TECHNOLOGY OF EXTRACTION OF GOLD FROM GOLDEN COAT ON SUBSTRATE OF COPPER OR ITS ALLOY

摘要

electrolytic extraction of gold from scrap of electron and electrical articles with substrates of copper or its alloy. SUBSTANCE: golden coat is subjected to electrolytic solution in single-component electrolyte containing sulfuric acid with concentration of 93.5-95.5 per cent by mass with starting voltage 3.0-4.0 V at room temperature. Precipitate of hydroxide of trivalent gold formed in process of electrolysis is separated from electrolyte by centrifugation and is calcined at temperature of 200-300 C with winning of metal gold. Given technology produces result consisting in winning of metal gold with purity not less than 99.8 per cent by mass and in extraction of 99.1-99.2 % of gold. EFFECT: improved efficiency of proposed technology. 3 cl