Journal of Thermal Analysis and Calorimetry

, Volume 139, Issue 2, pp 933–939 | Cite as

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

  • Xiaoling Ma
  • Hongbin TanEmail author
  • Faqin Dong
  • Bowen Li
  • Jin Wang
  • Xiaochun He
  • Changrong Liu


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.


Ammonium jarosite Low-temperature decomposition Troilite Activation energy 



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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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • Xiaoling Ma
    • 1
    • 2
  • Hongbin Tan
    • 1
    • 2
    Email author
  • Faqin Dong
    • 3
  • Bowen Li
    • 4
  • Jin Wang
    • 1
  • Xiaochun He
    • 1
  • Changrong Liu
    • 1
  1. 1.State Key Laboratory of Environment-friendly Energy Materials, School of Materials Science and EngineeringSouthwest University of Science and TechnologyMianyangChina
  2. 2.Shaanxi Engineering Center of Metallurgical Sediment Resource, Shaanxi University of TechnologyHanzhongChina
  3. 3.Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry EducationSouthwest University of Science and TechnologyMianyangChina
  4. 4.Department of Materials Science and EngineeringMichigan Technological UniversityHoughtonUSA

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