Floating Critical Diameter and Removal Ratio of Al2O3 Particles in Interface Between Steel and Slag
GUO Luo-fang,LI Hong,WANG Yao,LI Yong-qing
(School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China)
Abstract:The kinetic characteristics and removal rate of Al2O3 particles in the inclusion removing layer, which was close to the interface between steel and slag, were investigated by theoretical calculation and analysis. The results show that: the Brownian diffusion floating critical diameter (BDFCD) of Al2O3 inclusion particle is 1.33μm, and the inclusion particle whose diameter is less than BDFCD is very difficult to be removed by floating; the Brownian collision dominant region is the area in which inclusion particles with diameter less than 2.5μm collide with each other and the inclusion particles with diameter of 2.5-5μm collide with small ones with diameter less than 0.5μm; the inclusion particles with diameter of 20-150μm can easily be completely removed by floating in the inclusion removal layer, but the removal rate of inclusion particles with diameter less than 10μm is very small and rise slowly, so these small inclusion particles are the main control objects to improve steel cleanliness.
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GUO Luo-fang,LI Hong,WANG Yao,LI Yong-qing. Floating Critical Diameter and Removal Ratio of Al2O3 Particles in Interface Between Steel and Slag. Iron and Steel, 2012, 47(4): 23-27.
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