Extraction and separation technology for reclaiming main impurity in indium in hydrochloric acid system

Abstract

The invention relates to technology for extracting and separating main impurities from indium with hydrochloric acid system. The acidity of the said leachate is adjusted by adding material or concentrated hydrochloric acid and adjusting to hydrochloric acid of 4+-0.3 mol / L, then filtrating. The said Ferric, tin and antimony is extracted with mixed extractant of 30%TBP+60%sulfonate kerosene +10%octyl alcohol. The said ferric is extracted by washing the organic phase with 1N hydrochloric acid solution. The said tin and antimony is extracted by adding little citric acid into 0.1 hydrochloric acid solution. The invention has good continuity, no loss of indium, can recover chloride ferric, tin, and antimony, reduces production cost, and improves operation environment.

Description

【Technical field】 [0001] The invention relates to a non-ferrous metal hydro-smelting technology, in particular to an extraction and separation technology for recovering main impurities in indium by using a hydrochloric acid system for removing impurities from an indium acid leach solution. 【Background technique】 [0002] Glossary: ​​TBP (tributyl phosphate)-P204 (di-(2-ethylhexyl) phosphoric acid) joint extraction technology: refers to the use of TBP high-acid extraction, low-acid stripping and P204 low-acid extraction, high-acid stripping Extraction characteristics, use 60% TBP + 40% sulfonated kerosene to extract indium in a hydrochloric acid system of about 4M, and then back-extract with 0.5M dilute hydrochloric acid to achieve preliminary enrichment and separation of most copper, cadmium, lead and other metals the goal of. After adjusting the pH of the stripping solution to 0.5-1.5 by adding sodium hydroxide, extract indium with 30% P204 + 70% sulfonated kerosene, and t...

AI Technical Summary

Problems solved by technology

[0003] In the existing high-concentration hydrochloric acid solution indium TBP-P204 joint extraction and recovery of indium technology, the ferric iron in the solution is reduced to ferrous iron by using iron filings or iron powder, and most of the tin, antimony and other metals Replace it to eliminate its interference to the extraction, but the solution generally contains a certain amount of arsenic, which will produce highly toxic arsine gas and acid mist after adding iron filings or iron powder, which will poison the health and safety of operators. Pollution of the environment, in addition, the consumption of a large amount of iron filings or iron powder will also cause an increase in production costs

[0004] Chinese patent application 87102083 discloses a process for recovering indium from high-indium-iron solution. The technical solution of this application is to pretreat the low-leaching supernatant discharged from the zinc extraction process, remove suspended matter, and then process indium-iron Extraction and separation, back extraction of indium from the organic phase, the indium water is replaced by a zinc sheet to obtain sponge indium; the indium-poor phase of the back-extracted indium is sent to the stripped iron, and the obtained iron-poor phase is washed with chlorine, and the organic phase after washing with chlorine The disadvantage of re-use in the extraction process is that the sponge indium is replaced by zinc flakes, and the cost is high