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 preventing reduction of the gold concentration in a liquid after leaching gold with the passage of time, and enhancing the adsorption amount of gold to active charcoal.SOLUTION: There is provided a recovery method of gold from sulfide mineral comprising a process 1 of contacting sulfide mineral or a leach residue after a leaching treatment to sulfide mineral with an acidic aqueous solution containing chlorine ion, bromine ion, copper ion and iron ion under application of an oxidant to leach a gold component in the leach residue; a process 2 of storing the liquid after leaching gold into which gold is leached while maintaining the bromine ion concentration at 40 g/L or more and the oxidation reduction potential at 500 mV (reference electrode is silver/silver chloride) or more; a process 3 of adding the oxidant after adding cuprous chloride to the liquid after leaching gold obtained in the process 2, 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 4 of adsorbing gold in the liquid after leaching gold obtained in the process 3 to active charcoal.