Research on Chemical Intermediates

, Volume 37, Issue 2–5, pp 449–455 | Cite as

Formation of calcium sulfate whiskers from CaCO3-bearing desulfurization gypsum

Article

Abstract

Calcium sulfate whiskers can be used as the reinforcing agents in many composites, such as polymers, ceramics, cements, and papers, etc. This paper investigated the feasibility of preparing calcium sulfate whiskers using desulfurization gypsum as the raw material. The desulfurization gypsum composed mainly of CaSO4·2H2O (93.45 wt%) and CaCO3 (1.76 wt%) were treated with dilute H2SO4 at room temperature to convert CaCO3 to CaSO4; the latter was then treated at 110–150 °C to form CaSO4·0.5H2O whiskers. The removal of the CaCO3 impurity from the desulfurization gypsum favored the formation of CaSO4·0.5H2O whiskers with high aspect ratios.

Keywords

Desulfurization gypsum Calcium sulfate whiskers Calcium carbonate Hydrothermal technology 

Notes

Acknowledgments

This work was supported by the National Nature Science Foundation of China (grant no. 50874066).

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Department of Chemical EngineeringKunming University of Science and TechnologyKunmingChina
  2. 2.Department of Chemical EngineeringTsinghua UniversityBeijingChina

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