Process for a direct reduction of iron oxide containing material

Details Process for a direct reduction of iron oxide containing material Process for a direct reduction of iron oxide containing material

1987-06-16

1989-06-13

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

266173, C21B 1106

Patent

active

048389340

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 the remaining solid carbonaceous material is charged into the rotary kiln at its charging end.

REFERENCES:
patent: 3890138 (1975-06-01), Hockin
patent: 4375883 (1983-03-01), Keran et al.
patent: 4581061 (1986-04-01), Ulrich et al.

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