The equilibrium between ferrosilicon and SiO2-Al2O3-CaO ternaryslag have been experimentally investigated using graphite crucible at 1 550 ℃. The Al and Ca contents in ferrosilicon were given in terms of isoconcentration curves in equilibrium with the ternary slag of SiO2-Al2O3-CaO. The present experimental work provides available data to analyze the behavior of Al and Ca during oxidation refining process for silicon alloy.
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