Thermodynamics and Kinetics of Calcium Sulphoaluminate  

作　　者：郭惠玲 谢峻林 

机构地区：[1]Key Laboratory for Silicate Materials Science and Engineering of Ministry of Education, Wuhan University of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2011年第4期719-722,共4页武汉理工大学学报（材料科学英文版）

基　　金：Founded by the National Natural Science Foundation of China(50972116)

摘　　要：The formation process of calcium suphoaluminate（C4A3S） was investigated by the X-ray diffraction technique and then the thermodynamics was analyzed, finally the kinetics of which was studied by SC-132. XRD results show that the formation of C4A3S is accomplished in three different kinds of ways： one is by solid reaction of Ca （OH）2/ CaO, Al2O3 and CaSO4, other two ways are through such interstitial products as CaO·Al2O3 and CaO·2Al2O3. The formation thermodynamics shows that C4A3S begins to form at 900 ℃-1 000 ℃ and increases as temperature rising; the quantity of reaches the highest at 1 300 ℃-1 350 ℃ and then falls at 〉1350℃. Kinetics study shows that the formation rate of C4A3S can be described as first-order kinetics at high temperature, and it belongs to the random nucleation growth mechanism. The apparent activation energy is 456.37 kJ·mol-1 and pre-exponential factor is 1.545×1012.The formation process of calcium suphoaluminate（C4A3S） was investigated by the X-ray diffraction technique and then the thermodynamics was analyzed, finally the kinetics of which was studied by SC-132. XRD results show that the formation of C4A3S is accomplished in three different kinds of ways： one is by solid reaction of Ca （OH）2/ CaO, Al2O3 and CaSO4, other two ways are through such interstitial products as CaO·Al2O3 and CaO·2Al2O3. The formation thermodynamics shows that C4A3S begins to form at 900 ℃-1 000 ℃ and increases as temperature rising; the quantity of reaches the highest at 1 300 ℃-1 350 ℃ and then falls at 〉1350℃. Kinetics study shows that the formation rate of C4A3S can be described as first-order kinetics at high temperature, and it belongs to the random nucleation growth mechanism. The apparent activation energy is 456.37 kJ·mol-1 and pre-exponential factor is 1.545×1012.

关 键 词：thermal decomposition MECHANISM KINETICS calcium sulphoaluminate 

分 类 号：O611.3[理学—无机化学]