Transformation of Flue-Gas-Desulfurization Gypsum to α-Hemihydrated Gypsum in Salt Solution at Atmospheric Pressure

吴晓琴; 童仕唐; 官宝红; 吴忠标

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Transformation of Flue-Gas-Desulfurization Gypsum to α-Hemihydrated Gypsum in Salt Solution at Atmospheric Pressure

Updated：2026-01-06

- Transformation of Flue-Gas-Desulfurization Gypsum to α-Hemihydrated Gypsum in Salt Solution at Atmospheric Pressure
- Chinese Journal of Chemical Engineering Vol. 19, Issue 2, Pages: 349-355(2011)
- Affiliations：
  
  1. Department of Chemical Engineering, Wuhan University of Science and Technology,Wuhan,China,430081
  2. Department of Environmental Engineering, Zhejiang University,Hangzhou,China,310027
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2011
- Accepted：
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WU Xiaoqin, TONG Shitang, GUAN Baohong, WU Zhongbiao. Transformation of Flue-Gas-Desulfurization Gypsum to α-Hemihydrated Gypsum in Salt Solution at Atmospheric Pressure[J]. , 2011, 19(2): 349-355.
DOI：

WU Xiaoqin, TONG Shitang, GUAN Baohong, WU Zhongbiao. Transformation of Flue-Gas-Desulfurization Gypsum to α-Hemihydrated Gypsum in Salt Solution at Atmospheric Pressure[J]. , 2011, 19(2): 349-355. DOI：

摘要

Abstract

Direct phase transformation of flue gas desulfurization gypsum in hot salt solution at atmospheric pres-sure was investigated.The effects of temperature

salt species

salt concentration

solids content

pH and modifier were examined.The crystals obtained under different conditions and solubility of calcium sulfate in contact with solid gypsum were also determined.α-Calcium sulfate hemihydrate crystals of stubby columnar shape and regular pentahedral sides were obtained under the following conditions:salt concentration 20%-30%

operation tempera-ture 95-100℃

solids mass content in the slurry 10%-30% and neutral pH.Thermodynamic analysis revealed that phase transformation of calcium sulfate dihydrate to α-calcium sulfate hemihydrate occurs because of the difference in solubilities between the two solid gypsum phases in this system.

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