Direct fuel-fired furnace arrangement for the recovery of galliu

Details Direct fuel-fired furnace arrangement for the recovery of galliu Direct fuel-fired furnace arrangement for the recovery of galliu

1986-07-07

1987-02-17

Makay, Albert J.

Furnaces

With fuel treatment means

Means for liberating gas from solid fuel

75 25, 75 84, 110204, 110215, 110247, 266147, 266154, 266156, F23G 512

Patent

active

046431101

ABSTRACT:
A furnace arrangement utilizes a single vertically disposed shaft furnace incorporating the features of pellet drying and hardening, oxidizing heat-up, reducing roast and gas separation. The upper portion of the furnace dries and hardens "green" pellets while at the same time subjecting them to an oxidizing atmosphere and temperature increase. A stack of the pellets slowly moves downwardly through a transistion zone to a reducing atmosphere in a lower portion of the furnace. A heated reducing gas circulates through this lower portion and out of the furnace through a recovery system of the furnace arrangement. After the sublimate carried by the reducing gas is removed, the reducing gas is supplemented and returned to the lower portion of the furnace to again produce a reducing atmosphere. A smaller branch of cooled reducing gas enters the lower portion of the furnace adjacent the bottom to cool the pellet residue immediately prior to removal from the furnace.

REFERENCES:
patent: 3958919 (1976-05-01), Kjell-Berger
patent: 4076504 (1978-02-01), Oshida et al.
patent: 4235425 (1980-11-01), Beggs et al.
patent: 4270740 (1981-06-01), Sanzenbacher et al.
patent: 4366759 (1983-01-01), Foresto
patent: 4475993 (1984-10-01), Blander et al.
patent: 4488905 (1984-12-01), Santen
patent: 4579067 (1986-04-01), Peters

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