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:
Mar. 17, 1998
Filed:
Sep. 23, 1996
Akira Asada, Hyogo-ken, JP;
Santoku Metal Industry Co., Ltd., Kobe, JP;
Abstract
A method for recovering reusable rare earth compounds such as rare earth oxides, rare earth fluorides, or rare earth metals from rare earth alloy scrap in an effective and safe manner. The method includes the steps of: (a) pulverizing rare earth alloy scrap at least by hydrogenating the alloy scrap to obtain pulverized alloy scrap, (b) heating the pulverized alloy scrap to obtain an oxide, (c) contacting the oxide with an acid solution to leach rare earth element into the acid solution in the form of ions, and filtering a resulting solution containing rare earth ions to obtain a filtrate, and (d) forming a precipitate containing rare earth element from the filtrate.