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摘自《日本公开特许公报》,平1—301814 通常,转炉出钢时带入钢包的炉渣含有高达10～20％的总氧化铁含量,如不采取适当措施就会将钢水中的Al氧化,致使钢中的Al_2O_3非金属夹杂含量增加。为了提高钢的纯洁度,川崎钢铁公司开发了一种新的精炼工艺,即在转炉出钢过程中,往钢包内加石灰,形成成分接近CaO∶Al_2O_3=1∶1的低熔点CaO-Al_2O_3系炉渣来改善炉渣的流动性,并进一步在出钢末期和(或)出钢以后往钢包内炉渣上方加铝促进氧化铁还原,为此,必须加入与铝同氧化铁反应产生的Al_2O_3量大致同等的石灰。同时通过浸入式吹
From Japanese Laid-Open Patent Publication No. Heisei 1-301814, it is common that the slag brought into the ladle during tapping of the converter contains up to 10 to 20% of the total iron oxide content and Al can be oxidized in the molten steel without proper measures The content of Al 2 O 3 nonmetallic inclusions in steel increases. In order to improve the purity of steel, Kawasaki Iron and Steel Company has developed a new refining process, that is, in the process of tapping the converter, adding lime to the ladle to form a low melting point CaO-Al 2 O 3 system with a composition close to CaO: Al 2 O 3 = 1: 1 Slag to improve the fluidity of the slag and further adding aluminum to the slag inside the ladle to promote the reduction of iron oxide further at the end of tapping and / or tapping. Therefore, it is necessary to add approximately the same amount of Al 2 O 3 produced by reaction with aluminum and iron oxide Lime. At the same time by immersion blow