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http://dx.doi.org/10.7844/kirr.2019.28.5.42

Precipitation Behavior of Ammonium Vanadate from Solution Containing Vanadium  

Yoon, Ho-Sung (Korea Institute of Geoscience & Mineral Resources)
Chae, Sujin (Department of Ocean Energy & Resources Engineering, Korea Maritime & Ocean University)
Kim, Chul-Joo (Korea Institute of Geoscience & Mineral Resources)
Chung, Kyeong Woo (Korea Institute of Geoscience & Mineral Resources)
Kim, Minseuk (Korea Institute of Geoscience & Mineral Resources)
Publication Information
Resources Recycling / v.28, no.5, 2019 , pp. 42-50 More about this Journal
Abstract
In this study, the precipitation reaction of vanadium and ammonium chloride in aqueous solution was investigated in order to recover vanadium. Ammonium metavanadate having a crystal structure of [$NH_4VO_3$] was precipitated from aqueous solution containing vanadium at pH 9.2 ~ 9.4, and ammonium polyvanadate having a crystal structure of [$(NH_4)_2V_6O_{16}$] was precipitated when the pH of the aqueous solution containing vanadium was adjusted with sulfuric acid. Ammonium polyvanadate [$(NH_4)_2V_6O_{16}$] precipitated at a temperature of $80{\sim}90^{\circ}C$ and pH 2, and at a temperature of $40^{\circ}C$ and pH 6 ~ 8 of aqueous solution. In the acidic region of aqueous solution pH 2, the vanadium content of the aqueous solution should be at least 3,000 mg/L and the precipitation temperature should be maintained at $80^{\circ}C$ or higher in order to obtain a precipitation ratio of 99% or more. When the ammonium vanadate was precipitated in the alkaline region, the vanadium content was more than 10,000 mg/L and the precipitation temperature was maintained at $40^{\circ}C$ to increase the precipitation ratio. Aluminum was not precipitated regardless of the vanadium content and pH of the aqueous solution. However, the iron component reacts with ammonium chloride to precipitate into ammonium jarosite. Therefore, Fe component must be preferentially removed in order to increase the recovery of vanadium.
Keywords
vanadium; ammonium chloride; precipitation; ammonium metavanadate; ammonium polyvanadate;
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