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《Cement Technology》 2013-01
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Study on the Properties of By-product Gypsum as Cement Retarder from the Treatment Processing of Sulfur Chemicals Wastewater by Marble Polishing Powder

SU Da-gen, ZHOU Chuan-fu, ZHONG Ming-feng ( School of Materials Science and Engineering , South China University of Technology, Guangzhou Guangdong 510640 , China )  
It was studied in the paper by XRD and SEM that the new two stages treatment processing technology of sulfur chemicals wastewater by marble polishing powder and lime, and the effect of the properties of by-product gypsum from the processing as the retarder of cement. The results showed that:The marble polishing powder was the first neutralizer.It's proper that the lime or carbide slag was the second neutralizer. The strength of ordinary Portland cement mixed by-product gypsum as retarder was higher than that of the ordinary Portland cement using dihydrate gypsum as retarder, because the calcium carbonate in the by-product gypsum would participate in the hydration reaction and form the calcium aluminum oxide carbonate hydrate, which was helpful to improve the cement strength during the cement hydrated reaction.
【Fund】: 2010年广东省重大科技专项(2010A080804018)
【CateGory Index】: TQ172.4
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