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Elemental sulfur recovery from FGD gypsum and calcium cyclic utilization in coal-fired power plants

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Abstract

Flue gas desulfurization (FGD) gypsum mainly contains gypsum, which comes from the FGD by using lime or limestone. The effects of calcining temperature and time on calcium sulfide preparation were explored. The gypsum completely decomposed into calcium sulfide by calcining at 900 °C for 30 min. The effect of time on CaS and CO2 reaction were also explored in aqueous solution. The main phase was calcite phase after reaction 6 h, with nearly cubic particles and 1–2 µm in diameter, which calcite can be reused in FGD process. Hydrogen sulfide was produced when CaS reacted with CO2. And then, irregular particle and pellets of elemental sulfur, with 0.5–5 μm in diameter, were obtained by the H2S oxidation in Fe(III) chelate solution.

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Acknowledgements

This work was supported by the Research Fund of the Sichuan Science and Technology Program of China (2020YFS0334), Natural Science Foundation of Southwest University of Science and Technology (19zx7130) and State Key Laboratory of Solid Waste Reuse for Building Materials (SWR-2021-001).

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Author notes

  1. Hongbin Tan and Min Ye contributed equally to this work and should be regarded as co-first authors.

Authors and Affiliations

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

    Hongbin Tan, Min Ye, Xuemei Su & Xiaoling Ma

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

    Faqin Dong

  3. State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing Building Materirals Academy of Science Research, Beijing, 100041, China

    Feihua Yang

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  1. Hongbin Tan
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  4. Xiaoling Ma
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Correspondence to Hongbin Tan.

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Tan, H., Ye, M., Su, X. et al. Elemental sulfur recovery from FGD gypsum and calcium cyclic utilization in coal-fired power plants. J Therm Anal Calorim 147, 14115–14121 (2022). https://doi.org/10.1007/s10973-022-11724-7

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