Research on pressure oxidation-iron alum decomposition-non-cyanide gold extraction of Carlin-type gold concentrate
A Carlin-type gold concentrate is a typical refractory gold concentrate,and most of the gold is encapsu-lated in pyrite and arsenopyrite,with a gold leaching rate of only 7.8%by direct leaching.In order to address the dif-ficult gold extraction and severe pollution caused by cyanide leaching in Carlin-type gold concentrate,a gold extraction method using pressure oxidation-iron alum decomposition-non-cyanide gold extraction was proposed.The encapsula-ted gold can be effectively dissociated after pre-treatment by pressure oxidation and iron alum decomposition.The gold leaching rates of oxygen pressure residue and alum destruction slag were 76.2%and 86.1%,respectively,under the following conditions:reaction time of 2 h,activated carbon dosage of 50 g/L,stirring speed of 400 r/min,temperature of 30℃,pH value of 1.3-1.5,air flow rate of 2 L/min,liquid-solid ratio of 4∶1,and thiourea dosage of 4 g/L.This method realizes efficient and clean extraction of Carlin-type refractory gold concentrate.
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