| 摘要 |
In a process for leaching gold from gold ore containing pyrite, the speed of leaching gold is increased without use of toxic reagents such as cyanide, thiourea, thiosulfate and halogen gas, while suppressing generation of sulfur dioxide. The process comprises a pretreatment including step 1) of preparing gold ore containing pyrite and step 2) of heating the gold ore under a non-oxidative atmosphere to 450'C or more to pyrolyze the pyrite in the gold ore into iron (II) sulfide and elemental sulfur, wherein the pretreatment does not include roasting oxidation, and step 3) of contacting the pretreated gold ore with a gold leaching solution containing halide ions and iron ions while supplying an oxidant to leach gold component in the ore. |
