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Effect of Surface Deposition Coating with Aluminum Hydroxide on the Stabilization of Iron–Arsenic Precipitates

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Abstract

Iron–arsenic coprecipitate is a kind of solid waste produced in the treatment of arsenic-bearing wastewater from non-ferrous metallurgy. Stability of amorphous coprecipitates is usually poor if the Fe/As ratio is lower. In this study, the surface of coprecipitates was deposited with aluminum hydroxide with the aim to prevent the release of arsenic. The deposition experiments were carried out at normal temperature using Al2(SO4)3 solutions with pH between the range of 6.0–7.0. The characterization of the coated precipitates was investigated using SEM-EDS, TEM, XRD, FTIR, and BET. The stability experiment showed that the coated precipitates exhibit a higher release of arsenic than the coprecipitates without coating. The anion exchange might have taken place in the coated surface, and the release of arsenic may be a comprehensive result.

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Funding

This work was financially supported by the Innovation Academy for Green Manufacture, Chinese Academy of Sciences (No. IAGM-2019-A05) and the Key Programs of the Chinese Academy of Sciences (Project No. ZDRW-ZS-2018-1).

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Authors and Affiliations

  1. State Key Laboratory of Multiphase Complex System, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China

    Yongliang Wang, Xiang Liu, Jingmin Yan, Peiwei Han, Yingchao Du & Shufeng Ye

  2. School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China

    Xiang Liu, Jingmin Yan & Yingchao Du

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  1. Yongliang Wang
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  2. Xiang Liu
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  3. Jingmin Yan
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Correspondence to Yongliang Wang.

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Wang, Y., Liu, X., Yan, J. et al. Effect of Surface Deposition Coating with Aluminum Hydroxide on the Stabilization of Iron–Arsenic Precipitates. Mining, Metallurgy & Exploration 38, 1277–1285 (2021). https://doi.org/10.1007/s42461-020-00366-8

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  • DOI: https://doi.org/10.1007/s42461-020-00366-8

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