| The effects of temperature, retention time, oxygen partial pressure, pulp density and stirring speed were investigated separately in the acidic pressure pre-oxidation experiment with a refractory gold ore containing arsenopyrite. A good gold recovery (95.6%) was obtained under 210 ℃, retention time of 1.5 h, oxygen partial pressure of 700 kPa, pulp density of 20% and stirring speed of 800 r/min. The silver recovery was improved substantially after the silver-enhancement at 80~95 ℃. |