CN101823737B - Method for producing light magnesium carbonate and co-producing ultra-fine calcium carbonate and sodium silicate by chlor-alkali salt sludge - Google Patents
Method for producing light magnesium carbonate and co-producing ultra-fine calcium carbonate and sodium silicate by chlor-alkali salt sludge Download PDFInfo
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- CN101823737B CN101823737B CN2010101696229A CN201010169622A CN101823737B CN 101823737 B CN101823737 B CN 101823737B CN 2010101696229 A CN2010101696229 A CN 2010101696229A CN 201010169622 A CN201010169622 A CN 201010169622A CN 101823737 B CN101823737 B CN 101823737B
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Abstract
The invention discloses a method for producing light magnesium carbonate and coproducing ultrafine calcium carbonate and sodium silicate by using chlorine salt mud.
Description
Technical field
The present invention relates to the production method of magnesiumcarbonate and lime carbonate, particularly, relate to a kind of method of producing Magnesium Carbonate Light 41-45 co-producing ultra-fine lime carbonate and water glass with the chlor-alkali salt slurry.
Background technology
The chlor-alkali salt slurry is from the pulpous state discharge that is produced in the refining crude salt process, and the sedimentary discharge of gained is a sea salt mud behind the salt solution separate part sodium-chlor.The main component of salt slurry is magnesium oxide, calcium oxide, silicon-dioxide, barium sulfate and a spot of sodium-chlor and mud.Thereby potential huge utility value.Yet at present, the salt slurry of most of producers is not effectively handled and is utilized, and only is used to build dykes and dams and roadbed material after the dehydration, perhaps stacks in factory throughout the year.Near perhaps directly entering rivers,lakes and seas, thus cause serious environmental to pollute.
The complicated component that salt slurry contains brings certain difficulty to industrial utilization, but because of its potential utility value, people also constantly explore the salt slurry utilization of waste material, are converted into the method for useful Industrial products.Application number is that 200310122805.5 patent of invention discloses a kind of technology of utilizing the chlor-alkali salt slurry to produce ultra-fine barium sulfate and lime carbonate, its process characteristic is a salt material-mud elder generation net filtration after filtration, dry, calcining obtains ultra-fine barium sulfate through technological processs such as dissolving with hydrochloric acid, separation, washing, drying, comminution by gas stream again; The filtrate of filtering gained adds ammoniacal liquor and transfers pH to remove impurity such as ferrimanganic, and the clear liquid after the removal of impurities adds volatile salt and tensio-active agent, stirs, reaction obtains calcium carbonate superfine powder.The advantage of this invention is utilization of waste material, has reduced environmental pollution, and produces ultra-fine barium sulfate and the lime carbonate obtain from salt slurry, for the comprehensive utilization of salt slurry provides a new way.Yet this is invented described technology and has only utilized barium sulfate and the calcium cpd that is contained in the salt slurry, magnesium compound and silicon compound are not utilized and excavation, thereby, be not the technology of the comprehensive utilization of an ideal salt slurry.
Therefore, in order fully to extract and utilize effective constituent in the salt slurry,, be necessary to carry out new exploration and research for the comprehensive utilization of salt slurry provides cost-effective approach.
Summary of the invention
For this reason, the invention provides a kind of method of producing Magnesium Carbonate Light 41-45 co-producing ultra-fine lime carbonate and water glass with the chlor-alkali salt slurry, compounds such as the calcium that contains in the salt slurry, magnesium, silicon are effectively extracted and utilized to this method, given full play to the potential value of salt slurry, for the comprehensive utilization of salt slurry provides cost-effective approach.
Technical scheme of the present invention is: a kind of method of producing Magnesium Carbonate Light 41-45 co-producing ultra-fine lime carbonate and water glass with the chlor-alkali salt slurry comprises the steps:
A:, remove the acid group impurity of solubility with washing filter (1) filter wash three times of chlor-alkali salt slurry; At this moment, contain in the salt slurry with magnesium oxide, calcium oxide and silicon-dioxide are the compound of main component;
B: steps A gained salt slurry is put in first carbonizer (2), and in first carbonizer (2) in according to salt slurry contained magnesium oxide and the mass ratio 1: 1.8～2.2 of carbonic acid gas pure substance feed carbon dioxides, carry out carburizing reagent; This moment, Magnesium hydrogen carbonate or magnesiumcarbonate were produced in the reaction of magnesium oxide and carbonic acid gas and water, and the two is water soluble all; Calcium oxide and carbon dioxide reaction are produced lime carbonate, and lime carbonate is water insoluble substantially, thereby precipitates;
C: step B products therefrom is filtered through first filter (4), obtain first filter cake and first settled solution; Be main component with lime carbonate and silicon-dioxide in described first filter cake; In first settled solution based on Magnesium hydrogen carbonate or magnesiumcarbonate;
Resulting first settled solution of D: step C obtains fine Magnesium Carbonate Light 41-45 product (17) through slurry tank (5) thermal degradation, dry, selection by winnowing wrapping machine (7) packing of sedimentation moisture eliminator (6);
E: first filter cake and ammonium chloride that step C obtains are put into reaction in the corrosion-resistant reactor (8) according to the mass ratio 1: 0.87～1.27 of the pure substance of lime carbonate and ammonium chloride, generate calcium chloride and ammoniacal liquor and carbon dioxide, filter through second strainer (9), get second filter cake and second clear filtrate; Based on silicon-dioxide, its mass content reaches 80% in second filter cake; In second clear filtrate based on calcium chloride and ammoniacal liquor;
F: second clear filtrate that step e obtains is knocked down second carbonizer (10), with mass concentration is that 5～10% tensio-active agents carry out surface treatment, stir speed (S.S.) is 200～320r/min, and in second carbonizer (10), feed carbon dioxide, making calcium chloride and carbonic acid gas in second clear filtrate is 1: 0.19～0.59 to carry out carbonization according to the ratio of the quality of pure substance, product filters through the 3rd strainer (12), gets the 3rd filter cake of clarifying ammonium chloride filtrate and white; The 3rd filter cake is a lime carbonate;
G: the 3rd filter cake of the white of step e gained is through washing machine (13) washing, moisture eliminator (14) drying, pulverizer (15), obtains super fine calcium carbonate product (18);
H: resulting second filter cake of step e is put into revolving horizontal drum reactor (16) lining with the mass ratio 1: 1.11～1.51 of the pure substance of sodium hydroxide with sodium hydroxide according to silicon-dioxide, reaction is hydrolyzed, the sodium silicate aqueous solution of reaction solution body is water glass (19).
Measure the carburizing reagent terminal point with the first carbonization table (3) among the step B.
Measure the carburizing reagent terminal point with the second carbonization table (11) in the step F.
Used carbon dioxide is pure carbon dioxide gas or carbonic acid gas volume content greater than 20% mixed gas in step B and the step F.
Carbonation reaction temperature is controlled at 0～40 ℃ among the step D.
Described tensio-active agent is selected from described tensio-active agent and is selected from emulsifiable concentrate, tween 80 and the mixture of the two.
Method of producing Magnesium Carbonate Light 41-45 co-producing ultra-fine lime carbonate and water glass of the present invention with the chlor-alkali salt slurry,
Its chemical equation is: MgO+2CO
2+ H
2O=Mg (HCO
3)
2
MgO+CO
2＝MgCO
3
Mg(HCO
3)
2＝MgCO
3+H
2O+CO
2
CaCO
3+2NH
4Cl+H
2O＝CaCl
2+CO
2+2NH
4OH
CaCl
2+CO
2+2NH
4OH＝CaCO
3+2NH
4Cl+H
2O
SiO
2+2NaOH＝Na
2SiO
3+H
2O
Method of producing Magnesium Carbonate Light 41-45 co-producing ultra-fine lime carbonate and water glass with the chlor-alkali salt slurry of the present invention, effectively extract and utilized compounds such as the calcium that contains in the salt slurry, magnesium, silicon, given full play to the potential value of salt slurry, for the comprehensive utilization of salt slurry provides cost-effective approach.This method is simple, processing ease, and economic benefit is higher.
Description of drawings
Fig. 1 has showed method technical process of producing Magnesium Carbonate Light 41-45 co-producing ultra-fine lime carbonate and water glass with the chlor-alkali salt slurry of the present invention, wherein,
(1): washing filter (2): first carbonizer (3): the first carbonization table
(4): first strainer (5): slurry tank (6): sedimentation moisture eliminator
(7): selection by winnowing wrapping machine (8): corrosion-resistant reactor (9): second strainer
(10): second carbonizer (11): the second carbonization table (12): the 3rd strainer
(13): washing machine (14): moisture eliminator (15): pulverizer
(16): revolving horizontal drum reactor (17): magnesiumcarbonate product (18): calcium carbonate product,
(19): water glass
Embodiment
Further describe and illustrate method of producing ultra tiny magnesium carbonate and co-producing lime carbonate and water glass of the present invention below in conjunction with specific embodiment, disclose materials such as the magnesium oxide how to utilize method of the present invention to extract and utilize in the salt slurry to be contained, calcium oxide, silicon-dioxide with the chlor-alkali salt slurry.
Chlor-alkali salt slurry of the present invention is from the salt slurry that obtains for raw material salt manufacturing with sea salt.After testing, magnesian mass content is 19.34% in the used salt slurry of following embodiment, and the mass content of calcium oxide is 19%, and the mass content of silicon-dioxide is 21.88%.
Embodiment one
A kind of method of producing Magnesium Carbonate Light 41-45 co-producing ultra-fine lime carbonate and water glass with the chlor-alkali salt slurry, comprise the steps: washing filter (1) filter wash three times of 500kg chlor-alkali salt slurry, remove the acid group impurity of solubility, at this moment, contain in the salt slurry with magnesium oxide, calcium oxide and silicon-dioxide are the compound of main component; Then, the gained salt slurry is put in first carbonizer (2), and in first carbonizer (2), fed pure carbon dioxide gas, make magnesium oxide contained in the salt slurry and carbonic acid gas carry out carbonization at 1: 2.0 according to the mass ratio of pure substance; This moment, Magnesium hydrogen carbonate or magnesiumcarbonate were produced in the reaction of magnesium oxide and carbonic acid gas and water, and the two is water soluble all; Calcium oxide and carbon dioxide reaction are produced lime carbonate, and lime carbonate is water insoluble substantially, thereby precipitates; The carburizing reagent products therefrom being filtered through first filter (4), obtain first filter cake and first settled solution, is main component with lime carbonate and silicon-dioxide in described first filter cake, in first settled solution based on Magnesium hydrogen carbonate or magnesiumcarbonate; First settled solution obtains fine Magnesium Carbonate Light 41-45 product (17) through slurry tank (5) thermal degradation, dry, selection by winnowing wrapping machine (7) packing of sedimentation moisture eliminator (6); First filter cake and ammonium chloride are put into reaction in the corrosion-resistant reactor (8) according to the mass ratio of the pure substance of lime carbonate and ammonium chloride at 1: 1.27, generate calcium chloride and ammoniacal liquor and carbon dioxide, filter through second strainer (9), get second filter cake and second clear filtrate; Based on silicon-dioxide, its mass content reaches 80% in second filter cake; In second clear filtrate based on calcium chloride and ammoniacal liquor; Second clear filtrate is knocked down second carbonizer (10), with mass concentration is that 5% tensio-active agent emulsifiable concentrate is handled, stir speed (S.S.) is 200r/min, and the carbon dioxide containing gas volume is 25% mixed gas in second carbonizer (10), making calcium chloride and carbonic acid gas in second clear filtrate is to carry out carbonization at 1: 0.19 according to the ratio of the quality of pure substance, carbonation reaction temperature is controlled to be 10～20 ℃ of products and filters through the 3rd strainer (12), gets the 3rd filter cake of clarifying ammonium chloride filtrate and white; The 3rd filter cake is a lime carbonate; The 3rd filter cake of white is through washing machine (13) washing, moisture eliminator (14) drying, pulverizer (15), obtains super fine calcium carbonate product (18); Second filter cake is put into revolving horizontal drum reactor (16) lining with the mass ratio of the pure substance of sodium hydroxide 1: 1.11 with sodium hydroxide according to silicon-dioxide, the reaction that is hydrolyzed, and the sodium silicate aqueous solution of reaction solution body is water glass (19).
Embodiment two
A kind of method of producing Magnesium Carbonate Light 41-45 co-producing ultra-fine lime carbonate and water glass with the chlor-alkali salt slurry, comprise the steps: washing filter (1) filter wash three times of 500kg chlor-alkali salt slurry, remove the acid group impurity of solubility, at this moment, contain in the salt slurry with magnesium oxide, calcium oxide and silicon-dioxide are the compound of main component; Then, the gained salt slurry is put in first carbonizer (2), and to feed the carbon dioxide containing gas volume in first carbonizer (2) be 25% mixed gas, make magnesium oxide contained in the salt slurry and carbonic acid gas carry out carbonization at 1: 1.8 according to the mass ratio of pure substance, carbonation reaction temperature is controlled to be 15～20 ℃; This moment, Magnesium hydrogen carbonate or magnesiumcarbonate were produced in the reaction of magnesium oxide and carbonic acid gas and water, and the two is water soluble all; Calcium oxide and carbon dioxide reaction are produced lime carbonate, and lime carbonate is water insoluble substantially, thereby precipitates; The carburizing reagent products therefrom being filtered through first filter (4), obtain first filter cake and first settled solution, is main component with lime carbonate and silicon-dioxide in described first filter cake, in first settled solution based on Magnesium hydrogen carbonate or magnesiumcarbonate; First settled solution obtains fine Magnesium Carbonate Light 41-45 product (17) through slurry tank (5) thermal degradation, dry, selection by winnowing wrapping machine (7) packing of sedimentation moisture eliminator (6); First filter cake and ammonium chloride are put into reaction in the corrosion-resistant reactor (8) according to the mass ratio of the pure substance of lime carbonate and ammonium chloride at 1: 1.0, generate calcium chloride and ammoniacal liquor and carbon dioxide, filter through second strainer (9), get second filter cake and second clear filtrate; Based on silicon-dioxide, its mass content reaches 80% in second filter cake; In second clear filtrate based on calcium chloride and ammoniacal liquor; Second clear filtrate is knocked down second carbonizer (10), with mass concentration is that 8% tensio-active agent is handled, wherein to contain mass concentration be that 3% emulsifiable concentrate and mass concentration are 5% polysorbas20 to tensio-active agent, stir speed (S.S.) is 280r/min, and the carbon dioxide containing gas volume is 40% mixed gas in second carbonizer (10), making calcium chloride and carbonic acid gas in second clear filtrate is to carry out carbonization at 1: 0.30 according to the ratio of the quality of pure substance, carbonation reaction temperature is controlled to be 35～40 ℃, product filters through the 3rd strainer (12), gets the 3rd filter cake of clarifying ammonium chloride filtrate and white; The 3rd filter cake is a lime carbonate; The 3rd filter cake of white is through washing machine (13) washing, moisture eliminator (14) drying, pulverizer (15), obtains super fine calcium carbonate product (18); Second filter cake is put into revolving horizontal drum reactor (16) lining with the mass ratio of the pure substance of sodium hydroxide 1: 1.35 with sodium hydroxide according to silicon-dioxide, the reaction that is hydrolyzed, and the sodium silicate aqueous solution of reaction solution body is water glass (19).
Embodiment three
A kind of method of producing Magnesium Carbonate Light 41-45 co-producing ultra-fine lime carbonate and water glass with the chlor-alkali salt slurry, comprise the steps: washing filter (1) filter wash three times of 500kg chlor-alkali salt slurry, remove the acid group impurity of solubility, at this moment, contain in the salt slurry with magnesium oxide, calcium oxide and silicon-dioxide are the compound of main component; Then, the gained salt slurry is put in first carbonizer (2), and the carbon dioxide containing gas volume is 40% mixed gas in first carbonizer (2), make magnesium oxide contained in the salt slurry and carbonic acid gas carry out carbonization at 1: 2.2 according to the mass ratio of pure substance, carbonation reaction temperature is controlled to be 20～25 ℃; This moment, Magnesium hydrogen carbonate or magnesiumcarbonate were produced in the reaction of magnesium oxide and carbonic acid gas and water, and the two is water soluble all; Calcium oxide and carbon dioxide reaction are produced lime carbonate, and lime carbonate is water insoluble substantially, thereby precipitates; The carburizing reagent products therefrom being filtered through first filter (4), obtain first filter cake and first settled solution, is main component with lime carbonate and silicon-dioxide in described first filter cake, in first settled solution based on Magnesium hydrogen carbonate or magnesiumcarbonate; First settled solution obtains fine Magnesium Carbonate Light 41-45 product (17) through slurry tank (5) thermal degradation, dry, selection by winnowing wrapping machine (7) packing of sedimentation moisture eliminator (6); First filter cake and ammonium chloride are put into reaction in the corrosion-resistant reactor (8) according to the mass ratio of the pure substance of lime carbonate and ammonium chloride at 1: 0.87, generate calcium chloride and ammoniacal liquor and carbon dioxide, filter through second strainer (9), get second filter cake and second clear filtrate; Based on silicon-dioxide, its mass content reaches 80% in second filter cake; In second clear filtrate based on calcium chloride and ammoniacal liquor; Second clear filtrate is knocked down second carbonizer (10), with mass concentration is that 10% tensio-active agent is handled, wherein to contain mass concentration be 10% polysorbas20 to tensio-active agent, stir speed (S.S.) is 320r/min, and to feed the carbon dioxide containing gas volume in second carbonizer (10) be 35% mixed gas, making calcium chloride and carbonic acid gas in second clear filtrate is to carry out carbonization at 1: 0.59 according to the ratio of the quality of pure substance, carbonation reaction temperature is controlled to be 10～15 ℃ of products and filters through the 3rd strainer (12), gets the 3rd filter cake of clarifying ammonium chloride filtrate and white; The 3rd filter cake is a lime carbonate; The 3rd filter cake of white is through washing machine (13) washing, moisture eliminator (14) drying, pulverizer (15), obtains super fine calcium carbonate product (18); Second filter cake is put into revolving horizontal drum reactor (16) lining with the mass ratio of the pure substance of sodium hydroxide 1: 1.51 with sodium hydroxide according to silicon-dioxide, the reaction that is hydrolyzed, and the sodium silicate aqueous solution of reaction solution body is water glass (19).
The foregoing description is preferred embodiment of the present invention, is not to be used for limiting the scope of the present invention, so all equivalences of being done with described feature of claim of the present invention and principle change or modify, all should be included within the claim scope of the present invention.
Claims (4)
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| CN2010101696229A CN101823737B (en) | 2010-04-30 | 2010-04-30 | Method for producing light magnesium carbonate and co-producing ultra-fine calcium carbonate and sodium silicate by chlor-alkali salt sludge |
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