Dispersing gas into molten metal
DCFirst Claim
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1. 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.
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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.
132 Citations
10 Claims
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1. A method for dispersing gas into molten metal, comprising the steps of:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification