CN103466573A - Energy-saving method for preparing yellow phosphorus from low-quality phosphate ore - Google Patents
Energy-saving method for preparing yellow phosphorus from low-quality phosphate ore Download PDFInfo
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- CN103466573A CN103466573A CN201310417284XA CN201310417284A CN103466573A CN 103466573 A CN103466573 A CN 103466573A CN 201310417284X A CN201310417284X A CN 201310417284XA CN 201310417284 A CN201310417284 A CN 201310417284A CN 103466573 A CN103466573 A CN 103466573A
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- 238000000034 method Methods 0.000 title claims abstract description 64
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910019142 PO4 Inorganic materials 0.000 title abstract 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 title abstract 5
- 239000010452 phosphate Substances 0.000 title abstract 5
- 238000001354 calcination Methods 0.000 claims abstract description 95
- 238000001035 drying Methods 0.000 claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 claims abstract description 28
- 229910052698 phosphorus Inorganic materials 0.000 claims description 118
- 239000011574 phosphorus Substances 0.000 claims description 118
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 117
- 239000000843 powder Substances 0.000 claims description 81
- 239000002367 phosphate rock Substances 0.000 claims description 51
- 239000007789 gas Substances 0.000 claims description 26
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 21
- 239000003546 flue gas Substances 0.000 claims description 21
- 239000012530 fluid Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 3
- 238000005242 forging Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 11
- 238000005406 washing Methods 0.000 abstract description 9
- 239000012141 concentrate Substances 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 10
- 238000002203 pretreatment Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 4
- 238000010981 drying operation Methods 0.000 description 4
- 238000005243 fluidization Methods 0.000 description 4
- 238000006253 efflorescence Methods 0.000 description 3
- 206010037844 rash Diseases 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- -1 phosphorus compound Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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Abstract
The invention discloses an energy-saving method for preparing yellow phosphorus from low-quality phosphate ore. According to the method, phosphate ore with P2O5 content of less than 25% is taken as raw material, the drying process is carried out before the balling process in the production process, and the yellow phosphorus reduction production can be carried out after the balling process. The method overcomes the defects in the prior art, complies with the sustainable development policy of China, and comprises the steps of firstly, before baling, carrying out flash drying on wet concentrate after washing, carrying out dynamic calcination, namely, thoroughly burning the phosphate ore, then balling and carrying out reduction treatment to obtain the yellow phosphorus. The method is in accordance with the policies of energy conservation and emission reduction in China, is minimum in energy consumption and lowest in cost on the existing basis, utilizes the phosphate ore to the utmost extent, and solves the problems that the prior art is more in energy consumption and high in production cost, and is not in accordance with the policies of energy conservation and emission reduction in China.
Description
Technical field
The present invention relates to a kind of method for preparing yellow phosphorus, be specifically related to the power-economizing method that a kind of low-quality Rock Phosphate (72Min BPL) prepares yellow phosphorus.
Background technology
China's Rock Phosphate (72Min BPL) average grade world is minimum, 90% above Rock Phosphate (72Min BPL) grade is lower than 26%, average grade is only 16.85%, except the minority rich ore can be directly as producing phosphorus compound fertilizer and yellow phosphorus raw material, most of ore need could utilize through ore dressing, the ore dressing difficulty is large, and medium-sized and small enterprises are taked " adopting richness abandons poor " exploitation pattern mostly, cause phosphate rock resource to waste in a large number.
Phosphorus ore resource belongs to Nonrenewable resources, just progressively shows at present rare characteristic.Country has recognized Rock Phosphate (72Min BPL) importance, will disperse phosphate rock resource to concentrate to large-scale strong enterprises, requires low taste phosphorus ore is carried out to the washing utilization.
Current programme is that the wet concentrate after washing is directly carried out to balling-up, carries out drying, calcining feeding warehouse after balling-up.Thoroughly just can reach the calcining effect owing to the ball phosphorus ore of moulding will being grilled thoroughly at calcination process, and phosphorus ore ball extruding itself closely, in drying process, heat utilization efficiency is low, the energy consumption that therefore the phosphorus ore ball of moulding drying thoroughly will be needed will be very large, therefore wet concentrate is directly carried out to balling-up, allow refined ore closely cuddle up in a heap and carry out carrying out again the production of yellow phosphorus after drying treatment, do not meet the basic principle that national energy-saving reduces discharging.In addition, first balling-up this explained hereafter environment dry, calcining again is poor, and high to the requirement of tunnel furnace refractory material, the structure deteriorate rate is high, and impact is normally produced.
Summary of the invention
The present invention has overcome the deficiencies in the prior art, comply with the national sustainable development policy, provide a kind of, before balling-up, the wet ground phosphate rock that contains after washing or efflorescence pre-treatment has been carried out to flash drying, dynamic calcining first grills thoroughly phosphorus ore after balling-up the yellow phosphorus preparation method who carries out again reduction reaction in electric furnace, the method is first fully dried concentrate dry powder, the recompression balling-up, and by drying, the heat that calcination process produces is recycling in whole explained hereafter, the routine that is different from prior art prepares the yellow phosphorus order, meet national energy-saving and reduce discharging policy, reduce costs, accomplish to take full advantage of low-quality phosphorus ore resource, reduce energy consumption, accelerate China yellow phosphorus enterprise and realize that national energy-saving reduces discharging and the developing policy of low-carbon economy.
For achieving the above object, the present invention by the following technical solutions:
The power-economizing method that a kind of low-quality Rock Phosphate (72Min BPL) prepares yellow phosphorus comprises the following steps:
With P
2o
5the Rock Phosphate (72Min BPL) of content≤25% is raw material, before in production process, baking operation being placed on to the balling-up operation, carries out also original production of yellow phosphorus after balling-up.
Described baking operation is: by pretreated containing after wet ground phosphate rock flash drying, obtaining phosphorus ore dry powder, described phosphorus ore dry powder is calcined through calcination process again, described phosphorus ore dry powder enters the cooling phosphorus ore grog that becomes of heat exchange feed bin, and the heat of the tail gas that described calcination process produces is used as the drying source of flash drying and the drying source of calcination process after the cold fluid of interchanger absorbs.
Described phosphorus ore dry powder enters the cooling concrete steps that become the phosphorus ore grog of heat exchange feed bin: phosphorus ore dry powder enters the heat exchange feed bin, interchanger in the heat exchange feed bin and phosphorus ore dry powder carry out the matter heat exchange, phosphorus ore dry powder is cooled into as the phosphorus ore grog, the transfer of heat of phosphorus ore dry powder is to interchanger, the part heat passes to calcination process, and the part heat passes to flash drying and uses as thermal source.
Described flash drying is to adopt screw feeder to be conveyed into drying in moisture eliminator containing wet ground phosphate rock to obtain phosphorus ore dry powder, and with tornado dust collector, phosphorus ore dry powder is collected, described phosphorus ore dry powder is to carry out drying by passing into the drying source hot blast in moisture eliminator with the speed of 5-20m/s.
Described calcination process is the dynamic calcining operation: will after the phosphorus ore dry powder preheating obtained after flash drying, send in calcining furnace again, with the drying source in calcining furnace---high-temperature flue gas is mixed and moves upward, and the rapid dispersion effect moment matter heat exchange of the high-temperature flue gas of described phosphorus ore dry powder in calcining furnace makes the described phosphorus ore dry powder calcining temperature that is rapidly heated fully calcined.
The tail gas that calcining is produced drying source in flash drying and calcination process after interchanger is processed is used.
The tail gas that the thermal source of described preheating is produced by calcining provides after interchanger is processed.
Described balling-up step is: the phosphorus ore grog is conveyed in nodulizer continuously, adopts hydraulic pressure extruding balling-up to obtain finished product phosphorus ore ball.
In described flash drying, inlet temperature is 300 ℃-600 ℃, 550 ℃≤T of temperature out<100 ℃ or 100 ℃≤T<150 ℃ or 150 ℃≤T≤200 ℃.
Described calcining temperature is 700 ℃≤T<800 ℃ or 800 ℃≤T<900 ℃ or 900 ℃≤T<1100 ℃ or 1000 ℃≤T<1100 ℃ or 1100 ℃≤T<1150 ℃ or 1150 ℃≤T≤1200 ℃, and described phosphorus ore dry powder is 1-10s at the calcining residing time in furnace.
Compared with prior art, the invention has the beneficial effects as follows:
(1) the present invention first will be dried containing wet ground phosphate rock, and then carry out balling-up, because the phosphorus ore dry powder fallen apart is total
Much larger times of specific surface area after the surface area ratio balling-up, thereby can be dried by flash heat transfer, saved thorough drying time, and even the whole production technique time, meet energy-efficient scale operation aim, can avoid the wet concentrate by after washing of current programme directly to carry out balling-up, carry out the high energy consumption problem of the method generation of drying, calcining feeding warehouse after balling-up, also therefore calcining temperature is lower than conventional temperature, can not only calcine phosphorus ore dry powder, and reduces energy consumption.In a word, the transposing of the employing oven dry of the present invention's innovation, balling-up order is inconsistent with the production sequence of existing production yellow phosphorus, makes the heat utilization efficiency in production process improve, and takes full advantage of low-quality Rock Phosphate (72Min BPL), power consumption has at least reduced by 27%, and energy consumption has at least reduced by 32.14%.
(2) the present invention by low-quality Rock Phosphate (72Min BPL) through washing for entering totally-enclosed negative-pressure operation after becoming refined ore, high-temperature flue gas and finished ore dry powder can be mixed fully, and make finished ore dry powder and high-temperature flue gas moment matter heat exchange and calcine, guarantee that finished ore dry powder leaks outside without dust without underburnt, nothing without burning, make the rate of recovery of low-quality Rock Phosphate (72Min BPL) up to more than 99.5%, final CO
2clearance reaches 95%.
(3) pre-treating phosphorite pruinescence screw feeder is sent into the moisture eliminator inner drying in the mode of spiral, fully with hot blast, contacts, and can rapidly and efficiently utilize heat energy.
(4) phosphorus ore dry powder first carries out preheating and enters in calcining furnace again, can before entering calcining furnace, shorten and the temperature head of calcining furnace, and save the heating-up time and improve utilization efficiency of heat energy.
(5) in calcining furnace, selected phosphorus ore dry powder and High Temperature Gas are mixed and are the motion of eddy flow state, can enlarge its heating surface area by the selected phosphorus ore dry powder of rapid dispersion, conduct heat rapidly, reduce power consumption time and production technique time; Calcining waste heat and tail gas are admitted to the moisture eliminator recycle, have greatly saved the electric energy that need of production consumes.
(6) use of interchanger has strengthened heat exchange area especially, in drying and calcining process, makes whole flow process become an energy-efficient thermal energy supply system heat recycle exchanged, and meets the overall policy that national energy-saving reduces discharging.
Production technique of the present invention is consecutive production technique, constant product quality, the production environment of stopping property, particularly tail gas is repeated circulation and puts into flash drying, dynamic calcining technique, save energy, and exhaust emissions has greatly reached national requirements for environmental protection, to the environmental protection close friend;
The production technique of a whole set of flow setting moisture eliminator, calcining furnace, interchanger, a series of continuity array configurations of preheating has formed energy-efficient thermal energy supply system.
Embodiment
The present invention is further elaborated for the concrete embodiment of following basis.
But this should be interpreted as to the scope of the above-mentioned theme of the present invention only limits to following embodiment.
embodiment 1
With P
2o
524.59%, CaO 43.61%, SiO
29.7%, CO
210.86% Rock Phosphate (72Min BPL) is as raw ore, after raw ore is carried out to pre-treatment, different with prior art, first carries out baking operation, then carries out balling-up, and obtaining content is P
2o
529.80%, CaO 42.24%,, SiO
214.12%, CO
2<0.5% Rock Phosphate (72Min BPL), finally adopt the electric furnace reduction working system to obtain yellow phosphorus.
Select inferior Rock Phosphate (72Min BPL) to avoid as the phosphorus production raw material " adopting richness abandons poor " exploitation pattern that nowadays medium-sized and small enterprises are taked mostly, thereby Rational Utilization of Mineral Resources has been avoided a large amount of wastes of phosphate rock resource.
In addition, the existing yellow phosphorus method for preparing is all to adopt first balling-up to dry the mode restored again, owing in the balling-up process, can firmly pushing spheroid, and cause close-packed arrays between the phosphorus ore ball particle, have no space and can say, and the little specific surface area not as ground phosphate rock of specific surface area due to the phosphorus ore ball is large in drying process, conduct heat bad, thoroughly dry length consuming time, heat utilization efficiency is low on the one hand, thoroughly drying on the other hand the heat needed increases suddenly, in a word, the first balling-up of existing technique is dried this process characteristic again and has been caused following 2 problems:
1, dry and take lengthening, energy consumption strengthens;
2, production efficiency is low, does not also meet the scale operation aim of efficient energy-saving.
The present invention is directed to above-mentioned two problems, adopt the process sequence first dry balling-up again, will be in powdery
Phosphorus ore carries out drying, utilizes the specific surface area of its powdery to be far longer than the later specific surface area of balling-up, conducts heat rapidly, can reach fast calcining temperature thoroughly dries, energy efficient and time, the transposing temporary substitute factory of this process sequence subtracts energy while producing joint, meets energy-efficient scale operation aim.
The mode that pre-treatment can adopt washing or efflorescence to process is carried out.
embodiment 2
Similar with embodiment 1, be all the balling-up operation is placed on to baking operation after, difference is: embodiment 2 has adopted the mode of flash drying in baking operation, is specially:
With P
2o
524.59%, CaO 43.61%, SiO
29.7%, CO
210.86% Rock Phosphate (72Min BPL) is as raw ore, after raw ore is carried out to the efflorescence pre-treatment, obtain containing wet ground phosphate rock, with screw feeder, will send in moisture eliminator containing wet ground phosphate rock, the heat that utilizes calcining to produce tail gas after the cold fluid of interchanger absorbs as drying source---hot blast is used, hot blast be take the speed of 5-9m/s and will be obtained phosphorus ore dry powder in inlet temperature containing wet ground phosphate rock flash drying as 300-350 ℃ or 350-400 ℃, now dryer export place temperature out is 50≤T<100 ℃, phosphorus ore dry powder is collected fully with cyclonic separator and after carrying out preheating, put into calcining furnace, after calcining temperature is 700≤T<800 or 800≤T<900 or 900≤T<1000 ℃ calcining 1-10s, dedusting obtains the phosphorus ore grog, and gather up calcining tail gas.The preheating thermal source is provided after interchanger is processed by calcining tail gas, and the heat specifically obtained after interchanger is processed by calcining tail gas provides.
The phosphorus ore grog obtained by baking operation self has cementability, and by the phosphorus ore grog, with after hydraulic pressure extruding balling-up, obtaining content is P
2o
530.01%, CaO 42.04%,, SiO
213.81%, CO
2<0.5% phosphorus ore ball 120kg/, be directly used in yellow phosphorus electric furnace production using this Rock Phosphate (72Min BPL) as rich ore.
Using the screw feeder feeding, is by containing wetting, ground phosphate rock is screw type to add in moisture eliminator, allows and spreads out and fully contact with hot blast containing wet ground phosphate rock, increases heat transfer surface area, is conducive to like this improve drying efficiency, reduces and consumes energy.
The tail gas produced with calcining is used as the preheating thermal source after interchanger is processed, and need not expend like this electric power again and improve thermal source, thereby save power consumption.And the setting of preheating is in order in the calcination process process, to reach faster calcining temperature, thereby can more save phosphorus ore dry powder, calcine the thorough time.
embodiment 3
Similar with embodiment 2 steps, as different from Example 2, calcination process has adopted the dynamic calcining operation, is specially:
With P
2o
524.59%, CaO 43.61%, SiO
29.7%, CO
210.86% Rock Phosphate (72Min BPL) is as raw ore, after raw ore is carried out to the washing pre-treatment, obtain containing wet ground phosphate rock, with screw feeder, will send in moisture eliminator containing wet ground phosphate rock, the heat that utilizes calcining to produce tail gas after the cold fluid of interchanger absorbs as drying source---hot blast is used, hot blast be take the speed of 10-15m/s and the ground phosphate rock flash drying is obtained to phosphorus ore dry powder in inlet temperature as 400-450 ℃ or 450-500 ℃, now dryer export place temperature out is 100≤T<150 ℃, phosphorus ore dry powder is collected fully with cyclonic separator and after carrying out preheating, put into calcining furnace, drying source high-temperature flue gas during calcining in phosphorus ore dry powder and calcining furnace mixes, be and revolve fluidization and move upward, phosphorus ore dry powder has been increased the specific surface area of whole phosphorus ore dry powder significantly by the high-temperature flue gas rapid dispersion, therefore phosphorus ore dry powder and high-temperature flue gas energy moment are carried out the matter heat exchange, and phosphorus ore dry powder can reach the calcining temperature of 1000≤T<1100 ℃, phosphorus ore dry powder after calcining 1-10s is admitted to cyclonic separator and carries out gas solid separation, cooled phosphorus ore dry powder obtains the phosphorus ore grog through dedusting again, and gather up calcining tail gas.
Now phosphorus ore grog self has cementability, and the phosphorus ore grog is pushed to balling-up with hydraulic pressure, obtains finished product phosphorus ore ball 120kg/, and now phosphorus ore ball content is P
2o
531.32%, CaO 41.82%,, SiO
213.52%, CO
2<0.4% is directly used in yellow phosphorus electric furnace production using the phosphorus ore ball as rich ore.
After the heat of the tail gas produced with calcining is absorbed by the cold fluid in interchanger as the drying source in calcining furnace---high-temperature flue gas is used.During calcining, phosphorus ore dry powder and high-temperature flue gas are and revolve fluidization and move upward, this state of motion energy rapid dispersion phosphorus ore dry powder, thereby greatly increased the specific surface area of phosphorus ore dry powder, and then can conduct heat rapidly, phosphorus ore dry powder and high-temperature flue gas moment are carried out the matter heat exchange, phosphorus ore dry powder obtains fully calcined, process power consumption less consuming time is also few, and utilizes the tail gas of calcining generation to provide thermal source to be reused, and reaches energy-efficient purpose.
Adopt dynamic calcining of the present invention and because of the calcining be phosphorus ore dry powder, therefore phosphorus ore dry powder can fully obtain thorough drying in a short period of time, saved existing technique because of calcining be the time of drying more than the 30min that needs of phosphorus ore ball, greatly saved energy consumption and process time.Everyly relate to all carrying out for this purpose of this step.
embodiment 4
Similar with embodiment 3, difference is, the processing condition that embodiment 4 adopts and embodiment 3 are slightly different:
With P
2o
524.59%, CaO 43.61%, SiO
29.7%, CO
210.86% Rock Phosphate (72Min BPL) is as raw ore, raw ore is after the washing pre-treatment, obtain containing wet concentrate, will be containing wet concentrate in screw feeder be sent into moisture eliminator, the heat that utilizes calcining to produce tail gas after the cold fluid of interchanger absorbs as drying source---hot blast is used, hot blast be take the speed of 10-15m/s and will be obtained phosphorus ore dry powder in inlet temperature containing wet ground phosphate rock flash drying as 500-550 ℃ or 550-600 ℃, now dryer export place temperature out is 150≤T<200 ℃, phosphorus ore dry powder is collected fully with cyclonic separator and after carrying out preheating, put into calcining furnace, high-temperature flue gas in phosphorus ore dry powder and calcining furnace mixes, be and revolve fluidization and move upward, phosphorus ore dry powder has been increased the specific surface area of whole phosphorus ore dry powder greatly by the high-temperature flue gas rapid dispersion, therefore phosphorus ore dry powder and high-temperature flue gas energy moment are carried out the matter heat exchange, make phosphorus ore dry powder can reach the calcining temperature of 1100≤T<1150 ℃, phosphorus ore dry powder after calcining 1-10s enters cyclonic separator with the negative-pressure air-flow in calcining furnace and carries out gas solid separation.
Again the phosphorus ore dry powder of preorder gained is sent into to the heat exchange feed bin, cooling and cooling calcining heat of emitting is partly passed to calcination process by the interchanger heat exchange in the heat exchange feed bin, part is calcined heat and is passed to the flash drying operation and use as thermal source, the heat that simultaneously will calcine the tail gas produced after the cold fluid of interchanger absorbs as drying source---drying source of hot blast and calcination process---the high temperature flue gas drying use of flash drying operation.
Cooled phosphorus ore dry powder obtains the phosphorus ore grog through dedusting again, and gathers up calcining tail gas.After hydraulic pressure extruding balling-up, obtain finished product phosphorus ore ball 120kg/ again, its content is P
2o
531.53%, CaO 41.80%,, SiO
213.42%, CO
2<0.3%, this finished product phosphorus ore ball is directly used in to yellow phosphorus electric furnace production as rich ore.
Phosphorus ore dry powder after calcining is because temperature is higher, thereby it is cooling to enter the heat exchange feed bin, interchanger in the heat exchange feed bin and phosphorus ore dry powder carry out the matter heat exchange, the part heat passes to calcination process, the part heat passes to the flash drying operation and uses as thermal source, again be saved aspect power consumption like this, fully reach energy-conservation purpose.
embodiment 5
Similar with embodiment 4, difference is: the processing condition that embodiment 4 adopts and embodiment 5 are slightly different, are specially:
With P
2o
524.59%, CaO 43.61%, SiO
29.7%, CO
210.86% Rock Phosphate (72Min BPL) is as raw ore, by after the raw ore coal preparation, obtain containing wet ground phosphate rock, will be containing wet ground phosphate rock in screw feeder be sent into moisture eliminator, the heat that utilizes calcining to produce tail gas after the cold fluid of interchanger absorbs as drying source---hot blast is used, hot blast be take the speed of 15-20m/s and will be obtained phosphorus ore dry powder in inlet temperature containing wet ground phosphate rock flash drying as 300-350 ℃, now dryer export place temperature out is 180≤T≤200 ℃, phosphorus ore dry powder is collected fully with cyclonic separator and after carrying out preheating, put into calcining furnace, high-temperature flue gas in phosphorus ore dry powder and calcining furnace mixes, be and revolve fluidization and move upward, phosphorus ore dry powder has been increased the specific surface area of whole phosphorus ore dry powder greatly by the high-temperature flue gas rapid dispersion, therefore phosphorus ore dry powder and high-temperature flue gas energy moment are carried out the matter heat exchange, and phosphorus ore dry powder can reach the calcining temperature of 1150≤T≤1200 ℃, phosphorus ore dry powder after calcining 1-10s enters cyclonic separator with the negative-pressure air-flow in calcining furnace and carries out gas solid separation.
Again the phosphorus ore dry powder of preorder gained is sent into to the heat exchange feed bin, cooling and cooling part heat of emitting is passed to calcination process by the interchanger heat exchange in the heat exchange feed bin, the part heat passes to flash drying and uses as thermal source, and heat drying source---drying source of hot blast and the calcination process---high temperature flue gas drying as the flash drying operation after the cold fluid of interchanger absorbs that simultaneously will calcine the tail gas produced is used.
Cooled phosphorus ore dry powder obtains the phosphorus ore grog through dedusting again, then, after hydraulic pressure extruding balling-up, obtains finished product phosphorus ore ball 120kg/, and its content is P
2o
532.21%, CaO 41.71%,, SiO
213.35%, CO
2<0.3%, this finished product phosphorus ore ball is directly used in to yellow phosphorus electric furnace production as rich ore.
The cost-saving effect of the yellow phosphorus prepared by above-described embodiment reality in process of production is as shown in the table:
As can be seen from Table 1 and Table 2, the present invention's (adopt the ore deposit finish-drying that first will wet, calcining then ball processed carry out the production method of yellow phosphorus) and prior art (first adopt wet ore deposit ball processed again drying, calcine the method for carrying out phosphorus production) compare, power consumption is minimum has reduced by 27.02%, the ore deposit consumption is minimum has reduced by 31.69%, although ore deposit is expended with rising slightly to some extent, but power consumption takes consumption to be reduced a lot, and real cost has reduced at least 1330.8 yuan, realize the purpose that minimum energy consumption, least cost are produced yellow phosphorus.Adopt flash drying and dynamic calcining operation, can also further reduce energy consumption (power consumption reduces can reach 29.50%, and the ore deposit consumption reduces can reach 36.65%), enhance productivity, reduce phosphorus production cost (real cost has reduced by 1593.6 yuan).
Claims (10)
1. a low-quality Rock Phosphate (72Min BPL) prepares the power-economizing method of yellow phosphorus, comprises and drying and the balling-up operation, it is characterized in that: before in production process, baking operation being placed on to the balling-up operation, carry out also original production of yellow phosphorus after balling-up.
2. low-quality Rock Phosphate (72Min BPL) according to claim 1 prepares the power-economizing method of yellow phosphorus, it is characterized in that: described balling-up step is: the phosphorus ore grog is conveyed in nodulizer continuously, adopts hydraulic pressure extruding balling-up to obtain finished product phosphorus ore ball.
3. low-quality Rock Phosphate (72Min BPL) according to claim 1 prepares the power-economizing method of yellow phosphorus, it is characterized in that: described baking operation is: by pretreated containing after wet ground phosphate rock flash drying, obtaining phosphorus ore dry powder, described phosphorus ore dry powder is calcined through calcination process again, described phosphorus ore dry powder enters the cooling phosphorus ore grog that becomes of heat exchange feed bin, and the heat of the tail gas that described calcination process produces is used as the drying source of flash drying and the drying source of calcination process after the cold fluid of interchanger absorbs.
4. low-quality Rock Phosphate (72Min BPL) according to claim 3 prepares the power-economizing method of yellow phosphorus, it is characterized in that: described phosphorus ore dry powder enters the cooling concrete steps that become the phosphorus ore grog of heat exchange feed bin and is: phosphorus ore dry powder enters the heat exchange feed bin, interchanger in the heat exchange feed bin and phosphorus ore dry powder carry out the matter heat exchange, phosphorus ore dry powder is cooled into as the phosphorus ore grog, the transfer of heat of phosphorus ore dry powder is to interchanger, the part heat passes to calcination process, and the part heat passes to flash drying and uses as thermal source.
5. low-quality Rock Phosphate (72Min BPL) according to claim 3 prepares the power-economizing method of yellow phosphorus, it is characterized in that: described flash drying is to adopt screw feeder to be conveyed in moisture eliminator containing wet ground phosphate rock, drying thermal source drying obtains phosphorus ore dry powder, and with tornado dust collector, phosphorus ore dry powder is collected.
6. low-quality Rock Phosphate (72Min BPL) according to claim 5 prepares the power-economizing method of yellow phosphorus, it is characterized in that: the drying source of described flash drying is the hot blast passed in moisture eliminator, and the speed of described hot blast is 5-20m/s.
7. low-quality Rock Phosphate (72Min BPL) according to claim 3 prepares the power-economizing method of yellow phosphorus, it is characterized in that: described calcination process is the dynamic calcining operation: will after the phosphorus ore dry powder preheating obtained after flash drying, send in calcining furnace again, the tail gas produced by calcining becomes the drying source of high-temperature flue gas as forging process after the cold fluid of interchanger absorbs, the phosphorus ore dry powder that obtains after flash drying and high-temperature flue gas are mixed and move upward, the rapid dispersion effect moment matter heat exchange of the high-temperature flue gas of described phosphorus ore dry powder in calcining furnace makes the described phosphorus ore dry powder calcining temperature that is rapidly heated fully calcined.
8. low-quality Rock Phosphate (72Min BPL) according to claim 7 prepares the power-economizing method of yellow phosphorus, it is characterized in that: the tail gas that the thermal source of described phosphorus ore dry powder preheating is produced by calcining provides.
9. prepare the power-economizing method of yellow phosphorus according to the described low-quality Rock Phosphate (72Min BPL) of claim 3-8 any one, it is characterized in that: the inlet temperature in described flash drying is 300 ℃-600 ℃, the 50 ℃≤T of temperature out of described flash drying<100 ℃ or 100 ℃≤T<150 ℃ or 150 ℃≤T≤200 ℃.
10. low-quality Rock Phosphate (72Min BPL) according to claim 7 prepares the power-economizing method of yellow phosphorus, it is characterized in that: the calcining temperature of described calcination process is 700 ℃≤T<800 ℃ or 800 ℃≤T<900 ℃ or 900 ℃≤T<1100 ℃ or 1000 ℃≤T<1100 ℃ or 1100 ℃≤T<1150 ℃ or 1150 ℃≤T≤1200 ℃, and described phosphorus ore dry powder is 1-10s at the calcining residing time in furnace.
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Cited By (6)
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| CN103922376A (en) * | 2014-04-23 | 2014-07-16 | 成都乐氏化工工程有限公司 | Method of regenerating quick lime by waste lime powder in calcium carbide production |
| CN104085866A (en) * | 2014-04-23 | 2014-10-08 | 成都乐氏化工工程有限公司 | Production method for improving quality and yield of phosphoric acid |
| CN104261368A (en) * | 2014-09-24 | 2015-01-07 | 云南天安化工有限公司 | Powdered rock phosphate pellet pressing, molding and drying method |
| CN104261367A (en) * | 2014-09-24 | 2015-01-07 | 云南天安化工有限公司 | Short-process decarburization process of powdered rock phosphate for yellow phosphorus production |
| CN105329865A (en) * | 2015-07-30 | 2016-02-17 | 成都乐氏化工工程有限公司 | Method and preparation technology used for producing yellow phosphorus from low-grade phosphate ore |
| CN111453707A (en) * | 2020-05-26 | 2020-07-28 | 嘉兴学院 | Phosphorus coal pelletizing equipment of yellow phosphorus production usefulness |
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| CN111453707A (en) * | 2020-05-26 | 2020-07-28 | 嘉兴学院 | Phosphorus coal pelletizing equipment of yellow phosphorus production usefulness |
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| CN103466573B (en) | 2015-05-20 |
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