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转炉冶炼低碳钢低磷钢时,终渣氧化性强,渣中w(T.Fe)高达20%~30%,影响到溅渣护炉效果和转炉炉龄。在溅渣开始时采用改渣剂对高氧化性炉渣进行改质,可以降低炉渣中的T.Fe含量,提高炉渣MgO含量,增加炉渣的熔化温度和黏度,溅渣时起渣的孕育时间小于1 min,炉渣中氧化铁与MgO-C炉衬中的碳反应受到抑制,防止溅渣层与炉衬之间气隙的产生,提高溅渣层的抗侵蚀能力,改善溅渣层与炉衬的粘结效果。对冶炼低碳钢低磷钢转炉溅渣护炉工艺的改进,显著提高了转炉的炉龄,吨钢补炉耐火材料消耗下降39%以上。
Converter smelting low-phosphorus steel, low-phosphorus steel, the final oxidation of strong slag, slag w (T.Fe) up to 20% to 30%, affecting the slag splashing effect and converter furnace age. In the beginning of splashing, the slag-modifying agent is used to modify the high-oxidation slag to reduce the content of T.Fe in the slag, increase the content of MgO in the slag, increase the melting temperature and viscosity of the slag, and the incubation time when the slag is splashed is less than 1 min, the reaction between iron oxide in the slag and carbon in the lining of MgO-C is inhibited to prevent the air gap between the slag splashing layer and the lining, improve the anti-erosion ability of the slag splashing layer and improve the adhesion of the slag splashing layer and the lining effect. The improvement of slag splashing protection technology for the smelting low phosphorus steel converter of low phosphorus steel significantly improved the furnace age of the converter, and the consumption of refractories per ton of steel increased by more than 39%.