Patents Assigned to Fried.Krupp Gesellschaft
  • Patent number: 4981510
    Abstract: A process and apparatus for producing ferrochromium having a carbon content ranging from about 0.02 to about 10 weight percent includes providing a mixture comprised of iron-containing chromium ore, coal, and at least one slag former selected from each of a slag former of group (a) and a slag former of group (b), wherein the slag former of group (a) is selected from the group consisting of CaO and MgO, wherein the slag former of group (b) is selected from the group consisting of Al.sub.2 O.sub.3 and SiO.sub.2, and wherein the mixture has an ore or coal ratio ranging from 1:0.4 to 1:2. The mixture is heated in a rotary furnace for a period ranging from 20 to 240 minutes in a CO-containing atmosphere and at a temperature ranging from 1480.degree. to 1580.degree. C. to provide a reaction product.
    Type: Grant
    Filed: August 4, 1989
    Date of Patent: January 1, 1991
    Assignee: Fried.Krupp Gesellschaft
    Inventors: Wilhelm Janssen, Klaus Ulrich