METHOD FOR REFINING MOLTEN METAL

PROBLEM TO BE SOLVED: To provide a refining method of molten metal, by which the suitable slag component enabling the prevention to the reoxidation of molten metal can be obtd. and the hitting ratio of the molten metal component can be raised. SOLUTION: When the molten metal is refined by adding reducing agent in a molten metal holding vessel, a jig for taking slag analyzing sample of a hollow body constituted with a member having at least one smooth and flat surface and slag quick cooling function, is dipped into the slag in the molten metal holding vessel and immediately pulled up at one or more times to take the sample for slag analysis. The quick analysis is executed and the adding quantity of reducing agent is adjusted so that the components in the slag and/or the molten metal become the target composition. The hollow body is a hollow square columnar body 1 and it is desirable to be constituted with a metal plate having >=3 mm thickness.