Patents by Inventor David J. Milne

David J. Milne 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).

  • Treatment of aluminous materials
    Patent number: 4548795
    Abstract: A leaching process employing acidic chloride solutions, whereby the iron content of aluminous materials such as lower grade iron-containing bauxite ores is reduced, enabling the obtention of valuable products such as metallurgical grade alumina and refractory grade bauxite, previously obtainable only from higher grade low-iron aluminous materials.
    Type: Grant
    Filed: May 10, 1984
    Date of Patent: October 22, 1985
    Assignee: Comalco Aluminum Limited
    Inventors: William H. Andrews, David J. Milne, Ronald W. Moyle, James P. Peters
  • Production of alumina
    Patent number: 4483830
    Abstract: A process for recovery of alumina and soda from materials containing sodium aluminosilicates, such as red mud and desilication products, comprises treating said materials with lime at elevated temperature and pressure. In a preferred embodiment of the invention, hydrothermal treatment of red mud with lime is integrated into a Bayer process to improve the overall efficiency of that process.
    Type: Grant
    Filed: September 3, 1982
    Date of Patent: November 20, 1984
    Assignee: Comalco Limited
    Inventors: Pearson J. Cresswell, David J. Milne
  • Treatment of aluminous materials
    Patent number: 4474736
    Abstract: A leaching process employing acidic chloride solutions, whereby the iron content of aluminous materials such as lower grade iron-containing bauxite ores is reduced, enabling the obtention of valuable products such as metallurgical grade alumina and refractory grade bauxite, previously obtainable only from higher grade low-iron aluminous materials.
    Type: Grant
    Filed: April 20, 1982
    Date of Patent: October 2, 1984
    Assignee: Comalco Aluminum Limited
    Inventors: William H. Andrews, David J. Milne, Ronald W. Moyle, James P. Peters