炼钢过程少渣操作,要求对铁水进行预脱磷和硫,相应地要求把铁水含硅量降低至0.1%左右。日本川崎公司为了开发高炉低硅铁水冶炼新工艺,提出了从风口喷吹粉料抑制硅向铁水迁移反应的发生,因而使铁水含硅量降低,并在千叶厂2号高炉(1380米~(?),20个风口)进行了从风口喷吹粉料的试验。喷吹用粉料是CaCO_3(平均粒度0.012毫米,TFe0.02%,SiO_20.2%,S0.02%,Al_2O_30.03%,CaO55.6%,P0.002%)和氧化铁(平均粒度0.044毫米,TFe68.50%,SiO_20.46%,S0.002%,Al_2O_30.44%, Slag-free operation of the steelmaking process requires pre-dephosphorization and sulfurization of the hot metal, which accordingly reduces the silicon content of the hot metal to about 0.1%. In order to develop a new process for smelting low-silicon molten iron in blast furnace, Kawasaki Co., Ltd. proposed to suppress the migration of silicon to molten iron from the tuyere to reduce the amount of silicon in the molten iron. In the blast furnace No.2 blast furnace (1380m ~ (?), 20 tuyeres) were tested for blowing powder from the tuyere. The blowing powder was CaCO_3 (average particle size 0.012 mm, TFe 0.02%, SiO 2 20.0%, S 0.02%, Al 2 O 30.03%, CaO 55.6%, P 0.002%) and iron oxide Mm, TFe68.50%, SiO_20.46%, S0.002%, Al_2O_3.44%