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Effects of kaolinite addition on the melting characteristics of the reaction between phosphogypsum and CaS

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Abstract

Phosphogypsum is a type of solid waste that causes severe environmental damage. To utilize phosphogypsum more effectively, the present study investigated the melting characteristics of the reaction between phosphogypsum and CaS. FactSage was used to calculate the phase equilibrium and to predict the melting behavior at high temperatures. The analysis comprised an ash-melting temperature test, thermogravimetric analysis, differential thermal analysis, and scanning electron microscopy. The results showed that kaolinite had major effects on the ash-melting temperature and the ash-melting behavior, where the effects depended on the kaolinite content. The ash-melting temperature increased with the addition of kaolinite. With a kaolinite content of 10 %, the increases in the deforming temperature, softening temperature, hemispheric temperature, and flowing temperature were 50, 42, 49, and 65 °C, respectively. The results of the simulation and experimental analyses were in good agreement.

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Acknowledgements

This research was supported by the National High Technology Research and Development Program of China (Grant No. 2011AA06A106), which is gratefully acknowledged. FactSage 6.1 was provided by Kunming University of Science and Technology.

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Authors and Affiliations

  1. School of Chemical Engineering, Sichuan University, Chengdu, 610064, People’s Republic of China

    Lijing Zhao, Tianming Wan, Xiushan Yang, Lin Yang, Xingjian Kong, Zhiye Zhang & Xinlong Wang

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  1. Lijing Zhao
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  2. Tianming Wan
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  3. Xiushan Yang
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  4. Lin Yang
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  5. Xingjian Kong
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  6. Zhiye Zhang
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  7. Xinlong Wang
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Correspondence to Xinlong Wang.

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Zhao, L., Wan, T., Yang, X. et al. Effects of kaolinite addition on the melting characteristics of the reaction between phosphogypsum and CaS. J Therm Anal Calorim 119, 2119–2126 (2015). https://doi.org/10.1007/s10973-015-4400-z

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  • DOI: https://doi.org/10.1007/s10973-015-4400-z

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