| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Drying, Roasting, Calcining and Agglomeration of Feedstocks
|
| Presentation Title |
Lime roasting process for copper production from chalcocite without polluting with SO2 |
| Author(s) |
Rafael Padilla, Pablo Hernandez, Oscar Jerez |
| On-Site Speaker (Planned) |
Rafael Padilla |
| Abstract Scope |
An innovative lime roasting of Cu2S process was studied to abate SO2 production in roasting natural chalcocite or in converting white metal produced in smelting technology. This process consists of oxidizing Cu2S in the presence of CaO capturing the sulfur as a solid species eliminating the atmospheric pollution with SO2. This work is solely on the oxidation process of chalcocite concentrate. Experiments in the range 550-800 oC, and XRD analysis of calcines indicated that the oxidation of Cu2S concentrate-CaO mixtures occur according to the overall reaction: Cu2S + CaO + 2.5O2(g) = 2CuO + CaSO4. Thus, lime roasting could drastically reduce the atmospheric contamination with SO2. The advantage of this process is that the copper in the calcines can be extracted selectively in the next stage by leaching in acid solutions. The optimal values determined for roasting were 600 to 750 oC, 21% oxygen partial pressure, and Cu2S:CaO molar ratio equal to 1:2 |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Extraction and Processing, Pyrometallurgy, Copper / Nickel / Cobalt |