Method for preparing calcium chloride through carbide slag and hydrochloric acid

A technology of calcium chloride and calcium carbide slag, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve the problems of low calcium chloride yield and large environmental pollution, and reduce environmental pollution. problems, improve utilization, and reduce the effect of recycling processing costs

Inactive Publication Date: 2013-09-18
SICHUAN PROVINCE JINLU RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the invention of the present invention is: for the above-mentioned existing problems, provide a kind of method that utilizes calcium carbide slag and by-product hydrochloric acid to produce calcium chloride, to solve the low yield of calcium chloride in the existing production technology, produce the salt mud of gained Calcium chloride has the disadvantage of large environmental pollution, in order to reduce production costs and improve the environmental protection of production

Method used

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Comparison scheme
Effect test

Embodiment 1

[0020] In the method for producing calcium chloride by utilizing calcium carbide slag and hydrochloric acid of the present invention, an excessive concentration of 28% hydrochloric acid and calcium carbide slag is sent into the reactor for reaction, and calcium oxide is used to adjust the pH value of the reaction solution to 7.5 after the reaction is completed. Then the reaction solution is filtered to obtain refined calcium chloride brine and calcium chloride salt mud. The calcium chloride brine is used to produce calcium chloride, and the moisture content of the filtered calcium chloride salt mud is 30%. Calcium salt mud is washed once with water and filtered, and the calcium chloride content in the wet solution of solid salt mud obtained by filtering is controlled to be 4%, and the obtained clear liquid containing calcium chloride light brine is used as an absorption liquid to absorb hydrogen chloride in the production of hydrogen chloride Gas, to produce hydrochloric acid c...

Embodiment 2

[0022] In the method for producing calcium chloride by utilizing carbide slag and hydrochloric acid of the present invention, an excessive concentration of 29% hydrochloric acid and calcium carbide slag is sent into the reactor for reaction, and calcium oxide is used to adjust the pH value of the reaction solution to 9.0 after the reaction is completed. The reaction solution is filtered to obtain refined calcium chloride brine and calcium chloride salt mud, and the calcium chloride brine can be directly sent to the next process as a raw material for use, and the moisture content of the filtered calcium chloride salt mud is 33%. Add water to the calcium chloride salt mud to wash and filter once, control the calcium chloride content in the wet solution of the filtered solid salt mud to 3%, and the obtained clear liquid containing calcium chloride light brine is used as the absorption liquid to absorb polyvinyl chloride The by-product hydrogen chloride gas produced by the monomer...

Embodiment 3

[0024] In the method for preparing calcium chloride by utilizing calcium carbide slag and hydrochloric acid of the present invention, the hydrochloric acid and calcium carbide slag with a concentration of 30% are sent into the reactor for reaction, and after the reaction is completed, the pH value of the reaction solution is adjusted to 11 with calcium oxide, and then the The reaction solution is filtered to obtain refined calcium chloride brine and calcium chloride salt mud. The calcium chloride brine is used to produce calcium chloride, and the moisture content of the filtered calcium chloride salt mud is 35%. The mud is washed twice with water and filtered, and the calcium chloride content in the wet solution of the filtered solid salt mud is controlled to be 1%, and the obtained clear liquid containing calcium chloride light brine is used as an absorption liquid to absorb hydrogen chloride gas in the production of synthetic hydrogen chloride , to produce hydrochloric acid c...

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PUM

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Abstract

The invention discloses a method for preparing calcium chloride through carbide slag and hydrochloric acid, and belongs to the technical field of chlor-alkali production. The method comprises the following steps of: reacting hydrochloric acid with carbide slag; filtering to obtain refined calcium chloride brine and calcium chloride brine sludge; washing the calcium chloride brine sludge with water; filtering; preparing hydrochloric acid by the obtained calcium chloride freshwater salt absorbing hydrogen chloride; and preparing calcium chloride through calcium-chloride-containing hydrochloric acid instead of part of hydrochloric acid. According to the method for preparing calcium chloride through the carbide slag and hydrochloric acid, the calcium chloride brine sludge is washed with water in order to recover the calcium chloride; the recovery rate of the calcium chloride under such method can reach 96% compared with the traditional process with the recovery rate of the calcium chloride of 70%; the production cost can be effectively decreased; the calcium chloride content in the brine sludge is greatly decreased through the washing, so that the influence of the loss of calcium chloride to the surrounding environment is reduced. The byproduct naming hydrogen chloride is fully consumed during recovering the calcium chloride, so that the production capacity of a chlor-alkali production is also improved.

Description

technical field [0001] The invention relates to a method for producing calcium chloride, in particular to a method for producing calcium chloride by using calcium carbide slag and by-product hydrochloric acid, which belongs to the technical field of chlor-alkali production. Background technique [0002] In the production of the chlor-alkali industry, the chlorine-consuming products chosen by most enterprises are hydrochloric acid or polyvinyl chloride resin. According to statistics from China Chlor-Alkali Network, by the end of 2011, the national production capacity of polyvinyl chloride resin had reached 26.13 million tons. In the process of synthesizing hydrogen chloride gas and synthesizing polyvinyl chloride monomer, a large amount of hydrochloric acid will be produced by-product, and hydrochloric acid is a hazardous chemical, and its storage, sale, and transportation are strictly controlled by the state. At the same time, a large amount of calcium carbide slag will be p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/24
Inventor 尹毕辉张宇宴伟
Owner SICHUAN PROVINCE JINLU RESIN
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