Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1989-06-07
1990-06-05
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75708, 266212, 266225, 266235, C22B 2106, F27D 2304
Patent
active
049310917
ABSTRACT:
An apparatus and process are described for treating molten metal. The invention comprises: (a) a heated vessel having inlet and outlet means for the continuous flow of molten metal downwardly through the vessel, (b) a perforated plate extending horizontally across the vessel dividing it into an upper treatment section and a lower treatment section, this plate forming an intermediate treatment section, and (c) a device for injecting gas in the form of small discrete bubbles into the metal in the lower treatment section, this device comprising a hollow rotatable shaft extending downwardly through an opening in the plate with drive means coupled to the upper end of the shaft, a vaned rotor fixedly attached to the lower end of the shaft within the lower treatment section, with one or more passageways within the rotor for conducting gas from the interior of the shaft to the metal in the lower treatment section. When the gas is discharged through the rotor and the rotor is rotated, the gas is injected into the metal in the form of small discrete bubbles which are uniformly dispersed within the lower treatment section. In a preferred embodiment of the invention the gas bubbles move from the rotor upwardly and outwardly in a generally conical pattern to be distributed across the bottom of the perforated plate and pass upwardly through the perforations thereof.
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patent: 4634105 (1987-01-01), Withers et al.
Dube Ghyslain
Waite Peter D.
Alcan International Limited
Andrews Melvyn J.
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