Patents by Inventor Steven P. Matthew

Steven P. Matthew has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for the treatment of dusts and concentrates
    Patent number: 5256186
    Abstract: A method for the treatment of a mixture of lead dusts and pyritic concentrates said method including the steps of:a) feeding a mixture of lead dust and pyritic concentrate to a furnace containing molten slag;b) smelting the mixture by injecting air or oxygen enriched air into the slag by means of a submerged lance to produce a lead bearing slag; andc) recycling fume to the furnace.A method for the treatment of lead dusts, without pyritic concentrate, said method including the steps of:a) feeding lead dust to a furnace containing molten slag;b) smelting the dust by injecting air or oxygen enriched air into the slag by means of a submerged lance to produce a lead bearing slag; andc) recycling fume to the furnace.
    Type: Grant
    Filed: October 10, 1991
    Date of Patent: October 26, 1993
    Assignee: Mount Isa Mines Limited
    Inventors: Roger L. Player, Steven P. Matthew