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Method for making high purity and free flowing metal oxides powder

  • US 7,931,836 B2
  • Filed: 10/23/2006
  • Issued: 04/26/2011
  • Est. Priority Date: 10/21/2005
  • Status: Active Grant
First Claim
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1. A method of processing a metal oxide powder comprising the steps of:

  • injecting a powder feed material into a plasma stream;

    melting the powder feed material with said plasma stream to form molten droplets; and

    cooling said molten droplets under free-fall conditions so as to form frozen spherical droplets such that said molten droplets have ample time for complete in-flight solidification before reaching a collection chamber,wherein said frozen spherical droplets have higher density and purity levels than the powder feed material.

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