Arsenic(V) removal from enargite leach solutions by precipitation of magnesium ammonium arsenate |
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| Authors: | Tengfei Li Bo Zhang Kexin Chang Fen Jiao Wenqing Qin |
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| Affiliation: | School of Minerals Processing and Bioengineering, Central South University, Changsha, China |
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| Abstract: | This study investigated a potential method for the removal of arsenic from enargite leach solution containing 5.86 g/L As(V) by precipitation of magnesium ammonium arsenate (MAA). The experimental results showed the As(V) concentration can be reduced to 1.8 mg/L under the optimum conditions. The molar ratio NH4/Mg/As in precipitates formed at different pH values was checked by wet chemical analysis, indicating that some of by-products such as Mg3(AsO4)2, Mg(OH)2, and MgHAsO4 will be formed at the solution pH above or below pH 9.5. Notably, this study indicated MAA has a better ability for arsenic removal than magnesium arsenate. The precipitates also were characterized by XRD and SEM. |
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| Keywords: | Arsenic removal precipitation magnesium ammonium arsenate magnesium arsenate |
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