Crystallization behavior of blast-furnace slag by single hot thermocouple technique  

作　　者：Tie-lei Tian Shuang Cai Yu-zhu Zhang Hong-wei Xing 

机构地区：[1]College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063009,Hebei,China [2]College of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China

出　　处：《Journal of Iron and Steel Research International》2020年第3期259-265,共7页

基　　金：This work was financially supported by the National Natural Science Foundation of China(Grant No.51474090).

摘　　要：The crystallization behavior of blast-furnace slag under isothermal and continuous-cooling conditions was studied using the single hot thermocouple technique.The crystallization phases were obtained using FactSage software and X-ray diffractometry.The crystallization kinetic parameters were calculated by combining these results with the Johnson-Mehl—Avrami model.Under isothermal conditions,the shortest crystallization incubation time was 24 and 18 s when the temperatures were 1300 and 1150℃,and the corresponding critical cooling rates were 4.5 and 14.3℃/s,respectively.At 1270℃,the slag was difficult to crystallize and the fiber-forming rate improved.When the continuous-cooling rate was 6.5℃/s,the slag solidified into a glassy state.The main crystallization phases,gehlenite,akermanite,anorthite,and melangite,were most easily precipitated.The growth factors of melangite and anorthite were approximately 1.63 and 1.68,respectively,which indicated that the crystals nucleated on the surface and grew in two dimensions.

关 键 词：BLAST-FURNACE SLAG COOLING rate CRYSTALLIZATION Single HOT THERMOCOUPLE technique 

分 类 号：TF534.1[冶金工程—钢铁冶金]