(東北大學(xué) 材料與冶金學(xué)院，沈陽 110004)
摘 要: 對(duì)含砷類型不同的金精礦和單礦物進(jìn)行細(xì)菌氧化−氰化浸出研究，分析毒砂和雄黃對(duì)金精礦細(xì)菌氧化−氰化浸出效果的影響。結(jié)果表明：在細(xì)菌氧化過程中，含砷金精礦中的毒砂易被氧化分解，經(jīng)過192 h的細(xì)菌氧化后，脫砷率可達(dá)93.10%；而雄黃無法被細(xì)菌氧化分解，且影響細(xì)菌活性，延長(zhǎng)浸礦的停滯期；在氰化浸出過程中，毒砂非常穩(wěn)定，不參與任何副反應(yīng)；而雄黃易與CN−及保護(hù)堿發(fā)生副反應(yīng)，且產(chǎn)生的沉淀物質(zhì)會(huì)在金粒表面形成薄膜，從而降低氰化浸出效率。
關(guān)鍵字: 雄黃；毒砂；細(xì)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
