Patents Assigned to Metallurgical Processes Ltd.
  • Roasting of sulphide materials
    Patent number: 4231791
    Abstract: A process for roasting zinc/lead sulphide materials, comprising forming substantially spherical pellets composed predominantly of lead sulphide, coating these with predominantly zinc sulphide material, and then roasting the coated pellets in a roasting apparatus to effect oxidation of sulphide, predominantly to oxide.
    Type: Grant
    Filed: July 5, 1979
    Date of Patent: November 4, 1980
    Assignees: Metallurgical Processes Ltd., I.S.C. Smelting Ltd.
    Inventor: James A. Charles
  • Condensation of zinc vapor
    Patent number: 4042379
    Abstract: Condensing zinc vapor by contacting hot gases containing zinc vapor with a spray of molten lead droplets within a multi-stage condenser with recirculation of the molten lead, wherein the temperature of the lead in an intermediate stage of the multi-stage condenser is controlled to be within the range of from 475.degree. to 515.degree. C, preferably by feeding hot lead from the first stage of the condenser into the intermediate stage via a duct leading through a baffle wall separating the first and intermediate stages.
    Type: Grant
    Filed: September 25, 1975
    Date of Patent: August 16, 1977
    Assignees: Metallurgical Processes Ltd., I.S.C. Smelting Limited
    Inventors: Colin Frank Harris, Michael William Gammon
  • Preparation of feed material for a blast furnace
    Patent number: 3946098
    Abstract: Producing a briquetted oxidic feed for a blast furnace by pelletizing very fine zinc oxide or zinc oxide and lead oxide powder into pellets having an average diameter of from 2 to 10 millimeters prior to briquetting the oxide pellets at a temperature of from 500.degree. to 800.degree.C and a pressure of from 1 to 20 tons/square inch.
    Type: Grant
    Filed: December 11, 1973
    Date of Patent: March 23, 1976
    Assignees: Metallurgical Processes Ltd., I.S.C. Smelting Limited (Metallurgical Development Company)
    Inventor: Colin Frank Harris