The removal of metallic impurities from off-grade
copper concentrate was investigated in alkaline solution with H2O2.
The analysis results of XRD and SEM-EDS revealed the oxidative mechanisms of all
sulfides. The influence of various parameters of alkaline leaching were
investigated including concentrations of sodium hydroxide and hydrogen
peroxide, liquid to solid ratio, leaching time and temperature. The results
showed that the removal rate of Mo, As and Zn were increased with increasing
leaching time and H2O2 concentration, and that the
removal rate of Mo, As and Zn were firstly increased and then slightly
decreased with increasing liquid to solid ratio, temperature and NaOH concentration,
respectively. More than 95% Mo, 94% As, and 94 % Zn are removed from the
off-grade concentrate under the optimum conditions, while only 1.7% Cu is
dissolved. These optimum conditions were sodium hydroxide 1.5mol/L, hydrogen peroxide 1.0 mol/L, temperature
50°C, liquid to solid ratio 5/1 mL/g and leaching time 5 h.
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