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:
May. 06, 1997
Filed:
Dec. 23, 1993
Wataru Shirato, Ibaraki-ken, JP;
Yoshinobu Kamei, Ibaraki-ken, JP;
Mitsubishi Nuclear Fuel Company, Ltd., Tokyo, JP;
Abstract
A method of adsorbing and separating a heavy metal element by using a tannin adsorbent comprising: (a) adjusting the pH of a solution containing a plurality of heavy metal elements to a predetermined pH; (b) contacting the adsorbent with the solution in which the pH thereof is adjusted; (c) adjusting the pH of the solution contacted with the adsorbent to a pH different from the predetermined pH; and (d) contacting the solution in which the pH thereof is adjusted at the step (d) with the adsorbent prepared at the step (a). According to the inventive method, all of the heavy metal elements can be efficiently separated and adsorbed by using a tannin adsorbent from a solution containing a number of heavy metal elements. A method of regenerating a tannin adsorbent are also disclosed.