Abstract
Arsenic(III) removal and recovery from hydrochloric acid leach liquor of tungsten slag were systematically investigated by solvent extraction with 2-ethylhexanol. Because the iron in leach liquor could also be extracted by 2-ethylhexanol, the effects of various conditions on arsenic(III) and iron extraction were investigated and the optimum conditions were determined. Single extraction efficiency of 84.9% for arsenic(III) was achieved under the optimal conditions (10%(v/v) 2-ethylhexanol, 3.25 mol/L H+, 5.91 mol/L Cl−, O/A = 2, 303.15 K, 5 min). After two-stage countercurrent extraction, the extraction efficiency of arsenic(III) was 97.3% with only 0.75% of iron co-extracted. Using 1.0 mol/L of hydrochloric acid as stripping reagent, 97.4% of arsenic(III) was stripped at O/A ratio of 2 by single stage. Furthermore, the possible extraction mechanism of arsenic with 2-ethylhexanol was investigated via combining experimental results and FT-IR analysis, and the structure of the extracted complex was determined to be HAs(OH)2Cl2·ROH. The results of this study propose a potential application process for arsenic removal and recovery from hydrochloric acid system.
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The authors are thankful to the National Key Research and Development Program of China (2019YFC1907400) for financial support.
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Zeng, L., Yang, T., Guo, L. et al. Removal and Recovery of Arsenic(III) from Hydrochloric Acid Leach Liquor of Tungsten Slag by Solvent Extraction with 2-Ethylhexanol. JOM 74, 3021–3029 (2022). https://doi.org/10.1007/s11837-022-05369-y
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DOI: https://doi.org/10.1007/s11837-022-05369-y