Acid solution dechlorination method

Abstract

The invention discloses an acid solution dechlorination method. The acid solution dechlorination method comprises the following steps: adding a dechlorinating agent into a chlorine-containing acidic solution for reacting and dechlorinating so obtain a dechlorination residue and a dechlorinated liquid; stirring and regenerating the dechlorination residue with an alkali liquor to obtain a residual alkali liquor, recovering the residual dechlorinating agent component in the dechlorinated liquor by using an adsorbing material, and regenerating with an eluent after adsorption saturation; recyclinga regenerated adsorbing material, neutralizing an obtained eluent with the residual alkali liquor, and recovering bismuth oxychloride residues and / or antimony oxychloride residues and a chlorine saltsolution. The method comprises the following advantages: in the chlorine-containing acidic solution system, dechlorination efficiency is high, antimony bismuth dissolved in the dechlorinated liquid can be recycled at low cost, so that low cost circulation of antimony bismuth elements is realized; no other component is introduced into a stock solution, only a small amount the alkali liquor and hydrochloric acid are needed; the simple process is capable of realizing whole system circulation; the whole process is simple; almost no wastewater is generated; and 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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