Study on catalytic mechanism of silver ions in bioleaching of chalcopyrite by SR-XRD and XANES
文献类型：期刊论文
| 作者 | Shen, L ; Yuan, P; Ma, CY; Zheng, L; Zhao, YD; Ma CY(马陈燕); Zheng L(郑雷); Zhao YD(赵屹东); Xia, JL; Song, JJ
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| 刊名 | HYDROMETALLURGY
 |
| 出版日期 | 2018 |
| 卷号 | 180页码:26-35 |
| 关键词 | Bioleaching Chalcopyrite Ag+ SR-XRD XANES |
| ISSN号 | 0304-386X |
| DOI | 10.1016/j.hydromet.2018.07.008 |
| 文献子类 | Article |
| 英文摘要 | Ag+ is one of the efficient and recoverable catalysts to improve chalcopyrite bioleaching. Because of the complexity of the surface reaction during chalcopyrite bioleaching, there is still controversy on catalytic mechanism of Ag+ in improving dissolution of chalcopyrite. In the present study, we studied the catalytic effect of Ag+ on bioleaching of chalcopyrite by extreme thermophile Acidianus manzaensis. Based on synchrotron radiation X-ray diffraction (SR-XRD) and X-ray absorption near edge structure (XANES) spectroscopy, the relevant iron and sulfur speciation of leaching residues was analyzed. Bioleaching experiments showed that copper extraction was significantly promoted by adding Ag+, and the optimum concentration of Ag+ was 0.05% (mass fraction of Ag+ to chalcopyrite). SR-XRD and XANES analyses showed that, during bioleaching in the presence of 0.05% of Ag+ and in the absence of Ag+, the intermediates S, jarosite and secondary minerals (chalcocite, bomite and covellite) were formed. The linear combination fitting of XANES spectra further revealed that the addition of silver ions remarkably promoted the formation of bornite and covellite, while had no effect on formation of chalcocite, indicating that bioleaching of chalcopyrite should be catalyzed by Ag+ with promoting the generation of bornite and its conversion to covellite. This model suggested that the rapid formation of bornite like species contributed to positive effect of Ag+ on chalcopyrite bioleaching, while the accumulation of covellite slowed leaching rate at the end period of chalcopyrite bioleaching. |
| 电子版国际标准刊号 | 1879-1158 |
| WOS关键词 | ZINC SULFIDE CONCENTRATE ; X-RAY-ABSORPTION ; ACIDIANUS-MANZAENSIS ; IBES PROCESS ; ACIDITHIOBACILLUS-FERROOXIDANS ; ELECTROCHEMICAL DISSOLUTION ; HINDERED DISSOLUTION ; SECONDARY MINERALS ; COPPER ; BORNITE |
| WOS研究方向 | Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000446144500003 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/286371]  |
| 专题 | 高能物理研究所_多学科研究中心 高能物理研究所_加速器中心 高能物理研究所_东莞分部 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Shen, L,Yuan, P,Ma, CY,et al. Study on catalytic mechanism of silver ions in bioleaching of chalcopyrite by SR-XRD and XANES[J]. HYDROMETALLURGY,2018,180:26-35. |
| APA | Shen, L.,Yuan, P.,Ma, CY.,Zheng, L.,Zhao, YD.,...&Nie, ZY.(2018).Study on catalytic mechanism of silver ions in bioleaching of chalcopyrite by SR-XRD and XANES.HYDROMETALLURGY,180,26-35. |
| MLA | Shen, L,et al."Study on catalytic mechanism of silver ions in bioleaching of chalcopyrite by SR-XRD and XANES".HYDROMETALLURGY 180(2018):26-35. |
入库方式： OAI收割
来源：高能物理研究所
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