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AssigneeNippon Kokan Kabushiki Kaisha
InventorsYoshiharu Miyawaki, Masayuki Hanmyo, Yusuke Shiratani, Teruyuki Hasegawa, Yoichi Nimura, Noriyuki Hiraga
Estimating the term…
The object is to introduce a bottom-blown gas into a molten metal refining furnace so as to minimize the rate of blowing gas flow and increase the control range of the rate of blowing gas flow. There are included a refractory (1) having a plurality of holes (2) having an inner diameter of from 0.5 to 3.0 mm.phi. formed through said refractory and extending its working surface to its back, a metal cover (3) enclosing at least a part of the sides of the refractory (1) and a pressure box (4) formed in the bottom of the refractory (1) so as to communicate with the holes (2) and define a gas reservoir space. The molten metal is prevented from entering the holes (2) when the blowing gas pressure and the rate of blowing gas flow are decreased.
A bottom-blown gas blowing nozzle for a molten metal refining furnace, comprising a refractory including a plurality of holes having an inner diameter of from 0.5 to 3.0 mm.phi. formed through said refractory and extending from a working surface to a back thereof, a metal cover enclosing at least a part of sides of said refractory, and a pressure box formed in a bottom portion of said refractory so as to communicate with said holes and define a gas reservoir space.
Dependencies are inferred from the claim text.