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Copper Anode Slime

     

Sulfating Roasting-Selenium Distillation-Hydrometallurgical Treatment Process

Its main features are as follows:

(1) The copper-removed residue is processed via the "ammonia leaching - hydrazine hydrate reduction" route to produce silver powder;

(2) The silver-removed residue is treated using the "sodium cyanide leaching for gold - sulfur dioxide reduction" process to obtain gold powder;

(3) Lead is separated with nitric acid. This process addresses the issue of severe lead pollution.

Low-Temperature Oxidizing Roasting-Hydrometallurgical Treatment Process

Its main features are:

(1) Cu, Se and Te are separated with dilute sulfuric acid;

(2) Sodium sulfite (Na₂SO₃) leaching is adopted to replace ammonia leaching for silver extraction, optimizing the operating environment;

(3) Short production cycle and fast capital turnover;

(4) Elimination of lead hazards;

(5) High direct recovery rates of gold and silver, reaching 98.5% and 96% respectively.

Total Hydrometallurgical Treatment Process

This process uses dilute acid oxidative leaching to extract Se and Te. To prevent the dissolution of Au, Pt and Pd, the potential of the leaching process must be controlled. Finally, high-potential leaching is applied to extract Au, Pt and Pd. The chlorinated residue is leached with ammonia or sodium sulfite (Na₂SO₃) and then reduced to obtain crude silver powder. The crude gold and silver powders can be further purified by electrolysis.

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