LADLE FOR MOLTEN METAL AND METHOD FOR REFINING MOLTEN METAL

• Main Authors: TADAMA TOMOAKI, TAMURA NOZOMI, OGURA SHIGERU
• Format: Patent
• Language: English
• Published: 19.09.2000
• Edition: 7
• Subjects: CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; METALLURGY OF IRON; PERFORMING OPERATIONS; POWDER METALLURGY; PRETREATMENT OF RAW MATERIALS; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; PRODUCTION AND REFINING OF METALS; TRANSPORTING; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To obtain a ladle which can execute mechanical stirring of molten metal by forming the horizontal cross section at least near the statical bath surface height of stored molten metal to non-circular shape. SOLUTION: Relating to the ladle, preferably the non-circular shape is made to an elliptic shape having 0.75-0.95 in the range of the ratio of minor axis/major axis and the vicinity of the statical bath surface height is at least 200 mm in the vertical range of the statical bath surface, and the mechanical stirring means is provided in the inner part where the molten metal is contained. When the molten iron 5 is stirred with an impeller, the vertical stream (a) is generated and the larger the number of the rotation is, the stronger the stream (a) is, and the bath surface 10 is raised near the recessed side wall at the center part and becomes the max. near the side wall on the minor axis. However, since the space, in which the stream is run away by the difference between the minor axis side at the wall side on the major axis exists, the stream (a) is separated and the stream (b) is generated and the raising of the bath surface is lost in the stream (b) direction and reduced. In this way, the over-flow of molten metal from the ladle during refining is eliminated and the refining can stably and smoothly be executed to improve the refining effect.