Process and apparatus for the production of ferrochromium

US4981510A · kind A · utility

Assignee

• Fried.Krupp Gesellschaft · DE

Inventors

• Wilhelm Janssen · Saterland, DE
• Klaus Ulrich · Heiligenhaus, DE

Key dates

• Filing date: Aug 4, 1989
• Grant date: Jan 1, 1991
• Expiry date: Aug 4, 2009

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F27D13/00
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

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. The reaction product is discharged from the rotary furnace in a doughy state and is cooled, either during or after discharging the reaction product from the rotary furnace, by mixing the reaction product with at least one additive effective for heating and decarbonation for a subsequent melting step, which at least one additive is at ambient temperature prior to being admixed, so that the mix…