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 hydrometallurgy technology, in particular to an extraction and separation method for recovering main impurities in indium by using a hydrochloric acid system for removing impurities from the acidic leaching solution of indium. 【Background technique】 [0002] Explanation of terms: TBP (tributyl phosphate)-P204 ( Di-(2-ethylhexyl) phosphoric acid ) combined extraction technology: refers to the use of TBP high-acid extraction, low-acid stripping and P204 low-acid extraction, high-acid stripping characteristics, using 60% TBP + 40% sulfonated kerosene in a hydrochloric acid system of about 4M to extract indium Extraction, and then back-extraction with 0.5M dilute hydrochloric acid to achieve the purpose of initially enriching and separating most of copper, cadmium, lead and other metals. After adjusting the pH of the stripping solution to 0.5-1.5 by adding sodium hydroxide, extract indium with 30% P204 + 70% ...

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-immersion supernatant discharged from the zinc extraction process, remove suspended matter, and then indium-iron Extraction and separation, back extraction of indium from the organic phase, the indium water is replaced by zinc sheets to obtain sponge indium; the indium-poor phase of the stripped indium is sent to the stripped iron, and the iron-poor phase obtained is washed with chlorine, and the organic phase after washing with chlorine Returning to the extraction process for reuse, the disadvantage is that the sponge indium is replaced by the zinc sheet, and the cost is high