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Preparation of Anhydrate Phosphogypsum Binders

Preparation of Anhydrate Phosphogypsum Binders
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摘要 In this work,phosphogypsum(PG) with a small amount of lime was thermally pretreated at 450 ℃ to produce anhydrate gypsum for the purpose of searching new ways for utilization of waste PG. Additives,K2SO4 and one selected seed crystal(SC),were used as activator for anhydrate PG. The hydration characteristics of the anhydrate PG binders were investigated by determination of the setting time,the ratio of hydrated anhydrate PG,the compressive strength development,and the microstructure of the hardenite. The resistance to water was studied by measuring mass loss of binders exposed to hydrodynamic water. Results suggest that activated by K2SO4 and SC,anhydrate PG hydrates much more rapidly than that without additives. The anhydrate PG binder with K2SO4 and SC has proper setting time and good strength developments. SEM photos show that the set binders have hydrated products of rodlike and regularly shaped crystals. Those crystals connected closely,and the hardenite has a compact structure,which is beneficial to the obtainment of good properties. In this work,phosphogypsum（PG） with a small amount of lime was thermally pretreated at 450 ℃ to produce anhydrate gypsum for the purpose of searching new ways for utilization of waste PG. Additives,K2SO4 and one selected seed crystal（SC）,were used as activator for anhydrate PG. The hydration characteristics of the anhydrate PG binders were investigated by determination of the setting time,the ratio of hydrated anhydrate PG,the compressive strength development,and the microstructure of the hardenite. The resistance to water was studied by measuring mass loss of binders exposed to hydrodynamic water. Results suggest that activated by K2SO4 and SC,anhydrate PG hydrates much more rapidly than that without additives. The anhydrate PG binder with K2SO4 and SC has proper setting time and good strength developments. SEM photos show that the set binders have hydrated products of rodlike and regularly shaped crystals. Those crystals connected closely,and the hardenite has a compact structure,which is beneficial to the obtainment of good properties.
作者 YANG M XIE Y CHENG J K PANG Y
机构地区 School of Chemistry and Chemical Engineering
出处 《武汉理工大学学报》 CAS CSCD 北大核心 2010年第17期193-195,200,共4页 Journal of Wuhan University of Technology
基金 support provided by the National Natural Science Foundation of China (Project NO.50802019) the Introduction of Research Personnel Foundation of Guizhou University(Project No.2008019)
关键词 anhydrate PG binders ACTIVATOR HYDRATION anhydrate PG binders activator hydration
分类号 TU52 [建筑科学—建筑技术科学]
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参考文献11

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武汉理工大学学报
2010年 第17期
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