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Removal of Arsenic During Iron Extraction from Waste Copper Slag

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Abstract

Substantial quantities of openly dumped slag contribute to the absence of recovery and utilization of valuable metals as well as potential environmental pollution to water and soil. Owing to the excessively high arsenic content present in iron extracted from copper smelting slag, we propose a new arsenic removal process in this paper. The results indicate that arsenic sulfides in copper smelting slag can be significantly removed at 1100 °C in an N2 atmosphere, leading to a 0.15% residual arsenic content. Furthermore, undecomposed arsenate in the slag can be reduced in an N2–CO atmosphere. During a coal-based direct reduction process, under optimal conditions, the removal efficiency of arsenic is relatively low. Subsequently, under optimal conditions, the arsenic content drops significantly from 0.18 to 0.080%. This new removal process engenders lower arsenic content in iron extracted from slag than the standards of pig iron and direct reduced iron in steelmaking.

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Funding

Item Sponsored by National Science Foundation of China (51404075); Natural science foundation of Hebei Province (E2019209160) and Natural science foundation of Hebei Province (E2018209284).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Steel Process and Products, Central Iron and Steel Research Institute, Beijing, 100081, China

    Xin-yu Wan, Yuan-hong Qi & Jian-jun Gao

  2. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan, 063210, China

    Lu-kuo Hong

Authors
  1. Xin-yu Wan
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  2. Lu-kuo Hong
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  3. Yuan-hong Qi
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  4. Jian-jun Gao
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Correspondence to Lu-kuo Hong.

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Wan, Xy., Hong, Lk., Qi, Yh. et al. Removal of Arsenic During Iron Extraction from Waste Copper Slag. Trans Indian Inst Met 73, 2683–2691 (2020). https://doi.org/10.1007/s12666-020-02056-x

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  • DOI: https://doi.org/10.1007/s12666-020-02056-x

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