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Volume 24 Issue 2
Feb.  2017
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文章导航 >  矿物冶金与材料学报（英文）  > 2017  >  24(2): 156-163
Jing-peng Wang, Yi-min Zhang, Jing Huang,  and Tao Liu, Synergistic effect of microwave irradiation and CaF2 on vanadium leaching, Int. J. Miner. Metall. Mater., 24(2017), No. 2, pp. 156-163. https://doi.org/10.1007/s12613-017-1390-9
Cite this article as:
Jing-peng Wang, Yi-min Zhang, Jing Huang,  and Tao Liu, Synergistic effect of microwave irradiation and CaF2 on vanadium leaching, Int. J. Miner. Metall. Mater., 24(2017), No. 2, pp. 156-163. https://doi.org/10.1007/s12613-017-1390-9
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研究论文

Synergistic effect of microwave irradiation and CaF2 on vanadium leaching

  • School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China

  • Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource, Wuhan 430081, China

  • Hubei Provincial Collaborative Innovation Center for High Efficient Utilization of Vanadium Resource, Wuhan 430081, China

  • 通讯作者:

    Yi-min Zhang    E-mail: zym126135@126.com

  • The effect and mechanism of microwave irradiation on vanadium leaching were studied via a comparison between microwave heating and conventional heating. The results show a synergistic effect of microwave irradiation and calcium fluoride (CaF2) on the vanadium leaching efficiency. It is confirmed that the vanadium leaching process can be improved by microwave irradiation when CaF2 is present. The leaching rate of vanadium under microwave irradiation is increased by 8%-15% when 5wt% CaF2 is added; by contrast, in the absence of CaF2, the leaching rate is almost unaffected compared to that by conventional heating. Morphological analysis reveals that the particles are gradually eroded by acid under microwave irradiation, whereas some of the fine particles in samples subjected to conventional heating are tightly covered by a flocculent silicate product. Moreover, a large amount of Al and V and a small amount of Si are dissolved from samples under microwave heating, as revealed by the elemental analysis of leachates. Fourier transform infrared spectroscopic analysis also indicates a higher mass transfer coefficient in the diffusion layer of the raw material by microwave irradiation. When CaF2 is present, the reaction energy barrier is lowered and the leaching process is controlled by the tightly covered product layer, resulting in a prominent effect of microwave irradiation.
    • Research Article

    Synergistic effect of microwave irradiation and CaF2 on vanadium leaching

    + Author Affiliations
      Abstract
    • The effect and mechanism of microwave irradiation on vanadium leaching were studied via a comparison between microwave heating and conventional heating. The results show a synergistic effect of microwave irradiation and calcium fluoride (CaF2) on the vanadium leaching efficiency. It is confirmed that the vanadium leaching process can be improved by microwave irradiation when CaF2 is present. The leaching rate of vanadium under microwave irradiation is increased by 8%-15% when 5wt% CaF2 is added; by contrast, in the absence of CaF2, the leaching rate is almost unaffected compared to that by conventional heating. Morphological analysis reveals that the particles are gradually eroded by acid under microwave irradiation, whereas some of the fine particles in samples subjected to conventional heating are tightly covered by a flocculent silicate product. Moreover, a large amount of Al and V and a small amount of Si are dissolved from samples under microwave heating, as revealed by the elemental analysis of leachates. Fourier transform infrared spectroscopic analysis also indicates a higher mass transfer coefficient in the diffusion layer of the raw material by microwave irradiation. When CaF2 is present, the reaction energy barrier is lowered and the leaching process is controlled by the tightly covered product layer, resulting in a prominent effect of microwave irradiation.
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