Preparation of Calcium Sulfate Whisker by Hydrothermal Method from Flue Gas Desulfurization (FGD) Gypsum

Abstract:

In this paper, utilizing the purified flue gas desulfurization (FGD) gypsum as raw materials to prepare calcium sulfate whisker (CSW) by hydrothermal method, the effects of the dosage of crystal modifier, reaction temperature, pH, etc. on the crystal morphology of CSW were discussed. The results show that the purified FGD gypsum can replace high-quality natural gypsum for the preparation of the CSW with excellent quality. The dosage of crystal modifier (K2SO4) and reaction temperature have a significant effect on the morphology and aspect ratio of CSW, while pH and reaction time have a minor effect. When the dosage of K2SO4 is 3 wt%, pH is adjusted to 2 and the solution is reacted at 130 °C for 60 min, CSW with excellent quality can be obtained.

• Periodical: Applied Mechanics and Materials (Volumes 268-270)
• Pages: 823-826
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.268-270.823
• Online since: December 2012
• Authors: Liu Shuan Yang, Xiao Wang, Xin Feng Zhu, Ling Zhi Du
• Keywords: Calcium Sulfate Whiskers, Crystal Modifier, FGD Gypsum, Hydrothermal Method

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