Patents by Inventor Wayne W. Hazen

Wayne W. Hazen 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).

  • Patent number: 5078786
    Abstract: This invention concerns a process for recovering metal values from jarosite-containing materials by leaching with a calcium chloride solution at a temperature above about the atmospheric boiling point of the solution and under at least the autogenous pressure.
    Type: Grant
    Filed: May 26, 1989
    Date of Patent: January 7, 1992
    Assignee: Resource Technology Associates
    Inventors: Mark A. Peters, Wayne W. Hazen, James E. Reynolds
  • Patent number: 4618480
    Abstract: A novel process for the recovery of alumina and potassium sulfate from alunite is provided comprising leaching the alunite with potassium hydroxide to which no sodium materials have been added, said leach solution being saturated with potassium sulfate. Aluminum values are solubilized into the leachate, and potassium and sulfur values are rendered soluble, but remain in the residue. The leachate is desilicated if necessary, preferably with lime, and aluminum trihydroxide is precipitated therefrom, followed by calcining to alumina product. The residue is leached to solubilize potassium sulfate in a secondary leach and the potassium sulfate product crystallized therefrom. Potassium hydroxide is regenerated from a portion of the potassium sulfate secondary leachate by several methods.Novel procedures for regenerating alkali metal hydroxides from the corresponding sulfates are also provided including routes involving formates and carbonates as intermediates and pyrohydrolysis.
    Type: Grant
    Filed: August 15, 1984
    Date of Patent: October 21, 1986
    Assignee: Resource Technology Associates
    Inventors: Wayne W. Hazen, David L. Thompson, James E. Reynolds, Nicholas J. Lombardo, Paul B. Queneau, John P. Hager
  • Patent number: 4057611
    Abstract: An improvement in the process for the recovery of aluminum from alunite in which the alunite in particulate form is dehydrated, sulfur and alkali metal compounds removed from the dehydrated ore leaving a particulate residue containing aluminum values, the residue digested with at least one alkali metal hydroxide to convert the aluminum values to soluble aluminates, silicon removed from the soluble aluminate solution, and aluminum values precipitated from the aluminate solution, the improvement comprising: multiple stage digestion of the particulate residue accomplished by dividing the particulate residue into two fractions, digesting one fraction first and using the first stage liquor from the first digestion step to digest the remaining fraction. The fraction digested first may be the one having the smaller particle size, or the one having the larger particle size.
    Type: Grant
    Filed: May 31, 1977
    Date of Patent: November 8, 1977
    Assignees: Southwire Company, National Steel Corporation, Earth Sciences, Inc.
    Inventors: Larry D. Jennings, Wayne W. Hazen