preferable, the promotion containing desulfurization simultaneously again below 45 μm Composition Na2O, MgO etc., fully achieve more than 90% flue gas desulphuization rate, and white clay converts in flue gas desulfurization course For gypsum, with certain economic use value.It therefore, it can while solving the solid and gas two big discarded object in paper mill Process problem, reaches the treatment of wastes with processes of wastes against one another, the purpose of cost efficiency.

Using white clay raw material carry out desulfurization technological process be：White clay raw material and dilution are prepared into case 10 in desulfurizing agent In, the suspension of calcium carbonate concentration 20~25% is configured under normal temperature bar, then using this suspension as desulfurizing agent from desulfurizing tower 6 Middle and upper part is sprayed into desulfurizing tower 6, and descending desulfurizing agent is mixed and reaction desulfuration with up flue gas adverse current.

The dilution can be extraneous water supply, or the residual alkali aqueous solution that centrifugal dehydrator 3 is isolated.

On the one hand, if only being sprayed from the top down with the aqueous solution in desulfurizing tower 6, dust-laying effect can with but desulfurized effect one As；If being sprayed from the top down as desulfurizing agent using the residual alkali aqueous solution isolated in desulfurizing tower 6, dust-laying effect and desulfurized effect are all It is medium；And using the suspension of white clay raw material dilution to be sprayed from the top down as desulfurizing agent, dust-laying effect and desulfurized effect are all very It is good.

On the other hand, the top of desulfurizing tower 6 and its top set multi-layer high-temperature dustcloth, to being arranged from the top of desulfurizing tower 6 to big The gas of gas carries out the obstruction of particulate matter in flue gas, so as to improve dust removing effects.

Embodiment 2：

The present embodiment stresses recovery method.

As shown in figure 1, white clay reclaims the band after the energy saving and environment friendly recovery method of comprehensive utilization, the causticization that papermaking is produced Residual alkali white clay carries out dewaterer dehydration, calcining furnace calcining successively, cooler is cooled down, finished product is made in grey calcium machine grinding sorting.It is described The sulfur-containing smoke gas produced in calcining furnace calcination process is passed through desulfurizing tower and carries out desulfurization；The calcining furnace is obliquely installed for calcining body of heater Electrothermal rotary calcining stove, calcining body of heater sets dehydration white clay import, the outlet of high temperature ashes, high-temperature flue gas outlet.

The dehydration white clay is with 5-6kg/m3min flows from the dehydration white clay import positioned at the higher tail end of calcining body of heater Into rotary calcining stove, the calcining body of heater that 3 ° ± 0.1 ° and inwall setting protruding canine teeth are rotated, tilted with 1-5r/min is slow transitted through, The fully calcined of 15-30min is carried out with 260 DEG C -1200 DEG C of calcining heat in calcining furnace body, the ashes after calcining is from positioned at forging High temperature ashes outlet delivery to the cooler for burning the relatively low head end of body of heater is cooled down；The sulfur-containing smoke gas produced in the calcination process from High-temperature flue gas outlet positioned at calcining body of heater tail end by flue is passed through desulfurizing tower.

First, 260 DEG C -1200 DEG C of calcining heat is that the product that is made as needed is different and selected.Different The product that calcining heat section is ultimately generated is different.

In the calcining furnace calcination process, by controlling the main component of ashes after calcining heat control calcining, it is specifically Refer to：

Secondly, dehydration white clay is with 5-6kg/m³Min flows enter calcining body of heater, 3 ° ± 0.1 ° of tilting furnace of calcining and set Put, rotated using 1-5r/min, calcination time as 15-30min, these parameters are complementary to the effect of calcining.

The excessive velocities that the calcining body of heater is rotated using powerful device, it is necessary to be driven and without other obvious benefits Place；Calcining body of heater velocity of rotation is excessively slow, and white clay flowing velocity is excessively slow, is unfavorable for occurring to hit and the group of breaing up by particle flow Block；More importantly, the speed rotated by calcining body of heater can adjust holdup time of the white clay in calcining chamber (during calcining Between).

The angle of inclination of the calcining body of heater is also for being easy to white clay freely transmitting and ensure in calcining chamber Holdup time of the white clay in calcining chamber.

The calcination time influences maximum to ashes quality after calcining, and calcination time length, calcining are abundant, in ashes it is main into Divide content higher, but the energy of consumption is more；Calcination time is short, calcining is not abundant enough, the consumption energy is less, but main in ashes Want component content lower slightly.

Applicant by several groups of experiments to calcining when technological parameter study, and pass through the detection means pair such as XRD, SEM The ashes cooled down after calcining is detected.

(1) one is tested：Use the calcining a diameter of 2.5m of body of heater and calcining furnace body length calcines revolution for 19m electrothermal Stove (calcining rotary furnace model Φ 2.5-19m), is calcined with 260 DEG C, is only dehydrated the flow difference that white clay enters calcining body of heater, Other conditions are identical, and its calcining situation is shown in Table 1：

Table 1

To under above-mentioned three groups of Parameter Conditions, ashes carries out sample detecting after calcining, every group of parameter takes 10 data, obtains each The ashes principal component content situation from after calcining.

From table 1 it follows that in A1 groups, when the dehydration white clay flow for entering calcining rotary furnace is excessive, because calcining Oxygen depletion rate, heat deployment conditions etc. influence in environment, the dehydration white clay meeting still containing a small amount of moisture and other impurities Caking, balling, and situation it is more serious when caking, calcining inboard wall of furnace body, influence subsequent calcination effect can be also sticked to after balling Really, the reduction of calcined product quality is caused.If calcining situations such as inboard wall of furnace body bonds a large amount of agglomerates, it is necessary to which workman enters from manhole Row roots out operation, or sets scraper plate regularly to be struck off processing in calcining inboard wall of furnace body.Certain scraper plate can be used for pushing away The input and output of material (dehydration white clay) in dynamic calcining chamber, to control to calcine during the delay of material (dehydration white clay) in chamber Between.On the other hand, in A3 groups, when the dehydration white clay flow for entering calcining rotary furnace is less, calcining chamber indoor oxygen fully, Heat is scattered fast, and dehydration white clay does not lump typically, and impurity reaction is more abundant and there is a situation where to separate with ashes in gaseous form, The content of calcium carbonate is high in ashes after the content of calcium carbonate in A2 groups than calcining in ashes after calcining.But, A3 groups compare Calcium carbonate content improve only a little in ashes after the calcining of A2 groups, and yield difference is farther out.It is white in calcination process in A2 groups Mud can produce a small amount of caking phenomenon, but because also set broken knot in calcining inboard wall of furnace body in the technical scheme of the invention Block, the protruding canine teeth of conglomeration, at the same coordinate calcining body of heater rotation and drive white clay mutually hit and white clay and protruding canine teeth shock, one The white clay of aspect caking can seldom be adhered to and ring formation in calcining inboard wall of furnace body, and another aspect white clay caking is easy to be broken up.

To sum up, use the calcining a diameter of 2.5m of body of heater and calcining furnace body length (is calcined for 19m electrothermal calcining rotary furnace Rotary furnace model Φ 2.5-19m), calcined with 260 DEG C, when 3 ° of calcining body of heater inclination angle, calcining body of heater rotating speed 3r/min, calcining Between 15min, dehydration white clay by 500kg/min flows enter this calcining rotary furnace parameter under (be substantially identical to 5.36kg/m³· Min), in calcination process lump situation it is controllable and calcining after ashes quality meet basic demand.

Further, by A2 group processing parameters, calcining rotary furnace has a daily output of 240 tons.

(2) two are tested：Use the calcining a diameter of 2.5m of body of heater and calcining furnace body length calcines revolution for 19m electrothermal Stove (calcining rotary furnace model Φ 2.5-19m), is calcined with 260 DEG C, is only dehydrated burning of lime sludge time difference, other conditions phase Together, its calcining situation is shown in Table 2 and accompanying drawing 6：

Table 2

To under above-mentioned eight groups of Parameter Conditions, ashes carries out sample detecting after calcining, every group of parameter takes 10 data and asks it Average, ashes principal component content situation after each being calcined.

From two tables 2 of experiment and accompanying drawing 6 (graph of a relation of calcination time and calcium carbonate content in ashes after calcining in experiment two) Data from the point of view of, calcination time increase, be conducive to increase ashes in calcium carbonate content, but with 260 DEG C be made with carbonic acid In the scheme of byproduct based on calcium, calcination time is controlled in more than 12min, you can ensure calcium carbonate more than 80% in ashes, But with the continuation increase of calcination time, calcium carbonate content speedup eases up.Therefore, consider ashes quality and energy consumption etc. because Calcination time control is that can effectively ensure that calcium carbonate more than 80% in ashes in 15min or so (14-16min) in element, this technique.

Summary content, when white clay extracts the product using calcium carbonate as main component from paper technology, calcine technology Middle 260 DEG C of use calcining heat, 3 ° of calcining body of heater inclination angle, calcining body of heater rotating speed 3r/min, calcination time 15min, dehydration white clay Enter inbound traffics 5-6kg/m³Min technological parameter, calcine calcium carbonate mass fraction in obtained ashes ensure more than 80% and Retain the active high calcium oxide produced in causticization process, and energy consumption can be effectively controlled, overall economic efficiency highest.

(3) three are tested：Use the calcining a diameter of 2.5m of body of heater and calcining furnace body length calcines revolution for 19m electrothermal Stove (calcining rotary furnace model Φ 2.5-19m), is calcined with 800 DEG C, 900 DEG C, 1000 DEG C, 1100 DEG C, 1200 DEG C respectively, its His condition is identical, and its calcining situation is shown in Table 3：

Table 3

To under above-mentioned 5 groups of Parameter Conditions, ashes carries out sample detecting after calcining, every group of parameter takes 10 data averagings Value, ashes principal component content situation after each being calcined.Temperature is too high, calcination time is long, can all cause calcium oxide activity Reduction.

Accordingly, it would be desirable to when preparing the finished product of calcium oxide content more than 98%, calcine technology：1100 DEG C of calcining heat, calcining 3 ° of body of heater inclination angle, calcining body of heater rotating speed 3r/min, calcination time 15min, dehydration white clay enter inbound traffics 5-6kg/m³·min。

Calcine technology is：800 DEG C of calcining heat, 3 ° of calcining body of heater inclination angle, calcining body of heater rotating speed 3r/min, calcination time 15min, dehydration white clay enter inbound traffics 5-6kg/m³Min, can prepare the finished product sierozem power of calcium oxide content more than 50%.

Calcine technology is：1000 DEG C of calcining heat, 3 ° of calcining body of heater inclination angle, calcining body of heater rotating speed 3r/min, calcination time 15min, dehydration white clay enter inbound traffics 5-6kg/m³Min, can prepare the finished product sierozem power of calcium oxide content more than 75%.

The other parts of the present embodiment are same as Example 1, therefore repeat no more.

Embodiment 3：

The present embodiment further optimizes on the basis of embodiment 1 or 2, and the protruding canine teeth calcines inboard wall of furnace body simultaneously to be arranged on Its regularity of distribution of some protruding canine teeth and single protruding canine teeth of wall distribution in the convex portion prominent to calcining body of heater center light cunning, calcining furnace body Size meets following condition：Tail end from calcining body of heater is to head end, and the distributions of a plurality of protruding canine teeth is by dredging gradually close and single protruding canine teeth Size is by gradually small greatly.

In the present embodiment, the design of protruding canine teeth meets calcination process of the dehydration white clay in calcining chamber.Although with residual alkali White clay raw material first passes through dehydration, again by preheating, but enters when calcining chamber is calcined still containing the moisture less than 10%, dehydration White clay still has conglomeration, the situation of caking in itself, and feeding end conglomeration, the volume lumpd are larger, with the increase of calcination time, water Point slowly evaporation, moieties decompose, impinged upon one another between agglomerate or agglomerate and calcining furnace body wall face, conglomeration, caking Volume diminishes.So, in the present embodiment, for the change of material in dehydration lime reburning process, rationally design protruding canine teeth structure, fills Divide and utilize physical shock, break up agglomerate, improve calcination efficiency.

The other parts of the present embodiment are identical with embodiment 1 or 2, therefore repeat no more.

Embodiment 4：

The present embodiment further optimizes on the basis of embodiment any one of 1-3, is used in the dewaterer dehydration Dewaterer be built-in concentrator bowl, frequency converter, the centrifugal dehydrator for centrifuging motor, concentrator bowl by can rotating Frequency Converter Control Centrifugation motor driving, wherein with concentrator bowl rotate clockwise for rotate forward, concentrator bowl rotate counterclockwise for reversion.

In the dewaterer dehydration, the rotating speed of concentrator bowl is in cyclically-varying.As shown in figure 3, one week during dehydration Phase refers to：Concentrator bowl rotates forward (O points are the starting point of a cycle) since rotating speed is 0 rev/min, is first linearly carried in 5-15 seconds Speed is to 650 revs/min (A points) and continues to rotate forward 1 minute (B points), is then decelerated to naturally 0 rev/min (C points), stalls 0-10 Start to invert (D points) after second, linear speed-raising is to 650 revs/min (E points) in 5-15 seconds and continues to invert 1 minute (F points), then Naturally it is decelerated to 0 rev/min (G points), stalls 10-30 seconds (H points), a spin cycle terminates.Pressed with a collection of band residual alkali white clay This loop cycle is reciprocal 4-6 times.

In the present embodiment, by the way of the concentrator bowl periodicity rotating of dehydration, dewatering efficiency is improved, by above-mentioned de- Water mode, dehydration rate at least seventy percent.On the other hand, most fast rotating speed is designed as 600-700 revs/min.Rotating speed is improved, the same terms Lower dehydrating effect can be more preferable, but energy consumption also substantially increases.By many experiments, in the invention, to band residual alkali white clay with The effect that 600-700 revs/min of maximum speed carries out centrifugal dehydration can meet needs of production, and energy consumption is relatively It is low, it is not required that the motor of configuration super high power, it can effectively control cost, overall economic efficiency highest.

Further, first spin cycle, second spin cycle also intermittence are passed through raw water during the dewaterer dehydration, I.e.：Start a cycle of dewatering work and during second period, when concentrator bowl forward or reverse speed less than 100 turns/ During minute, it is passed through from what cooler was drawn and occurs the high temperature raw water after heat exchange to ashes progress water cooling after high-temperature calcination, profit Dealkalize is rinsed to band residual alkali white clay with high temperature raw water.

In the present embodiment, dehydration is carried out by the way of 4-6 cycle is repeated, in a cycle, second period, It is passed through raw water and treats residual alkali white clay and be rinsed, solable matter, especially alkaline matter (NaOH etc.) is further removed, after being Sequence process is ready.Moreover, in the present embodiment, the high-temperature water after heat exchange in refrigerating work procedure directly is passed through into concentrator bowl is used for Rinse, on the one hand, solubility is higher when temperature is higher；On the other hand, without external water source, cooling water is recycled, energy-conservation subtracts Row.Raw water after the cooling of high temperature raw water can also be directly used in the flushing with residual alkali white clay in dehydration procedure, and simply effect can compare High temperature raw water is slightly a little bit poorer, but can receive.

In dehydration, high temperature raw water or raw water are rinsed after obtaining being separated by concentrator bowl after residual alkali white clay, are formed residual Alkali lye.Residual alkali liquid can be with direct reuse to paper technology.Residual alkali liquid is also used as preparing the dilution of desulfurizing agent.

Experiment proves that its desulfurized effect is optimal for 22%-24% desulfurizing agent for white clay concentration.

The other parts of the present embodiment are identical with any one of embodiment 1-3, therefore repeat no more.

Embodiment 5：

The present embodiment further optimizes on the basis of embodiment any one of 1-4, and white clay reclaims the energy-saving ring of comprehensive utilization Guarantor's type recovery method, including the white clay material box 1, the first screw elevator 2, centrifugal dehydrator 3, the calcining spiral that are sequentially connected are carried Machine 4, rotary calcining stove 5, revolution cooler 7, grey calcium grader 8, finished product packing machine 9 are risen, the rotary calcining stove 5 is also connected with cigarette Road is simultaneously connected by flue with desulfurizing tower 6.

The inwall of the calcining body of heater sets some protruding canine teeth 53；The protruding canine teeth 53 is higher than the flange of calcining inboard wall of furnace body. The flange is lower end close to one end of calcining inboard wall of furnace body, and small lower big structure, and the lower end of flange are presented in the cross section of flange With calcining inboard wall of furnace body rounding off.

The heat pipe of the unidirectional heat transfer of heat recovery is communicated between the revolution cooler 7 calcining screw elevator 4 11.The cooling chamber of the one end of heat pipe 11 connection revolution cooler 7, the other end connection calcining screw elevator 4 of heat pipe 11 First half term.The residual heat stream of cooling water and high temperature sierozem power heat exchange is gone to calcining screw elevator 4 inner chamber simultaneously by the heat pipe 11 Preheating is dried to the dehydration white clay of entrance.

The revolution cooler 7 include setting the cooling body of afterheat return mouthful, it is interior be enclosed in cooler body and with cooling Revolving drum, the cold water spray device in cooling chamber of body formation cooling chamber；

The recovery system of the present invention also includes electric control chamber, and the work of whole recovery system is controlled by center in electric control chamber Device carry out in unified Automated condtrol, electric control chamber central controller respectively with the first screw elevator 2, centrifugal dehydrator 3, forge Burn in screw elevator 4, rotary calcining stove 5, desulfurizing tower 6, revolution cooler 7, grey calcium grader 8, finished product packing machine 9 and control member Part connection is automatically controlled.In the present embodiment control system be highly developed prior art, and the present invention improvement simultaneously This is not lain in, therefore is repeated no more.

The other parts of the present embodiment are identical with any one of embodiment 1-4, therefore repeat no more.

Embodiment 6：

Centrifugal dehydrator in embodiment 1 is replaced with into strong extruding-desiccation machine in the present embodiment.Centrifugal dehydrator, strong extruding are de- Water dispenser is existing commercially available prod, and the present invention is carried out at the dehydration of white clay raw material only with centrifugal dehydrator or strong extruding-desiccation machine Reason, improvement of the invention does not lie in centrifugal dehydrator, strong extruding-desiccation machine in itself, therefore to its internal structure, operation principle etc. Do not repeating.The other parts of the present embodiment are same as Example 1, therefore repeat no more.

Embodiment 7：

According to embodiment 6, the step of recovery process is carried out including next coming in order in the present embodiment：

Step S1：The white clay produced in paper production is first stored precipitate and stand into white clay material box after be layered；

Step S2：Remove the solid-liquid point for realizing dehydration white clay and the residual alkali aqueous solution through strong extrusion dehydration with residual alkali white clay of layer From；

Step S3：It is dehydrated white clay to enter the high-temperature calcination of rotary calcining stove, crush, output high temperature sierozem power and sulfur-containing smoke gas；

Step S4：Sulfur-containing smoke gas enters desulfurizing tower by flue and carries out desulfurization heel row to air, while high temperature sierozem power enters Enter to turn round cooler cooling；

Step S5：Sierozem power enters the further dry powder grinding of ash charge calcium grader, classification after cooling；

Step S6：Sierozem power enters finished product packing machine class wrapping after classification.

In the step S4, by the residual alkali aqueous solution in band residual alkali white clay, step S2 in white clay material box in step S1 simultaneously It is passed through in desulfurizing agent configuration case, is mixed to form the suspension that white clay concentration is 22-24%, suspension is as desulfurizing agent to desulfurizing tower The sulfur contained high temoperature flue gas of bottom ascending motion carries out desulfurization.

Wherein, in the step S3 rotary calcining stove by electric heater unit by high-temperature calcination office work temperature adjustment extremely At 255 DEG C -310 DEG C, sierozem power is based on calcium carbonate in final step S5, and the Paris white produced can be directly used for light partition wall Plate inserts or other wall board materials.

Calcining heat is controlled at 260 DEG C, and Paris white mass percent accounts for more than 80% in sierozem power.

In the step S3 rotary calcining stove by electric heater unit by high-temperature calcination office work temperature adjustment to 800 At DEG C -1000 DEG C, sierozem power is using Paris white and calcium oxide powder as the mixed powder of major ingredient after being calcined in final step S5.It is logical Control calcining heat is crossed, the mass percent of Paris white or calcium oxide powder is can adjust.

In the step S3 rotary calcining stove by electric heater unit by high-temperature calcination office work temperature adjustment to 1100 At DEG C -1200 DEG C, sierozem power is based on lime in final step S5.

Calcining heat is controlled at 1100 DEG C, and calcium oxide powder mass percent accounts for more than 98% in sierozem power.

It is described above, be only presently preferred embodiments of the present invention, any formal limitation not done to the present invention, it is every according to According to the present invention technical spirit above example is made any simple modification, equivalent variations, each fall within the present invention protection Within the scope of.

Claims

1. white clay reclaims the band residual alkali white clay after the energy saving and environment friendly recovery method of comprehensive utilization, the causticization that papermaking is produced successively Carry out dewaterer dehydration, calcining furnace calcining, cooler is cooled down, finished product is made in grey calcium machine grinding sorting, the calcining furnace is calcined The sulfur-containing smoke gas produced in journey is passed through desulfurizing tower and carries out desulfurization；The electrothermal revolution that the calcining furnace is obliquely installed for calcining body of heater Calcining furnace, calcining body of heater sets the import of dehydration white clay, the outlet of high temperature ashes, high-temperature flue gas outlet；It is characterized in that：

Only connected between the dewaterer discharge end and calcining furnace feed end by calcining screw elevator, the cooler cooling During the dehydration white clay discharged to it of the waste heat that produces discharge end that dewaterer is back to by the heat pipe of one-way transmission carry out One-level is preheated, while the high-temperature gas of calcining enters to the dehydration white clay for entering calcining furnace from calcining screw elevator in calcining furnace Two grades of preheatings of row so that formed in the calcining screw elevator by dewaterer discharge end to its preheating temperature of calcining furnace feed end Uniform elevated preheating cavity, dehydration white clay is directly entered calcining after completing preheating during calcining screw elevator screw lifting Stove is calcined；

The dehydration white clay is with 5-6kg/m³Min flows enter from the dehydration white clay import positioned at the higher tail end of calcining body of heater Rotary calcining stove, slow transits through the calcining body of heater that 3 ° ± 0.1 ° and inwall setting protruding canine teeth are rotated, tilted with 1-5r/min, in calcining The fully calcined of 15-30min is carried out with 255 DEG C -1210 DEG C of calcining heat in body of heater, the ashes after calcining is from positioned at calcining furnace The high temperature ashes outlet delivery of the relatively low head end of body to cooler is cooled down；The sulfur-containing smoke gas produced in the calcination process from positioned at The high-temperature flue gas outlet of calcining body of heater tail end is passed through desulfurizing tower by flue.

2. white clay according to claim 1 reclaims the energy saving and environment friendly recovery method of comprehensive utilization, it is characterised in that：It is described In calcining furnace calcination process, by controlling the main component of ashes after calcining heat control calcining, specifically refer to：

Calcining heat is controlled to 800 DEG C -1000 DEG C ashes being made using the mixture of calcium carbonate and calcium oxide as main component；

3. white clay according to claim 2 reclaims the energy saving and environment friendly recovery method of comprehensive utilization, it is characterised in that：It is described In calcining furnace calcination process, control calcining heat is to 260 DEG C and causes calcining white clay to be detained more than 15min, carbonic acid is made calcareous Amount is than the ashes not less than 80%.

4. white clay according to claim 2 reclaims the energy saving and environment friendly recovery method of comprehensive utilization, it is characterised in that：It is described In calcining furnace calcination process, control calcining heat is to 800 DEG C and causes calcining white clay to be detained more than 15min, oxidation is made calcareous Amount is than the ashes not less than 50%.

5. white clay according to claim 2 reclaims the energy saving and environment friendly recovery method of comprehensive utilization, it is characterised in that：It is described In calcining furnace calcination process, control calcining heat is to 1000 DEG C and causes calcining white clay to be detained more than 15min, oxidation is made calcareous Amount is than the ashes not less than 75%.

6. white clay according to claim 2 reclaims the energy saving and environment friendly recovery method of comprehensive utilization, it is characterised in that：It is described In calcining furnace calcination process, control calcining heat is to 1100 DEG C and causes calcining white clay to be detained more than 15min, oxidation is made calcareous Amount is than the ashes not less than 98%.

7. the white clay according to claim any one of 1-6 reclaims the energy saving and environment friendly recovery method of comprehensive utilization, its feature It is：The protruding canine teeth is to be arranged on calcining inboard wall of furnace body and the convex portion prominent to calcining body of heater center light cunning, calcines inboard wall of furnace body Its regularity of distribution of some protruding canine teeth of EDS maps and single protruding canine teeth size meet following condition：From calcining body of heater tail end to head end, The distribution of a plurality of protruding canine teeth is by dredging the size of gradually close and single protruding canine teeth by gradually small greatly.

8. the white clay according to claim any one of 1-6 reclaims the energy saving and environment friendly recovery method of comprehensive utilization, its feature It is：The dewaterer used in the dewaterer dehydration is built-in concentrator bowl, frequency converter, centrifugation motor, clutch, rotating speed The centrifugal dehydrator of sensor, centrifugal dehydrator also sets up dehydration controller, and dehydration controller centrifuges electricity by Frequency Converter Control The rotating change of machine and rotational speed regulation, at the same be dehydrated controller control clutch connection/disengagement, by centrifugation motor by from Clutch drives concentrator bowl action；Wherein, concentrator bowl is rotated clockwise to rotate forward, concentrator bowl is rotated counterclockwise as reversion；

In the dewaterer dehydration, the rotating speed of concentrator bowl is in cyclically-varying, is specifically referred to：In a cycle, concentrator bowl Rotated forward since rotating speed is 0 rev/min, first linearly raised speed in 5-15 seconds to 600-700 revs/min and continue to rotate forward 1 minute, Then 0 rev/min is decelerated to naturally, stalling starts reversion after 0-10 seconds, linearly raised speed in 5-15 seconds to 600-700 revs/min Clock simultaneously continues reversion 1 minute, then is decelerated to 0 rev/min naturally, stalling 10-30 seconds, and a cycle terminates；With a collection of band residual alkali White clay is reciprocal 4-6 times by this loop cycle, i.e., same batch of material completes dehydration by 4-6 spin cycle.

9. white clay according to claim 8 reclaims the energy saving and environment friendly recovery method of comprehensive utilization, it is characterised in that：It is described First spin cycle, second spin cycle also intermittence are passed through raw water when dewaterer is dehydrated, and specifically refer to：Start to be dehydrated work The a cycle made and during second period, when the speed of concentrator bowl forward or reverse is less than 100 revs/min, be passed through from What cooler was drawn carries out water cooling to ashes after high-temperature calcination and occurs the high temperature raw water after heat exchange, using high temperature raw water to band Residual alkali white clay is rinsed dealkalize.

10. the white clay according to claim any one of 1-6 reclaims the energy saving and environment friendly recovery method of comprehensive utilization, its feature It is：The residual alkali liquid isolated in the dewaterer dehydration from residual alkali white clay is directly reclaimed is used for paper maker to circulate Skill；Or, the residual alkali liquid isolated in the dewaterer dehydration from residual alkali white clay is first introduced into temporary storage barrel and deposited, residual Alkali lye, will be de- by desulfurizing agent transfer pump with forming the desulfurizing agent that white clay concentration is 22%-24% after being mixed with residual alkali white clay raw material Sulphur agent sprays into desulfurizing tower above desulfurizing tower and carries out desulfurization process to sulfur-containing smoke gas.