Electronic Structures and Electrochemical Study of Chalcopyrite / Malachite Sulphidisation
Received:January 17, 2018  Revised:January 17, 2018
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KeyWord:Chalcopyrite; malachite; flotation; electronic property; cyclic voltammetry
              
AuthorInstitution
zhuyangge 北京矿冶科技集团有限公司
CHEN Jianhua 广西大学 资源环境与材料学院;广西大学 资源环境与材料学院
KE Baolin 贵州大学
ZHANG Xingrong 北京矿冶科技集团有限公司
HU Xiaoxing 北京矿冶科技集团有限公司
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Abstract:
      To understand how sodium sulfide affects the flotation behavior of chalcopyrite and malachite with xanthate as collector, electronic density calculation, cyclic voltammetry tests and flotation tests was conducted. The results showed that sodium sulfides can significantly depress the flotation of chalcopyrite while activate malachite. There exists strong electron cloud overlap between copper atoms and sulfur atoms within chalcopyrite, so the distinct covalent interaction facilitates the adsorption of xanthates on surface of chalcopyrite particles. An apparent oxidation peak on cyclic voltammetry curve of chalcopyrite with xanthate went down and disappeared eventually while gradually adding sodium sulfide, which demonstrated a clear depression impact on the adsorption of xanthates on chalcopyrite.On the contrary, within malachite the electron cloud overlap between copper atoms and oxygen atoms is weak, the predominant ionic bonds impede the adsorption of xanthates. After the addition of sodium sulfide and within certain concentrations, oxidation peak appeared within the range of 0.4 – 0.6V on cyclic voltammetry curve, which means sodium sulfide can enhance the adsorption of xanthates on malachite and thereby activated its flotation. The process is an electrochemical process, which is accompanied by electron transfer.
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