Arsenic(V) removal from enargite leach solutions by precipitation of magnesium ammonium arsenate. Issue 11 (24th July 2019)

• Record Type: Journal Article
• Authors: Li, Tengfei; Zhang, Yansheng; Zhang, Bo; Chang, Kexin; Jiao, Fen; Qin, Wenqing
• Is Part Of: Separation science and technology. Volume 54:Issue 11(2019)
• Page Start: 1862
• Page End: 1870
• Publication Date: 2019-07-24
• Subjects: Arsenic removal -- precipitation -- magnesium ammonium arsenate -- magnesium arsenate; Separation (Technology) -- Periodicals; 660.284205
• DOI: 10.1080/01496395.2018.1538245
• Languages: English
• ISSNs: 0149-6395

Abstract

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.