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Zinc-lead-bearing slagZinc-lead-bearing slag generated from zinc/lead production process is a valuable secondary resource, which contains poly-metals such as Pb, Zn, Sn, and Fe. It has significant potential for comprehensive utilization. For the target slag, a pilot-scale testPilot-scale test employing a rotary hearth furnace (2.0 t/h) and subsequent EAF smelting separation (300 kVA) was performed in this study. Iron metallization reached 74% during reduction, whereas 88.67% Zn, 87.68% Pb, and 70.83% Sn volatilized. These heavy metals concentrated in flue dust at grades of 45.48% Zn, 25.62% Pb, and 4.78% Sn, this dust can serve as a premium alternative raw material for zinc/lead production. Following EAF smelting, molten iron exhibited 91.76% Fe content and 88.31% Fe recoveryRecovery. The consumption of raw materials, fuel, and energy was estimated using pilot-scale data. A preliminary economic analysis suggests that the carbothermic reduction followed by the smelting separation process for zinc-lead-bearing slagZinc-lead-bearing slag is cost-effective and may be suitable for full-scale implementation.

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Recovery of Valuable Metals from Zinc-Lead-Bearing Slag: A Pilot-Scale Study on Reduction Followed by Smelting Separation

  • 会议论文

  • 发表日期：

    2026年

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  • Mingyuan Gu,
  • Junxiang Guo,
  • Youhao Yin,
  • Zhengming Cheng,
  • Xin Lv

摘要

Zinc-lead-bearing slagZinc-lead-bearing slag generated from zinc/lead production process is a valuable secondary resource, which contains poly-metals such as Pb, Zn, Sn, and Fe. It has significant potential for comprehensive utilization. For the target slag, a pilot-scale testPilot-scale test employing a rotary hearth furnace (2.0 t/h) and subsequent EAF smelting separation (300 kVA) was performed in this study. Iron metallization reached 74% during reduction, whereas 88.67% Zn, 87.68% Pb, and 70.83% Sn volatilized. These heavy metals concentrated in flue dust at grades of 45.48% Zn, 25.62% Pb, and 4.78% Sn, this dust can serve as a premium alternative raw material for zinc/lead production. Following EAF smelting, molten iron exhibited 91.76% Fe content and 88.31% Fe recoveryRecovery. The consumption of raw materials, fuel, and energy was estimated using pilot-scale data. A preliminary economic analysis suggests that the carbothermic reduction followed by the smelting separation process for zinc-lead-bearing slagZinc-lead-bearing slag is cost-effective and may be suitable for full-scale implementation.