Transformation of Flue-Gas-Desulfurization Gypsum to α-Hemihydrated Gypsum in Salt Solution at Atmospheric Pressure
Transformation of Flue-Gas-Desulfurization Gypsum to α-Hemihydrated Gypsum in Salt Solution at Atmospheric Pressure作者机构：Department of Chemical Engineering Wuhan University of Science and Technology Wuhan 430081 China Department of Environmental Engineering Zhejiang University Hangzhou 310027 China
出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)
年 卷 期：2011年第19卷第2期
页 面：349-355页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：Supported by the National High Technology Research and Development Program of China(2006AA06Z385) the Science Foundation of Wuhan University of Science and Technology(2008RC06)
主 题：flue gas desulfurization gypsum crystal growth thermogravimetric analysis phase transformation
摘 要：Direct phase transformation of flue gas desulfurization gypsum in hot salt solution at atmospheric pres-sure was *** effects of temperature,salt species,salt concentration,solids content,pH and modifier were *** 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 °C,solids mass content in the slurry 10%-30% and neutral *** 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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