氧化亚铁硫杆菌浸出钴白合金  

Study on Leaching of Cobalt White Alloy by Acidithiobacillus ferrooxidans

作　　者：胡国宏[1] 肖利[1,2] 方正[1] 钟晖 

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]湖南工业大学冶金工程学院,湖南株洲412008 [3]广东英德佳纳金属科技有限公司,广东英德513056

出　　处：《过程工程学报》2012年第2期200-205,共6页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:50874119);湖南省自然科学基金资助项目(编号:11jj6034)

摘　　要：用氧化亚铁硫杆菌(A.f菌)浸出难破碎的钴白合金,研究结果表明,A.f菌最适生长pH值为2.0,最佳生长温度为30℃.对9K培养基培养的A.f菌进行了3种处理方式实验:(1)直接接种:合金中钴浸出完成需6d,铜8d;(2)从菌液中离心收集:合金中钴浸出完成需3d,铜需7d;(3)经适应性培养:钴浸出完成需2d,铜需5d.浸出过程中pH值先增大后逐渐降低,电极电位随铜的浸出而增大.经适应性培养的A.f菌浸出白合金,浸渣成分为极少量的黄氨铁矾,钴和铜的浸出率分别达99.5%和99.0%.A.f菌浸出钴白合金中铜的作用机理为间接作用.Acidithiobacillus ferrooxidans （A.f） was used for leaching of the hard cobalt white alloy. The experiments determined the optimum pH value and temperature in the presence of A.f to be 2.0 and 30℃, respectively. Three modes of treatment of the bacteria, which are directly inoculated with 107 cells/mL in 9K culture medium, dispersed to 107 cells/mL in iron-free 9K culture medium and beforehand adapted by the alloy and collected by centrifugation, were used. The result showed that for the first mode, it took 6 d to finish the leaching of cobalt and 8 d for copper with decrease in number of the bacteria in leaching. For the second one, it needed 3 and 7 d to dissolve cobalt and copper out, respectively, and accompanied decrease in the bacteria. And for the third one, the modified A.f could be increased to 108 cells/mL, and the leaching of two metals was for 2 d and 5 d, respectively. In the leaching process, pH value increased first and then decreased. The electric potential increased with the leaching of copper. With the bacteria which were beforehand adapted by the leaching of cobalt white alloy, its leaching residue contained a little ammonium jarosite and the leaching rates of cobalt and copper were 99.50% and 99.0%. The leaching mechanism of copper in cobalt white alloy by A.f was the indirect effect.

关 键 词：钴白合金 氧化亚铁硫杆菌 浸出 间接作用 

分 类 号：TF803.21[冶金工程—有色金属冶金]