In-situ confocal microscopy study on dissolution kinetics of calcium aluminate inclusions in CaO-Al_(2)O_(3)-SiO_(2)type steelmaking slags  

作　　者：Guang Wang Muhammad Nabeel Wangzhong Mu A.B.Phillion Neslihan Dogan 

机构地区：[1]Department of Materials Science and Engineering,McMaster University,Hamilton,L8S4L7,Ontario,Canada [2]Department of Materials Science and Engineering,KTH Royal Institute of Technology,Stockholm,10044,Sweden [3]Engineering Materials,Department of Engineering Science and Mathematics,LuleåUniversity of Technology,Luleå,97187,Sweden [4]Department of Materials Science and Engineering,Delft University of Technology,Delft,2628CD,The Netherlands

出　　处：《Journal of Iron and Steel Research International》2025年第2期364-375,共12页钢铁研究学报(英文版)

基　　金：the Natural Sciences and Engineering Research Council of Canada(NSERC)for funding this research;This research used a high temperature confocal laser scanning microscope-VL2000DX-SVF17SP funded by Canada Foundation for Innovation John Evans Leaders Fund(CFI JELF,Project Number:32826),a PANalytical X’Pert diffraction instrument located at the Centre for crystal growth,Brockhouse Institute for Materials Research,and a scanning electron microscope-JEOL 6610 located at the Canadian Centre for Electron Microscopy at McMaster University.W.Mu would like to acknowledge Swedish Iron and Steel Research Office(Jernkonteret),STINT and SSF for supporting the time for international collaboration research regarding clean steel.

摘　　要：Dissolution kinetics of CaO·2Al_(2)O_(3)(CA_(2))particles in a synthetic CaO-Al_(2)O_(3)-SiO_(2)steelmaking slag system have been investigated using the high-temperature confocal laser scanning microscope.Effects of temperature(i.e.,1500,1550,and 1600℃)and slag composition on the dissolution time of CA_(2)particles are investigated,along with the time dependency of the projection area of the particle during the dissolution process.It is found that the dissolution rate was enhanced by either an increase in temperature or a decrease in slag viscosity.Moreover,a higher ratio of CaO/Al_(2)O_(3)(C/A)leads to an increased dissolution rate of CA_(2)particle at 1600℃.Thermodynamic calculations suggested the dissolution product,i.e.,melilite,formed on the surface of the CA_(2)particle during dissolution in slag with a C/A ratio of 3.8 at 1550℃.Scanning electron microscopy equipped with energy dispersive X-ray spectrometry analysis of as-quenched samples confirmed the dissolution path of CA_(2)particles in slags with C/A ratios of 1.8 and 3.8 as well as the melilite formed on the surface of CA_(2)particle.The formation of this layer during the dissolution process was identified as a hindrance,impeding the dissolution of CA_(2)particle.A valuable reference for designing or/and choosing the composition of top slag for clean steel production is provided,especially using calcium treatment during the secondary refining process.

关 键 词：In-situ observation Dissolution kinetics Confocal laser scanning microscope Calcium aluminate inclusion Steelmaking slag Clean steel 

分 类 号：TF7[冶金工程—钢铁冶金]