Method for recovering indium from indium-containing material

Abstract

The invention discloses a method for recovering indium from an indium-containing material. The method comprises the following steps: (a) leaching: leaching the indium-containing material with hydrochloric acid under a heating condition by adding an oxidizing agent, and after leaching, adding a flocculant to clarify the precipitate and obtain a supernatant; (b) reduction: adding iron powder to the supernatant to reduce Fe<3+> in the supernatant; (c) system optimizing: adding a sufficient amount of a sulfate ion-containing reagent into the reduced indium-containing solution, so that the reduced indium-containing solution is optimized from a hydrochloric acid system into a sulfuric acid system; (d) extraction: extracting the indium-containing solution subjected to the system optimizing with a P204-containing organic phase to obtain an indium-containing organic phase; and (e) indium production: conducting reverse extraction and displacement on the indium-containing organic phase to obtain sponge indium, and conducting melt casting on the sponge indium to obtain crude indium. Due to adoption of the method disclosed by the invention, not only the high leaching rate in the leaching process, but also the extraction rate and the product quality of indium can be ensured.

Description

technical field [0001] The invention relates to the technical field of recovery of scattered metals, in particular to a method for recovering indium from materials containing indium. Background technique [0002] Indium is a scattered metal. There is no independent indium mine in nature. The global indium is basically associated with minerals such as zinc, lead, and tin, and is enriched in by-products during the smelting process of lead, zinc, and tin (collectively referred to as containing Indium material), the content of indium is generally 0.05~5%, and it also contains iron, zinc, lead, tin, cadmium, copper and other metal components. [0003] The currently commonly used indium extraction process is sulfuric acid leaching (solution removal of impurities) → P204 (dioctyl phosphate) extraction → stripping → replacement → melting and casting, but there is a problem that the leaching rate is not high when using this process. Through the analysis of indium-containing material...

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Problems solved by technology

[0016] In view of the low leaching rate existing in the current production process of indium-containing materials and the problems caused by the above-mentioned leaching with hydrochloric acid, the present invention proposes a solution for system optimization, by adding a sufficient amount of sulfate ions to the indium-containing solution, so that The indium-containing solution is optimized from the hydrochloric acid system to the sulfuric acid system to meet the subsequent extraction requirements and effectively control the lead content, thereby ensuring a high leaching rate during the leaching process and maintaining a high extraction rate of indium and product quality High advantages, completely solve the phenomenon of low leaching rate, low extraction rate and high impurity content in the current production process of indium-containing materials

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