Materials Reports 2021, Vol. 35 Issue (z2): 241-247 |
INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Research Progress on the Preparation of α-Calcium Sulfate Hemihydrate from Chemical Gypsum |
DONG Yiwei1, XU Zushun1,2, YANG Tingting1,2, GAO Qing1,2
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1 Key Laboratory for the Green Preparation and Application of Functional Materials of Ministry of Education, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China 2 Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Wuhan 430062, China |
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Abstract With the rapid development of China's economy and industry, the annual emissions of chemical gypsum (phosphogypsum, flue gas desulfurization gypsum, titanium gypsum, etc.) are increasing. Most of the chemical gypsum is deposited in landfill sites, which occupies a lot of land and seriously pollutes the atmosphere and groundwater. The most promising and effective treatment is to convert chemical gypsum into α-calcium sulfate hemihydrate (α-CaSO4·0.5H2O, α-HH). The performance and application direction of α-HH largely depend on its morphology control. The short columnar and whisker-like α-HH are particularly eye-catching due to its superior comprehensive performance. Based on the analysis of current status of chemical gypsum treatment, this paper reviews the research progress at home and abroad on the preparation of short columnar and whisker-like α-HH with chemical gypsum. The paper discusses the preparation methods of α-HH, the effect of crystal morphology on the performance and application of α-HH, the effect of modifier on the crystal morphology of α-HH and related mechanism. The shortcomings of existing preparation methods are pointed out, and the future development of α-HH preparation process is prospected.
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Published: 09 December 2021
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About author:: Yiwei Dong received his B.S. degree in polymer materials from Hubei University in 2017. He is currently a post graduate in School of Materials Science and Engineering, Hubei University under the supervision of Qing Gao. His research has focused on solid waste resource utilization. Zushun Xu received his M.S. degrees in Oganic Che-mistry from Hubei University in 1990, and received his Ph.D. degree in Polymer Chemistry and Physics from Zhejiang University in 1998. He worked as distinguis-hed professor of Qinyuan Scholar in Hubei University and awarded for special allowance of the Hubei provincial government. His research interests include emulsion polymerization and polymer emulsion, functional polymer microspheres, heat-resistant polymers, biomedical materials, environmentally friendly coatings and adhesive, etc. Qing Gao received his Ph.D. degree in Materials Science from Wuhan University of Science and Technology in 2007. His research interests include water-soluble polymer inverse emulsion polymerization, amphoteric polyacrylamide high-efficiency water treatment agent and solid waste resource utilization, etc. |
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