A copper and iron K-edge XANES study on chalcopyrite leached by mesophiles and moderate thermophiles
| Autor: | Miao Chen, Yi Yang, Weihua Liu |
|---|---|
| Přispěvatelé: | Yang, Yi, Liu, Weihua, Chen, Miao |
| Rok vydání: | 2013 |
| Předmět: |
intermediates
Inorganic chemistry chemistry.chemical_element engineering.material Fe K-edge XANES Bioleaching Jarosite Dissolution Cu Chalcopyrite Mechanical Engineering Metallurgy General Chemistry Geotechnical Engineering and Engineering Geology Copper XANES chalcopyrite CuSₙ chemistry K-edge Control and Systems Engineering visual_art visual_art.visual_art_medium engineering bioleaching Leaching (metallurgy) |
| Zdroj: | Minerals Engineering. 48:31-35 |
| ISSN: | 0892-6875 |
| DOI: | 10.1016/j.mineng.2013.01.010 |
| Popis: | To reveal the mechanism of chalcopyrite biooxidation at different temperatures, pure chalcopyrite leached by mesophiles (30 °C) and moderate thermophiles (48 °C) was characterized by synchrotron X-ray absorption near-edge structure (XANES). Solution studies show that elevated temperatures promoted chalcopyrite dissolution. A final copper recovery of 41% was achieved at 48 °C, while only 15% at 30 °C. Cu K -edge XANES analyses indicated more iron than copper dissolved, leaving on the particle surface CuS n -like species in the early stages of leaching. In the late stages of leaching, copper in CuS n -like species was leached, leaving behind S n -like species. The slowness of leaching of S n -like species may be the reason why no CuS n -like species were formed in the late stages, and thus why chalcopyrite passivated. In addition, Fe K -edge XANES indicates no significant amount of jarosite formed at 30 °C; however, at 48 °C, jarosite precipitation was profoundly accelerated, which accounted for 51% of the iron species in the residue at day 35. |
| Databáze: | OpenAIRE |
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