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02-09-2023 | Original Article

Comprehensive recovery of W, V, and Ti from spent selective reduction catalysts

Authors: Li-Wen Ma, Xiao-Li Xi, Jia-Peng Chen, Fan Guo, Zi-Jie Yang, Zuo-Ren Nie

Published in: Rare Metals | Issue 10/2023

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Abstract

In this study, spent WO₃/V₂O₅-TiO₂ catalysts used for selective catalytic reduction were treated by a hydrometallurgical process to comprehensively recover valuable metallic elements, such as W, V, and Ti. Al and Si impurities were preferentially removed by selective microwave-assisted alkali leaching. W and V were leached by enhanced high-pressure leaching with efficiencies estimated at 95% and 81%. The leaching of W and V followed the nuclear shrinkage model controlled by the combination of product layer diffusion and interfacial chemical reaction. A synergistic extraction was applied to separate W and V using an extractant mixture of di-(2-ethylhexyl)phosphoric acid P204 and the primary amine N1923. The extraction efficiencies of V and W reached 86.5% and 6.3%, respectively, with a separation coefficient (V/W) of 95.30. The product was precipitated after extraction to yield ammonium paratungstate (APT) and NH₄VO₃. The TiO₂ catalyst carrier residue meets commercial specifications for reuse. This comprehensive recovery process with the characteristics of high-pressure leaching and synergistic extraction realizes the resourceful utilization of the spent catalysts.

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Title: Comprehensive recovery of W, V, and Ti from spent selective reduction catalysts
Authors: Li-Wen Ma
Xiao-Li Xi
Jia-Peng Chen
Fan Guo
Zi-Jie Yang
Zuo-Ren Nie
Publication date: 02-09-2023
Publisher: Nonferrous Metals Society of China
Published in: Rare Metals / Issue 10/2023
Print ISSN: 1001-0521
Electronic ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-023-02321-0

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