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:
Jun. 11, 2019
Filed:
Mar. 26, 2015
Hitachi Metals, Ltd., Tokyo, JP;
Hiroyuki Hoshi, Mishima-gun, JP;
Yu Miyamoto, Mishima-gun, JP;
HITACHI METALS, LTD., Tokyo, JP;
Abstract
An object of the present invention is to provide a method for recovering a rare earth element, including subjecting a workpiece containing at least a rare earth element and an iron group element to an oxidation treatment, then turning the treatment environment into an environment where carbon is present, and subjecting an oxidation-treated workpiece to a heat treatment, thereby separating a rare earth element in the form of an oxide from an iron group element, according to which an oxide of a rare earth element can be efficiently separated from an iron group element at low treatment cost, and also wear and damage to the treatment container can be suppressed to allow the container to be used repeatedly for a long period of time. The method of the present invention as a means for resolution is characterized in that the oxidation-treated workpiece is mixed with petroleum coke as a carbon supply source, placed in a treatment container, and then subjected to the heat treatment in an inert gas atmosphere or in vacuum at a temperature of 950° C. to 1150° C. (excluding 1150° C.).