(19)
(11) EP 0 065 854 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.01.1983 Bulletin 1983/04

(43) Date of publication A2:
01.12.1982 Bulletin 1982/48

(21) Application number: 82302448

(22) Date of filing: 13.05.1982
(84) Designated Contracting States:
DE GB

(30) Priority: 19.05.1981 US 265254

(71) Applicant: ALCAN INTERNATIONAL LIMITED
 ()

(72) Inventor:
  • Dubé, Ghyslain
     ()

   


(54) Removal of alkali metals and alkaline earth metals from molten aluminium


(57) A method of removing dissolved contaminant alkali metals and alkaline earth metals from molten aluminium by reaction of the contaminants with solid particulate materials comprising aluminium fluoride, wherein a body of the molten aluminium to be decontaminated is stirred, in the presence of the aluminium fluoride particles, in such manner as to generate and maintain a stable vortex in the molten body.






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