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Analysis of Magnesia Carbothermic Reduction Process in Vacuum

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Abstract

The mechanism of magnesia carbothermic reduction was investigated experimentally in a reduction reaction process in vacuum. The thermodynamic calculation results showed that the initial reduction temperature between MgO and C was 1500 K (1227 °C) at 50 Pa. Other reduction reactions did not occur between the temperature 300 K and 1900 K (27 °C and 1627 °C) and 30 to 100 Pa. Based on the analysis of experimental results, the initial reduction reaction temperature was 1553 K (1280 °C), and it matched well with the thermodynamic calculations. The gas–solid reaction between MgO and CO did not occur at 1723 K (1450 °C), 30 to 100 Pa. Therefore, the main reduction reaction was MgO(s) + C(s) = Mg(g)+ CO(g) in vacuum. This reaction belonged to the solid–solid reaction type, the condensing product was obtained in the condensation zone, and the main component of the product was metal magnesium. A little magnesia was also obtained in the condensing product due to the reverse reaction.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 51304095); Science and Technology Planning Project of Yunnan Province, China (No. 2013FZ029); The Program for Innovative Research Team in University of Ministry of Education of China (Grant No. IRT1250).

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Authors and Affiliations

  1. National State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization, Kunming University of Science and Technology, Kunming, 650093, P.R. China

    Yang Tian (Associate Professor), Bao-qiang Xu (Associate Professor), Cheng-bo Yang (Master Student), Bin Yang (Professor), Tao Qu (Lecturer), Hong-xiang Liu (Ph.D. Student), Yong-nian Dai (Academician) & Da-chun Liu (Professor)

  2. National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming, 650093, P.R. China

    Yang Tian (Associate Professor), Bao-qiang Xu (Associate Professor), Cheng-bo Yang (Master Student), Bin Yang (Professor), Tao Qu (Lecturer), Hong-xiang Liu (Ph.D. Student), Yong-nian Dai (Academician) & Da-chun Liu (Professor)

  3. Key Laboratory of Non-Ferrous Metals Vacuum Metallurgy of Yunnan Province, Kunming, 650093, P.R. China

    Yang Tian (Associate Professor), Bao-qiang Xu (Associate Professor), Cheng-bo Yang (Master Student), Bin Yang (Professor), Tao Qu (Lecturer), Hong-xiang Liu (Ph.D. Student), Yong-nian Dai (Academician) & Da-chun Liu (Professor)

  4. College of Metallurgy and Energy engineering, Kunming University of Science and Technology, Kunming, 650093, P.R. China

    Yang Tian (Associate Professor), Bao-qiang Xu (Associate Professor), Cheng-bo Yang (Master Student), Bin Yang (Professor), Tao Qu (Lecturer), Hong-xiang Liu (Ph.D. Student), Yong-nian Dai (Academician) & Da-chun Liu (Professor)

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  1. Yang Tian
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  2. Bao-qiang Xu
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  3. Cheng-bo Yang
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  4. Bin Yang
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  6. Hong-xiang Liu
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  7. Yong-nian Dai
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  8. Da-chun Liu
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Corresponding author

Correspondence to Bin Yang.

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Manuscript submitted July 30, 2013.

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Tian, Y., Xu, Bq., Yang, Cb. et al. Analysis of Magnesia Carbothermic Reduction Process in Vacuum. Metall Mater Trans B 45, 1936–1941 (2014). https://doi.org/10.1007/s11663-014-0106-z

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  • DOI: https://doi.org/10.1007/s11663-014-0106-z

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