| 摘要 |
PURPOSE:To decrease the concn. of Si in molten iron while maintaining stable operations by blowing composite compds. or mixtures of iron oxides and CaO sources or MgO sources through the tuyeres of a blast furnace into the blast furnace and controlling the concn. of Si in the metal dropping in the furnace to a low level. CONSTITUTION:Composite compds. of iron oxides and CaO sources or MgO sources, for example, self-fluxing sinter, self-fluxing pellets or mixtures of iron oxides and CaO sources or MgO sources, for example, converter slag, electric furnace slag, dolomite, are ground to <=10mm. grain sizes and are blown into a blast furnace through its tuyeres or near the same. The rate of blowing is about 0.2wt% basing on the weight of dropping molten iron. By such blowing, the suppression of siliconization and the desiliconization reaction of the dropping molten iron are accelerated and the concn. of Si in the molten iron is reduced. |
