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Influence of troilite on the decomposition of ammonium jarosite and estimated activation energy

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Abstract

Jarosite method is most widely employed to remove iron through the zinc hydrometallurgical process, and ammonium jarosite sediment is produced. The low-temperature thermal decomposition of the ammonium jarosite sediment is desirable to recover natural resources and protect the environment. Herein, we aimed to study the influence of troilite addition on thermal decomposition of hydrothermally synthesized ammonium jarosite. The ammonium jarosite gets decomposed at 300 °C and results in a hematite crystal phase. The hematite, pyrite and magnetite phases have been observed at 400 °C. Furthermore, the hematite and magnetite are present as major phases and pyrrhotite phase has been detected as the minor phase at 500 °C. In addition, the amount of magnetite and hematite exhibited linear and inverse relationships with heat treatment temperature, respectively, in the temperature range of 500–800 °C. Also, the sulfur has been completely decomposed during the jarosite process after roasting at 500 °C and the estimated activation energy value (Ea) of 503.4 kJ mol−1 has been obtained from \(\ln (v/T_{\text{p}}^{2} )\) versus 1/Tp plots. Troilite can improve sulfur elimination from ammonium jarosite at low temperature.

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Acknowledgements

This work was supported by the Research Fund of the Sichuan Science and Technology Program of China (2017GZ0401), Xinjiang Science and Technology Program of China (2017E0207) and Natural Science Foundation of Southwest University of Science and Technology (18zx7101).

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Authors and Affiliations

  1. State Key Laboratory of Environment-friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, Sichuan, China

    Xiaoling Ma, Hongbin Tan, Jin Wang, Xiaochun He & Changrong Liu

  2. Shaanxi Engineering Center of Metallurgical Sediment Resource, Shaanxi University of Technology, Hanzhong, 723000, Shaanxi, China

    Xiaoling Ma & Hongbin Tan

  3. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry Education, Southwest University of Science and Technology, Mianyang, 621010, Sichuan, China

    Faqin Dong

  4. Department of Materials Science and Engineering, Michigan Technological University, 1400 Townsend Dr., Houghton, MI, 49931, USA

    Bowen Li

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  1. Xiaoling Ma
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  2. Hongbin Tan
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  3. Faqin Dong
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  5. Jin Wang
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Correspondence to Hongbin Tan.

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Ma, X., Tan, H., Dong, F. et al. Influence of troilite on the decomposition of ammonium jarosite and estimated activation energy. J Therm Anal Calorim 139, 933–939 (2020). https://doi.org/10.1007/s10973-019-08480-6

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  • DOI: https://doi.org/10.1007/s10973-019-08480-6

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