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Calcium arsenic (As) residues (CARs) have high arsenic solubility in the environment and hence need stabilization treatment. In this work, a novel method was proposed to leach the As and valuable metals from CARs with As-containing waste sulfuric acid (WSA) followed by immobilization of arsenic as scorodite. The results showed that 93.5% of As and almost all the valuable metals in the CARs were leached out in 10 h. After precipitation of scorodite, most of the valuable metals in the residual solution were recovered by precipitation as metal (hydr)oxides. This work provides a novel method for simultaneous treatment of CARs and WSA.

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Coprocessing of Calcium Arsenic Residues and Waste Sulfuric Acid: Arsenic Immobilization and Valuable Metals Recovery

  • 会议论文

  • 发表日期：

    2025年

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  • Yumeng Wang,
  • Danni Zhang,
  • Shaofeng Wang,
  • Yongfeng Jia

摘要

Calcium arsenic (As) residues (CARs) have high arsenic solubility in the environment and hence need stabilization treatment. In this work, a novel method was proposed to leach the As and valuable metals from CARs with As-containing waste sulfuric acid (WSA) followed by immobilization of arsenic as scorodite. The results showed that 93.5% of As and almost all the valuable metals in the CARs were leached out in 10 h. After precipitation of scorodite, most of the valuable metals in the residual solution were recovered by precipitation as metal (hydr)oxides. This work provides a novel method for simultaneous treatment of CARs and WSA.