F - Mech Eng,Light,Heat,Weapons – 27 – D
Patent
F - Mech Eng,Light,Heat,Weapons
27
D
39/108, 53/355
F27D 27/00 (2010.01) C22B 9/00 (2006.01) C22B 19/32 (2006.01) F27D 3/15 (2006.01)
Patent
CA 1303361
METHOD AND APPARATUS FOR MELTING METALS ABSTRACT In the melting of metals in a furnace with the formation of dross on top of molten metal, the bridging and clogging of equipment with dross is overcome by using an impellor surrounded by a partly immersed, generally cylindrical, slotted shroud. The impellor is rotated and metal feedstock is added in the form of particulates to the resulting vortex. The particulates move downward into the vortex and melt readily. Dross separates from the melt and collects in a crusty layer on the melt surface outside the shroud. At least one vertically-positioned elongated opening in the wall of the shroud is adapted to allow melt to circulate through the opening while preventing dross collected outside the shroud from passing through. The shroud may have a downward taper with an angle of from greater than about 0° to about 30°. The elongated openings may have a variety of shapes, but are preferably rectangular. The shroud and impellor are suspended from above the furnace and are preferably made of a ceramic material.
533239
Mawer Eric L.
Willans Robert D.h.
Gowling Lafleur Henderson Llp
Teck Cominco Metals Ltd.
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