RECOVERY OF TITANIUM, VANADIUM AND TUNGSTEN FROM WASTE SCR DENITRATION CATALYST BY DRY-WET PROCESS

TENG Yu-ting; ZHANG Ya-ping; WANG Ling; WU Peng

doi:10.13205/j.hjgc.202011027

Volume 38 Issue 11

Apr. 2021

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TENG Yu-ting, ZHANG Ya-ping, WANG Ling, WU Peng. RECOVERY OF TITANIUM, VANADIUM AND TUNGSTEN FROM WASTE SCR DENITRATION CATALYST BY DRY-WET PROCESS[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(11): 163-167,174. doi: 10.13205/j.hjgc.202011027

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TENG Yu-ting, ZHANG Ya-ping, WANG Ling, WU Peng. RECOVERY OF TITANIUM, VANADIUM AND TUNGSTEN FROM WASTE SCR DENITRATION CATALYST BY DRY-WET PROCESS[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(11): 163-167,174. doi: 10.13205/j.hjgc.202011027

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RECOVERY OF TITANIUM, VANADIUM AND TUNGSTEN FROM WASTE SCR DENITRATION CATALYST BY DRY-WET PROCESS

doi: 10.13205/j.hjgc.202011027

Key Laboratory for Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

Received Date: 2019-11-04
Available Online: 2021-04-23
Publish Date: 2021-04-23

Abstract

Abstract

In this paper, the efficient separation and leaching of Ti, V and W elements in the waste SCR denitration catalyst were carried out by the dry-wet method, and the recovery technology of Ti, V and W in the waste SCR denitration catalyst was proposed. Taking waste SCR denitration catalyst as the research object, the leaching conditions of Ti, V and W elements were optimized, and the recovery rate and purity of TiO₂ recovered by sulfuric acid dissolution method and V₂O₅ and WO₃ recovered by organic extraction method were also researched. The results showed that the optimal process conditions for acid leaching and reduction of vanadium were temperature of 140 ℃, liquid-solid ratio of 30:1; and the optimal process conditions for sodium roasting and leaching of tungsten were roasting temperature of 750 ℃, reactants and Na₂CO₃ ratio of 1:1.5. Under the above reaction conditions, the leaching rates of V and W were 97.6% and 93.6%, respectively. The TiO₂ product recovered by the sulfuric acid dissolution method mainly existed in the form of anatase crystal. At the optimum roasting temperature of 750 ℃, the recovery rate of TiO₂ was 97.17% and the purity rate was 95.35%. The recovery and purity rate of the V₂O₅ and WO₃ products recovered by the organic extraction method were 72.47%, 75.43%, and 93.25%, 78.26%, respectively.
- waste SCR denitration catalyst,
- leaching,
- recovery,
- titanium,
- vanadium,
- tungsten

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References(21)

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