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Comparison of the interface reaction behaviors of CaO-V2O5 and MnO2-V2O5 solid-state systems based on the diffusion couple method

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Abstract

The formation mechanism of calcium vanadate and manganese vanadate and the difference between calcium and manganese in the reaction with vanadium are basic issues in the calcification roasting and manganese roasting process with vanadium slag. In this work, CaO-V2O5 and MnO2-V2O5 diffusion couples were prepared and roasted for different time periods to illustrate and compare the diffusion reaction mechanisms. Then, the changes in the diffusion product and diffusion coefficient were investigated and calculated based on scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS) analysis. Results show that with the extension of the roasting time, the diffusion reaction gradually proceeds among the CaO-V2O5 and MnO2-V2O5 diffusion couples. The regional boundaries of calcium and vanadium are easily identifiable for the CaO-V2O5 diffusion couple. Meanwhile, for the MnO2-V2O5 diffusion couple, MnO2 gradually decomposes to form Mn2O3, and vanadium diffuses into the interior of Mn2O3. Only a part of vanadium combines with manganese to form the diffusion production layer. CaV2O6 and MnV2O6 are the interfacial reaction products of the CaO-V2O5 and MnO2-V2O5 diffusion couples, respectively, whose thicknesses are 39.85 and 32.13 µm when roasted for 16 h. After 16 h, both diffusion couples reach the reaction equilibrium due to the limitation of diffusion. The diffusion coefficient of the CaO-V2O5 diffusion couple is higher than that of the MnO2-V2O5 diffusion couple for the same roasting time, and the diffusion reaction between vanadium and calcium is easier than that between vanadium and manganese.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 52174277 and 51874077), the Fundamental Funds for the Central Universities, China (No. N2225032), the China Postdoctoral Science Foundation (No. 2022M720683), and the Postdoctoral Fund of Northeastern University, China.

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Jing Wen, Hongyan Sun, Tao Jiang, Bojian Chen, Fangfang Li & Mengxia Liu

  2. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang, 110819, China

    Tao Jiang

  3. Liaoning Key Laboratory for Metallurgical Sensor and Technology, Shenyang, 110819, China

    Tao Jiang

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  1. Jing Wen
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  2. Hongyan Sun
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  3. Tao Jiang
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Correspondence to Tao Jiang.

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Wen, J., Sun, H., Jiang, T. et al. Comparison of the interface reaction behaviors of CaO-V2O5 and MnO2-V2O5 solid-state systems based on the diffusion couple method. Int J Miner Metall Mater 30, 834–843 (2023). https://doi.org/10.1007/s12613-022-2564-7

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  • DOI: https://doi.org/10.1007/s12613-022-2564-7

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