In situ observation of the dissolution kinetics of Al_(2)O_(3) particles in CaO–Al_(2)O_(3)–SiO_(2) slags using laser confocal scanning microscopy  

作　　者：Changyu Ren Caide Huang Lifeng Zhang Ying Ren 

机构地区：[1]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China [3]Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063200,China [4]School of Mechanical and Materials Engineering,North China University of Technology,Beijing 100144,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2023年第2期345-353,共9页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Nature Science Foundation of China(Nos.U1860206,51725402);the Science and Technology Program of Hebei,China(Nos.20311006D,20591001D)。

摘　　要：The dissolution kinetics of Al_(2)O_(3) in CaO-Al_(2)O_(3) SiOslags was studied using a high-temperature confocal scanning laser microscope at 1773 to 1873 K.The results show that the controlling step during the Al_(2)O_(3) dissolution was the diffusionin molten slag.It was found that the dissolution curves of Al_(2)O_(3) particles were hardly agreed with the traditional boundary layer diffusion model with the increase of the CaO/Al_(2)O_(3) ratio of slag.A modified diffusion equation considering slag viscosity was developed to study the dissolution mechanism of Al_(2)O_(3) in slag.Diffusion coefficients of Al_(2)O_(3) in slag were calculated as 2.8×10to 4.1×10m~2/s at the temperature of 1773-1873 K.The dissolution rate of Al_(2)O_(3) increased with higher temperature,CaO/Al_(2)O_(3),and particle size.A new model was shown to be v_(Al_(2)O_(3))=0.16×r_(0)^(1.58)×x^(3.52)×(T-T_(mp))^(1.11)to predict the dissolution rate and the total dissolution time of Al_(2)O_(3) inclusions with various sizes,where vAl_(2)O_(3) is the dissolution rate of Al_(2)O_(3) in volume,μm^(3)/s;x is the value of CaO/Al_(2)O_(3) mass ratio;R_(0) is the initial radius of Al_(2)O_(3),μm;T is the temperature,K;T_(mp) is the melting point of slag,K.

关 键 词：INCLUSION dissolution kinetics confocal scanning laser microscope refining slag 

分 类 号：TF534[冶金工程—钢铁冶金]