Process for refining high-carbon ferro-alloys

US4130417A · kind A · utility

Assignee

• GfE Gesellschaft fur Elektrometallurgie mit beschrankter Haftung · DE

Inventors

• Friedrich Breuer · Eschweiler, DE
• Gunter Duderstadt · Ratingen, DE
• Werner Dresler · Würselen, DE
• Rudolf Fichte · Nuremberg, DE
• Peter Kunert · Laufenbürg, DE
• Gerd Nassauer · Jülich, DE

Key dates

• Filing date: Nov 9, 1977
• Grant date: Dec 19, 1978
• Expiry date: Nov 9, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21C7/0685
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A hign-carbon ferro-alloy, specifically ferrochrome or ferromanganese, is carburized in a converter in which oxygen or air is blown from below into the melt together with a surrounding protective gas. With the bath preheated to a temperature somewhat higher than the melting point of the ferro-alloy, the oxygen is introduced at such a rate that its reaction with the chromium or the manganese locally superheats the bath, in a region well below the surface and spaced from the converter walls, to a temperature high enough to let the resulting oxides react endothermically with the carbon. This reaction takes place in combustion zones believed to be localized in gas bubbles formed above the injection nozzles, the oxidation of the ferrous and nonferrous constitutents occurring at the interface between the gas and the melt with formation of a very thin and highly reactive oxide skin around each bubble. Some high-melting oxides of chromium or manganese may remain after the oxygen blow but can be reduced by blowing in powdered lime, after and possibly also with the oxygen, and by the deposition of solid or liquid reducing agents on the bath surface. A minor fraction of the ferro-alloy may be…