硅酸盐学报2018，Vol.46Issue(2)：206-211,6.DOI:10.14062/j.issn.0454-5648.2018.02.02
水热合成-低温煅烧硫铝酸钙水泥熟料矿物的形成过程
Mineral Formation Mechanism of Calcium Sulphoaluminate Cement Clinker in Hydrothermal-Low Temperature Sintering Process
摘要
Abstract
The low-temperature type calcium sulphoaluminate (C4A3$) - belite cement clinker was preparedvia hydrothermal synthesis-low-temperature calcination. The hydrothermal synthesis products and minerals during the calcination of clinker were analyzed by X-ray diffraction, thermogravimetric analysis/differential scanning calorimetry, and scanning electron microscopy, respectively, and the formation mechanism of C4A3$ with low-temperature characterizations was discussed. The results show that the specific surface area of hydrothermal product in hydrothermal reaction at 90℃is 76800 m2/kg, C12A7 appears at 650℃ due to AFm and AFt (i.e., hydrated calcium sulphoaluminate), C4A3$ begins to form at 750℃, and C4A3$ completely forms at 1100℃. The morphology of C4A3$ is pyritohedron, and the mass fraction of SO3 has little change in the calcination process. The clinker sintering temperature is 200～250℃,which is lower than that of the conventional direct calcination. C4A3$ formed at a low temperature is due to the presence of hydrothermal synthesis product with the great specific surface area, and the formation of C4A3$ at a low temperature is a main reason for the calcination process without sulfur emissions.关键词
硫铝酸钙水泥熟料/水热合成/低温煅烧Key words
calcium sulphoaluminate cement clinker/hydrothermal synthesis/low-temperature calcination分类
化学化工引用本文复制引用
郭伟,王春,俞平胜,蒋金海,文寨军..水热合成-低温煅烧硫铝酸钙水泥熟料矿物的形成过程[J].硅酸盐学报,2018,46(2):206-211,6.基金项目
国家重点研发计划项目(2016YFB0303600) （2016YFB0303600）
江苏省生态建材与环保装备协同创新中心项目(GX2015304) （GX2015304）
江苏省经贸委项目(20169343). （20169343）
