Biooxidation of high arsenic gold concentrate with arsenopyrite type

In this paper,contrast flask bacterial tests of high arsenic gold concentrate with arsenopyrite type and pure arsenopyrite mineral showed that the pyrite in the concentrate promoted the efficiency of dearsenication rate of the mineral,it was significantly higher than pure arsenopyrite.After 10 d and 15 d of bacterial oxidation of dearsenication,the final dearsenication rates of gold concentrate and arsenopyrite mineral were 93.90% and 64.45%,respectively.Microscope observation and XRD diffraction analysis of arsenopyrite oxide slag showed that arsenopyrite was covered with NH4Fe3(SO4)2(OH)6 which isolated arsenopyrite from its environment.This phenomenon eventually led to the slow oxidation rate of arsenopyrite and inadequate dearsenication effect.