System for recycling char in iron oxide reducing kilns

Details System for recycling char in iron oxide reducing kilns System for recycling char in iron oxide reducing kilns

1981-11-06

1983-03-08

Ozaki, G.

Metallurgical apparatus

With control means responsive to sensed condition

With means responsive to condition of treated material

266173, C21B 1308

Patent

active

043758835

ABSTRACT:
A method and means for improving the efficiency of the process for directly reducing ore containing iron oxide in a rotary kiln using a solid carbonaceous reducing agent, such as coal, introduced from the ore feed and discharge ends of the kiln, as both fuel and reductant, is disclosed wherein the charred coal or char found in the discharge product is recycled into the process at the discharge end of the kiln rather than the feed end as in the prior art. In particular, the recovered char, both coarse and finer particles, are transported to a recycle bin from which they are returned at a preselected rate to the kiln process by being injected along with the coal blown into the discharge end of the kiln. Alternatively, the recycle char alone may be fed without any coal at the discharge end of the kiln.

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