生物浸出
黄铜矿
柯石英
溶解
X射线光电子能谱
黄钾铁矾
钝化
化学
介电谱
铜
冶金
铜提取技术
扫描电子显微镜
材料科学
化学工程
图层(电子)
电化学
无机化学
电极
复合材料
有机化学
物理化学
工程类
作者
Chunxiao Zhao,Baojun Yang,Rui Liao,Maoxin Hong,Shichao Yu,Shitong Liu,Jun Wang,Guanzhou Qiu
标识
DOI:10.1016/j.mineng.2021.107283
摘要
• Visible light and Ag + have synergistic catalytic effect on chalcopyrite bioleaching. • Ag + introduced Ag 2 S and Ag 0 on the surface of chalcopyrite. • Light illumination promoted the formation of Ag 2 S and Ag 0 on chalcopyrite surface. • The formation of covellite-like species hindered the dissolution of chalcopyrite. • Ag + and visible light reduced the resistance of the passivation layer. The effect and mechanism of visible light and Ag + on chalcopyrite bioleaching were investigated in the presence of Acidithiobacillus ferrooxidans . The results of bioleaching tests revealed that the copper extraction was improved significantly when visible light and Ag + were simultaneously present. By analyzing bioleaching parameters, scanning electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy results: the accumulation of jarosite and the formation of covellite-like species led to the slow dissolution rate of chalcopyrite at the end period of bioleaching. The introduction of Ag + resulted in the formation of Ag 2 S and Ag 0 on the surface of chalcopyrite. And light illumination promoted the accumulation of Ag 2 S and Ag 0 on chalcopyrite surface, thus reducing the resistance of the passivation layer. Further, light illumination increased the rate of charge transfer and promoted the dissolution of chalcopyrite.
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