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:
Feb. 04, 1986
Filed:
Feb. 04, 1985
Sylvestre Vire, Neuhausen am Rheinfall, CH;
Swiss Aluminium Ltd., Chippis, CH;
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.