C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/8
C22B 1/16 (2006.01) C22B 1/24 (2006.01)
Patent
CA 1095256
10,983 PROCESS FOR UPGRADING IRON ORE PELLETS ABSTRACT OF THE DISCLOSURE In a process for hardening oxidizable green iron ore pellets in a grate-kiln furnace, said process comprising passing the grate with a bed of pellets thereon along a horizontal path through the furnace to dry and preheat the pellets and then introducing the pellets into the kiln to undergo additional heating and induration, all by contact with hot gases, said grate passing through a preheating zone in which the average pellet temperature in the bed is in the range of about 1100°F to about 2200°F and in which zone the flow of gases is in a downward direction towards the bed of pellets on the grate the improving comprising: (a) covering the periphery of at least part of the zone with at least two hoods to provide a hooded area on each side of the top of the grate under which the periphery of the grate passes; (b) passing at least one oxygen stream within each hooded area in such a manner that the stream flows in a downward direction towards and through the periphery of the bed of pellets on the grate passing through the hooded areas; and (c) passing the periphery of the bed of pellets on the grate through the hoods areas in such a manner that the residence time of such pellets in the hooded areas is at least about 5 seconds. S P E C I F I C A T I O N - 1 -
284070
Hopley William G.
Union Carbide Corporation
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