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http://dx.doi.org/10.7844/kirr.2022.31.6.25

Separation of Vanadium and Tungsten from Simulated Leach Solutions using Anion Exchange Resins  

Jong Hyuk Jeon (Korea institute of Geoscience and Mineral Resources (KIGAM))
Hong In Kim (Korea institute of Geoscience and Mineral Resources (KIGAM))
Jin Young Lee (Korea institute of Geoscience and Mineral Resources (KIGAM))
Rajesh Kumar Jyothi (Korea institute of Geoscience and Mineral Resources (KIGAM))
Publication Information
Resources Recycling / v.31, no.6, 2022 , pp. 25-35 More about this Journal
Abstract
The adsorption/desorption behavior and separation conditions of vanadium and tungsten ions were investigated using a gel-type anion-exchange resin. In the adsorption experiment with the initial acidity of the solution, the adsorption rate of vanadium was remarkably low in strong acids and bases. Additionally, the adsorption rate of tungsten was low in a strong base. An increase in the reaction temperature increased the adsorption reaction rate and maximum adsorption. The effect of tungsten on the maximum adsorption was minimal. The adsorption isotherms of vanadium and tungsten on the ion-exchange resin were suitable for the Langmuir adsorption isotherms of both the ions. For tungsten, the adsorption isotherms of vanadium and tungsten were polyoxometalate. Both ion-exchange resins were simulated using similar quadratic reaction rate models. Vanadium was desorbed in the aqueous solutions of HCl or NaOH, the desorption characteristics of vanadium and tungsten depended on the desorption solution, and tungsten was desorbed in the aqueous solution of NaOH. It was possible to separate the two ions using the desorption process. The desorption reaction reached equilibrium within 30 min, and more than 90% recovery was possible.
Keywords
Anion exchange resin; Vanadium; Tungsten; Adsorption; Desorption; Spent SCR denitrification catalysts;
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