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Adsorption of oxide impurities in steel by liquid phase formed in refractories and its influence on the steel total oxygen content
By Yaowu Wei and Nan Li
Deoxidation products, adsorption by refractory lining, total oxygen content, liquid phase
Effects of calcium-aluminate cement bonded MgO based refractories on the total oxygen content of steel were investigated by oxygen determinator, scanning electron microscopy (SEM), energy disperse spectroscopy (EDS), X-ray diffraction (XRD) and chemical analysis. The result shows that the adsorption of the deoxidation product in molten metal by refractories had notable influence on the total oxygen content of steel. When the mass content of calcium-aluminate cement in refractory was below 6 %, with the increment of calcium-aluminate cement content, the quantity of spinel formed in refractories increased and densified the refractory. This fact prevented the steel from penetration into refractories; so the contact area between refractories and steel was small, so that the impurity adsorption by refractory liquid decreased and the total oxygen content of steel was increased.
When the mass content of calcium-aluminate cement reached 9 %, the melting point of eutectics in studied system decreased and the quantity of liquid increased quickly. That might act as the route of the molten metal entry in refractories, which would increase the contact area between refractories and steel; thus the absorption of Al2O3 and SiO2 in steel by refractory liquid enhanced, so that the total oxygen content of steel decreased.
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