Effect of initial pH on chalcopyrite oxidation dissolution in the presence of extreme thermophile Acidianus manzaensis  

初始pH对极端嗜热菌万座嗜酸两面菌作用下黄铜矿氧化溶解的影响(英文)

作　　者：梁长利[1,2] 夏金兰[2,3] 聂珍媛[2,3] 余水静[1] 许宝泉[1] 

机构地区：[1]江西理工大学资源与环境工程学院,赣州341000 [2]中南大学资源加工与生物工程学院,长沙410083 [3]中南大学教育部生物冶金重点实验室,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第6期1890-1897,共8页中国有色金属学报（英文版）

基　　金：Projects (50974140,51274257) supported by the National Natural Science Foundation of China;Project (JXXJBS11003) supported by the Doctor Initiating Foundation of Jiangxi University of Science and Technology,China

摘　　要：The influence of initial pH on the chalcopyrite oxidation dissolution at 65 ℃ was investigated by bioleaching and cyclic voltammetiy experiments,and the oxidation products were investigated by XRD and Raman spectroscopy.Bioleaching results show that chalcopyrite dissolution rate increases with the decrease of the initial pH in chemical leaching,while the influence of initial pH on bioleaching is on the contrary.The presence of Acidianus manzaensis does not promote chalcopyrite dissolution under initial pH1.0,which mainly results from serious inhibition of high acidity to the growth of Acidianus manzaensis.Electrochemical experiments results show that anodic oxidation currents of electrolyte with or without Acidianus manzaensis both increase with the increase of initial pH,and covellite and sulfur are detected on the electrode surface.The results confirm that chalcopyrite dissolution in chemical leaching is under the combined action of oxidation and non-oxidation of proton,with conversion of chalcopyrite to covellite and elemental sulfur.采用生物浸出和循环伏安试验研究初始pH对黄铜矿在65℃条件下氧化溶解的影响,分别采用XRD和拉曼光谱分析黄铜矿生物浸出过程中和电极表面形成的氧化产物。化学浸出结果表明:黄铜矿溶解速率随着初始pH的减小而增大,然而初始pH对黄铜矿生物浸出的影响却正好相反。当初始pH为1.0时,万座嗜酸两面菌的加入几乎没有促进黄铜矿的溶解,这主要是由于高酸度严重抑制了万座嗜酸两面菌的生长。电解液中存在或不存在万座嗜酸两面菌时黄铜矿的阳极氧化电流都随着初始pH的增大而增大,同时在黄铜矿电极表面检测到了单质硫和铜蓝。结果表明,在化学浸出过程中黄铜矿是在质子作用和氧化作用下溶解的,黄铜矿氧化生成了铜蓝和单质硫。

关 键 词：CHALCOPYRITE BIOLEACHING Acidianus manzaensis initial pH oxidation dissolution 

分 类 号：TF18[冶金工程—冶金物理化学]