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<p>The sulfide precipitation of waste acid from a copper smelting plant is investigated. Sodium thiosulfate is selected as precipitant agent due to high precipitation rate of copper and rhenium and low precipitation rate of arsenic in contrast to sodium sulfide and sodium hydrosulfide. Thermodynamics analyses are investigated with Eh-pH diagrams of Cu/Re/As-S-H<sub>2</sub>O by HSC, Gibbs free energy of reactions, and solubility product of precipitated products. The priority of metal ions being precipitated is Cu &gt; Re &gt; As. The effect of dosage of sodium thiosulfate, reaction time, and temperature on precipitation are examined. Under optimal conditions, the mass fraction of copper and rhenium in residues is up to 2.96% and 2.19%, corresponding to precipitation efficiencies of 99.58% and 100%, respectively. At 175&#xa0;mV, cooper is precipitated first, followed by rhenium at 150&#xa0;mV. Copper, rhenium, and arsenic precipitate in the form of sulfides, with rhenium at + 4 valence, copper at + 1/ + 2 valence, and arsenic at + 3/ + 5 valence, which is consistent with thermodynamics analysis and experiment results.</p>

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Efficient Enrichment of Copper and Rhenium from Copper Smelting Waste Acid Utilizing Sodium Thiosulfate

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Li Niu,
  • Da Li,
  • Hancheng Mao,
  • Shengdong Wang,
  • Hao Ma,
  • Haibei Wang

摘要

The sulfide precipitation of waste acid from a copper smelting plant is investigated. Sodium thiosulfate is selected as precipitant agent due to high precipitation rate of copper and rhenium and low precipitation rate of arsenic in contrast to sodium sulfide and sodium hydrosulfide. Thermodynamics analyses are investigated with Eh-pH diagrams of Cu/Re/As-S-H2O by HSC, Gibbs free energy of reactions, and solubility product of precipitated products. The priority of metal ions being precipitated is Cu > Re > As. The effect of dosage of sodium thiosulfate, reaction time, and temperature on precipitation are examined. Under optimal conditions, the mass fraction of copper and rhenium in residues is up to 2.96% and 2.19%, corresponding to precipitation efficiencies of 99.58% and 100%, respectively. At 175 mV, cooper is precipitated first, followed by rhenium at 150 mV. Copper, rhenium, and arsenic precipitate in the form of sulfides, with rhenium at + 4 valence, copper at + 1/ + 2 valence, and arsenic at + 3/ + 5 valence, which is consistent with thermodynamics analysis and experiment results.