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Hydration of Activated Anhydrate Phosphogypsum
YANG MinYANG Min(1978-) : Associate Prof.; ; E-mail: minjy@
Funded by the National Natural Science Foundation of China (Project NO. 50802019)
, QIAN Jueshi 2
(1 College of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550003, China
2 College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China)
Abstract: Phosphogypsum(PG) calcined at 500℃ was activated by K2SO4 and salt lime with loose structure as seed crystal. To determine the effect of activation, hydration of the anhydrate PG activated was investigated by examination of the setting time, the proportion of hydrated anhydrate PG, the microstructure of the hardenite and the resistance to water. Results suggest that activated anhydrate PG hydrates much more rapidly than that without activators. The activated anhydrate PG has proper setting time and hydrated proportion. The resistance to water was greatly improved. SEM photos show that the set activated PG has hydrated products of rod-like and closely connected crystals. The different addition of activator leads to p