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Wenfen Wu, Chenye Wang, Xingrui Wang, Huiquan Li. Removal of V and Fe from spent denitrification catalyst by using oxalic acid: Study of dissolution kinetics and toxicity. Green Energy&Environment, 2021, 6(5): 660-669. doi: 10.1016/j.gee.2020.03.011
Citation: Wenfen Wu, Chenye Wang, Xingrui Wang, Huiquan Li. Removal of V and Fe from spent denitrification catalyst by using oxalic acid: Study of dissolution kinetics and toxicity. Green Energy&Environment, 2021, 6(5): 660-669. doi: 10.1016/j.gee.2020.03.011
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Removal of V and Fe from spent denitrification catalyst by using oxalic acid: Study of dissolution kinetics and toxicity

doi: 10.1016/j.gee.2020.03.011

  • a. CAS Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China;

  • b. College of Chemical and Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China

Funds:

The authors are grateful for the financial support of the National Natural Science Foundation of China (No. 51574214).

  • Received date 22 November 2019, Accepted date 27 March 2020, RevRecd date 25 March 2020, Publish date 31 October 2021,
    Abstract

  • The selective dissolution of V and Fe from spent denitrification catalyst (SDC) with oxalic acid was investigated to minimise their environmental effects. The dissolution kinetics of different elements from SDC by using 0.1-1.5 mol L-1 oxalic acid concentration was studied at 60℃-90℃. V and Fe were preferentially released (65% and 81%) compared with Al, Ti and W within 5 min due to the redox reactions of oxalic acid. The dissolved fractions of Fe, V, Al, W and Ti increased with the increase of oxalic acid concentration and reaction temperature. The dissolution kinetic experiments were analysed and controlled diffusion with n < 0.5 according to the Avrami dissolve reaction model (R2 > 0.92). The Arrhenius parameters of the Ea values of Ti, W, V, Fe and Al from SDC with oxalic acid were 30, 26, 20, 19 and 11 kJ mol-1, respectively. The obtained Avrami equation of V and Fe was successfully used to predict their leaching behaviour in oxalic acid. Toxicity characteristic leaching procedure revealed that the toxicity risk of V and Fe metals from SDC after leaching with oxalic acid decreased to below 5 mg kg-1 residua. Overall, the leaching residua by oxalic acid indicated its safety for the environment.

     

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