Smelting reduction

Details Smelting reduction Smelting reduction

1986-11-06

1987-10-20

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 21, 75 29, 75 82, C22B 502

Patent

active

047012170

ABSTRACT:
Smelting reduction of metallic oxide material, e.g. pelletized iron oxide ore or iron oxide ore fines is effected by contacting such material with a circulating molten carrier material, e.g. molten iron in the case of iron oxide smelting, in a furnace, and by introducing a carbonaceous reductant e.g. coal into the carrier material. The reductant converts the metal oxide to metal in a smelting reduction zone. Carbon monoxide thereby produced is combusted in a heating zone through which the carrier material passes to effect heat recovery. Slag is removed from the carrier material surface before entering the heating zone. A protective layer of molten material, e.g. lead, which is substantially stationary is maintained below the circulating carrier material to inhibit erosion of the furnace hearth.
In other processes, deepsea manganese nodules are conjointly smelted with chalcopyrite in a circulating molten Cu-Ni-Co matte carrier while maintaining a protective layer of Cu-Ni-Co alloy below the matte; and high silica nickel laterite and limonitic ores are conjointly metallized and sulphided while being supported by a circulating molten nickel matte carrier, with controlled addition of carbon to cause a protective layer of ferronickel alloy containing carbon to be maintained below the matte carrier.

REFERENCES:
patent: 3326671 (1967-06-01), Worner
patent: 3955970 (1976-05-01), Claxton

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