(东北大学 材料与冶金学院，沈阳 110004)
摘 要: 对含砷类型不同的金精矿和单矿物进行细菌氧化−氰化浸出研究，分析毒砂和雄黄对金精矿细菌氧化−氰化浸出效果的影响。结果表明：在细菌氧化过程中，含砷金精矿中的毒砂易被氧化分解，经过192 h的细菌氧化后，脱砷率可达93.10%；而雄黄无法被细菌氧化分解，且影响细菌活性，延长浸矿的停滞期；在氰化浸出过程中，毒砂非常稳定，不参与任何副反应；而雄黄易与CN−及保护碱发生副反应，且产生的沉淀物质会在金粒表面形成薄膜，从而降低氰化浸出效率。
关键字: 雄黄；毒砂；细菌氧化；氰化浸出
gold concentrates with different arsenic types
（School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China）
Abstract:The biooxidation and cyanidation leaching of gold concentrates and monominerals with different arsenic types were studied. The effects of arsenopyrite and realgar on the biooxidation and cyanidation leaching of gold concentrate were investigated. The results show that arsenopyrite in the arsenic-bearing gold concentrate is easily oxidized and decomposed. The dearsenification rate rises up to 93.10% after 192 h biooxidation. On the contrary, realgar cannot be biooxidated, which restrains the growth of bacteria and extends the lag phase. In the process of cyanidation leaching, arsenopyrite is very stable and does not participate in any side reactions, conversely, realgar participates in the side reactions with cyanide and alkali. The efficiency of cyanidation leaching is depressed because the precipitates produced form the film on the surface of gold grain in the process of cyanidation leaching.
Key words: realgar; arsenopyrite; biooxidation; cyanidation leaching
