Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1994-10-03
1995-10-31
Andrews, Melvyn
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75680, 75684, 75708, C22B 905, C22B 2106
Patent
active
054625807
ABSTRACT:
Disclosed is an improved method for dispersing a treatment media in a body of molten metal using an impeller, nozzles, and other mixing means to disperse the media in the body of molten metal, the method producing increased shear forces in the body of molten metal and preferably reducing vortex formation. In one embodiment, the method comprises the steps of providing a body of molten metal and an impeller on a shaft in the body. A treatment media is added to the body and dispersed by rotating said impeller in one direction and thereafter reversing the direction of rotation of the impeller to a counter direction. The direction of rotation of the impeller is reversed periodically to substantially reduce formation of a vortex around the shaft of the impeller and to provide increased shear forces in the body for purposes of improving treatment of the molten metal by improved dispersion of the media therein. Further, the reversal of direction of the impeller increases the radial velocity gradient of the molten metal thereby increasing shear forces. This creates numerous subsurface streams which has the effect of dispersing small gas bubbles throughout the melt. This substantially improves dispersion of fluxing material throughout the melt.
REFERENCES:
patent: 3982913 (1976-09-01), Feichtinger
patent: 4784374 (1988-11-01), Pelton
patent: 5160693 (1992-11-01), Eckert et al.
patent: 5364450 (1994-11-01), Eckert
Alexander Andrew
Andrews Melvyn
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