通过控制生物浸出试验中软锰矿用量、过程pH和细菌接菌量等条件，对添加软锰矿强化复杂难选冶含砷金矿的生物氧化过程进行研究。结果表明，添加软锰矿可以缩短含砷金矿的生物氧化时间，砷的浸出率达到94.4%。反应过程中实现了含砷金矿中砷黄铁矿氧化的同时，软锰矿中锰元素高效浸出。生物浸出渣的氰化浸出实验结果表明，经软锰矿强化生物氧化后，生物浸出渣中金的氰化浸出率达到95.8%。生物浸出过程中，添加软锰矿能提高生物浸出溶液的氧化还原电位，从而促进生物氧化过程，且添加软锰矿后生物浸出过程中存在两种不同的反应方式。
Pyrolusite was added in the bioleaching process to enhance the bio-oxidation process. Bioleaching tests at different dosages of pyrolusite ore, pH and inoculation amounts of Acidithiobacillus ferrooxidans were studied. The results showed that the time of the bio-oxidation process was decreased obviously and the arsenic leaching rate reached 94.4%after the bioleaching. The bio-oxidation of arsenopyrite and the effective extraction of manganese from pyrolusite were achieved by the bioleaching process. After bioleaching, the leaching rate of gold from the reaction residues reached 95.8% by cyanide leaching. In the bio-oxidation process, pyrolusite increased the redox potential of the solution to accelerate the bioleaching rate. The experiment showed that there were two reaction modes in the bioleaching process.
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