硅酸盐通报2024，Vol.43Issue(10)：3510-3523,14.
氟、磷与重金属离子共掺对C3S烧成及水化进程的协同影响机理
Synergistic Influence Mechanism of Fluorine,Phosphate and Heavy Metal Ions Co-Doping on Formation and Hydration of Tricalcium Silicate
摘要
Abstract
Fluorinated sludge,as the main byproduct of refined production in the semiconductor industry,is a hazardous solid waste.In the process of co-treating fluorine-containing sludge in cement kilns,the fluorine,phosphate,and various heavy metal ions contained in the fluorinated sludge will inevitably be introduced into the cement raw material at the same time.These ions will significantly affect and change the calcination process and properties of cement raw material minerals.However,there are few studies on the impact of their coexistence on the properties of cement clinker.Therefore,this paper systematically studied the synergistic influence mechanism of fluorine,phosphate,and heavy metal ions co-doping on the calcination process,microstructure,and hydration characteristics of tricalcium silicate(C3 S).The results show that compared with the single doping of phosphorus,the co-doping of phosphate and heavy metal ions is not conducive to the firing of C3 S,while the co-doping of fluorine,phosphate,and heavy metal ions has a significant synergistic promoting effect on the firing of C3S,while significantly improving the symmetry of C3S crystal structure,resulting in more defects of different types on the surface of C3S minerals.Compared with the single doping of phosphorus,the co-doping of phosphate and heavy metal ions is beneficial for improving the initial and later hydration rates of C3S,reducing the aspect ratio of rod-shaped hydrated calcium silicate(C-S-H).The effect of co-doping of fluorine,phosphate,and heavy metal ions on the hydration performance of C3S depends on the doping ratio of each ion.However,as the doping amount of each ion increases,the acceleration period of C3S hydration will be continuously delayed,and the co-doping of the three ions will promote the increase of the aspect ratio of rod-shaped C-S-H.关键词
硅酸三钙/共掺杂/协同影响/磷酸盐/水化放热/水化产物Key words
tricalcium silicate/co-doping/synergistic influence/phosphorus/hydration heat/hydration product分类
化学化工引用本文复制引用
杜欢,达永琪,何廷树,郝建恒..氟、磷与重金属离子共掺对C3S烧成及水化进程的协同影响机理[J].硅酸盐通报,2024,43(10):3510-3523,14.基金项目
国家自然科学基金面上项目(52172027) （52172027）
国家自然科学基金青年基金(52302029) （52302029）
博士后科学基金面上资助(2023MD734200) （2023MD734200）
