METHOD FOR DISSOLVING METALLIC SILICON

PROBLEM TO BE SOLVED: To efficiently dissolve metallic silicon in molten aluminum, etc., by adding metallic silicon of specific grain size, washed with mineral acid, and a chloride-containing flux at the time of adding silicon to a molten metal such as aluminum. SOLUTION: At the time of, for example, adding silicon to a molten metal of aluminum ground metal of about 99.7% purity, metallic silicon of 2-30mm grain size, washed with hydrochloric acid, is added to the molten metal together with a flux containing at least one chloride (e.g. 50% NaCl, 50% KCl). By this method, metallic silicon can be efficiently dissolved in the molten aluminum and flowability can be improved, and an aluminum-base silicon alloy capable of thin-wall casting can be obtained.