Aluminum dross processing

Details Aluminum dross processing Aluminum dross processing

1979-03-29

1981-02-24

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

75 24, 75 68R, 423131, 423627, C01F 702

Patent

active

042527767

ABSTRACT:
There is disclosed a method for the elimination of the chief impurities in aluminum dross tailings. The dross tailings, which are chiefly particles of aluminum oxide, are suspended in an aqueous slurry and the slurry is heated to a temperature from 185.degree.-225.degree. F. and maintained under liquification pressures and sufficient agitation to insure particle-to-particle attrition that removes an aluminum hydroxide coating which would otherwise inhibit the reaction. The reaction rate is accelerated by chemical and physical additives that can be optionally added to the slurry such as trace quantities of caustic, which serves as a source of hydroxyl ligands to increase the solubility of aluminum hydroxide and/or refractory particles such as ceramic spheres which increase the attrition. Other contaminants present in the dross tailings include aluminum nitride, which is decomposed to aluminum oxide and ammonia, and aluminum carbide which is decomposed to aluminum oxide and methane.

REFERENCES:
patent: 824092 (1906-06-01), Brunch
patent: 2758011 (1956-08-01), Bloch
patent: 2989372 (1961-06-01), Gilbert
patent: 3488147 (1970-01-01), Keith et al.
patent: 3955969 (1976-05-01), Johnson

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