Patents Assigned to Chemetics International Co. Ltd.
  • Fluoride removal from sulphuric acid
    Patent number: 5324499
    Abstract: A process for the reduction in fluoride concentration in a fluoride-contaminated sulphuric acid which process comprises treating said sulphuric acid with a silicon compound to produce silicon tetrafluoride, and removing said silicon tetrafluoride to produce a purer sulphuric acid having a substantially reduced fluoride concentration. The process is of particular use for the removal of fluoride from waste sulphuric acid in the copper smelting industry to meet environmental concerns.
    Type: Grant
    Filed: September 7, 1993
    Date of Patent: June 28, 1994
    Assignee: Chemetics International Co. Ltd.
    Inventors: Lynda G. Sturgeoff, Graeme W. Norval, Frederick S. Przystal, Andrew E. Yethon