Experimental Study on Hemihydrate Phosphogypsum Modified by Magnesium Oxysulfate Cement

Abstract

Abstract: Aiming at the problems of low mechanical properties and poor water resistance of hardened hemihydrate phosphogypsum, magnesium oxysulfate cement was used to modify hemihydrate phosphogypsum. The effects of magnesium oxysulfate cement content on setting time, mechanical properties and water resistance of hemihydrate phosphogypsum were investigated. The mechanism of magnesium oxysulfate cement modified hemihydrate phosphogypsum was analyzed from a microscopic point of view. The results show that adding magnesium oxysulfate cement significantly delays the final setting time of hemihydrate phosphogypsum and ensures construction operation time of hemihydrate phosphogypsum. Sulfate ions that dissolved and ionized in hemihydrate phosphogypsum participate in the hydration process of magnesium oxysulfate cement, forming a stable 517 phase filled in dihydrate gypsum, resulting in a great improvement of mechanical properties and water resistance of hemihydrate phosphogypsum.

Key words: phosphogypsum, magnesium oxysulfate cement, setting time, compressive strength, water resistance

CLC Number:

TQ177

WENG Youfa, LI Moxian, WANG Chaofan, CHEN Bing. Experimental Study on Hemihydrate Phosphogypsum Modified by Magnesium Oxysulfate Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 2115-2120.

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