Pre-oxidation of Pyrite in Refractory Gold Ore Using MnO2 as Oxidant
1 he paper focused on the acid leaching technology of pyrite and pyrolusite,leaching parameters like H2SO4 concentration,mass ratio of pyrite and pyrolusite,reaction time,liquid to solid ratio,and reaction temperature were investigated,and the most suitable leaching condition was determined.On this basis,the experimental study on pre-oxidation-cyanide leaching of the flotation gold concentrate from a refractory gold mine in Gansu province was carried out.The results showed that under the parameters of mass ratio of pyrite and pyrolusite was 1∶6,H2SO4 concentration was 100 g/L,liquid to solid ratio was 6,reaction temperature was 90 ℃,and the leaching time was 12 h,Mn extraction rate of 76.0％was achieved.Meanwhile,the oxidation rate of pyrite can reach 88.2％,and 85.4％gold leaching rate was obtained after cyanidation of pre-oxidized residue.
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