Materials Reports  2022, Vol. 36 Issue (Z1): 22020111-5 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
|
|
|
|
|
| Performance Change and Application of Calcined Phosphogypsum Before and After Washing and Grinding Pre-treatment |
| LIU Meng, WANG Qing, ZHU Chen, DUN Peng, LIU Yong
|
| Wuhan Sanyuan Special Building Materials Co., Ltd., Wuhan 430080, China |
|
|
|
|
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.
|
|
Published: 05 June 2022
Online: 2022-06-08
|
|
|
|
|
1 Wang Q, Zhuang S, Jia R. Journal of Thermal Analysis and Calorimetry, 2019, 136(4), 1575.
2 叶学东. 磷肥与复肥, 2020, 35(7), 1.
3 陈嘉懿. 预处理工艺对磷石膏性能的影响及作用机理研究. 硕士学位论文,武汉理工大学, 2012.
4 张柱. 磷石膏中氟和可溶性磷固化及含水率控制方法研究.硕士学位论文, 重庆大学, 2019.
5 李美. 磷石膏品质的影响因素及其建材资源化研究. 博士学位论文, 重庆大学, 2012.
6 Taher M A. Resources, Conservation and Recycling, 2007, 52(1), 28.
7 彭家惠,林常青,彭志辉,等. 新型建筑材料, 2000(9), 6.
8 任婷艳,杨家宽,奚蓉.广东化工, 2018, 45(10), 97.
9 Liu Y, Zhang Q, Chen Q, et al. Minerals, 2019, 9(3), 175.
10 吴长江. 化工设计通讯, 2018, 44(9), 147.
11 刘路珍,陈德玉,刘宇浩,等.非金属矿,2014, 37(3), 30.
12 钟雯. 居业, 2021(8), 203.
13 邓浩. 热处理过程磷石膏的相变行为和理化性质研究. 硕士学位论文, 贵州大学, 2020.
14 Mashifana T. E3S Web of Conferences, 2019, 96, 2004.
15 Potgieter J H, Potgieter S S, Mccrindle R I, et al. Cement and Concrete Research, 2003, 33(8), 1223.
16 Zolotukhin S N, Kukina O B, Abramenko A A, et al. IOP Conference Series: Earth and Environmental Science. IOP Publishing, 2017, 90(1), 012088.
17 吴照洋,张永兴,张利珍,等. 无机盐工业, 2021, 53(9), 67.
18 Singh N B, Middendorf B. Progress in Crystal Growth and Characterization of Materials, 2007, 53(1), 57.
19 Liu S, Ouyang J, Ren J. Construction and Building Materials, 2020, 243, 118226.
20 Yang L, Zhang Y, Yan Y. Journal of Cleaner Production, 2016, 127, 204. |
|
|
|
渝公网安备50019002502923号 © Editorial Office of Materials Reports.
