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采用经长期驯化耐砷的氧化亚铁硫杆菌SH -T菌株对某高砷金精矿进行氧化预处理。金精矿中有害杂质砷的含量达 17 7%～ 2 5 8% ,金属硫化物以毒砂为主 ,含量达 6 0 %～ 70 %。金以次显微状赋存于毒砂和黄铁矿之中。采用常规氰化工艺金的浸出率还不到 3%。金精矿经细菌氧化处理后 ,取得了较好的脱砷效果。矿浆浓度为 5 % ,经 13天的细菌氧化试验脱砷率可达 90 %以上。与常规氰化工艺相比 ,经 7天细菌氧化金浸出率提高 2 6倍之多
Oxidative pretreatment of a high-arsenic gold concentrate was carried out using the long-term domesticated arsenic-tolerant strain of Thiobacillus ferrooxidans SH-T. The content of arsenic in the gold concentrate is as high as 17.7% ~ 25.8%. The metal sulfide is mainly arsenopyrite with a content of 60% ~ 70%. Gold sub-micro-occurrence in arsenopyrite and pyrite. Conventional cyanidation gold leaching rate of less than 3%. Gold concentrate after bacterial oxidation, and achieved a better arsenic removal effect. Pulp concentration of 5%, after 13 days of bacterial oxidation test arsenic removal rate of up to 90%. Compared with the conventional cyanidation process, the leaching rate of bacterial oxidized gold increased by 26 times after 7 days