Ore roasting with recycle of gases

Details Ore roasting with recycle of gases Ore roasting with recycle of gases

1982-08-30

1984-03-20

Thomas, Earl C.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

423 53, 423606, C22B 102, C01G 3900

Patent

active

044378840

ABSTRACT:
Metal sulfide ores which contain organic matter are oxidized by roasting in a multiple hearth furnace, wherein at least a portion of gases formed during the oxidation is recycled from a higher-temperature, upper portion of the furnace to a lower-temperature, lower portion of the furnace. The control of air pollution from the furnace is facilitated by making some volatile organics, otherwise vented from the furnace, available for combustion, and by increasing the sulfur oxide concentration in the furnace gases.

REFERENCES:
patent: 1884348 (1932-10-01), Stimmel et al.
patent: 2046753 (1936-07-01), Stout et al.
patent: 2843430 (1958-05-01), Johnson
patent: 3871867 (1975-03-01), Last et al.
patent: 4034969 (1977-07-01), Grimes
patent: 4221588 (1980-09-01), Grimes
Paleshnikov et al., Chemical Abstracts, 80:72980u, (1974).

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