The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 1984
Filed:
Feb. 18, 1983
Bertil G Tivelius, Viken, SE;
Scandinavian Lancers Aktiebolag, Hoganas, SE;
Abstract
Apparatus for treating molten metal comprising a ladle for containing a molten metal to be treated having an upper edge, a hood arranged above the ladle and comprising a heat shield essentially covering completely the ladle and having a ceramic lining facing the molten metal in the ladle, with the heat shield and the upper edge of the ladle being spaced from each to define a gap between the heat shield and the upper edge of the ladle. A screen forms and all-enveloping roof over the heat shield and extends over and below the gap to define a circumferential opening between the screen and the ladle below the gap, and spacing means extending between the screen and the heat shield are provided for maintaining the screen and the heat shield spaced apart with respect to each other to define a chamber between the screen and heat shield. The gap communicates with the chamber for the passage of gases therethrough from the ladle to the chamber, and the circumferential opening defines an inlet opening for ambient air to the chamber. At least one lance means is provided for introducing at least one gas in the molten metal in the ladle and/or to a ladle area above the molten metal, and at least one exhaust means communicating with the chamber is provided for exhausting gases which pass from the ladle area above the molten metal into the chamber through the gap, and also for exhausting air which is sucked from the ambient atmosphere into the chamber mainly through the circumferential opening. At least one aperture means is provided in the hood for lowering at least one of the lance means into the ladle.