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US 4,954,167 AGranted
Dispersing gas into molten metal
OwnerPaul V. Cooperinventor
Life of this patent
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Abstract
Gas is dispersed into molten metal by immersing a shaft-supported impeller into the molten metal and by pumping gas through the shaft and out of the impeller. The impeller is in the form of a rectangular prism having sharp-edged corners that shear the gas into finely divided bubbles. The particular shape of the impeller provides an especially effective bubble-shearing and bubble-dispersing action.
Claims10
A method for dispersing gas into molten metal, comprising the steps of:
- providing an impeller in the form of a rectangular prism having upper and lower faces, a width (A), a depth (B), and a height (C), with (A) being equal to (B), the impeller having a gas discharge outlet opening through the lower face of the prism;
- providing an elongate, rotatable a shaft rigidly connected to the impeller and projecting from the upper face of the impeller;
- providing means for conveying gas to the gas discharge outlet;
- providing a vessel within which molten metal is contained;
- immersing the impeller into the molten metal contained within the vessel;
- rotating the shaft about its longitudinal axis;
- and
- pumping gas through the gas discharge outlet while rotating the shaft.
5 more elements
Dependencies are inferred from the claim text.