Method using selected carbons to react with Al2O and Al...

Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes

Reexamination Certificate

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C075S010360, C075S674000, C423S247000, C423S439000

Reexamination Certificate

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06849101

ABSTRACT:
In a method for recovering Al from an off-gas (3,4) produced during carbothermic reduction of aluminum utilizing at least one smelter (1,2), the off-gas (3,4) is directed to an enclosed reactor (5) which is fed a supply of wood charcoal (7) having a porosity of from about 50 vol. % to 85 vol. % and an average pore diameter of from about 0.05 μm to about 2.00 μm, where the wood charcoal (7) contacts the off-gas (3,4) to produce at least Al4C3(6), which is passed back to the smelter (1,2).

REFERENCES:
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patent: 4099959 (1978-07-01), Dewing et al.
patent: 4261736 (1981-04-01), Dewing et al.
patent: 4486229 (1984-12-01), Troup et al.
patent: 4491472 (1985-01-01), Stevenson et al.
patent: 6124028 (2000-09-01), Nagle et al.
patent: 6440193 (2002-08-01), Johansen et al.
patent: 6530970 (2003-03-01), Lindstad
patent: 1185435 (1985-04-01), None
FAO Forestry Department, Simple Technologies for Charcoal Making, FAO Forestry Paper 41, 1987, 7 pages, Rome, Italy.

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