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Method for preparing anhydrous calcium sulfate to co-produce industrial hydrochloric acid by using pure alkali distilled waste liquid

A technology of anhydrous calcium sulfate and industrial hydrochloric acid, which is applied in the preparation of chloride, calcium/strontium/barium sulfate, chlorine/hydrogen chloride, etc., can solve the problems of low economic benefits

Inactive Publication Date: 2011-05-25
汪晋强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method removes SO while consuming soda ash waste liquid 2 , but relying on the desulfurization process to consume soda ash waste liquid is too small in quantity. Although the above method partially solves the problem of stacking soda slag and avoids environmental pollution, its economic benefits of turning waste into treasure are low; A report on the method of distilling waste liquid to prepare anhydrous calcium sulfate and co-produce industrial hydrochloric acid

Method used

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  • Method for preparing anhydrous calcium sulfate to co-produce industrial hydrochloric acid by using pure alkali distilled waste liquid
  • Method for preparing anhydrous calcium sulfate to co-produce industrial hydrochloric acid by using pure alkali distilled waste liquid

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Embodiment 1

[0019] Prepare the method for anhydrous calcium sulfate co-production industrial hydrochloric acid with soda ash distillation waste liquid, 500kg soda ash distillation waste liquid containing calcium salt 12% and hydrochloric acid are put into purifier 1 according to the mass ratio of pure substance 1: 0.53 and carry out purification reaction, The reaction generates 33.60kg of calcium chloride-based solution, which is filtered with a suction filter-2, and the insoluble filter cake impurities are burned or buried, and the clarified calcium chloride filtrate plus the original solution adds up to 286.09kg of pure calcium chloride The clarified calcium chloride solution is put into the synthesizer 3 with sulfuric acid according to the mass ratio of pure substance 1: 0.68 to carry out the synthesis reaction, and the reaction generates a mixed solution of calcium sulfate dihydrate and hydrochloric acid, and the reaction product is filtered with a suction filter. Carry out suction fil...

Embodiment 2

[0021] The method for preparing anhydrous calcium sulfate co-production industrial hydrochloric acid with soda ash distillation waste liquid, puts the soda ash distillation waste liquid containing 13% of calcium salt and hydrochloric acid into purifier 1 according to the mass ratio of pure substance 1:0.73 for purification reaction, the reaction Generate 72.15kg of calcium chloride-based solution, use suction filter-2 to carry out suction filtration, burn or bury insoluble filter cake impurities, and clarify the calcium chloride filtrate plus 207.15kg of pure calcium chloride in the original solution to clarify Calcium chloride solution, then put into synthesizer 3 with sulfuric acid according to the mass ratio of pure substance 1: 0.88 to carry out synthesis reaction, the reaction generates the mixed solution of calcium sulfate dihydrate and hydrochloric acid, and the reaction product is carried out with suction filter 2 4 Suction filtration, the white filter cake obtained by ...

Embodiment 3

[0023] The method for preparing anhydrous calcium sulfate co-production industrial hydrochloric acid with soda ash distillation waste liquid, puts the soda ash distillation waste liquid containing 15% of calcium salt and hydrochloric acid into purifier 1 according to the mass ratio of pure substance 1:0.93 for purification reaction, the reaction Generate 106.06kg of calcium chloride-based solution, filter with suction filter 1-2, burn or bury the insoluble filter cake impurities, and add 141.06kg of pure calcium chloride in the clarified calcium chloride filtrate to the original solution to clarify Calcium chloride solution, then put into synthesizer 3 with sulfuric acid according to the mass ratio of pure substance 1: 1.08 to carry out synthesis reaction, the reaction generates the mixed solution of calcium sulfate dihydrate and hydrochloric acid, and the reaction product is carried out with suction filter 2 4 Suction filtration, the white filter cake obtained by suction filtr...

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Abstract

The invention belongs to the technical field of treatment and utilization of three wastes in the chemical industry, and particularly discloses a method for preparing anhydrous calcium sulfate to co-produce industrial hydrochloric acid by using pure alkali distilled waste liquid. The invention has the main technical scheme that: the pure alkali distilled waste liquid reacts with the hydrochloric acid to obtain solution mainly containing calcium chloride, synthetic reaction and filtration are carried out on the obtained solution and sulfuric acid to obtain dihydrate calcium sulfate, calcination is carried out on the dihydrate calcium sulfate to obtain the anhydrous calcium sulfate, and filtrate is decompressed and distilled to obtain 25%-30% industrial hydrochloric acid. In the method, not only is the distilled waste liquid of the pure alkali industry effectively treated, industrial pollution is eliminated, but also the distilled waste liquid can be modified into anhydrous calcium sulfate and industrial hydrochloric acid products with economic value, the production technology and equipment thereof are simple and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical waste treatment and comprehensive utilization, in particular to a method for preparing anhydrous calcium sulfate and co-producing industrial hydrochloric acid with soda ash distillation waste liquid. technical background [0002] The ammonia distillation process in the soda ash industry is an important operation unit in the ammonia-soda method. The biggest disadvantage of this unit is that a large amount of ammonia distillation waste liquid needs to be removed during the ammonia distillation process. If this waste liquid is not properly treated and discharged at will, it will cause considerable pollution to the natural environment. Therefore, the treatment and utilization of ammonia distillation waste liquid by the ammonia-alkali method is also an important step in the soda ash industry. [0003] Chinese patent literature, the application number is 200810129372.9, which discloses a meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46C01B7/03
Inventor 王嘉兴
Owner 汪晋强
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