Study on selective separation of V, Mo, W from Ti in spent SCR denitrification catalyst

ZHANG Kailong; CHEN Liang; WANG Zhenghao; LUO Dongmei

doi:10.7513/j.issn.1004-7638.2025.04.003

Volume 46 Issue 4

Aug. 2025

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ZHANG Kailong, CHEN Liang, WANG Zhenghao, LUO Dongmei. Study on selective separation of V, Mo, W from Ti in spent SCR denitrification catalyst[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 18-26. doi: 10.7513/j.issn.1004-7638.2025.04.003

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ZHANG Kailong, CHEN Liang, WANG Zhenghao, LUO Dongmei. Study on selective separation of V, Mo, W from Ti in spent SCR denitrification catalyst[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(4): 18-26. doi: 10.7513/j.issn.1004-7638.2025.04.003

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Study on selective separation of V, Mo, W from Ti in spent SCR denitrification catalyst

doi: 10.7513/j.issn.1004-7638.2025.04.003

1.
School of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China
2.
School of Metallurgy and Environment, Central South University, Changsha 410083, Hunan, China
3.
Tianfu Yongxing Laboratory, Chengdu 610213, Sichuan, China

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Received Date: 2025-03-27
Available Online: 2025-08-31
Publish Date: 2025-08-31

Abstract

Abstract

Spent V-Ti based SCR denitrification catalyst is a hazardous waste containing valuable metals such as V, Mo, W and Ti. It is of great significance to realize its harmless treatment and resource utilization. This study adopted processes such as Na₂CO₃ roasting-water leaching, NaOH roasting-water leaching, NaOH atmospheric pressure leaching, and NaOH pressurized leaching to treat spent V₂O₅-MoO₃-WO₃/TiO₂ quaternary SCR denitration catalyst respectively, achieving the selective separation of active components such as vanadium, molybdenum, and tungsten from titanium. By studying the influences of roasting parameters and leaching parameters on the leaching efficiencies of vanadium, molybdenum, and tungsten, as well as the phases of the leaching residues, the NaOH roasting-water leaching process was determined as the optimal treatment process for the spent V₂O₅-MoO₃-WO₃/TiO₂ quaternary SCR denitration catalyst. Under the optimized conditions, after NaOH roasting-water leaching, the leaching efficiencies of V, Mo and W reached 97.29%, 99.33% and 87.57%, respectively, and the leaching residue with sodium hexatitanate (Na₂Ti₆O₁₃) as the main phase was obtained.
- spent SCR catalyst,
- sodium roasting-water leaching,
- Na₂CO₃,
- NaOH,
- selective separation

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References(17)

References

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