Patents Assigned to Koninklijke Nederlandsche Hoogovens en Staalfabrieken N.V.
  • Patent number: 4116681
    Abstract: Ore pellets of homogeneous composition and loose consistency, free of pellet germs and having a reduced content of adhesive, are formed by dry mixing ore powder of particle size less than 90 microns (preferably about 65% less than 40 microns), with a moisture content of less than 0.1%, and powdered adhesive, e.g. bentonite, 0.05 to 1 percent by volume preferably added over a period of at least 11/2 minutes; then adding to the dry mix 8 to 9% of water at 50.degree. to 90.degree. C., and then homogenizing by a plowing action by which the mass is torn and whipped apart without being allowed to perform a strong rolling action, preferably for only 50 to 90 seconds at a temperature of 60.degree. to 70.degree., rubbing under pressure also being avoided, after which the mixture is formed into pellets with addition of 0.4 to 0.5% of water during the forming process. The formed pellets may be roasted, baked or sintered.
    Type: Grant
    Filed: August 27, 1975
    Date of Patent: September 26, 1978
    Assignee: Koninklijke Nederlandsche Hoogovens en Staalfabrieken N.V.
    Inventors: Herman Radstake, Nicolas A. Hasenack, Anthonie Van Latenstein, Jacobus J. Burger