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Device for the manufacture of spherical metallic powder

  • US 4,177,026 A
  • Filed: 09/26/1977
  • Issued: 12/04/1979
  • Est. Priority Date: 10/01/1976
  • Status: Expired due to Term
First Claim
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1. In a device for the manufacture of a metallic powder by atomizing liquid metal, the device comprising a vertical cylindro-conical vessel having cooled walls comprising:

  • in its upper part, means for introducing a stream of liquid metal into said vessel, means for atomizing the stream of metal using jets of gas under pressure, andat least one gas outlet for gas charged with fine particles of the metal,in its lower part, a funnel for receiving and discharging the powder,in its lower half, gas inlet means for providing one or more jets of gas tangentially to a common cylinder centered on the axis of said vessel and forming an angle of between 0° and

    60°

    with a horizontal plane, for generating vortices of gas charged with fine particles of the metal along an ascending spiral centered on the axis of said vessel so as to multiply the impacts between the fine particles of the powder and the cooled walls of said vessel and thus to increase the heat exchanges between the matter located in said vessel, consisting of the gas and the falling powder, and the cooled walls of said vessel,a cyclone dust remover having cooled walls and connected between said gas outlet means and having a fan operable to cause circulation of gas between said gas outlet and said gas inlet means located in the lower half of said vesselthe improvement consisting of a duct joining the funnel of said cyclone dust remover to said vessel in the immediate vicinity of said gas inlet means, said duct allowing the fine particles of the powder recovered by said dust remover to be reintroduced into said vessel.

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