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<p>The efficient separation and extraction of valuable metals like copper and zinc from copper smelting dust (CSD), alongside the stable fixation of arsenic, is vital for improving the comprehensive recovery and utilization of secondary resources and achieving their safe disposal. This study applies an oxygen-pressure acid-leaching process to extract copper and zinc from the dust efficiently while immobilizing arsenic. Key parameters and phase transformations were investigated. Results show that, as the temperature increased from 140°C to 160°C, Cu and Zn extraction reached over 97% and 96%, respectively, with arsenic fixation rising from 36% to 93%. Precipitate morphology changed from amorphous ferric arsenate (FeAsO<sub>4</sub>&#xa0;nH<sub>2</sub>O, n ≠ 2) to crystalline scorodite (FeAsO<sub>4</sub>&#xa0;2H<sub>2</sub>O). The process occurred in two stages: rapid Cu/Zn leaching (0–60&#xa0;min) followed by As/Fe precipitation (60–180&#xa0;min). At 40 g L<sup>−1</sup> initial H<sub>2</sub>SO<sub>4</sub>, both high metal extraction and arsenic fixation were achieved. Higher oxygen pressure and Fe/As molar ratio enhanced oxidative mass transfer and scorodite formation kinetics. Under optimized conditions (160 °C, 3&#xa0;h, 40 g L<sup>−1</sup> H<sub>2</sub>SO<sub>4</sub>, 0.8 MPa O<sub>2</sub>, Fe/As = 1.3, L/S = 5:1), Cu/Zn leaching exceeded 96% with 93% arsenic fixation. The residue, containing lead sulfate (PbSO<sub>4</sub>) and scorodite (FeAsO<sub>4</sub>&#xa0;2H<sub>2</sub>O), confirms effective concurrent metal recovery and arsenic fixation.</p>

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Efficient Cu/Zn Leaching with Simultaneous Arsenic Fixation in Oxygen-Pressure Acid Leaching of Copper Smelting Dust

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Luo Jinsong,
  • Wang Yangbo,
  • Li Cunxiong,
  • Wang Qiliang,
  • Hu Yiping,
  • Deng Ge,
  • Dai Linqing

摘要

The efficient separation and extraction of valuable metals like copper and zinc from copper smelting dust (CSD), alongside the stable fixation of arsenic, is vital for improving the comprehensive recovery and utilization of secondary resources and achieving their safe disposal. This study applies an oxygen-pressure acid-leaching process to extract copper and zinc from the dust efficiently while immobilizing arsenic. Key parameters and phase transformations were investigated. Results show that, as the temperature increased from 140°C to 160°C, Cu and Zn extraction reached over 97% and 96%, respectively, with arsenic fixation rising from 36% to 93%. Precipitate morphology changed from amorphous ferric arsenate (FeAsO4 nH2O, n ≠ 2) to crystalline scorodite (FeAsO4 2H2O). The process occurred in two stages: rapid Cu/Zn leaching (0–60 min) followed by As/Fe precipitation (60–180 min). At 40 g L−1 initial H2SO4, both high metal extraction and arsenic fixation were achieved. Higher oxygen pressure and Fe/As molar ratio enhanced oxidative mass transfer and scorodite formation kinetics. Under optimized conditions (160 °C, 3 h, 40 g L−1 H2SO4, 0.8 MPa O2, Fe/As = 1.3, L/S = 5:1), Cu/Zn leaching exceeded 96% with 93% arsenic fixation. The residue, containing lead sulfate (PbSO4) and scorodite (FeAsO4 2H2O), confirms effective concurrent metal recovery and arsenic fixation.