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http://dx.doi.org/10.7844/kirr.2021.30.4.54

Separation of Vanadium and Tungsten from Spent SCR DeNOX Catalyst by Ion-exchange Column  

Heo, Seo-Jin (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources)
Jeon, Jong-Hyuk (Convergence Research Center for Development of Mineral Resources, Korea Institute of Geoscience & Mineral Resources)
Kim, Rina (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources)
Kim, Chul-Joo (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)
Yoon, Ho-Sung (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources)
Publication Information
Resources Recycling / v.30, no.4, 2021 , pp. 54-63 More about this Journal
Abstract
Vanadium and tungsten can be obtained by separating/recovering the leaching solution from a spent SCR DeNOX catalyst using the soda roasting-water leaching process. Therefore, in this study, the adsorption/desorption mechanism of vanadium and tungsten in an ion-exchange column was investigated using Lewatit MonoPlus MP 600, a strong basic anion exchange resin. The operating conditions for the separation of vanadium and tungsten in the ion-exchange column was intended to present. By conducting a continuous adsorption experiment in a pH 8.5 solution, the adsorption capacity of vanadium and tungsten was found to be 44.75 and 64.92 mg/(g of resin), respectively, which showed that the adsorption capacity of tungsten was larger than that of vanadium because of the difference in ion charge. Vanadium has a higher affinity for MP 600 than tungsten. Consequently, as the vanadium-containing solution is eluted through the ion exchange resin onto which tungsten is adsorbed, the adsorbed tungsten is exchanged with vanadium and desorbed. A continuous experiment was performed with a solution of vanadium and tungsten prepared at the same concentration as the spent SCR DeNOX catalyst leachate. The adsorption capacity of vanadium was found to be 48.72 mg/(g of resin) and 80% of the supplied vanadium was adsorbed; in contrast, almost no tungsten was adsorbed. Therefore, vanadium and tungsten were separated effectively. The ion exchange resin was treated with 2 M HCl at 15 mL/h, and 97.7% of the vanadium(99% purity) could be desorbed. After desorption, NH4Cl was added to precipitate ammonium polyvanadate at 90℃ and recover 93% of the vanadium.
Keywords
Spent SCR $DeNO_X$ catalyst; Anion exchange resin; Adsorption; Vanadium; Tungsten;
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