INTERMEDIATE VESSEL FOR SEPARATING NON-METALLIC INCLUSION AND METHOD FOR SEPARATING NON-METALLIC INCLUSION

摘要

PROBLEM TO BE SOLVED: To provide an intermediate vessel for separating non-metallic inclusion which can efficiently and economically separate the non-metallic inclusion in molten metal, and a method for separating the non-metallic inclusion. ;SOLUTION: At the time of blowing while giving the rotation in the horizontal direction to the molten metal, gas blowing parts 3 having slender blowing surfaces 3a and 3b formed on the inner surface 1a, are arranged on the side surface and/or the bottom surface of the vessel. The gas blowing part is suitable to be a slit-like nozzle or a slender porous refractory. Further, the relation among the dimensional ratio (n) in the blowing surface, the gas blowing quantity Q and the rotating flow velocity V of the molten metal, is set so as to satisfy (Q/V)/n ≤3.7×10^-4 to execute the separation of the non-metallic inclusion in the molten metal. In the gas blowing part, plural tubular nozzles may be used. In such a case, the relation among the distance L between mutually nozzles, the gas blowing quantity Q and the rotating flow speed V of the molten metal, may be set so as to satisfy Q/(L.V)≤1.7×10^-2.;COPYRIGHT: (C)1999,JPO