Comparative study on the passivation layers of copper sulphide minerals during bioleaching
| Autor: | Xiao-lan Mo, Han Wang, Zi-long Wen, Hai Lin, Hong-wei Wen, Kai-bin Fu |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Djurleite
Materials science Chalcopyrite Mechanical Engineering Metallurgy Inorganic chemistry Metals and Alloys chemistry.chemical_element Covellite engineering.material Copper Copper extraction techniques chemistry Geochemistry and Petrology Mechanics of Materials visual_art Bioleaching Jarosite Materials Chemistry visual_art.visual_art_medium Bornite engineering |
| Zdroj: | International Journal of Minerals, Metallurgy, and Materials. 19:886-892 |
| ISSN: | 1869-103X 1674-4799 |
| DOI: | 10.1007/s12613-012-0643-x |
| Popis: | The bioleaching of copper sulphide minerals was investigated by using A. ferrooxidans ATF6. The result shows the preferential order of the minerals bioleaching as djurleite>bornite>pyritic chalcopyrite>covellite>porphyry chalcopyrite. The residues were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It is indicated that jarosite may not be responsible for hindered dissolution. The elemental sulfur layer on the surface of pyritic chalcopyrite residues is cracked. The compact surface layer of porphyry chalcopyrite may strongly hinder copper extraction. X-ray photoelectron spectroscopy (XPS) further confirms that the passivation layers of covellite, pyritic chalcopyrite, and porphyry chalcopyrite are copper-depleted sulphide Cu4S11, S8, and copper-rich iron-deficient polysulphide Cu4Fe2S9, respectively. The ability of these passivation layers was found as Cu4Fe2S9>Cu4S11>S8>jarosite. |
| Databáze: | OpenAIRE |
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