METHOD OF RECOVERING GOLD FROM GOLD ORES CONTAINING PYRITE

摘要

This method for recovering gold from gold ore containing pyrite comprises: a pretreatment step which includes a first step in which gold ore containing pyrite is prepared and a second step in which the gold ore is heated to a temperature of at least 450°C in an inert atmosphere, and the pyrite in the gold ore is pyrolyzed into iron sulfide (II) and elemental sulfur, and which does not contain an oxidizing roasting step; a third step in which gold ore having been subjected to the pretreatment step is brought into contact with gold leaching solution containing chloride ions, bromide ions, and iron ions while being supplied with an oxidizing agent, thereby leaching out the gold component in the ore; a fourth step in which, after adding to the solution obtained by leaching the gold component in step 3, an oxidizing agent is added to adjust the redox potential to at least 520mV, reducing the quantity of monovalent copper ions in the gold leachate; and a fifth step in which the gold in the gold leachate obtained in the fourth step is adsorbed by activated carbon.