METHOD OF EXTRACTION OF COPPER AND GOLD FROM OXIDIZED ORES AND TECHNOGENIOUS WASTES Russian patent published in 2005 - IPC

FIELD: metallurgy of non-ferrous and noble metals.

SUBSTANCE: proposed method includes leaching-out metals from oxidized ores or technogenious wastes and extraction of metals from solutions followed by additional strengthening of depleted solutions with the aid of leaching-out agent. Leaching-out of copper is performed at several stages with the aid of solutions at increasing oxidizing/reducing potential; leaching-out of gold is combined with last stage of extraction of copper. The high efficiency of leaching-out of copper at initial stages is reached in presence of ferric iron; leaching-out of gold and last stage of extraction of copper are performed in presence of active chlorine or oxichlorides; copper and gold are extracted from solution by carburizing and gold is extracted by sorption. Depleted solution is brought to pH=4-5 before additional strengthening with leaching-out agent and is treated with oxygen-containing gas, air for example.

EFFECT: enhanced efficiency.

6 cl, 1 ex