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Thermal decomposition characteristics of low-grade rhodochrosite ore in N2, CO2 and air atmosphere

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Abstract

Roasting is an essential process before ammonia leaching of low-grade rhodochrosite ore. Thermal decomposition characteristics and phase transformation rules of low-grade rhodochrosite ore with a particle size of less than 74 µm in N2, CO2 and air were studied. MnCO3, MgCO3 and CaCO3 in rhodochrosite are decomposed into MnO, MgO and CaO at 339 ℃, 306 ℃ and 842 ℃, respectively. MnO is oxidized to MnO2, Mn2O3 and Mn3O4 at 339 ℃, 533 ℃ and 1005 ℃, respectively. The TG/DTA and phase transformation results indicated that by thermal decomposition of rhodochrosite ore in air, N2 and CO2, MnCO3 is converted into Mn2O3, MnO and MnO, respectively. MnCO3 is converted to MnO at a higher temperature in a carbon dioxide atmosphere (512 ℃) than in a nitrogen atmosphere (400 ℃).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400030, China

    Zhongbing Tu, Xiaoping Liang, Chengbo Wu & Yu Wang

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  1. Zhongbing Tu
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  2. Xiaoping Liang
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  3. Chengbo Wu
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  4. Yu Wang
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Correspondence to Xiaoping Liang.

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Tu, Z., Liang, X., Wu, C. et al. Thermal decomposition characteristics of low-grade rhodochrosite ore in N2, CO2 and air atmosphere. J Therm Anal Calorim 147, 6481–6488 (2022). https://doi.org/10.1007/s10973-021-10974-1

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  • DOI: https://doi.org/10.1007/s10973-021-10974-1

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