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. 19, 1988
Filed:
Apr. 16, 1986
Applicant:
Inventor:
Raymond Roumieu, La Voulte sur Rhone, FR;
Assignee:
Metaux Speciaux S.A., Paris, FR;
Primary Examiner:
Int. Cl.
CPC ...
C22B / ;
U.S. Cl.
CPC ...
75 63 ; 75 66 ; 75 1029 ;
Abstract
The invention relates to a process for purifying lithium in which the lithium is melted in an inert atmosphere. The molten lithium is then maintained at a temperature of 400.degree. to 700.degree. C. under a pressure of less than 10 Pascal while agitating the molten lithium to renew its exposed surface. In this manner, impurities in the lithium are virtually exclusively vaporized, without giving rise to substantial evaporation of lithium. The vaporized impurities are then condensed at a temperature of less than 100.degree. C. and the purified lithium is recovered in molten form.