Process for refining scrap aluminum

Details Process for refining scrap aluminum Process for refining scrap aluminum

1985-02-04

1986-02-04

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

75 68R, C22B 2100, C25C 306

Patent

active

045684308

ABSTRACT:
A salt melt of alkali and/or alkali earth chlorides and fluorides, heated to 50.degree.-100.degree. C. above the melting point is employed to purify heavily contaminated scrap aluminum. The scrap aluminum, preheated to 400.degree.-500.degree. C. is added to a melting or holding furnace containing the less dense salt melt, the mixture stirred if necessary and then held at the above mentioned melt temperature for at least one hour. First the sedimented metal phase, then the salt melt are filtered through a resistant open pore ceramic filter and thus freed of solid impurities. The aluminum is transferred to an electrolytic cell for purification, and the molten salt melt recycled.

REFERENCES:
patent: 3846123 (1974-11-01), Racunas et al.

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