Concept of inclusion capacity of slag and its application
ZHANG Li-feng1, REN Ying2
1. School of Mechanical and Materials Engineering, North China University of Technology, Beijing 100144, China; 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract:The parameter of the difference between the original concentration and the saturation concentration of inclusions in the refining slag divided by slag viscosity (ΔC/η) was retrieved from literatures and the disadvantages of the parameter were discussed, including its dimensional feature and the ignorance of the size of inclusions. Similar to the dimensionless Grash of number used to the natural convection of the fluid flow, the inclusion capacity of the refining slag was proposed (the dimensionless number of Zh). The dimensionless dissolution rate of inclusions in the slag (Ry) was proposed. The expression between the inclusion capacity of the slag and the dimensionless dissolution rate was obtained. The inclusion capacity of the slag, the Zh number, can be used to predict the dissolution rate and dissolution time of inclusions in the refining slag, to calculate the rate constant of the dissolution reaction and the diffusion coefficient of inclusions in the slag, and to calculate the removal time of inclusions from the molten steel. With the increasing of the Zh number and the increasing of inclusion size, the dissolution time of inclusions became longer. With the increasing of inclusion size, the average removal time of less than 500 μm inclusions increased while the maximum removal time decreased. At the temperature of 1 600 ℃, for the dissolution of Al2O3 in the CaO-Al2O3-SiO2 slag, the dissolution reaction rate constant was 5×10-6-10×10-6 m/s and the diffusion coefficient of Al2O3 in the CaO-Al2O3-SiO2 slag was 2.5×10-10-4×10-10 m2/s, and the two parameters varied with the composition of the slag.
张立峰, 任英. 精炼渣的夹杂物容量的概念及其应用[J]. 钢铁, 2023, 58(2): 47-60.
ZHANG Li-feng, REN Ying. Concept of inclusion capacity of slag and its application[J]. Iron and Steel, 2023, 58(2): 47-60.
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