Process for the two-stage reduction of iron ore in a rotary kiln

Details Process for the two-stage reduction of iron ore in a rotary kiln Process for the two-stage reduction of iron ore in a rotary kiln

1976-01-21

1976-10-05

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 40, C21B 1106

Patent

active

039842312

ABSTRACT:
A process for the two-stage reduction of iron ore in a rotary kiln, which is an improvement on U.S. Pat. No. 3,833,355. A layer of reducing agent such as coke is held against the side wall of a reactor that rotates about its vertical axis, by centrifugal force and its own friction. The next inner layer is a layer of iron ore. The improvement over the earlier patent is that reduction is conducted in two stages comprising a first relatively low temperature stage of 1 to 4 hours at 700.degree. to 1100.degree.C., which does not melt the ore, and a second relatively high temperature stage of 0.5 to 1.5 hours at 1450.degree. to 1550.degree.C., with removal of the reduced carburized liquid iron from the bottom of the reactor during the second stage.

REFERENCES:
patent: 2862811 (1958-12-01), Eketorp et al.
patent: 3092490 (1963-06-01), Ednie
patent: 3511644 (1970-05-01), Josetsson et al.
patent: 3833355 (1974-09-01), Ramacciotti

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