Preparation, Characterization, and Formation Mechanism of Calcium Sulfate Hemihydrate Whiskers

  • Shuzhou Wang (王舒州)
  • Deyu Chen (陈德玉)Email author
  • Keke Zhang
Advanced Materials


Calcium sulfate hemihydrate whiskers were synthesized successfully via one-step hydrothermal crystallization method using phosphogypsum at 130 °C for 240 min with an initial slurry mass fraction of 2.5wt%. The phase compositions, microstructures, thermal properties and molecular structures of asprepared samples were analyzed by XRD, ESEM, EDS, TG-DTA, and FT-IR. The influence of raw materials’ ball-milling time on the morphologies of whiskers was investigated. The effects of impurities on crystallization morphologies and length to diameter ratio (L/D) of calcium sulfate hemihydrate whiskers were studied. The results indicated that the calcium sulfate dihydrate crystalline could be translated directly into fibrous calcium sulfate hemihydrate whiskers. It was beneficial to form fine fiber structure when the ball-milling time of the raw material was 15 min. Aspect ratio of calcium sulfate hemihydrate whiskers decreased with increasing content of impurities. Moreover, the relative growth mechanism of whisker crystals via one-step hydrothermal crystallization method was discussed in detail.

Key words

calcium sulfate whiskers phosphogypsum hydrothermal crystallization 


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Copyright information

© Wuhan University of Technology and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Shuzhou Wang (王舒州)
    • 1
  • Deyu Chen (陈德玉)
    • 1
    Email author
  • Keke Zhang
    • 2
  1. 1.School of Materials Science and EngineeringSouthwest University of Science and TechnologyMianyangChina
  2. 2.Institute of Chemical EngineeringNanjing University of Science and TechnologyNanjingChina

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