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Preparation of ammonium jarosite and estimated activation energy of thermal decomposition in reducing atmosphere

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Abstract

Jarosite method is most widely employed to remove iron in the zinc metal hydrometallurgical process and ammonium jarosite sediment is produced. The sediment contains metals and other toxic elements, which have environmental impacts. Thermal decomposition of the sediment is favored as it can recover valuable metals and protect the environment. Ammonium jarosite was synthesized using the hydrothermal method. The influence of ammonium bicarbonate and sulphuric acid on product’s morphology was detected. Fine crystals were obtained by adding sulphuric acid. Ammonium bicarbonate did not obviously have an effect on the crystal’s morphology. The influence of ammonium bicarbonate and sulphuric acid on the product phase and output was not significant. The influence of acticarbon on the thermal decomposition of ammonium jarosite was investigated. At low temperature (≤ 400 °C), the carbon did not obviously have an effect on the decomposition of ammonium jarosite. But, at a high temperature (> 400 °C), the carbon can affect the decomposition temperature and intermediate phase of ammonium jarosite. The decomposition temperature of ammonium jarosite with acticarbon was lower than ammonium jarosite alone. The activation energy value Ea = 197.7 and 281.4 kJ·mol−1 for treated jarosite and treated jarosite with acticarbon were obtained, respectively, in which the jarosites were pre-treated at 400°C for 2 h.

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Acknowledgements

This work was supported by Sichuan Science and Technology Development Program of China (2017GZ0380), the Postdoctoral Science Foundation of China (2016M590900), Shaanxi Science and Technology Development Program of China (2016XT-16), Postdoctoral Science Foundation of Southwest University of Science and Technology (16zx7127).

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Correspondence to Hongbin Tan.

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Ma, X., Tan, H., Liu, J. et al. Preparation of ammonium jarosite and estimated activation energy of thermal decomposition in reducing atmosphere. J Therm Anal Calorim 135, 2565–2572 (2019). https://doi.org/10.1007/s10973-018-7441-2

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  • DOI: https://doi.org/10.1007/s10973-018-7441-2

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