COOLING METHOD OF LANCE FOR STIRRING MOLTEN METAL

PURPOSE:To extend the service life of a lance for stirring a molten metal used for stirring and refining of the molten metal and to reduce the cost ratio thereof by running water into a metallic pipe provided at the center of the lance after the treatment thereby cooling the lance. CONSTITUTION:A la...

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Bibliographische Detailangaben
Hauptverfasser: TAKAHASHI TATSUTO, KATOU KAZUYOSHI, KOBAYASHI MOTONOBU, MATSUDA YASUHIRO, SHIRATANI YUUSUKE, KOMATSU YOSHIMI, KITAMURA MINORU, USUI TSUTOMU
Format: Patent
Sprache:eng
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Zusammenfassung:PURPOSE:To extend the service life of a lance for stirring a molten metal used for stirring and refining of the molten metal and to reduce the cost ratio thereof by running water into a metallic pipe provided at the center of the lance after the treatment thereby cooling the lance. CONSTITUTION:A lance 3 for stirring a molten normal formed by covering a metallic pipe 7 having a gas passage hole 7' with refractories 8 is immersed in the molten iron 4 and slag 4 in a ladle 1, and gas and flux are blown to generate gas bubbling 6, whereby the molten iron 4 is stirred and refined. Said lance is removed from the ladle 1 after the treatment and water is run in the pipe 7 to cool the lance, by which the difference in thermal expansion between the pipe 7 and the refractories 8 is decreased and the generation of the crack and stripping in the refractories 8 and the bend, etc. of the pipe 7 is prevented. It is preferable to prevent the decrease in the life owing to wetting of the refractories 8 by attaching a water recovering device consisting of a pipeline 10 with a suction cup to the hole 7' in the lower part of the pipe 7 and recovering thoroughly the cooling water fed into the pipe 7 from the upper part thereof.