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我厂4号高炉(300m~3)主要生产炼钢生铁,原料S负荷较高,一般为7～9kg/t,且含S波动大,占含铁原料80%以上的烧结矿含S波动在0.05～0.38%之间。这对产品合格率威胁很大。为了获得含S合格的产品,操作中经常根据S负荷的变化,调整炉温和碱度。这样,一方面人为地造成了热制度和造渣制度的波动,不剩于稳定炉况和降低急比。另方面提高碱度也是有限度的,从CaO—SiO_2—Al_2O_3—MgO四元系等熔图上看,我厂炉渣在CaO/SiO_2接近或大于1.3时,等熔化温度线异常密集,在炉温波动较大时,容易引起
The blast furnace steel (300m ~ 3) of No.4 blast furnace in our factory mainly produces steelmaking pig iron. The S load of raw materials is high, generally 7 ~ 9kg / t, and the fluctuation of sinter containing S, 0.05 ~ 0.38% between. This is a great threat to the passing rate of the product. In order to obtain S qualified products, the operation is often based on S load changes, adjust the furnace temperature and alkalinity. In this way, on the one hand, artificially caused fluctuations in the thermal regime and the slagging regime, leaving the steady state of the furnace and the reduction of the urgency ratio. On the other hand, there is a limit to increase the alkalinity. From the melting diagram of CaO-SiO_2-Al_2O_3-MgO quaternary system, when the CaO / SiO_2 is close to or greater than 1.3, the melting temperature line is abnormally dense. Fluctuations, easy to cause