Method for directly electrolyzing indium strip liquor to extract metal indium

Abstract

The invention provides a method for directly electrolyzing indium strip liquor to extract metal indium. The method comprises the following steps that (1) a purified indium strip liquor solution and part of electrolytic waste liquor are mixed to obtain mixed liquor; and (2) the purified indium strip liquor solution or mixed liquor continuously enters an electrolytic cell from the liquor inlet end of the electrolytic cell, a graphite plate serves as an anode plate of the electrolytic cell, a titanium plate serves as a cathode plate of the electrolytic cell, and direct current is led to directlyextract anode indium. The provided metal indium electrolysis method completely solves the problem of generation of arsenic hydride, greatly improves the quality of the crude indium anode, and providesa high-quality raw material for further extraction of ITO-grade high-purity indium; the total cost of refined indium production is greatly reduced; the system is controllable, the scale can be largeor small, and the method is suitable for various indium production scales; the safety and environmental protection aspects are far higher than those of a replacement method; and the labor intensity isgreatly reduced.

Description

technical field [0001] The invention belongs to the field of rare metal metallurgy, and in particular relates to a method for directly electrolytically extracting metal indium from an indium stripping liquid. Background technique [0002] In the prior art, the metal zinc-aluminum replacement method is used in the indium stripping solution to produce crude indium, and this method is simple. But there is a huge safety risk. The highly toxic arsine is produced during the replacement process. Therefore, many workers in the replacement process are poisoned by arsine every year in the country, and a large amount of highly toxic arsine gas is discharged to the environment during the production process. , this production process is a common difficulty in indium production. And it is difficult to deal with the liquid after replacement. [0003] Trace amount of Pb in circulating fluid 2+ , Sn 2+ , Bi 3+ , Tl 2+ , Cd 2+ Due to concentration and In 3+ The difference is huge, in ...

AI Technical Summary

Problems solved by technology

But there is a huge safety risk. The highly toxic arsine is produced during the replacement process. Therefore, many workers in the replacement process are poisoned by arsine every year in the country, and a large amount of highly toxic arsine gas is discharged to the environment during the production process. , this production process is a common difficulty in indium production

Moreover, it is difficult to deal with the liquid after replacement

[0003] Trace amount of Pb in circulating fluid 2+ , Sn 2+ , Bi 3+ , Tl 2+ , Cd 2+ Due to concentration and In 3+ The difference is huge, in the process of competitive electrolysis, it is rarely precipitated in the cathode, so it is also a process of removing impurities in the electrolysis process, and the replacement method adopts strong reduction and non-selective removal of the above metals in order to improve the recovery rate as much as possible. All replacements are mixed into the sponge indium, resulting in a decline in the quality of crude indium, which generally only reaches 97-99%, and rarely exceeds 99.5%

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