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:
Jul. 07, 2015
Filed:
Dec. 28, 2011
Yukinori Sudo, Shunan, JP;
Takashi Sakaki, Shunan, JP;
Yukinori Sudo, Shunan, JP;
Takashi Sakaki, Shunan, JP;
TOSOH CORPORATION, Yamaguchi, JP;
Abstract
To provide a method for recovering a precious metal from a solution containing precious metal ions, an extracting agent or adsorbent used therefor, and a back-extracting agent or desorbent. An extracting agent or adsorbent in which precious metal ions are extracted or adsorbed, is brought into contact with a back-extracting agent or desorbent containing a sulfur-containing amino acid derivative represented by the following formula (I): wherein Ris a methyl group, an ethyl group, a vinyl group, a Clinear, branched or cyclic hydrocarbon group, or a Caromatic hydrocarbon group, R's are each independently a hydrogen atom, a methyl group, an ethyl group, a vinyl group, a Clinear, branched or cyclic hydrocarbon group or a Caromatic hydrocarbon group, and n is 0 or 1, to obtain a solution containing the precious metal ions, which is subjected to a reduction treatment to obtain a precious metal.