Process for preparing barium chloride and calcium chloride by utilizing chlor-alkali waste salt sludge

Abstract

The invention relates to a process for preparing barium chloride and calcium chloride by utilizing chlor-alkali waste salt sludge. In the process, barium chloride is prepared from waste salt sludge, wherein the main component (barium sulfate) of the salt sludge, raw coal, a fluxing agent and the barium sulfate are further calcined at the high temperature of 600-1000 DEG C so as to generate barium chloride and CaS melts. The process has the advantages of solving the problems that the production process of a barium sulfate method is complicated, barium sulfate raw materials are expensive, the product cost is high, and the application range of the product is limited, and also solving the problem of restricted continuous production caused by gradual reduction of witherite raw materials in a witherite method.

Description

technical field [0001] The invention belongs to the field of chlor-alkali production technology, and relates to the application of waste chlor-alkali salt mud, in particular to a process for preparing barium chloride and calcium chloride by using waste chlor-alkali salt mud. Background technique [0002] my country is a big country in the production and use of barium chloride, and it is also one of the countries that produced barium chloride earlier in the world. The production of barium salt in my country has reached the international advanced level in terms of output, quality and technology, and has become a veritable national standard. Barium salt producing country. There are two methods for producing barium chloride in my country. One is the barium sulfide method, which uses hydrochloric acid and barium sulfide as raw materials for metathesis reaction to generate barium chloride solution, and then the barium chloride solution is filtered, and the filtrate is passe...

AI Technical Summary

Problems solved by technology

Before the 1980s, due to the lack of witherite ore resources and the immaturity of barium chloride technology by acidification method, the production process of barium chloride production enterprises was mainly based on barium sulfide method, but the production process of barium sulfide method was complicated and the raw materials were relatively expensive , the hydrogen sulfide produced by it must also be absorbed by liquid caustic soda to produce sodium hydrogen sulfide or other products, and the production cost of the product is high, which limits the application range of the product

Its production level and technical equipment are relatively mature, but there are no relevant reports on the comprehensive utilization of salt mud to produce barium chloride

[0003] At present, the national caustic soda industry is developing rapidly. Taking Xinjiang Zhongtai Chemical Industry as an example, the annual output of caustic soda is 370,000 tons, while a large amount of salt mud waste produced during the preparation of caustic soda is accumulated. According to the information, the annual output of caustic soda is 100,000 tons. More than 7,000 tons of salt mud can be discharged, so Zhongtai Chemical can discharge nearly 28,000 tons of salt mud every year, which causes serious environmental pollution and waste of resources. Therefore, the recovery and treatment of salt mud has become an urgent problem to be solved in the caustic soda industry

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