Fine-grained agent for desulfurizing molten iron

US4764211A · kind A · utility

Assignees

• Thyssen Stahl AG · DE
• SKW Trostberg Aktiengesellschaft · DE

Inventors

• Walter Meichsner · Krefeld, DE
• Werner Gmohling · Hufschlag, DE
• Manfred Tutte · Moers, DE
• Karl-Heinz Peters · Duisburg, DE

Key dates

• Filing date: Dec 16, 1986
• Grant date: Aug 16, 1988
• Expiry date: Dec 16, 2006

Classification

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

Abstract

A fine-grained agent for desulfurizing molten iron comprising industrial calcium carbide, dried coal which contains at least 15% by weight of volatile constituents and which, immediately after being passed into the molten iron, releases at least 80 standard liters of gas per kg of coal, and optionally contains fine-grained magnesium. The coals used are lignites, flame coal, gas-flame coal, gas coal or coking coal. The agent is prepared by addition of the dried coal to the calcium carbide, if appropriate, pre-crushed, and common comminuted to a grain size of 90% <200 .mu.m. The fine-grained magnesium is present in the agent either in uniform distribution, or it is stored and fluidized separately from the carbide/coal mixture and added to the carbide/coal mixture in the transport line or in the lance, if appropriate, with variation during injection.