Transformation of flue gas desulfurization (FGD) gypsum to β-CaSO4·0.5H2O whiskers using facile water treatment

Bakshi, Payal and Pappu, Asokan and Kumar Bharti, Dhiraj (2022) Transformation of flue gas desulfurization (FGD) gypsum to β-CaSO4·0.5H2O whiskers using facile water treatment. Materials Letters, 308. pp. 1-5. ISSN 0167-577X

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A novel way for the transformation of flue gas desulfurization (FGD) gypsum, an industrial by-product to β-CaSO4·0.5H2O whiskers is investigated for calcium sulfate-rich alternative construction material. As the consumption of gypsum products is increasing in the construction industry and a limited amount of natural gypsum is available, herein facile water treatment is used to generate fine tubular particles by recrystallization and growth of β-CaSO4·0.5H2O without any chemical for the first time. Remarkable properties of FGD gypsum are characterized with mean particle size of 42.875–48.759 µm, bulk density of 1.08–1.21 g/cm3, and specific gravity of 3.06–3.35. XRD, FTIR, WD-XRF, FESEM-EDS, and HR-TEM analysis confirm the composition and morphology of the synthesized material. XRD pattern of treated FGD gypsum confirms the presence of highly crystalline β-CaSO4·0.5H2O. FESEM micrographs confirm the micro-needle type morphology with a very high aspect ratio of 25:1.Results showed that magnetic stirring improves the removal efficacy of impurities. This study will open the perspective for the development of FGD gypsum whiskers with a very high aspect ratio and will pave the way for future investigation for a green alternative of natural gypsum for construction applications. © 2021 Elsevier B.V.

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Additional Information: The authors are grateful to the Director Dr. Avanish Kumar Srivastava, CSIR-AMPRI, Bhopal for giving the permission to publish this work. The authors would like to thank Mr. Anoop Khare for FESEM-EDS. The authors are also thankful to Dr. Manoj Kumar Gupta for his kind support and encouragement.
Uncontrolled Keywords: Ceramics; Characterization; Construction material; FGD gypsum; Microstructure; Treatment
Subjects: Electrical Engineering
Materials Engineering > Materials engineering
Divisions: Department of Electrical Engineering
Department of Material Science Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 14 Jul 2022 07:28
Last Modified: 14 Jul 2022 07:28
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