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Zijin Mining Group initiated a R&D program in 2017 to address arsenic control challenge encountered in smelting of copper concentrate containing high arsenic. Following successful development of a new process for immobilizing arsenic in acidic effluent as an environmentally stable material, a commercial plant with design capacity of treating 600 m3/d waste acid containing 15 g/L As and 150 g/L H2SO4 was built in 2019 in Zijin Copper Smelter. It involves limestone neutralization of waste acid effluent to produce a clean gypsum by-product, arsenic oxidation, precipitation of scorodite under atmospheric condition, and a polish step to generate arsenic-free water for reuse or discharge. The plant was commissioned in December 2019 and full performance was achieved in 2 months. The up-to-date plant operation results show that the developed arsenic control process is technically and economically viable. The scorodite-based material produced in the process contains arsenic up to 25 wt.% and can meet both the US EPA TCLP (As<5 mg/L) and Chinese TCLP (As<1.2 mg/L) standards for disposal. The overall cost for arsenic stabilization including arsenic material disposal was in the range of US $2000–3000 per ton of arsenic stabilized.

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Arsenic Control in Copper Smelter Through Bleeding and Immobilization Treatment of Arsenic-Containing Waste Acid

  • 会议论文

  • 发表日期：

    2025年

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  • Qiankun Wang,
  • Jinghe Chen,
  • Xiaoyang Xu,
  • Honghan Lin,
  • Laichang Zou

摘要

Zijin Mining Group initiated a R&D program in 2017 to address arsenic control challenge encountered in smelting of copper concentrate containing high arsenic. Following successful development of a new process for immobilizing arsenic in acidic effluent as an environmentally stable material, a commercial plant with design capacity of treating 600 m3/d waste acid containing 15 g/L As and 150 g/L H2SO4 was built in 2019 in Zijin Copper Smelter. It involves limestone neutralization of waste acid effluent to produce a clean gypsum by-product, arsenic oxidation, precipitation of scorodite under atmospheric condition, and a polish step to generate arsenic-free water for reuse or discharge. The plant was commissioned in December 2019 and full performance was achieved in 2 months. The up-to-date plant operation results show that the developed arsenic control process is technically and economically viable. The scorodite-based material produced in the process contains arsenic up to 25 wt.% and can meet both the US EPA TCLP (As<5 mg/L) and Chinese TCLP (As<1.2 mg/L) standards for disposal. The overall cost for arsenic stabilization including arsenic material disposal was in the range of US $2000–3000 per ton of arsenic stabilized.