It is not necessary to use a reducing agent such as metallic Ca or facilities for electrolysis of molten salt and power as well as equipment for heating in an inert gas atmosphere or a vacuum atmosphere, and heating up to 1050 C. is sufficient And is suitable for the production of an Al-Sc based alloy capable of continuous operation. Metallic aluminum (Al) and a metal fluoride salt whose melting point is lower than the reaction temperature and whose density is within the range of 70 to 95% of the density of molten metallic aluminum at the reaction temperature, and a scandium compound are placed in a reaction vessel And heating the reaction system to a reaction temperature of 700 to 1050 C. to form a molten metal layer of the lower layer made of molten metallic aluminum and a molten salt layer of the upper layer in which the metal fluoride salt and the scandium compound are melted, Scandium ions (Sc3+) To the molten metal layer side to produce an Al-Sc based alloy.
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