RECOVERY METHOD OF GOLD FROM SULFIDE MINERAL

摘要

PROBLEM TO BE SOLVED: To provide a recovery method of gold from sulfide mineral capable of enhancing separation efficiency of copper and gold.SOLUTION: There is provided a recovery method of gold from sulfide mineral comprising a process 1 of contacting a first acidic aqueous solution containing chloride ion, copper ion and iron ion and no bromine ion with sulfide ore under application of an oxidant to leach a copper component in the sulfide ore; a process 2 of separating the leaching reaction liquid obtained in the process 1 into a leach residue and a liquid after leaching by solid liquid separation; a process 3 of contacting a second acidic aqueous solution containing chlorine ion, bromine ion, copper ion and iron ion with the leach residue obtained in the process 2 under application of the oxidant to leach a gold component in the residue; a process 4 of adding the oxidant after adding cuprous chloride to the liquid after leaching gold obtained in the process 3, then adjusting the oxidation reduction potential at 520 mV or more to reduce monovalent copper ion in the liquid after leaching gold; and a process 5 of adsorbing gold in the liquid after leaching gold obtained in the process 4 to active charcoal.