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NiO reduction by Mg + C combined reducer at high heating rates

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Abstract

The mechanism and kinetics of nickel oxide reduction by Mg + C combined reducer at non-isothermal conditions in a wide range of high heating rates (100–1200 °C min−1) were studied by high-speed temperature scanner technique. It was shown that both the magnesiothermal and magnesiocarbothermal reduction processes, unlike low heating rates (5–20 °C min−1, DTA/DTG method), start beyond the melting point of magnesium and proceed via solid + liquid scheme. It was found out that the utilization of Mg + C combined reducer allows to significantly lower the reduction temperature (by about 200–400 °C) of nickel oxide as compared with exclusively magnesium or carbon reducers evidencing on the synergetic effect of combined reducers in the ternary mixture. The effective values of activation energy (Ea) for the NiO + Mg and 2NiO + Mg + C reactions were determined to be 185 ± 15 kJ mol−1 and 195 ± 15 kJ mol−1, respectively.

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Acknowledgements

The work was performed with financial support from the Committee of Science MES of Republic of Armenia (Research Grant 18T-1D051) and the Estonian Research Council Grant PSG220 (S. Aydinyan).

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Authors and Affiliations

  1. A.B. Nalbandyan Institute of Chemical Physics NAS RA, P. Sevak 5/2, 0014, Yerevan, Armenia

    M. K. Zakaryan, Kh. T. Nazaretyan, S. V. Aydinyan & S. L. Kharatyan

  2. Yerevan State University, A. Manoogian 1, 0025, Yerevan, Armenia

    M. K. Zakaryan & S. L. Kharatyan

  3. Tallinn University of Technology, Ehitajate 5, 19086, Tallinn, Estonia

    S. V. Aydinyan

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  1. M. K. Zakaryan
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  2. Kh. T. Nazaretyan
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  4. S. L. Kharatyan
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Zakaryan, M.K., Nazaretyan, K.T., Aydinyan, S.V. et al. NiO reduction by Mg + C combined reducer at high heating rates. J Therm Anal Calorim 146, 1811–1817 (2021). https://doi.org/10.1007/s10973-020-10148-5

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