System and method for treating chlor-alkali production byproduct salt mud

A treatment system and by-product salt technology, applied in the direction of carbonate preparations, calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve the problems of unfavorable environmental protection, waste of transportation costs, etc., to alleviate environmental protection The effect of pressure, less impurities, and high calcium carbonate content

Active Publication Date: 2015-12-09
YIBIN HAIFENG HERUI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the salt mud is generally used for filling depressions, paving roads, etc., or the salt mud and ammonia distillation waste liquid are discharged to the slag yard for mixed treatment, and then press-filtered into cakes and transported away for accumulation, which is not conducive to environmental protection and wastes transportation costs.

Method used

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  • System and method for treating chlor-alkali production byproduct salt mud
  • System and method for treating chlor-alkali production byproduct salt mud
  • System and method for treating chlor-alkali production byproduct salt mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Feed the calcium carbonate salt mud into the reaction kettle through the belt conveyor, and use the hydrochloric acid barrel to input the hydrochloric acid with a concentration of 22%-29% into the reaction kettle and stir with the salt mud in it for 2 hours, and control the pH value of the reaction 1~4;

[0036] (2) Add caustic soda with a concentration of 12%-20% into the circulation tank, and the caustic soda enters the absorption tower through the circulation pump, and the CO produced after the reaction in step (1) 2 The gas enters the absorption tower and reacts with caustic soda to produce soda ash solution. After the reaction of the gas in the absorption tower is completed, the liquid in the absorption tower is returned to the circulation tank to obtain caustic soda-soda ash solution for brine refining process, wherein the content of soda ash in the mixed solution is 200 ~260g / L;

[0037] (3) Add caustic soda with a concentration of 12%-20% to the reaction ke...

Embodiment 2

[0040] (1) Feed the calcium carbonate salt mud into the reaction kettle through the belt conveyor, and use the hydrochloric acid bucket to input the hydrochloric acid with a concentration of 22%-29% into the reaction kettle to stir and react with the salt mud in it for 3 hours, and control the pH value of the reaction 1;

[0041] (2) Add caustic soda with a concentration of 12%-20% into the circulation tank, and the caustic soda enters the absorption tower through the circulation pump, and the CO produced after the reaction in step (1) 2 The gas enters the absorption tower and reacts with caustic soda to produce soda ash solution. After the reaction of the gas in the absorption tower is completed, the liquid in the absorption tower is returned to the circulation tank to obtain caustic soda-soda ash solution for brine refining process, wherein the content of soda ash in the mixed solution is 15 %-20%;

[0042] (3) Add caustic soda with a concentration of 12%-20% to the reactio...

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Abstract

The present invention discloses a system and a method for treating a chlor-alkali production byproduct salt mud. According to the present invention, through the system, chlor-alkali calcium carbonate salt mud is treated with hydrochloric acid to remove carbonate ions, the generated carbon dioxide is conveyed into an absorption tower and reacts with caustic soda to generate soda ash for salt water refining, the pH value of the solution can be adjusted by adding the caustic soda, acid insoluble substances and magnesium ions are precipitated, pressure filtration is performed to obtain a calcium chloride clear liquid, the calcium chloride clear liquid can be used as the refrigerant of the membrane method nitrate removal refrigeration unit and can be used for export, and in the waste residue obtained after the pressure filtration, the acid insoluble substance residue is conveyed to the cement plant, and the magnesium hydroxide is subjected to high temperature calcination to obtain magnesium oxide so as to achieve the zero emission of pollutants.

Description

technical field [0001] The invention relates to a treatment system and method for chlor-alkali calcium carbonate mud, belonging to the technical field of chlor-alkali production industry. Background technique [0002] In industry, caustic soda, chlorine and hydrogen are produced by electrolysis of saturated NaCl solution, and a series of chemical products are produced using them as raw materials, which is called the chlor-alkali industry. In the process of producing caustic soda by electrolysis, the main raw material used is brine. Because the raw brine contains impurities, it is necessary to refine and remove impurities from the raw brine. Chlor-alkali salt mud is the waste produced by chlor-alkali enterprises during the brine refining process. [0003] The 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+ , SO4 2- , Fe 2+ , Fe 3+ 、Al 3+ and quartz sand. Mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/07C01G49/02C01F5/08C01F11/28
Inventor 胡忠铭尹健刘静毛焱明罗登彦
Owner YIBIN HAIFENG HERUI
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