Enrichment of ferric iron on mineral surface during bioleaching of chalcopyrite  

黄铜矿生物浸出过程中三价铁在矿物表面的富集（英文）

作　　者：彭堂见 周丹[1] 刘学端[1,2] 余润兰[1,2] 姜涛[1,2] 顾帼华[1,2] 陈淼 邱冠周[1,2] 曾伟民[1,2,3] 

机构地区：[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 [3]CSIRO Process Science and Engineering,Box 312,Clayton South,Victoria 3169,Australia

出　　处：《Transactions of Nonferrous Metals Society of China》2016年第2期544-550,共7页中国有色金属学报（英文版）

基　　金：Project(31200382)supported by the National Natural Science Foundation of China;Project(2013FJ4068)supported by the Planned Science and Technology Project of Hunan Province,China;Project supported by Australia CSIRO OCE Science Leader Grant

摘　　要：In order to investigate the enrichment of ferric iron bound by extracellular polymeric substance （EPS） on the mineral surface during bioleaching of chalcopyrite, several methods including sonication, heating and vortexing were used and sonication at 48℃ was shown as a good way to extract ferric iron. Scanning electron microscope （SEM） and energy dispersive X-ray spectrometer （EDX） analysis showed that lots of cracks and pits can be found on the chalcopyrite surface after bioleaching and that iron oxide was filled in these cracks and pits. The variations of contents of ferric iron and EPS on the chalcopyrite surface were investigated. The results indicated that the content of EPS increased rapidly in the first 10 d and then maintained at a stable level, while ferric iron content increased all the time, especially in the later stage of bioleaching.为探究黄铜矿生物浸出过程中与胞外多聚物结合的三价铁在矿物表面的富集,采用超声、加热和涡旋振荡提取矿物表面的三价铁。结果表明,在48°C条件下超声是一种有效的方法。扫描电镜和能量色散X射线能谱(EDX)分析表明,浸出后黄铜矿表面存在大量裂缝和凹陷,并且铁氧化物填充于这些裂缝和凹陷中。研究浸出过程黄铜矿表面三价铁和胞外多聚物的含量变化。结果表明,胞外多聚物的含量在浸出前10 d迅速上升,之后维持在一个稳定的水平,而三价铁含量随浸出时间的延长而增加,尤其是在浸出后期。

关 键 词：CHALCOPYRITE ferric iron extracellular polymeric substance EXTRACTION sonication BIOLEACHING 

分 类 号：TF18[冶金工程—冶金物理化学]