Patents by Inventor Christine A. Rushforth

Christine A. Rushforth 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).

  • Recovery of alumina from bauxite
    Patent number: 5120513
    Abstract: A Bayer alumina recovery process is described in which lime is added at an intermediate or final wash stage of the red mud recovery circuit to improve flocculation, especially with flocculants having lower anionic content. The process is particularly useful with liquors containing high amounts of sodium carbonate and for process where the mud is settled by mud stacking.
    Type: Grant
    Filed: July 18, 1989
    Date of Patent: June 9, 1992
    Assignee: Allied Colloids Limited
    Inventors: Gillian M. Moody, Trevor K. Hunter, Christine A. Rushforth
  • Recovery of alumina trihydrate in the Bayer process
    Patent number: 5041269
    Abstract: In a Bayer process for production of aluminum, alumina trihydrate crystals are formed in the pregnant liquor and are flocculated using a combination of dextran and synthetic polymer, usually a homo- or copolymer of acrylic acid. The process is particularly advantageous where the liquor contains organic components such as humate and/or oxalate.
    Type: Grant
    Filed: April 10, 1990
    Date of Patent: August 20, 1991
    Assignee: Allied Colloids Ltd.
    Inventors: Gillian M. Moody, Christine A. Rushforth
  • Recovery of alumina from bauxite
    Patent number: 5008089
    Abstract: Red mud in Bayer process liquors are flocculated using dextran and synthetic anionic polymer in the same stage, usually added separately to the liquor. The liquor may be the primary settler slurry, the secondary clarification liquor or one or more of the red mud washing stages. The process is of particular advantage where the liquors are high in carbonate content and/or total alkalinity.
    Type: Grant
    Filed: October 13, 1989
    Date of Patent: April 16, 1991
    Assignee: Allied Colloids Limited
    Inventors: Gillian M. Moody, Christine A. Rushforth