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An innovative lime roastingRoasting of Cu2S process was studied to abate SO2 production in roastingRoasting natural chalcociteChalcocite or 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 chalcociteChalcocite concentrate. Experiments in the range 550–800 °C, and XRD analysis of calcines indicated that the oxidation of Cu2S concentrate-CaO mixtures occurs according to the overall reaction: Cu2S + CaO + 2.5O2 = 2CuO + CaSO4. Thus, lime roastingRoasting could drastically reduce the atmospheric contamination with SO2. The advantage of this process is that the copperCopper in the calcines can be extracted selectively in the next stage by leaching in acid solutions. The optimal values determined for roastingRoasting were 600–750 °C, 21% oxygen partial pressureNon-polluting process, andNon-polluting processlime-roasting Cu2S:CaO molarLime-roasting ratio equal to 1:2.

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Lime Roasting Process for Copper Production from Chalcocite Without Polluting with SO2

  • 会议论文

  • 发表日期：

    2025年

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  • Rafael Padilla,
  • Pablo Hernandez,
  • Oscar Jerez

摘要

An innovative lime roastingRoasting of Cu2S process was studied to abate SO2 production in roastingRoasting natural chalcociteChalcocite or 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 chalcociteChalcocite concentrate. Experiments in the range 550–800 °C, and XRD analysis of calcines indicated that the oxidation of Cu2S concentrate-CaO mixtures occurs according to the overall reaction: Cu2S + CaO + 2.5O2 = 2CuO + CaSO4. Thus, lime roastingRoasting could drastically reduce the atmospheric contamination with SO2. The advantage of this process is that the copperCopper in the calcines can be extracted selectively in the next stage by leaching in acid solutions. The optimal values determined for roastingRoasting were 600–750 °C, 21% oxygen partial pressureNon-polluting process, andNon-polluting processlime-roasting Cu2S:CaO molarLime-roasting ratio equal to 1:2.