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

In this study, spent WO 3 /V 2 O 5 -TiO 2 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...

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Bibliographic Details
Published inRare metals Vol. 42; no. 10; pp. 3518 - 3531
Main Authors Ma, Li-Wen, Xi, Xiao-Li, Chen, Jia-Peng, Guo, Fan, Yang, Zi-Jie, Nie, Zuo-Ren
Format Journal Article
LanguageEnglish
Published Beijing Nonferrous Metals Society of China 01.10.2023
Springer Nature B.V
Subjects
Aluminum
Biomaterials
Catalysts
Chemical reactions
Chemical reduction
Chemistry and Materials Science
Diethylhexylphosphoric acid
Diffusion layers
Energy
High pressure
Hydrometallurgy
Materials Engineering
Materials Science
Metallic Materials
Nanoscale Science and Technology
Original Article
Physical Chemistry
Pressure leaching
Recovery
Selective catalytic reduction
Silicon
Titanium
Titanium dioxide
Vanadium
Vanadium pentoxide-Titanium dioxide
Comprehensive recovery
Spent selective catalytic reduction (SCR) catalysts
Microwave leaching
Synergistic extraction
Pressure leaching
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Summary:In this study, spent WO 3 /V 2 O 5 -TiO 2 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 NH 4 VO 3 . The TiO 2 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. Graphical Abstract
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-023-02321-0