Low porosity-high density refractory plug with constant flow

Details Low porosity-high density refractory plug with constant flow Low porosity-high density refractory plug with constant flow

F - Mech Eng,Light,Heat,Weapons

27

D

F27D 3/16 (2006.01) B28B 1/14 (2006.01) C04B 28/00 (2006.01) C04B 35/10 (2006.01) C21C 5/46 (2006.01)

Patent

CA 2043767

ABSTRACT OF THE DISCLOSURE Apparatus including a nozzle or refractory pipe lance for the secondary refinement of a bath of molten metal by the injection of a gas under pressure having one or more low porosity-high density refractory plugs which contain apertures of constant diameter. For the manufacture of a pipe lance, the low porosity-high density refractory plugs are attached to a central tube and the integral structure coated with a wire reinforced lower grade refractory material by vibratory casting. The low porosity-high density of the refractory plugs provides a corrosion resistance to the change of the diameter of the gas nozzles and therefore produces a controlled high velocity gas stream. Generating small bubbles and maintaining the gas velocity at a high constant rate reduces erosion of the refractory material around the tip of the apparatus and extends the lifetime of the pipe lance or nozzle. As progressive refractory wear proceeds during the useful life of the pipe lance, the gas flow rate will remain constant within a closed system.

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