Production of ferrochromium alloys

US4306905A · kind A · utility

Assignee

• The United States of America, as represented by The Secretary of The Interior · US

Inventors

• John E. Pahlman · Bloomington, US
• Sanaa E. Khalafalla · Minneapolis, US

Key dates

• Filing date: Oct 17, 1980
• Grant date: Dec 22, 1981
• Expiry date: Oct 17, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C35/005
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Ferrochromium alloys are prepared by vacuum reduction of chromite concentrate by means of a carbonaceous reductant, followed by melting in the presence of slag-forming materials to produce the alloy and a separate slag phase. Preferably, CaO is employed as an ingredient in both the reduction step and the melting step.