关键词: CaO-MgO-SiO2-H2O体系;水热反应;热力学;转化机制;富镁低碱度钢渣

Abstract: The reaction characteristic of CaO-MgO-SiO2-H2O system underhydrothermal condition was investigated by thermodynamic analysis.It shows that in the CaO-MgO-SiO2-H2O system,CaO firstly reacts with SiO2，and the hydrated calcium silicate is the final product.MgO only reacts with surplus SiO2 to form hydrated magnesium silicate.When MgO is in the form of solid solution in the hydrated calcium silicate,it can promote the transformation of tobermorite to xonotlite,but has little influence on that of gyrolite to truscottite,otherwise the temperature of the change increases from low-temperature hydrated calcium silicate to high-temperature hydrated calcium silicate.The results indicate that merwinite is superior to diopside in the reaction activity in Ca-Mg-Si minerals in the steel slag,and the reaction activity of monticellite and akermanite is between them.