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High efficiency system for melting molten aluminum

  • US 5,963,580 A
  • Filed: 12/22/1997
  • Issued: 10/05/1999
  • Est. Priority Date: 12/22/1997
  • Status: Expired due to Fees
First Claim
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1. A method of heating a body of molten aluminum contained in a heating bay, comprising the steps of:

  • (a) providing a body of molten aluminum;

    (b) projecting an electric powered heater into said body of molten aluminum, said heater comprised of;

    (i) a sleeve suitable for immersing in said molten aluminum, the sleeve comprised of a metal or a composite material comprised of an inner layer of metal having a coefficient of thermal expansion of less than 10×

    10-6 in/in/°

    F. and having an outside surface having a refractory coating thereon exposed to said molten aluminum, said refractory coating resistant to attack by said molten aluminum and having a coefficient of thermal expansion of less than 10×

    10-6 in/in/°

    F.; and

    (ii) an electric heating element located in said sleeve in heat transfer relationship therewith for adding heat to said molten aluminum, said heater operated at a watt density in the range of 25 to 350 watts/in2 ; and

    (c) passing electric current through said element and adding heat to said body of molten aluminum.

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