Process for purifying aluminum with sodium

Details Process for purifying aluminum with sodium Process for purifying aluminum with sodium

1983-07-13

1985-04-16

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 68R, C22B 2106

Patent

active

045113980

ABSTRACT:
Aluminum contaminated with at least one of the metals of the groups II b, III a, IV a and V a of the periodic table of elements is purified by means of sodium applied in liquid extraction in a separating column in the temperature range between the melting point of the aluminum or aluminum alloys and the boiling point of sodium. The pre-heated sodium is introduced into the separating column from a circuit having a heat exchanger, solids precipitator, pump and storage tank, in quantities at least 5 times greater than the mass of contaminating metal. The sodium flows countercurrent to the contaminated aluminum which is also introduced into the separating column. The purified aluminum containing a small residual amount of contaminating metal and a sodium content not exceeding 500 ppm is removed from the separating column. The sodium containing a low concentration of contaminating metal is returned to the circuit.

REFERENCES:
patent: 2239277 (1941-04-01), Stroup
patent: 4093194 (1978-06-01), Clare et al.

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