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《Environmental Science & Technology》 2010-05
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Calcium Sulfate Solubilities in the Ca-Mg-K-Cl-H_2O System of Transformation Process

HE Wei,WU Xiao-Qin,LIU Fang (Wuhan University of Science and Technology,Wuhan 430081,China)  
Flue gas desulphurisation(FGD)could transform to hemihydrate gypsum in salt solution at atmospheric pressure. It is an effective way to realize FGD resource utilization. This article focus on the solubility of gypsum in different types and concentrations of salt solution in the transformation processes,as an important parameter in FGD crystal transformation. In the experimental process,solubility of calcium sulfate was determined by dissolved balance method. Experimental results shows that the solid calcium sulfate could achieve dissolution equilibriumsalt in 4 hours. The temperature,salt type and concentration has a significant impact on the solubility. In CaCl2 solution,as a result of the existence of the same ion effect,with the increase of salt concentration the solubility of CaSO·42H2O decreased. In MgCl2 solution,when the concentration less than 4%,with the increase of salt concentration the solubility of CaSO·42H2O increased,while higher than 4%,the solubility of CaSO·42H2O was not obvious with the concentration increasing. In the KCl solution,the general trend is that the solubility of CaSO·42H2O increased with the concentration increasing. In the mixed salt solution,the solubility of CaSO·42H2O reduced with the concentration increasing,it shows that the same ion effect has the most effect.
【Fund】: “863”国家高技术研究发展计划(2006AA06Z385)
【CateGory Index】: TQ177.3
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