| 常压盐溶液脱硫石膏转化生成α-半水石膏 |
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| 作者姓名： | 吴晓琴 童仕唐 官宝红 吴忠标 |
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| 作者单位： | 1. Department of Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;2. Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, China |
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| 基金项目： | Supported by the National High Technology Research and Development Program of China(2006AA06Z385); the Science Foundation of Wuhan University of Science and Technology(2008RC06) |
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| 摘 要： | 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 °C,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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| 关 键 词： | flue gas desulfurization gypsum crystal growth thermogravimetric analysis phase transformation |
| 收稿时间： | 2009-11-24 |
| 修稿时间： | 2009-11-24 |
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