(1. 中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083；
2. 中南大學(xué) 戰(zhàn)略含鈣礦物資源清潔高效利用湖南省重點實驗室，長沙 410083)
摘 要: 在50 ℃、pH 1.6的條件下，研究了Fe2+、Fe3+和Cu2+對中等嗜熱混合菌浸出黃銅礦的影響。結(jié)果表明：添加低質(zhì)量濃度Fe2+時，在浸出前期能夠促進(jìn)黃銅礦的浸出；而添加較高質(zhì)量濃度Fe2+時，銅的浸出率反而降低；當(dāng)添加不同質(zhì)量濃度Fe3+時，由于形成黃鉀鐵礬而導(dǎo)致總鐵質(zhì)量濃度降低，但銅的浸出率并沒有明顯變化；添加不同質(zhì)量濃度Cu2+對黃銅礦的浸出沒有顯著的影響。同時，添加Fe2+和Cu2+與單獨添加Fe2+對黃銅礦的浸出影響是相似的。因此，在生物浸出過程中，可以通過調(diào)節(jié)浸礦微生物組成降低微生物的亞鐵氧化活性，提高硫氧化能力來控制溶液電位，從而強化黃銅礦的生物浸出。
關(guān)鍵字: 黃銅礦；中等嗜熱混合菌；銅離子；二價鐵離子；三價鐵離子
（1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Central South University, Changsha 410083, China）
Abstract:The effects of Fe2+, Fe3+, and Cu2+ on bioleaching of chalcopyrite by moderate thermophilic mixed bacteria were studied at 50 ℃ and pH 1.6. The experimental results show that addition of lower concentration of Fe2+ can enhance of the bioleaching of chalcopyrite in the early stage, while addition of higher concentration of Fe2+ will case the reduce the copper extraction percentage. When different concentrations of Fe3+ are added, the total Fe concentration will decrease owing to the formation of jarosite, but the copper extraction does not change significantly. The addition of Cu2+ at different concentrations has no obvious effect on the bioleaching of chalcopyrite. The effect of adding Fe2+ and Cu2+ on chalcopyrite leaching is similar to that of adding Fe2+ alone. Therefore, during the bioleaching process, the solution potential can be controlled by adjusting the composition of the microorganisms-decreasing the ability of ferrous oxidation and increasing the ability of sulfur oxidation-to enhance the bioleaching of chalcopyrite.
Key words: chalcopyrite; moderate thermophilic bacterial; Cu2+; Fe2+; Fe3+
