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Method for treating molten metal with a rotary device

  • US 4,908,060 A
  • Filed: 06/13/1989
  • Issued: 03/13/1990
  • Est. Priority Date: 02/24/1988
  • Status: Expired due to Term
First Claim
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1. A method of treating molten metal using a rotary device comprising a hollow shaft with a gas discharge end and a hollow rotor attached to the shaft, the rotor having a plurality of vanes extending from the shaft towards the periphery of the rotor and dividing the rotor into a plurality of compartments, each compartment having an inlet adjacent the shaft and an outlet adjacent the periphery of the rotor, and the rotor having means for passing gas from the discharge end of the shaft into the compartments, wherein the discharge end of the shaft opens into a manifold in the rotor, open at one end thereof, and the inlets for the compartments are present in the wall of the manifold of the rotor, the method comprising the steps of:

  • dispersing a gas in molten metal contained in a vessel by;

    (a) rotating the rotary device so that the molten metal enters the manifold through the open end thereof, and (b) by supplying gas to the shaft so that the gas passes from the hollow interior of the shaft to the manifold, whereby a dispersion of gas in molten metal flows into the compartments through the inlets and out through the outlets.

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