Chemistry: electrical and wave energy – Processes and products
Patent
1990-10-04
1992-04-28
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
204245, 204247, C25C 306, C25C 314, C25C 322
Patent
active
051085577
ABSTRACT:
Improved methods and apparatus for carrying out the methods are disclosed for feeding alumina into a Soderberg type aluminum reduction cell (10), so as to maximize efficiency of the cell. The apparatus includes a continuous point feeder assembly (12) connected to the cell structure over an exposed peripheral portion of the cryolite bath. The feeder assembly includes as alumina feed hopper (40) and a pair of vertically disposed feeding bins (56). Each feeding bin receives alumina from the hopper. A piston and cylinder assembly (46) is connected to the feeder assembly and arranged to drive a crust breaking member (44) down through bath crust (17) to form a temporary opening. The crust breaking member includes discharge port covers (62) which cover the lower ends of the feeding bins when the crust breaking member is retracted, and uncover the lower ends when the crust breaking member is extended, thereby opening feed discharge ports (60) and allowing a predetermined quantity of alumina to flow through the opening and into the bath. The point feeder assembly is actuated at predetermined, frequent intervals and the hopper refilled as necessary. Occasionally, the peripheral curst is broken by an elongate horizontal breaker bar (34) and a supplemental charge of alumina is forced into the bath to achieve maximum concentration.
REFERENCES:
patent: 3192140 (1965-06-01), Zorzenoni
patent: 3551308 (1970-12-01), Capitaine et al.
patent: 3673075 (1972-06-01), Kibby
patent: 4002551 (1977-01-01), Duclaux et al.
patent: 4302302 (1981-11-01), Kaifuchi
patent: 4437964 (1984-03-01), Gerphagnon et al.
patent: 4525105 (1985-06-01), Jaggi
Northwest Aluminum Company
Valentine Donald R.
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