Abstract: The difference in the physical properties of calcined phosphogypsum before and after water washing and grinding was invested, the diffe-rence of contents of hydration products and microscopic morphology of calcined phosphogypsum before and after washing were also analysed with X-ray diffraction and SEM, then the influencing mechanism was interpreted. Besides, and the pre-treated calcined phosphogypsum was applied to the self-leveling. The comparative experiments results showed that the water washing pre-treatment could effectively remove the soluble phosphorus and fluorine in the phosphogypsum, the 2 h compressive strength increased from 4.7 MPa to 5.7 MPa, and the whiteness increased from 49.2% to 69.4%; grinding pre-treatment could effectively improve the morphology and particle gradation of phosphogypsum particles, which improved mechanical properties; the content of tricalcium phosphate(TCP) and fluoroapatite in phosphogypsum without washing pre-treatment hydrated for 1 day were 4.6wt% and 0.8wt% . After washing pre-treatment, the harmful impurities were not detected in the hydration products, and the morphology of dihydrate gypsum changed from sheet-like to rod-like structure; adding appropriate amount of cement could improve the pH and particle distribution of the gypsum self-leveling slurry, which was beneficial to improve the flow performance and absolute dry strength.
刘猛, 王庆, 朱晨, 顿鹏, 刘勇. 水洗和粉磨预处理前后煅烧磷石膏的性能变化及应用[J]. 材料导报, 2022, 36(Z1): 22020111-5.
LIU Meng, WANG Qing, ZHU Chen, DUN Peng, LIU Yong. Performance Change and Application of Calcined Phosphogypsum Before and After Washing and Grinding Pre-treatment. Materials Reports, 2022, 36(Z1): 22020111-5.
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2022, Vol. 36 
