(1. 中南大学 资源加工与生物工程学院，长沙 410083；
2. 中南大学 生物冶金教育部重点实验室，长沙 410083)
摘 要: 采用生物浸出和电化学测试，研究低温10 ℃下AcidithiobacillusferrivoransYL15对黄铜矿和斑铜矿的协同浸出过程，结合不同的电化学测试手段探究其电化学溶解和表面钝化行为。结果表明：不同矿物体系的生物浸出和电化学行为存在极大差异。协同浸出组的浸出率最高，达到了48.4%，斑铜矿的次之，且两者都远高于黄铜矿的16.4%。斑铜矿的加入降低了氧化还原电位并维持到一个适宜的范围(400~420 mV)，加快了矿物的氧化。另外，通过电化学测试，发现协同浸出组的电位降低、电流升高和阻抗减小、氧化速率大幅提高。
关键字: 黄铜矿；斑铜矿；协同浸出；低温；电化学；钝化
（1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Biometallurgy, Ministry of Education, Central South University, Changsha 410083, China）
Abstract:In this paper, the synergistic leaching process of chalcopyrite and bornite by Acidithiobacillus ferrivoransYL15 was studied at low temperature of 10 ℃. And its electrochemical dissolution and surface passivation behaviors were investigated by combining different electrochemical test methods. The results show that the bioleaching and electrochemical behavior of various mineral systems are extremely different. The optimal extraction rate of 48.4% in synergetic leaching group is obtained, followed by bornite, both of which are much higher than 16.4% of chalcopyrite. The redox potential is reduced and maintained to a suitable range (400-420 mV) as the addition of bornite to accelerate the oxidation of minerals. In addition, the electrochemical tests results indicate that the reduced potential, increased current and decreased impedance corporately reflect the significant increase of oxidation rate during synergistic leaching.
Key words: chalcopyrite; bornite; synergistic bioleaching; low temperature; electrochemical; passivation
