Activation of Anhydrate Phosphogypsum by K_2SO_4 and Hemihydrate Gypsum 被引量：4

Activation of Anhydrate Phosphogypsum by K_2SO_4 and Hemihydrate Gypsum

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摘要 Lime pretreated phosphogypsum（PG） was calcined at 500 ℃ to produce anhydrate gypsum cement. Due to the slow hydration of anhydrate gypsum, additives, K2SO4 and hemihydrate gypsum were selected to accelerate the hydration of anhydrate. The hydration characteristics, the resistance to hydrodynamic water, and the mineralogical studies were investigated. The experimental results suggest that activated by K2SO4 and hemihydrate, anhydrate PG hydrates much more rapidly than that in the presence of only K2SO4 or in the absence of additives. The binder has proper setting time, good strength development, and relatively better resistance to water. The hardened binder has hydrated products of rod or stick like shaped dihydrate gypsum crystals. Lime pretreated phosphogypsum（PG） was calcined at 500 ℃ to produce anhydrate gypsum cement. Due to the slow hydration of anhydrate gypsum, additives, K2SO4 and hemihydrate gypsum were selected to accelerate the hydration of anhydrate. The hydration characteristics, the resistance to hydrodynamic water, and the mineralogical studies were investigated. The experimental results suggest that activated by K2SO4 and hemihydrate, anhydrate PG hydrates much more rapidly than that in the presence of only K2SO4 or in the absence of additives. The binder has proper setting time, good strength development, and relatively better resistance to water. The hardened binder has hydrated products of rod or stick like shaped dihydrate gypsum crystals.

作者杨敏

机构地区 College of Chemistry and Chemical Engineering

出处《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第6期1103-1107,共5页 武汉理工大学学报（材料科学英文版）

基金 Funded by the National Natural Science Foundation of China (No. 50802019)

关键词 ACTIVATION anhydrate phosphogypsum hemihydrate gypsum HYDRATION activation anhydrate phosphogypsum hemihydrate gypsum hydration

分类号 TQ177.31 [化学工程—硅酸盐工业]

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1Nurhayat Degirmenei. The Using of Waste Phosphogypsum and Natural Gypsum in Adobe Stabilization[J]. Construction and Building Materials, 2008,(22 ):1 220-1 224.
2YangMin, QianJueshi,PangYing. Activation of Fly Ash-lime Systems Using Calcined Phosphogypsum [J]. Construction and Building Materials, 2008,(5): 1 004-1 008.
3MA Taher. Influence of Thermally Treated Phosphogypsum on the Properties of Portland Slag Cement[J]. Resources Conservation and Recycling, 2007,(52/1): 28-38.
4Samia Azabou, Tahar Mechichi, Bharat KC Patel, Sami Sayadi. Isolation and Characterization of a Mesophilic Heavy-metalstolerant Sulfate-reducing Bacterium Desulfomicrobium sp. from an Enrichment Culture Using Phosphogypsum as a Sulfate Source[J]. Journal of Hazardous Materials,2007,140(1-2): 264-270.
5Semra ~oruh, Osman Nuri Ergun. Use of Fly Ash, Phosphogypsum and Red Mud as a Liner Material for the Disposal of Hazardous Zinc Leach Residue Waste[J]. Journal of Hazardous Materials, 2010,(173/1-3): 468-473.
6Mun KJ, Hyoung WK, Lee CW, So SY, et al. Basic Properties of Non-sintering Cement Using Phosphogypsum and Waste Lime as Activator[J]. Construction and Building Materials, 2007, 21(6): 1 342-1 350.
7Guan Baohong, Yang Liuchun, Wu Zhongbiao, et al. Preparation of c~-calcium Sulfate Hemihydrate from FGD Gypsum in K, Mg-containing Concentrated CaC12 Solution Under Mild Conditions[J]. Fuel 2009,88(7) :1 286-1 293.
8Guo Xiao Lu, Shi Hui Sheng. Thermal Treatment and Utilization of Flue Gas Desulphurization Gypsum as an Admixture in Cement and Concrete[J]. Construction and Building Materials, 2008,22(7):1 471-1 476.
9Manjit Singh, Mridul Garg. Durability of Cementing Binders Based on Fly Ash and Other Wastes[J]. Construction and Building Materials, 2007,(21):2 012-2 016.
10Singh NB, Middendorf B. Calcium Sulphate Hemihydrate Hydration Leading to Gypsum Crystallization[J]. Progress in Crystal Growth and Characterization of Materials, 2007,53(1): 57-77.