Partial Roasting of High-Arsenic Copper Concentrates
| Autor: | Roberto Parra, Eduardo Balladares, F. Parada, Jorge Etcheverry, Rodrigo Díaz, I. Wilkomirsky |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Chalcocite 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology engineering.material 01 natural sciences chemistry.chemical_compound 0103 physical sciences Materials Chemistry Bornite Arsenic 021102 mining & metallurgy Roasting Magnetite 010302 applied physics Chalcopyrite Metallurgy Metals and Alloys Condensed Matter Physics Copper chemistry Mechanics of Materials Fluidized bed visual_art visual_art.visual_art_medium engineering |
| Zdroj: | Metallurgical and Materials Transactions B. 51:2030-2038 |
| ISSN: | 1543-1916 1073-5615 |
| DOI: | 10.1007/s11663-020-01893-x |
| Popis: | The partial roasting of high-arsenic copper concentrates at 973 K/998 K (700 °C/725 °C) under controlled atmosphere can remove > 95 pct of the arsenic contained in the concentrates, leaving a calcine with 52 to 68 wt pct bornite, 10 to 13 wt pct chalcopyrite and 2 to 5 wt pct magnetite, with 8 to 24 wt pct remnant chalcocite. The mineralogic composition of the calcine obtained is consistent with the calculated mineralogic composition based on the chemical analysis of the calcine and the gaseous phase in equilibrium with the calcine. The formation of the new solid phases present in the calcine (bornite and chalcopyrite) should take place in the emulsion phase of the fluidized bed, while the oxidation of part of the gaseous sulfur generated by thermal decomposition of the sulfides present in the concentrate could occur in the evolving cloud and wake surrounding the air bubbles in the emulsion phase of the fluidized bed. |
| Databáze: | OpenAIRE |
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