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http://dx.doi.org/10.7844/kirr.2021.30.6.3

Effect of Precipitation Temperature and Solution pH on the Precipitation of Ammonium Metavanadate  

Heo, Seo-Jin (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources)
Kim, Rina (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources)
Chung, Kyeong Woo (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources)
Jeon, Ho-Seok (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources)
Kim, Chul-Joo (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources)
Yoon, Ho-Sung (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources)
Publication Information
Resources Recycling / v.30, no.6, 2021 , pp. 3-11 More about this Journal
Abstract
In this study, the effect of the solubility of ammonium metavanadate and the decomposition ratio of ammonium ions on a precipitation reaction-the precipitation of ammonium metavanadate by adding ammonium chloride to a sodium vanadate solution-was investigated. As the precipitation temperature and pH increased, the decomposition ratio of ammonium ions increased, and the decomposition ratio was greater than 81% at 45 ℃ and pH 9.3. This was approximately four times higher than that at pH 8. The result of the precipitation reaction, in view of these two factors that significantly influence the precipitation reaction, was that the precipitation yield increased as the temperature increased. However, the effect of temperature was not significant above 35 ℃. A kinetic study of the precipitation reaction revealed that the activation energy of the reaction was 42.3 kJ/mol. Therefore, considering the solubility of ammonium metavanadate, the lower the temperature, the better the vanadium recovery yield. Additionally, considering the decomposition of ammonium ions, the lower the pH of the aqueous solution, the more advantageous. However, at pH 8 or less, sodium polyvanadate is precipitated and the purity of vanadium oxide may reduce.
Keywords
Vanadium; Ammonium chloride; Precipitation; Ammonium metavanadate; Reaction rate;
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