The primary lime formed by adding limestone( 20- 30 mm) has the characteristics of higher activity and larger interface area with slag,from the comparative analysis of melting slagging with addition of lime and limestone into BOF,which helps limestone to melt and slag. Limestone 's heat absorption capacity is large,being 4 times as high as lime and scrap. If addition amount of limestone is too large,smelting temperature will be greatly influenced and at the same time,reasonable addition amount of the other ...