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<p>In order to solve the problem of high cost of metal extraction in copper–zinc sulfide ore and the difficulty of effective utilization of large amount of copper smelting slag, this study proposes a new idea of vacuum carbothermal co-reduction of copper smelting slag and copper–zinc sulfide concentrate. The preferred process conditions for zinc volatilization were obtained by adjusting the reaction temperature and reaction holding time, and the reduced slag under these conditions was analyzed by EDS-SEM. The results indicate that mixing copper smelting slag, copper–zinc sulfide concentrate, and semi-coke in a molar ratio of n(ZnS):n(Fe<sub>3</sub>O<sub>4</sub>):n(C) = 1:0.37:1.61, under an initial furnace pressure of 10 Pa and a reaction temperature of 1000&#xa0;°C, with a holding time of 40 minutes, can achieve a zinc volatilization rate of up to 99.50&#xa0;pct. In the reduced slag, the elements Cu, Fe, and S mainly exist in the forms of Cu<sub>5</sub>FeS<sub>4</sub> and FeS, with S being fixed in the slag. The contents of Cu, Fe, and S are 16.0, 44.5, and 19.3&#xa0;pct, respectively. The enriched sulfide can be used as raw materials for copper smelting after flotation.</p>

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Co-reduction of Copper–Zinc Sulfide Ore and Copper Smelting Slag for Zinc Extraction in a Vacuum Carbothermic Process

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Hongzhou Ma,
  • Jinyang Zeng,
  • Yaoning Wang,
  • Yubo Dang,
  • Shuaimin Wang,
  • Minghua Guan,
  • Xing Zhang

摘要

In order to solve the problem of high cost of metal extraction in copper–zinc sulfide ore and the difficulty of effective utilization of large amount of copper smelting slag, this study proposes a new idea of vacuum carbothermal co-reduction of copper smelting slag and copper–zinc sulfide concentrate. The preferred process conditions for zinc volatilization were obtained by adjusting the reaction temperature and reaction holding time, and the reduced slag under these conditions was analyzed by EDS-SEM. The results indicate that mixing copper smelting slag, copper–zinc sulfide concentrate, and semi-coke in a molar ratio of n(ZnS):n(Fe3O4):n(C) = 1:0.37:1.61, under an initial furnace pressure of 10 Pa and a reaction temperature of 1000 °C, with a holding time of 40 minutes, can achieve a zinc volatilization rate of up to 99.50 pct. In the reduced slag, the elements Cu, Fe, and S mainly exist in the forms of Cu5FeS4 and FeS, with S being fixed in the slag. The contents of Cu, Fe, and S are 16.0, 44.5, and 19.3 pct, respectively. The enriched sulfide can be used as raw materials for copper smelting after flotation.