Optimization of Conditions for Ammonium Metavanadate and Polyvanadate Precipitation from Alunite Processing Solutions
A. KH. OSMANOVA
Nagiev Institute of Catalysis and Inorganic Chemistry, National Academy of Sciences of Azerbaijan, Baku, Azerbaijan
Keywords: vanadium, metavanadate, polyvanadate, precipitation, alunite
Pages: 71-78
Abstract
Vanadium precipitation in the form of ammonium metavanadate and polyvanadate from alunite processing solutions is studied. The degree of precipitation of vanadium-containing sediment is determined, depending on solution pH, the initial concentration of vanadium(V) oxide and ammonium sulphate, temperature, and contact time. The results show that ammonium metavanadate (NH4VO3) precipitates from the solution at room temperature at pH 8, and when the ammonium metavanadate solution is heated to 90 °C and then acidified to pH 2 and stirred, ammonium polyvanadate (NH4)2V6O16 precipitates. The obtained products were characterized by X-ray phase analysis, infrared spectroscopy, and scanning electron microscopy.
DOI: 10.15372/CSD2023441
EDN: KTTBUD
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