A kind of method for removing chlorine from acid solution

Abstract

The invention discloses a method for removing chlorine in an acidic solution. The method comprises adding a chlorine removing agent into an acidic solution containing chlorine and reacting to remove chlorine, obtaining a chlorine removal residue and a chlorine removal liquid, stirring and regenerating the chlorine removal residue with lye And get the residual lye, after dechlorination, use the adsorption material to reclaim the dechlorination agent element remaining therein, after the adsorption is saturated, use the eluent to regenerate, the regenerated adsorption material is recycled, and the obtained eluting rich solution is used in the residual lye And, reclaim bismuth oxychloride slag and / or antimony oxychloride slag and chloride salt solution. The method of the present invention has high chlorine removal efficiency under the chlorine-containing acidic solution system, and can recycle the antimony-bismuth dissolved in the chlorine-removed liquid at low cost and recycle the antimony-bismuth element in a low-cost manner without adding to the stock solution. The introduction of other ingredients only requires a small amount of lye and hydrochloric acid, and the entire system can be circulated through a simple process. The entire process is simple, almost no waste water is generated, and the treatment cost is low.

Description

technical field [0001] The invention belongs to the technical field of acid solution treatment and reuse, and in particular relates to a method for removing chlorine from an acid solution. Background technique [0002] In metallurgy, chemical industry, surface treatment and other fields, there are various acidic solutions containing fluorine and chlorine plasma that need to be treated. Especially in the metallurgical industry, there is a large amount of dirty acid containing fluorine and chlorine in the process of purifying sulfur dioxide flue gas. If the sulfuric acid in the dirty acid needs to be recycled as a resource, the fluoride and chloride ions in the solution need to be removed. [0003] In the prior art, some processes adopt the method of concentrating and blowing off the polluted acid. In the high-temperature concentrated sulfuric acid solution, fluoride and chloride ions are blown out with hydrogen fluoride and hydrogen chloride gas, and then absorbed with lye. ...

AI Technical Summary

Problems solved by technology

Some literature discloses the method for adsorbing and removing chlorine from strong acid solution. This method also uses antimony to remove chlorine. Precipitation of tetravalent antimony to recover the antimony remaining in the solution, but the chlorine removal effect of this method is not very good, the residual amount of antimony is high, and at the same time, because it needs to consume several times antimony pentoxide, the treatment cost is also high

[0005] Therefore, in a sulfuric acid system with a sulfuric acid concentration of about 5% or even higher, the technical difficulty of using antimony-bismuth to remove chlorine lies in how to recover the antimony-bismuth dissolved in the chlorine-removed liquid at low cost, and how the antimony-bismuth element How to recycle cheaply

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