Method for hardening iron ore pellets

US4102674A · kind A · utility

Assignee

• Dr. C. Otto & Comp. GmbH

Inventors

• Kurt Osterloh · Bochum, DE
• Karl Peter · Bochum, DE
• Paul Gernhardt · Chesapeake, US
• Wolfgang Grams · Herne, DE
• Christian Hundeshagen · Bochum, DE
• Wilhelm Danguillier
• Siegfried Pohl · Oberschleißheim, DE

Key dates

• Filing date: Feb 7, 1977
• Grant date: Jul 25, 1978
• Expiry date: Feb 7, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10J2300/1253
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Iron ore pellets on a grid in a treatment chamber are hardened by contact with a heat treated, low calorific gas. The gas is generated in the gasification chamber of a slag bath generator. The generator receives a gasification agent and solid fuel that preferably further includes sulfur-binding materials, such as dolomite for generating a stream of low calorific gas. Inclined water-cooled pipes at the upper end of the slag bath generator extract liquid slag from the gas stream. The slag drips from the pipes into the slag bath generator. A mixing chamber receives the gas at a temperature of about 1450.degree. C passed beyond the inclined water-cooled pipes together with an air supply for heat treating the gas to a temperature of about 1100.degree. C. The heat treated gas is then passed into the treatment chamber for hardening the iron ore pellets contained therein.