Purification method of electrolyte in indium electrolysis process

Abstract

A purification method of electrolyte in an indium electrolysis process comprises: (1) adding sulfuric acid solution with the concentration of 40 to 60 vt percent to indium electrolyte, and the indium concentration in indium electrolyte is 50 to 100 g / L, (2) dripping 0.5 to 1.5 mol / L soluble barium salt to the mixed solution, (3) filtering to obtain statically purified indium electrolyte, (4) heating the statically purified indium electrolyte to be evaporated to original volume, and (5) connecting the connecting pipes on the inlet and the outlet on the two opposite sides of a electrolytic bath, and connecting with a circulating pump and a sponge indium column on the pipe, wherein the sponge indium post is formed by arranging sponge indium in a fused silica column, the electrolyte which is statically purified, heated and evaluated is placed in the electrolytic bath and is circulated by the circulating pump during the whole electrolytic process, the electrolyte passes through the indium column through circulation for more times to purify the electrolyte, thus completing the dynamic purification of the electrolyte during the electrolysis process. The method of the invention is the method combining the static purification and the dynamic purification, purified the electrolyte, reduces the content of impurities of cadmium, tin, lead, bismuth, thallium and the like, and simplifies the work load of indium electrolysis.

Description

technical field [0001] The invention relates to a method for purifying electrolyte in an indium electrolysis process, which comprises two parts: static purification of primary electrolyte and dynamic purification during electrolysis. Background technique [0002] Materials such as semiconductors and thin-film solar cells have high requirements on the purity of metal indium, which generally must reach more than 99.999%, or even 99.9999%. At present, my country mainly produces crude indium and 99.99% refined indium, so the research and development of high-purity indium is an urgent problem to be solved. The preparation methods of high-purity indium mainly include chloride method, electrolytic refining method, vacuum distillation method, zone smelting method, etc. Among various purification technologies, electrolysis method is the most commonly used method for indium purification. There are many factors affecting the effect of indium electrolytic purification, among which the ...

AI Technical Summary

Problems solved by technology

However, during the electrolysis process, as the indium anode gradually dissolves, some impurities will also dissolve in the electrolyte, thereby contaminating the electrolyte, resulting in poor purification of indium in the later stage of electrolysis, so the effect of static purification of the electrolyte alone is limited. Moreover, if you want to reuse the electrolyte for another electrolysis after the first electrolysis, you need to perform static purification on it again.

Images