Process for a direct reduction of iron oxide containing materials in a rotary kiln

US4838934A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Gerd Elsenheimer · Frankfurt am Main, DE
• Wolfram Schnabel · Idstein, DE

Key dates

• Filing date: Jun 16, 1987
• Grant date: Jun 13, 1989
• Expiry date: Jun 16, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21B13/08
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The charge is moved through a rotary kiln countercurrently to the gas atmosphere. Solid carbonaceous reducing agent having a high content of volatile constituents is charged into the rotary kiln at its charging end. Solid carbonaceous reducing agent having a high content of volatile constituents is blown into the rotary kiln at its discharge end and is distributed over the charge in part of the length of the kiln. Oxygen-containing gases are supplied to the rotary kiln through its shell at a plurality of locations. In order to provide optimum operating conditions in the final zone of the kiln, solid carbonaceous material having a high content of volatile constituents is separated into a coarser fraction and a finer fraction, a part of the coarser fraction and a part of the finer fraction are mixed. The resulting mixture is blown by a blowing device into the rotary kiln at its discharge end, said mixture consists of an amount of 10 to 40% of the finer fraction and of an amount of 90 to 60% of the coarser fraction and is blown at a rate of up to 50% of the total feed rate of solid carbonaceous material. The blown mixture is distributed over up to 50% of the length of the kiln, and th…