Process for the desulphurization treatment of pig iron melts

US5366539A · kind A · utility

Assignee

• Thyssen Stahl AG · DE

Inventors

• Karl-Heinz Abele · Dinslaken, DE
• Heinz van den Boom · Duisburg, DE
• Alfred Ender · Duisburg, DE
• Eckart Hees · Dinslaken, DE
• Walter Meichsner · Krefeld, DE

Key dates

• Filing date: Aug 18, 1992
• Grant date: Nov 22, 1994
• Expiry date: Aug 18, 2012

Classification

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

Abstract

The invention relates to a process for the desulphurization treatment of a pig iron melt in a container. The characterizing feature of the invention is that the treatment is performed in three phases: In the initial phase such solids are injected that deoxidize the initial slag and increase its basicity and also produce a circulatory movement of the melt and form a basic deoxidized cover slag. In the middle phase the desulphurizing agent is injected for the main desulphurization and in the final phase such solids are injected that purify the melt and produce a final desulphurization and also so influence the desulphurization slag formed that its content of iron granules is low.