Agglomeration of Solid Inclusions in Molten Steel
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Agglomeration of alumina inclusions in the molten steel is investigated through the free energy analysis of the cavitation between inclusions. The mechanism of agglomeration, the activation state, the stable state, the equilibrium state, and the critical separation for the cavitation are discussed. The equilibrium energy is proportional to the square of the inclusion radius, EEq = 0.710R P 2 , while the critical separation is directly proportional to the inclusion radius, dC = 0.146RP. Agglomerates of micron inclusions are hardly broken up by the turbulence in steelmaking practice.
The authors are grateful for the support from the National Key R&D Program of China (2017YFB0304000 and 2017YFB0304001), the National Science Foundation of China (Grant No. 51725402), the Beijing Key Laboratory of Green Recycling and Extraction of Metals (GREM), and the High Quality Steel Consortium (HQSC) and Green Process Metallurgy and Modeling (GPM2), School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing (USTB).
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