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The main difficulty in smelting this alloy is the rise in the furnace bottom. The main reason is that after the carbide is formed in the furnace, the resistivity decreases, which causes the electrode to rise, thereby causing the furnace bottom temperature to be insufficient and forming a false furnace bottom. In addition, because the difference between the specific gravity of the slag formed by the alloy and the smelting process is small, it is likely that the slag and iron cannot be separated sufficiently during the smelting process. The higher the silicon and aluminum content in the iron alloy, the more obvious this situation is. Practice has shown that when smelting high-aluminum alloys with bauxite ingredients, the sintering of the furnace charge is difficult, which can easily cause the collapse of the material and make the smelting difficult. This is contrary to the characteristics of easy sintering of silica when ferrosilicon is smelted.
