Overview of recovery of gold and silver from silver-zinc shells

Silver zinc can lead Fire refining is an intermediate product in addition to silver and zinc. The factory that produces bismuth also adds zinc and silver to produce silver-zinc shells during the refining process.

Zinc has a strong affinity for gold and silver. When refined lead or refining bismuth, metal zinc powder is added to molten lead (or bismuth) solution, and gold and silver contained in crude lead (or coarse bismuth) are easily combined with zinc to form A zinc-silver-gold alloy that is small in density and insoluble in lead (or bismuth) liquid floats on the surface of the metal. This scum is called a silver-zinc shell. The silver content in crude lead or crude is 10 times higher than the gold content. The affinity of zinc to gold is greater than that of silver. The gold enters the silver-zinc shell first, so the silver-zinc shell also contains gold.

Commonly used in the distillation and zinc removal process to extract gold and silver from silver-zinc shells, some plants use some new processes.

This paper mainly includes four parts. 1. Recovering gold from silver-zinc shell by distillation and zinc removal method; 2. Removal of lead and layered precipitation enrichment and electrolysis of carnallite by silver-zinc shell; 3. Lead-rich ash blowing Law; 4, lead poisoning protection and treatment. Please refer to the relevant title of this website for details of each part.