Study on selective separation of vanadium, titanium and tungsten from spent SCR denitration catalyst

Zhang Zhenquan; Zhao Beibei; Li Lanjie; Dong Zihui; Bai Ruiguo; Wang Haixu

doi:10.7513/j.issn.1004-7638.2021.01.004

Volume 42 Issue 1

Feb. 2021

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Zhang Zhenquan, Zhao Beibei, Li Lanjie, Dong Zihui, Bai Ruiguo, Wang Haixu. Study on selective separation of vanadium, titanium and tungsten from spent SCR denitration catalyst[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 24-31. doi: 10.7513/j.issn.1004-7638.2021.01.004

Citation:

Zhang Zhenquan, Zhao Beibei, Li Lanjie, Dong Zihui, Bai Ruiguo, Wang Haixu. Study on selective separation of vanadium, titanium and tungsten from spent SCR denitration catalyst[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 24-31. doi: 10.7513/j.issn.1004-7638.2021.01.004

Citation:

Zhang Zhenquan, Zhao Beibei, Li Lanjie, Dong Zihui, Bai Ruiguo, Wang Haixu. Study on selective separation of vanadium, titanium and tungsten from spent SCR denitration catalyst[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 24-31. doi: 10.7513/j.issn.1004-7638.2021.01.004

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Study on selective separation of vanadium, titanium and tungsten from spent SCR denitration catalyst

doi: 10.7513/j.issn.1004-7638.2021.01.004

1.
Institute of Vanadium and Titanium Technology, HBIS Group Chengsteel Company, Chengde 067102, Hebei, China
2.
Hebei Province Key Laboratory of Vanadium and Titanium New Materials, Chengde 067102, Hebei, China
3.
Hebei Vanadium and Titanium Industrial Technology Research Institute, Chengde 067102, Hebei, China

Received Date: 2020-12-07
Publish Date: 2021-02-10

Abstract

Abstract

Titanium was selectively separated from waste SCR catalyst by NaOH leaching, HCl leaching and sodium carbonate roasting followed by water leaching, respectively. The results show that titanium can be separated from vanadium and tungsten by sodium carbonate roasting and water leaching of the catalyst. The optimum process conditions are as follows: roasting temperature 850 ℃, roasting time 3 h, mass ratio of sodium carbonate to waste catalyst 1.3, leaching temperature 95 ℃, leaching time 1 h, stirring speed 500 r/min. The leaching rates of V, As and W are 52.26%, 98.24% and 99.9%, respectively. High efficient titanium extraction can be achieved by leaching sodium roasting slag of the spent SCR catalyst with sulfuric acid. The optimum conditions are as follows: 40% sulfuric acid, liquid-solid ratio 4∶1, leaching temperature 90 ℃, leaching time 3 h, stirring speed 500 r/min. The leaching rate of titanium is 93.4%. Metatitanic acid was prepared by hydrolysis. The hydrolysis rate of titanium is 94.05% and the purity of metatitanic acid is 94.07%.
- titanium extraction,
- spent SCR catalyst,
- selective separation,
- NaOH,
- HCl,
- sodium carbonate roasting, water leaching

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References(16)

References

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