Patents Assigned to Nu-West Industries, Inc.
  • Method of production of high purity silica
    Patent number: 5679315
    Abstract: The present invention provides a basic method for producing high purity silica and ammonium fluoride from silicon tetrafluoride-containing gas, particularly the gas generated by acidulation. The basic method comprises recovering silicon tetrafluoride-containing gas from the acidulation of a fluorine-containing phosphorus source, separating liquid entrainment from the gas, converting the gas recovered to an ammonium fluosilicate solution, and ammoniating said ammonium fluosilicate solution to produce high purity silica and ammonium fluoride.
    Type: Grant
    Filed: September 25, 1995
    Date of Patent: October 21, 1997
    Assignee: Nu-West Industries, Inc.
    Inventors: Daniel C. Neuman, Clint R. Humpherys