Method for leaching gold from gold ore containing pyrite

摘要

The present invention provides a method for leaching gold from gold ore containing pyrite. There is provided A method for leaching gold comprising: a pretreatment stage including: a step 1 of preparing gold ore containing pyrite and a step 2 of heating the gold ore under an inert atmosphere to 450'C or more to pyrolyze the pyrite in the ore into iron (II) sulfide and elemental sulfur; a solid-liquid separation step 3 of contacting the pretreated gold ore with an iron-leaching solution containing one or more selected from sulfuric acid, hydrochloric acid and an aqueous Fe> salt solution to leach iron component contained in the ore, and thereafter subjecting the resulting solution to a solid-liquid separation to obtain post iron-leaching solution and residue; a leaching step 4 of contacting the residue from the step 3 with a gold-leaching solution containing halide ions, copper ions, and iron ions while supplying an oxidizing agent, to leach gold component contained in the residue; and an iron-leaching solution regeneration step 5 of precipitating and removing the iron component from the post iron-leaching solution obtained in step 3 as a form of oxyiron hydroxide.