PROCESS FOR RECOVERING GOLD, SILVER AND COPPER FROM SLAGS

摘要

The invention relates to a process for recovering gold, silver and copper from slags resulting from the melting process of the dore alloy obtained by the electrolysis of gold-silver containing cyanhydric eluates. The silver and the copper are solubilized, by leaching, in azotic acid. The silver from the solution is selectivelly precipitated as silver chloride and then it is reduced to sugar metal silver by means of sugar in alkaline environment. The copper from the nitrate solution is recovered by concentration on iron borings. The gold is leached by wet chlorination, purified by ion exchange and reduced by means of quinol to pure gold.