VISCOUS SLAG OPERATION FOR STEEL-MAKING IN OXYGEN SIDE-BLOWN CONVERTERS
Yin Rui-yu Wu Shi-lin Liu Ren-gang (Research Institute of Tangshan Iron and Steel Company)
Cite this article:
Yin Rui-yu Wu Shi-lin Liu Ren-gang (Research Institute of Tangshan Iron and Steel Company). VISCOUS SLAG OPERATION FOR STEEL-MAKING IN OXYGEN SIDE-BLOWN CONVERTERS. Acta Metall Sin, 1978, 14(1): 1-16.
Abstract The very vigorous agitation at the interface on molten metal and slag in oxygen side-blown steel-making converters is a special feature which promotes the application of viscous slag operation.An investigation of end-point blow slags in the above-said converter has shown that many different types of viscous slags were corroded a little to the tarred dolomite lining bricks, and in certain cases the fused slags appear to stick and to creep upwards along the brick-lining forming a protection against erosion during operation. Thus, the application of viscous slag operation would appear to be prolonging the life of converter lining in steel-making.The nature of converter atmosphere at the time interval between the blowing periods and its interaction with slag have been investigated, as certain atmospheres are capable of reducing FeO in slag on thermodynamical considerations.In such case, it has been observed that when the total FeO of mean end-point blow slags was less than 12％, such slags in their usually fused condition to stick and to creep upwards along lining bricks. The slags crept upwards were chiefly composed of 3CaO·SiO_2 and 2CaO·SiO_2, with rather low 2CaO·Fe_2O_3 and other ferrous minerals content. It would appear that the "∑FeO" in the original endpoint blow slag of higher melting-temperature in its course of creeping upwards were progressively reduced by the converter atmosphere with the result of forming solid phases of higher melting-temperature such as 3CaO·SiO_2 and 2CaO·SiO_2.
