Method of recycling tellurium from anode mud

Abstract

A method of recycling tellurium from anode mud comprises the following steps: a) roasting; b) copper separation; c) gold separation; d) bismuth separation; and e) platinum and palladium separation: mixing bismuth separation residue in the step d) with sulfuric acid, controlling liquid-solid ratio to be 2:1-3:1 and the content of sulfuric acid in the liquid to be 190-210 g / L, stirring the mixture, and adding sodium chlorate to the bismuth separation residue until the bismuth separation residue is white after the bismuth separation residue is pulped, performing solid liquid separation to obtain a platinum and palladium separation residue and a platinum and palladium separation liquid, adding potassium chloride to the platinum and palladium separation liquid, controlling the content of the potassium chloride to be 45-55 g / L, and feeding chlorine to generate potassium chloroplatinate and potassium chloropalladite respectively from the platinum and palladium; and f) tellurium recovery: mixing the platinum and palladium separation residue in the step e) with water, controlling liquid-solid ratio to be 2:1-3:1, adding sodium hydroxide until the pH is 10-11, filtering the liquid, adding diluted sulfuric acid to a filtrate, controlling the pH to be 4.5-5.5 to generate tellurium dioxide, and reducing the tellurium dioxide to prepare tellurium. The method is simple and convenient, and is high in recovery rate and recovery purity of the tellurium.

Description

technical field [0001] The invention relates to anode slime smelting recovery technology, in particular to a method for recovering tellurium from anode slime. Background technique [0002] Anode slime is the residue accumulated from the deposits of the anode and cathode and the electrolyte flowing through the ditch after the electrolysis plant has been in operation for a long time. Anode slime is rich in precious metals, rare metals and other valuable metals. These metals occupy a very important position in the national economy. Extracting these metals from anode slime can obtain great economic benefits. For example, the benefits obtained from the treatment of copper anode slime are sufficient to cover the entire cost of copper electrolytic refining. Therefore, in order to reduce the cost of anode slime treatment, improve the treatment method, and increase the recovery rate of rare, precious metals or non-metallic elements, countries are studying treatment A new process for...

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Problems solved by technology

[0003] In the prior art, the Chinese invention patent application with the publication number CN103334013A discloses a leaching process for extracting precious metals from silver separation slag, but the similar direct leaching method is difficult to leaching and the progress of the process is slow