Numerical investigation of basic oxygen furnace slag modification with gas bottom-blowing and SiO2 modifier
Tóm tắt
To avoid the volume expansion of basic oxygen furnace (BOF) slag for use in building materials, a hot slag modification process was proposed to reduce free CaO (f-CaO) in the molten slag. A transient 3D numerical model of BOF molten slag modification by SiO2 particles was established. The flow and heat transfer of molten slag, movement and dissolution of the modifier, and concentration distribution of f-CaO in slag during the modification of BOF were studied. The distribution of f-CaO concentration is inhomogeneous all over the molten slag. The mixing effect at the slag surface is weaker than that at the half-height plane of the slag. To consume the f-CaO below 2.0 wt.% in the slag, the optimum quantity of the SiO2 modifier is 10.0% of the mass of the slag. The fine SiO2 particles help attain a lower final mass fraction of f-CaO and a higher SiO2 utilization ratio.
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