Method of charging fine-grained metals into an electric-arc furnace

US8391331B2 · kind B2 · utility

Assignees

• Outotec Oyj · FI
• SMS SIEMAG AG · DE

Inventors

• Heinz Eichberger · Bad Soden, DE
• Karl-Josef Schneider · Schermbeck, DE

Key dates

• Filing date: Jul 1, 2004
• Grant date: Mar 5, 2013
• Expiry date: Mar 27, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In a method of charging fine-grained metals, in particular directly reduced iron (DRI), into an electric-arc furnace (1), the metal is supplied via a downpipe (12) to an opening (10) provided in the furnace roof (4), is introduced into the furnace (1) through this opening (10) as bulk material stream (11), and falls onto the melt (13) merely by gravity. Further, an electric-arc furnace (1) suited for this purpose is described. A rather loss-free introduction even of fine-grained material having a mean grain size of less than 1 mm is achieved by passing the bulk material stream (11) through a dosing orifice (8) after the downpipe (12) and before entering the furnace (1). The bulk material stream (11) then enters the furnace essentially undisturbed.