The bioleaching of bornite with mixed moderately thermophilic culture at 50 ℃ was investigated. The intermediary species formed during the leaching of bornite were characterized by XRD and XPS. In addition, the evolution of Cu-state during leaching of bornite was further studied by applying φh–pH diagram and cyclic voltammetry. The results showed that the bornite was more likely to be leached at high redox potential. Furthermore, the intermediary sulfides, such as isocubanite, covellite, chalcopyrite, disulfide, and polysulfide, were formed in the course of bornite dissolution. The Cu 2p photoelectron spectrum revealed that the valence of copper in bornite and intermediary sulfide formed in the dissolution of bornite is +1. The bornite and chalcopyrite can be converted into each other, and both can be further converted to covellite and/or chalcocite.%研究斑铜矿在50℃ 的混合中等嗜热微生物浸出.通过XRD和XPS表征在斑铜矿浸出过程中形成的中间产物,并利用 φh?pH图和循环伏安曲线进一步分析斑铜矿浸出过程中铜状态的转化.结果表明:较高的溶液(氧化还原)电位更有利于斑铜矿的浸出;在斑铜矿的浸出过程中可能形成方黄铜矿、铜蓝、黄铜矿以及二硫化物和多硫化物等中间产物;Cu 2p光电子能谱显示,斑铜矿和中间产物中铜的价态均为+1.斑铜矿和黄铜矿之间可以相互转化,并且两者都可以进一步转化为铜蓝和/或辉铜矿.
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