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:
Jan. 02, 1990
Filed:
Oct. 01, 1986
Cyuzaburo Tanaka, Kitaibaraki, JP;
Teruyoshi Yazama, Katsuta, JP;
Yoshiki Miyajima, Naka, JP;
Masaharu Kashiwa, Hitachi, JP;
Hiroshi Sugai, Suginami, JP;
Sumitomo Metal Mining Company Limited, Tokyo, JP;
Abstract
High-purity uranium can be effectively recovered from gadolinium-containing nuclear fuel scraps by dissolving the scraps in a mineral acid, extracting uranium from the resulting solution with a solvent, washing the organic phase with water or a dilute mineral acid, and counter-extraction with water or a dilute mineral acid. This invention also provides an efficient method of recovering high-purity gadolinium from the acidic washings coming from the above washing step and containing small amounts of radioactive elements (uranium, thorium and others) by adding an alkali, removing the precipitate thus formed, lowering the pH of filtrate to 2 or less, and adding an oxalic acid source to precipitate gadolinium oxalate.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile