Biological Pre-oxidation of Refractory Gold Ores Containing High As
The influence of pulp consistency,oxidation time,aeration quantity and pH value on biological pre-oxidation treatment of a refractory gold ores containing high As was investigated.The results indicate that the oxidation ratio of sulfide is 80.95% and the leaching rate of gold is 82.31% when the pulp consistency is 17%,oxidation time is 7 days,agitation speed is 300 rpm,temperature is 40 ℃,aeration quantity is 0.4m3·L-1·h-1,initial pH is 2.0,bacteria quantity is 10% and the pH value is not controlled during the process.The gold packed by sulfide in cyanide residue is 53.53% of total gold and harmful metal ions can be treated to meet standard requirement by neutralizing the waste fluid of oxidation.