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Method for comprehensively utilizing chlor-alkali salt sludge

A technology of chlor-alkali salt and salt mud, which is applied in the field of comprehensive utilization of chlor-alkali salt mud, can solve the problems of wasting transportation costs and unfavorable environmental protection, and achieve the effect of low equipment requirements and simple production process

Inactive Publication Date: 2012-03-28
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then press filter into a cake and transport it away for accumulation, which is not conducive to environmental protection and wastes transportation costs

Method used

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  • Method for comprehensively utilizing chlor-alkali salt sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The hydrochloric acid concentration that adopts is 0.1mol / L, and the NaOH solution concentration that adopts is 0.5mol / L;

[0049] Mix the chlor-alkali salt mud with water and stir evenly, the mixing ratio is chlor-alkali salt mud by weight: water=1:5, then add hydrochloric acid to adjust the pH=1 of the mixture, obtain the slurry, and generate CO 2 the gas is recovered;

[0050] Filter the slurry with a 100-mesh sieve to obtain a filter cake and a filtrate, and dry the filter cake to remove moisture to obtain quartz sand;

[0051] Add NaOH solution to the primary filtrate and stir evenly, adjust the pH=4 of the primary filtrate, then filter under stirring conditions to obtain secondary filter cake and secondary filtrate;

[0052] Add NaOH solution to the secondary filter cake and stir evenly, adjust the pH of the secondary filter cake to 9, and then filter under stirring conditions to obtain the third filter cake and the third filtrate, and calcinate the third filter ...

Embodiment 2

[0059] The hydrochloric acid concentration that adopts is 0.2mol / L, and the NaOH solution concentration that adopts is 0.4mol / L;

[0060] Mix chlor-alkali salt mud and water and stir evenly, the mixing ratio is chlor-alkali salt mud: water = 1:10 by weight, then add hydrochloric acid to adjust the pH of the mixture to 2, obtain slurry, and generate CO at the same time 2 the gas is recovered;

[0061] Filter the slurry with a 160-mesh sieve to obtain a filter cake and a filtrate, and dry the filter cake to remove moisture to obtain quartz sand;

[0062] Add NaOH solution to the primary filtrate and stir evenly, adjust the pH=5 of the primary filtrate, then filter under stirring conditions to obtain secondary filter cake and secondary filtrate;

[0063] Add NaOH solution to the secondary filter cake and stir evenly, adjust the pH of the secondary filter cake to 10, and then filter under stirring conditions to obtain the third filter cake and the third filtrate, and calcinate th...

Embodiment 3

[0070] The hydrochloric acid concentration that adopts is 0.4mol / L, and the NaOH solution concentration that adopts is 0.3mol / L;

[0071] Mix chlor-alkali salt mud with water and stir evenly, the mixing ratio is chlor-alkali salt mud: water = 1:15 by weight, then add hydrochloric acid to adjust the pH of the mixture to 3, obtain slurry, and generate CO 2 the gas is recovered;

[0072] Filter the slurry with a 160-mesh sieve to obtain a filter cake and a filtrate, and dry the filter cake to remove moisture to obtain quartz sand;

[0073] Add NaOH solution to the primary filtrate and stir evenly, adjust the pH=6 of the primary filtrate, then filter under stirring conditions to obtain secondary filter cake and secondary filtrate;

[0074] Add NaOH solution to the secondary filter cake and stir evenly, adjust the pH of the secondary filter cake to 11, and then filter under stirring conditions to obtain the third filter cake and the third filtrate, and calcinate the third filter c...

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Abstract

The invention relates to a method for comprehensively utilizing chlor-alkali salt sludge, which comprises the following steps: mixing and filtering the chlor-alkali salt sludge and water to obtain a first filter cake and first filter liquor; adding alkali liquor to the first filter liquor, and filtering to obtain a second filter cake and second filter liquor; adding the alkali liquor to the second filter cake, and filtering to obtain a third filter cake and third filter liquor; calcining the third filter cake; adding hydrochloric acid to the third filter liquor, and filtering to obtain a fourth filter cake and fourth filter liquor; drying the fourth filter cake; adding the alkali liquor to the second filter liquor, and filtering to obtain a fifth filter cake and fifth filter liquor; calcining the fifth filter cake; adding the alkali liquor to the fifth filter liquor, and filtering to obtain a sixth filter cake and sixth filter liquor; mixing the sixth filter cake and the water into slurry, and carrying out the spray drying on the slurry; introducing CO2 into the sixth filter liquor, and filtering to obtain seventh filter liquor and a seventh filter cake; and calcining the seventh filter cake. The method respectively extracts various materials by adding acid and alkali to the chlor-alkali salt sludge and successively filtering, and has the advantages of simple production process flow, low equipment requirement and no other pollution after the treatment is finished.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a comprehensive utilization method of chlor-alkali salt mud. Background technique [0002] The main raw material used in the production of soda ash by the ammonia-soda method and the production of caustic soda by the electrolysis method is crude salt. Because the crude salt contains impurities, the refined salt and brine must be refined in the brine process, and the "three wastes" discharged from the brine process are mainly salt mud. [0003] The chemical reaction equation for the production of soda ash by ammonia-soda method or the production of caustic soda by electrolysis method is: [0004] 2NaCl+2H 2 O=2NaOH+Cl 2 +H 2 [0005] In the production process, the salt or brine refining process is to remove impurities in seawater or brine to obtain high-purity sodium chloride solution. Since seawater often contains Mg 2+ , Ca 2+ , SO 4 2+ ,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/06C01B33/12C01F7/02C01F5/22C01F11/02
Inventor 高玉娟
Owner LIAONING TECHNICAL UNIVERSITY
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