Method for refining indium reverse extraction liquid and gathering valuable metal and application

Abstract

The invention provides a method for refining indium reverse extraction liquid and gathering valuable metal. The method for refining the indium reverse extraction liquid and gathering the valuable metal includes the steps that A, a neutralizing agent is added to the indium reverse extraction liquid and stirred so as to be dissolved; B, a reducing agent is added to a neutralized solution, and AsO33-, Bi3+, Cu2+, Sn4+ and Sn2+ in the solution are reduced into As, Bi, Cu, Sn and other valuable metal; and C, filtration is performed, so that purified liquid and purified residues are obtained. By the adoption of the method for separating and gathering the valuable metal existing in the indium reverse extraction liquid in the form of the impurity element and refining the indium reverse extraction liquid, the impurities such as arsenic, copper, bismuth and tin in the indium reverse extraction liquid can be separated and gathered into the metal so as to be recycled conveniently, consumption of zinc sheets in a replacement process is reduced, and conditions are provided for one-time qualification of the precipitated indium impurity generated by following electrolysis refinement. Meanwhile, the method for refining the indium reverse extraction liquid and gathering the valuable metal is simple in process, convenient to operate and low in production cost.

Description

technical field [0001] The invention relates to the technical field of recovering indium in a zinc hydrometallurgy process, in particular to a method for upgrading indium stripping solution and enriching valuable metals. Background technique [0002] With the increasingly scarce indium resources, the composition of indium recycling raw materials is becoming more and more complex, and the impurity content is also rising, which puts forward higher requirements for indium recycling technology. Usually the recovery of indium adopts the extraction method. The extraction and recovery process of indium is generally: extraction of indium-containing material liquid, pickling, and stripping to obtain the stripping liquid. The lean organic phase is regenerated and returned for re-extraction, and the indium stripping liquid is then purified. , to obtain a purification solution, and the purification solution is then processed to obtain refined indium through conventional replacement, com...

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Problems solved by technology

[0003] The commonly used method for removing impurities in the indium stripping solution in the prior art is to use zinc powder or indium sponge to remove impurities in the indium stripping solution under the conditions of sufficient stirring and a purification temperature of 50-85°C. High acid content and high impurity content, this method can theoretically separate and enrich valuable metals such as bismuth and tin, but in fact, if the purification agent sponge indium or the sponge indium or zinc powder obtained by replacement is used as a reducing agent to remove impurities When removing, because the above-mentioned reducing agent has a large surface area, a loose structure, is easy to form agglomerates, and has a smooth surface, after the replacement reaction has been carried out for a period of time, it is prevented from further replacement reactions, and the efficiency and direct recovery of indium replacement are low. The consumption of zinc powder and sponge indium is large, which increases the production cost. At the same time, this method requires special heating equipment, and under high acid and high temperature conditions, the replaced tin is easy to redissolve, making the purification incomplete

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