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Gold-Bearing Waste

     

Process for Comprehensive Recovery of Precious and Rare Metals (Gold, Silver, Platinum and Palladium) from Gold-Bearing Waste

This process is implemented as follows:

Gold-bearing waste is first roasted in a rotary kiln, after which copper, bismuth and other impurities are leached out using sulfuric acid, industrial salt and sodium chlorate. Copper and bismuth in the primary leachate are recovered separately with caustic soda and soda ash.

The primary leaching residue is then leached with hydrochloric acid (or sulfuric acid) and sodium chlorate to obtain secondary leaching residue and a gold-, platinum- and palladium-bearing solution. Silver remains in the secondary leaching residue and is enriched therein.

After the pH of the gold-, platinum- and palladium-bearing solution is adjusted by adding soda ash, anhydrous sodium sulfite is dosed into the solution. Precipitation and filtration are then carried out to produce sponge gold and a platinum- and palladium-bearing solution.

Zinc powder is added to the platinum- and palladium-bearing solution, and platinum-palladium sludge and wastewater are obtained after further precipitation and filtration. Palladium powder and platinum powder are finally produced via conventional platinum and palladium extraction processes.

The present invention can address the common defects of traditional processes, including severe environmental pollution, low direct recovery rate, slow capital turnover and low labor productivity.

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