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 CaSO 4 Á2H 2 O (93.45 wt%) and CaCO 3 (1.76 wt%) were treated with dilute H 2 SO 4 at room temperature to convert CaCO 3 to CaSO 4 ; the latter was then treated at 110-150°C to form CaSO 4 Á0.5H 2 O whiskers. The removal of the CaCO 3 impurity from the desulfurization gypsum favored the formation of CaSO 4 Á0.5H 2 O whiskers with high aspect ratios.
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