CN101837993A - Method for producing sodium hydroxide and co-producing calcium carbonate by using carbide slag - Google Patents
Method for producing sodium hydroxide and co-producing calcium carbonate by using carbide slag Download PDFInfo
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- CN101837993A CN101837993A CN201010157796A CN201010157796A CN101837993A CN 101837993 A CN101837993 A CN 101837993A CN 201010157796 A CN201010157796 A CN 201010157796A CN 201010157796 A CN201010157796 A CN 201010157796A CN 101837993 A CN101837993 A CN 101837993A
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Abstract
The invention discloses a method for producing sodium hydroxide and co-producing calcium carbonate by using carbide slag, which comprises: acidifying the carbide slag and purifying the product of the acidification to obtain pure calcium hydroxide, preparing an emulsion of the calcium hydroxide precipitate with water again, and reacting the emulsion of the calcium hydroxide with solution of sodium carbonate to obtain mixed solution of sodium hydroxide and calcium carbonate; performing centrifugal separation on the mixed solution of sodium hydroxide and calcium carbonate to obtain solution of sodium hydroxide and a wet calcium carbonate product and distilling the solution of sodium hydroxide under a reduced pressure to obtain 45 mass percent solution of sodium hydroxide; and drying the wet calcium carbonate product and grinding the dried calcium carbonate product to obtain a calcium carbonate product. The method changes waste into valuable things, uses a large amount of waste slag, protects environment, reduces production cost and simplifies production process. Thus, the method can create great economic benefits.
Description
Technical field
The present invention relates to the technical field of Comprehensive Utilization for Carbide Slag and improvement, particularly, relate to a kind of method of producing sodium hydroxide and co-producing calcium carbonate with carbide slag.
Background technology
Carbide slag is that the resistates that acetylene produced is produced in the calcium carbide hydrolysis, be the emulsion of solid content at 8%-10%, have another name called calcium carbide mud, its main chemical compositions is a calcium hydroxide, also contain the aqueous solution such as solid impurities such as Calucium Silicate powder, calcium aluminate, ferrosilicon and breeze and sulfurated lime, calcium hydroxide, acetylene, being a kind of strong basicity that is, being rich in abundant calcium resource, is that can to produce a series of needs such as lime carbonate, cement calcareous be the product of raw material to raw material with it.But because wherein impurities is more, water content is high, composition is complicated, undressed carbide slag can't directly utilize.On the other hand, flourish along with the calcium carbide industry, the quantity discharged of carbide slag also increases day by day, factory's discharging calcium carbide mud of producing 200,000 tons of PVC year reaches 3,600,000 tons/year, a large amount of carbide slags can't effectively utilize, directly pile up, cause the soil artificially to alkalize, ecotope is caused the pollution that is difficult to recover severe contamination farmland and underground water.
The method of producing sodium hydroxide at present mainly contains two kinds, and the one, causticizing process, this method is a raw material with soda ash (yellow soda ash) solution and lime, makes it that causticizing reaction take place, and generates sodium hydroxide (caustic soda) solution and precipitation of calcium carbonate (lime mud).Behind the insolubless such as elimination precipitation of calcium carbonate, evaporating solns and the sodium hydroxide (caustic soda) of liquid or solid.Precipitation of calcium carbonate can be used as the raw material of cement etc. after washing, the lime carbonate slag of generation can reclaim calcium oxide (unslaked lime) and partial CO 2 through clean, dry, calcining.
Compare with electrolytic process hydrogen manufacturing sodium oxide (caustic soda), because soda ash is the higher raw material of purity, sodium chloride-containing is few, and the purity of gained sodium hydroxide (caustic soda) is also higher.But need to consume another kind of important product soda ash.
Therefore, be necessary to explore the method for new production sodium hydroxide.
Summary of the invention
In order to address the above problem, the invention provides a kind of method of producing sodium hydroxide and co-producing calcium carbonate with carbide slag, this method turns waste into wealth; consume a large amount of waste residues, protected environment, production cost is low; production process is simple, is a method that has than the large economy benefit.
Technical scheme of the present invention is as follows: a kind of method of producing sodium hydroxide and co-producing calcium carbonate with carbide slag comprises the steps:
Carbide slag acidified, purification obtains purified calcium hydroxide: carbide slag is modulated into emulsion, put in the reactor (1) with pure substance mass ratio 1: 0.76～1.16 with dilute hydrochloric acid, under agitation carry out chemical reaction, obtain the mixed solution of carbon dust and calcium chloride; The mixed solution of carbon dust and calcium chloride suction filtration in first suction filter pump (2) gets clarifying calcium chloride filtrate and carbon dust filter cake; The carbon dust filter cake is used to make carbon dust; Clarifying calcium chloride filtrate and sodium hydroxide solution are 1: 0.52～0.92 to drop in the synthesizer (3) according to the ratio of calcium chloride and sodium hydroxide pure substance quality, stir reaction down, obtain calcium hydroxide precipitation and sodium-chlor mixed solution; Suction filtration in second suction filter pump (4) gets gets clarifying sodium chloride solution and calcium hydroxide precipitation with calcium hydroxide precipitation and sodium-chlor mixed solution;
The calcium hydroxide precipitation is reconciled into emulsion again with clear water, the soda ash good with dissolving is 1: 1.23～1.63 input causticization still (5) linings according to calcium hydroxide and soda ash pure substance mass ratio, carry out chemical reaction under the stirring slowly, temperature of reaction is controlled at 40～50 ℃, reacted 2～5 hours, and obtained the mixing liquid of sodium hydroxide and lime carbonate; The mixing liquid of sodium hydroxide and lime carbonate is centrifugal through whizzer (6), obtains sodium hydroxide solution and calcium carbonate wet product after the separation, and sodium hydroxide solution is through vacuum distilling apparatus (7) underpressure distillation, and obtaining mass concentration is 45% sodium hydroxide solution (8); Calcium carbonate wet product drying machine (9) oven dry, pulverizer (10) is pulverized, and obtains calcium carbonate product (11).
The chemical principle that aforesaid method relates to is:
Ca(OH)
2+2HCI＝CaCl
2+H
2O
CaCl
2+2NaOH＝Ca(OH)
2+2NaCI
Ca(OH)
2+Na
2CO
3＝2NaOH+Ca?CO
3
Method of producing sodium hydroxide and co-producing calcium carbonate with carbide slag of the present invention utilizes the calcareous resource in the carbide slag to produce lime, avoids the pollution of carbide slag to environment, reduces the Wingdale exploitation to environment damage, is a very cost-effective method.
Description of drawings
Fig. 1 of the present inventionly produces the process flow sheet of the method for sodium hydroxide and co-producing calcium carbonate with carbide slag, wherein
1---reactor, 2---first suction filter pump, 3---synthesizer,
4---second suction filter pump, 5---the causticization still, 6---whizzer,
7---vacuum distilling apparatus, 8---sodium hydroxide solution, 9---moisture eliminator,
10---pulverizer, 11---calcium carbonate product.
Embodiment
Below in conjunction with specific embodiment the method with carbide slag production sodium hydroxide and co-producing calcium carbonate of the present invention is described further and illustrates.
Embodiment one:
A kind of method of producing sodium hydroxide and co-producing calcium carbonate with carbide slag, comprise the steps: the acidified of 600kg carbide slag, purification obtains purified calcium hydroxide: carbide slag is modulated into emulsion, put at 1: 0.76 in the reactor (1) with the pure substance mass ratio with dilute hydrochloric acid, under agitation carry out chemical reaction, obtain the mixed solution of carbon dust and calcium chloride; The mixed solution of carbon dust and calcium chloride suction filtration in first suction filter pump (2) gets clarifying calcium chloride filtrate and carbon dust filter cake; The carbon dust filter cake is used to make carbon dust; Clarifying calcium chloride filtrate and sodium hydroxide solution are to drop in synthesizer (3) at 1: 0.52 according to the ratio of calcium chloride and sodium hydroxide pure substance quality, stir reaction down, obtain calcium hydroxide precipitation and sodium-chlor mixed solution; Suction filtration in second suction filter pump (4) gets gets clarifying sodium chloride solution and calcium hydroxide precipitation with calcium hydroxide precipitation and sodium-chlor mixed solution;
The calcium hydroxide precipitation is reconciled into emulsion again with clear water, the soda ash good with dissolving is 1: 1.43 input causticization still (5) lining according to calcium hydroxide and soda ash pure substance mass ratio, carry out chemical reaction under the stirring slowly, temperature of reaction is controlled at 40～50 ℃, reacted 3 hours, and obtained the mixing liquid of sodium hydroxide and lime carbonate; The mixing liquid of sodium hydroxide and lime carbonate is centrifugal through whizzer (6), obtain sodium hydroxide solution and calcium carbonate wet product after the separation, sodium hydroxide solution is through vacuum distilling apparatus (7) underpressure distillation, and obtaining mass concentration is 45% sodium hydroxide solution (8) 1438.89kg; Calcium carbonate wet product drying machine (9) oven dry, pulverizer (10) is pulverized, and obtains calcium carbonate product (11) 809.44kg.
Embodiment two:
A kind of method of producing sodium hydroxide and co-producing calcium carbonate with carbide slag, comprise the steps: the acidified of 600kg carbide slag, purification obtains purified calcium hydroxide: carbide slag is modulated into emulsion, put at 1: 0.9 in the reactor (1) with the pure substance mass ratio with dilute hydrochloric acid, under agitation carry out chemical reaction, obtain the mixed solution of carbon dust and calcium chloride; The mixed solution of carbon dust and calcium chloride suction filtration in first suction filter pump (2) gets clarifying calcium chloride filtrate and carbon dust filter cake; The carbon dust filter cake is used to make carbon dust; Clarifying calcium chloride filtrate and sodium hydroxide solution are to drop in synthesizer (3) at 1: 0.72 according to the ratio of calcium chloride and sodium hydroxide pure substance quality, stir reaction down, obtain calcium hydroxide precipitation and sodium-chlor mixed solution; Suction filtration in second suction filter pump (4) gets gets clarifying sodium chloride solution and calcium hydroxide precipitation with calcium hydroxide precipitation and sodium-chlor mixed solution;
The calcium hydroxide precipitation is reconciled into emulsion again with clear water, the soda ash good with dissolving is 1: 1.23 input causticization still (5) lining according to calcium hydroxide and soda ash pure substance mass ratio, carry out chemical reaction under the stirring slowly, temperature of reaction is controlled at 40～50 ℃, reacted 3 hours, and obtained the mixing liquid of sodium hydroxide and lime carbonate; The mixing liquid of sodium hydroxide and lime carbonate is centrifugal through whizzer (6), obtain sodium hydroxide solution and calcium carbonate wet product after the separation, sodium hydroxide solution is through vacuum distilling apparatus (7) underpressure distillation, and obtaining mass concentration is 45% sodium hydroxide solution (8) 1237.73kg; Calcium carbonate wet product drying machine (9) oven dry, pulverizer (10) is pulverized, and obtains calcium carbonate product (11) 696.22kg.
Embodiment three:
A kind of method of producing sodium hydroxide and co-producing calcium carbonate with carbide slag, comprise the steps: the acidified of 600kg carbide slag, purification obtains purified calcium hydroxide: carbide slag is modulated into emulsion, put at 1: 1.16 in the reactor (1) with the pure substance mass ratio with dilute hydrochloric acid, under agitation carry out chemical reaction, obtain the mixed solution of carbon dust and calcium chloride; The mixed solution of carbon dust and calcium chloride suction filtration in first suction filter pump (2) gets clarifying calcium chloride filtrate and carbon dust filter cake; The carbon dust filter cake is used to make carbon dust; Clarifying calcium chloride filtrate and sodium hydroxide solution are to drop in synthesizer (3) at 1: 0.92 according to the ratio of calcium chloride and sodium hydroxide pure substance quality, stir reaction down, obtain calcium hydroxide precipitation and sodium-chlor mixed solution; Suction filtration in second suction filter pump (4) gets gets clarifying sodium chloride solution and calcium hydroxide precipitation with calcium hydroxide precipitation and sodium-chlor mixed solution;
The calcium hydroxide precipitation is reconciled into emulsion again with clear water, the soda ash good with dissolving is 1: 1.63 input causticization still (5) lining according to calcium hydroxide and soda ash pure substance mass ratio, carry out chemical reaction under the stirring slowly, temperature of reaction is controlled at 40～50 ℃, reacted 3 hours, and obtained the mixing liquid of sodium hydroxide and lime carbonate; The mixing liquid of sodium hydroxide and lime carbonate is centrifugal through whizzer (6), obtain sodium hydroxide solution and calcium carbonate wet product after the separation, sodium hydroxide solution is through vacuum distilling apparatus (7) underpressure distillation, and obtaining mass concentration is 45% sodium hydroxide solution (8) 1153.15kg; Calcium carbonate wet product drying machine (9) oven dry, pulverizer (10) is pulverized, and obtains calcium carbonate product (11) 810.82kg.
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 (1)
1. a method of producing sodium hydroxide and co-producing calcium carbonate with carbide slag is characterized in that, comprises the steps:
Carbide slag acidified, purification obtains purified calcium hydroxide: carbide slag is modulated into emulsion, put in the reactor (1) with pure substance mass ratio 1: 0.76～1.16 with dilute hydrochloric acid, under agitation carry out chemical reaction, obtain the mixed solution of carbon dust and calcium chloride; The mixed solution of carbon dust and calcium chloride suction filtration in first suction filter pump (2) gets clarifying calcium chloride filtrate and carbon dust filter cake; The carbon dust filter cake is used to make carbon dust; Clarifying calcium chloride filtrate and sodium hydroxide solution are 1: 0.52～0.92 to drop in the synthesizer (3) according to the ratio of calcium chloride and sodium hydroxide pure substance quality, stir reaction down, obtain calcium hydroxide precipitation and sodium-chlor mixed solution; Suction filtration in second suction filter pump (4) gets gets clarifying sodium chloride solution and calcium hydroxide precipitation with calcium hydroxide precipitation and sodium-chlor mixed solution;
The calcium hydroxide precipitation is reconciled into emulsion again with clear water, the soda ash good with dissolving is 1: 1.23～1.63 input causticization still (5) linings according to calcium hydroxide and soda ash pure substance mass ratio, carry out chemical reaction under the stirring slowly, temperature of reaction is controlled at 40～50 ℃, reacted 2～5 hours, and obtained the mixing liquid of sodium hydroxide and lime carbonate; The mixing liquid of sodium hydroxide and lime carbonate is centrifugal through whizzer (6), obtains sodium hydroxide solution and calcium carbonate wet product after the separation, and sodium hydroxide solution is through vacuum distilling apparatus (7) underpressure distillation, and obtaining mass concentration is 45% sodium hydroxide solution (8); Calcium carbonate wet product drying machine (9) oven dry, pulverizer (10) is pulverized, and obtains calcium carbonate product (11).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104437454A (en) * | 2014-12-01 | 2015-03-25 | 中国科学院过程工程研究所 | Carbide slag based solid alkali catalyst as well as preparation method and application of carbide slag based solid alkali catalyst |
| CN108585012A (en) * | 2018-05-28 | 2018-09-28 | 福建鼎盛元环保科技有限公司 | A kind of technique and production line producing calcium chloride and aluminium hydroxide using waste |
| CN112551552A (en) * | 2020-09-24 | 2021-03-26 | 宣城市楷昂化工有限公司 | Method for preparing sodium hydroxide by using carbon dioxide |
-
2010
- 2010-03-24 CN CN201010157796A patent/CN101837993A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104437454A (en) * | 2014-12-01 | 2015-03-25 | 中国科学院过程工程研究所 | Carbide slag based solid alkali catalyst as well as preparation method and application of carbide slag based solid alkali catalyst |
| CN108585012A (en) * | 2018-05-28 | 2018-09-28 | 福建鼎盛元环保科技有限公司 | A kind of technique and production line producing calcium chloride and aluminium hydroxide using waste |
| CN108585012B (en) * | 2018-05-28 | 2023-09-15 | 福建鼎盛元环保科技有限公司 | Process and production line for producing calcium chloride and aluminum hydroxide by utilizing waste |
| CN112551552A (en) * | 2020-09-24 | 2021-03-26 | 宣城市楷昂化工有限公司 | Method for preparing sodium hydroxide by using carbon dioxide |
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Open date: 20100922 |