Agent for desulfurizing crude iron and steel melts, and process for making it

US4323392A · kind A · utility

Inventors

• Albert Braun · Wissen, DE
• Willi Portz · Lechenich, DE
• Georg Strauss · Lechenich, DE

Key dates

• Filing date: May 9, 1980
• Grant date: Apr 6, 1982
• Expiry date: May 9, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21C1/025
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention provides an agent for desulfurizing crude iron and steel melts, the desulfurizing agent being based on calcium carbide containing calcium oxide. The desulfurizing agent is produced by admixing a calcium carbide melt having up to 45 weight % of calcium oxide therein with an excess of 3 to 15 weight %, based on the CaO-content of more than 45 up to 80 weight % desired for the final product, of calcium oxide. The resulting mixture is allowed to solidify and cool down to temperatures of 350.degree. to 450.degree. C. Next, the solidified melt is precrushed to material with a size of less than 150 mm. Particles with a size of less than 4 mm are screened off and the remaining material is comminuted, with the exclusion of moisture, to material with a size of less than 10 mm.