Abstract: A gold concentrate is very difficult to be cyanide leached out because of the fine disseminated grain size and wrapped by sulfide of gold mineral. So taking the hydrogen peroxide as oxidizer, carried out the oxidation pretreatment to the gold concentrate and determined the suitable conditions: grinding fineness at -48 μm 90%, pulp density at 40 g/L, stirring speed at 200 r/min, reaction temperature at 50 ℃, dosage of sulphuric acid at 0.7 mol/L, dosage of hydrogen peroxide at 0.3 mol/L, reaction time at 8 h. After oxidation pretreatment to gold concentrate, the leaching rate of cyanide leached gold increases from 51.6% to 78.3%.

Key words: Refractory gold concentrate, Oxidation pretreatment, H₂O₂, Dissolution rate