Method for treatment of potlining residue from primary aluminium

Details Method for treatment of potlining residue from primary aluminium Method for treatment of potlining residue from primary aluminium

1992-11-03

1994-02-15

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75672, 75674, C22B 2100

Patent

active

052862747

ABSTRACT:
This is a method for treatment of spent potlining from aluminium reduction cells including the refractory material in order to transfer the spent potlining to a form in which it can be used as a filler or as a raw material. The spent potlining is crushed and supplied to a closed electrothermic smelting furnace optionally together with a SiO.sub.2 source, wherein the spent potlining is melted at a temperature between 1300.degree. and 1750.degree. C. An oxidation agent is supplied to the furnace in order to oxidize carbon and other oxidizable components contained in the spent potlining such as metals, carbides and nitrides. Further, a source of calcium oxide is supplied to the smelting furnace in an amount necessary to react with all fluoride present to form CaF.sub.2 and to form a calcium aluminate or calcium aluminate silicate slag containing CaF.sub.2 which slag is liquid at the bath temperature in the furnace, and that the calcium aluminate or calcium aluminate silicate slag and optionally a metal phase are tapped from the furnace and cooled to blocks or granules.

REFERENCES:
patent: 4030914 (1977-06-01), Papafingos
patent: 4053375 (1977-10-01), Roberts et al.
patent: 4113832 (1978-09-01), Bell et al.
patent: 4444740 (1984-04-01), Snodgrass et al.
patent: 4735784 (1988-04-01), Davis et al.
patent: 5024822 (1991-06-01), Hittner et al.
Abstract, Nov. 1985, Section Ch. Week 8622, Derwent Publications Ltd., London, GB, Class C, AN 86-143075 & SU-A-1 189 883 (Zhdanov Metal Inst) 7.
Journal of Metals Jul. 1984, New York, pp. 22-32 L. C. Blayden et al. "Spent potlining symposium".

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