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:
Dec. 19, 1995
Filed:
Nov. 23, 1994
Pierre Faure, Annecy, FR;
Pechiney Electrometallurgie, Paris, FR;
Abstract
A process for recovery of magnesium from magnesium alloy waste by charging an electric furnace with a flux including at least one salt, the flux being inert with respect to magnesium and having a melting point <1000.degree. C. The flux is raised by the Joule effect at a reduced pressure to a temperature of 900.degree. to 1100.degree. C. to produce a bath having a density higher than that of magnesium, a vapor pressure <0.1 torr and an electrical resistivity of between 1 and 10 milliohm.m. The magnesium alloy waste is introduced in the bath, and magnesium and any other elements in the waste which are more volatile than magnesium are recovered from a vapor phase above the bath. Any elements in the waste which are less volatile than magnesium are recovered from a molten phase in a bottom portion of the furnace.