Catalytic effect of visible light and Cd^2+on chalcopyrite bioleaching  

可见光和Cd^2+对黄铜矿生物浸出的催化作用

作　　者：Chun-xiao ZHAO Bao-jun YANG Xing-xing WANG Hong-bo ZHAO Min GAN Guan-zhou QIU Jun WANG 赵春晓;杨宝军;王星星;赵红波;甘敏;邱冠周;王军(中南大学资源加工与生物工程学院生物冶金教育部重点实验室,长沙410083)

机构地区：[1]Key Laboratory of Biohydrometallurgy,Ministry of Education,School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第4期1078-1090,共13页中国有色金属学报（英文版）

基　　金：Projects(51774332,51934009,51704331,51804350,U1932129)supported by the National Natural Science Foundation of China;Project(2018JJ1041)supported by the Natural Science Foundation of Hunan Province,China。

摘　　要：The effects of visible light and Cd^2+ion on chalcopyrite bioleaching in the presence of Acidithiobacillus ferrooxidans(A.ferrooxidans)were studied by scanning electron microscopy(SEM),synchrotron radiation X-ray diffraction(SR-XRD),and X-ray photoelectron spectroscopy(XPS).The results of bioleaching after 28 days showed that the copper dissolution increased by 4.96%with only visible light,the presence of Cd2+alone exerted slight inhibition effect on chalcopyrite dissolution and the concentration of dissolved copper increased by 14.70%with visible light and 50 mg/L Cd^2+.The results of chemical leaching showed that visible light can promote the circulation of iron.SEM results showed that Cd^2+promoted the attachment of A.ferrooxidans on chalcopyrite surface under visible light.SR-XRD and XPS results indicated that visible light and Cd^2+promoted chalcopyrite dissolution,but did not inhibit the formation of passivation.Finally,a model of synergistic catalysis mechanism of visible light and Cd2+on chalcopyrite bioleaching was proposed.利用扫描电镜(SEM)、同步辐射X射线衍射(SR-XRD)和X射线光电子能谱(XPS)研究在酸性氧化亚铁硫杆菌存在下,可见光和镉离子(Cd^2+)对黄铜矿生物浸出的影响。生物浸出28天后的结果表明,光照下铜的溶解提高4.96%;Cd^2+单独存在对黄铜矿的浸出有轻微的抑制作用;可见光和50 mg/L Cd^2+同时存在时,溶解铜的浓度提高14.70%。化学浸出结果表明,可见光能促进体系中铁元素的循环。SEM结果显示,Cd^2+在可见光下促进酸性氧化亚铁杆菌在黄铜矿表面的附着。综合SR-XRD和XPS结果可知,可见光和Cd^2+促进黄铜矿的浸出,但不会抑制钝化物的形成。提出可见光和Cd^2+对黄铜矿生物浸出协同催化作用机制的模型。

关 键 词：BIOLEACHING CHALCOPYRITE Cd2+ Acidithiobacillus ferrooxidans visible light 

分 类 号：TF811[冶金工程—有色金属冶金]