Solid Reductant Is Recycled Patents (Class 75/478)
  • Reduction of titaniferous ores and apparatus
    Patent number: 5403379
    Abstract: A process for treating titaniferous material by treating the titaniferous material and a particulant carbonaceous material in a kiln, recovering reduced titaniferous material and particulant char from the kiln and separating the particulant char, recycling the recovered separated char to the kiln in the region of the discharge port by blowing the char entrained in a fluid stream so that the blown char burns in the kiln largely as a flame in the region of the discharge port.
    Type: Grant
    Filed: May 12, 1993
    Date of Patent: April 4, 1995
    Assignee: RGC Mineral Sands Limited
    Inventor: Ivan W. George
  • Apparatus for the extraction of metals from metal-containing raw materials
    Patent number: 5314171
    Abstract: Metal-containing ores are extracted by a process and apparatus which avoid contaminating the product with fuel gas components. In a rotary kiln, a heat shock-resistant ceramic pipe is subjected to indirect high temperature heating, thereby allowing the extraction reaction to be conducted without heat producing fuel gases.
    Type: Grant
    Filed: March 9, 1993
    Date of Patent: May 24, 1994
    Assignee: Osaka Fuji Corporation
    Inventors: Hans A. Friedrichs, Leonid W. Ronkow