The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 1985
Filed:
Jul. 13, 1983
Tibor Kugler, Thayngen, CH;
Swiss Aluminium Ltd., Chippis, CH;
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.