Bio-oxidation of arsenopyrite  

作　　者：姜涛 李骞 杨永斌 李光辉 邱冠周 

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University

出　　处：《中国有色金属学会会刊：英文版》2008年第6期1433-1438,共6页Transactions of Nonferrous Metals Society of China

基　　金：Project(50321402)supported by the National Natural Science Foundation of China;Project(2004CB619204)supported by the National Basic Research Program of China

摘　　要：有 Acidithiobacillus ferrooxidans 的毒砂的氧化被学习。电气化学的结果证明那毒砂第一在 0.2 的潜力被氧化到 As2S2 ? 0.3 V (对她) 并且 As2S2 盖住电极并且延迟这个过程连续地。当时在在 0.3 V 上的更高的潜力(对她) ， As2S2 被氧化到 H3AsO3，和 H3AsO3 然后在 0.8 V 被氧化到 H3AsO4 (对她) 。沥滤的结果证明 FeS2 的增加能把 As3+ 的氧化提升到 As5+ 并且增加细菌的活动。最好的简历氧化技术参数是 1.8 的起始的 pH ? 2.0，粒子缩放不到 0.074 公里，在 25 的范围的温度 ?Oxidation of arsenopyrite with Acidithiobacillus ferrooxidans was studied. The electrochemical results show that arsenopyrite is firstly oxidized to As2S2 at the potential of 0.2-0.3 V （vs SHE） and As2S2 covers the electrode and retards the process continuously. While at higher potential over 0.3 V （vs SHE）, AszS2 is oxidized to H3AsO3, and H3AsO3 is then oxidized to H3AsO4 at 0.8 V （vs SHE）. The leaching results show that the addition of FeS2 can promote the oxidation of As^3＋ to As^5＋ and increase the activity of the bacteria. The best bio-oxidation technical parameters are the initial pH of 1.8-2.0, particle sizes less than 0.074 mm, temperature in the range of 25-30℃ and rotating speed of the orbital incubator of 100-160 r/min. The results provide theoretical and technological supports of bio-oxidation arsenopyrite for pretreating refractory arsenic gold ores.

关 键 词：毒砂 电化学 生物氧化 氧化亚铁 

分 类 号：TF18[冶金工程—冶金物理化学]