Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
VALUABLE METAL EXTRACTION AGENT AND VALUABLE METAL EXTRACTION METHOD USING SAID EXTRACTION AGENT
Document Type and Number:
WIPO Patent Application WO/2013/069562
Kind Code:
A1
Abstract:
The objective of the present invention is to selectively extract light rare earth metals, and by extension, europium, from an acidic solution containing a plurality of types of rare earth metal. This valuable metal extraction agent is represented by the general formula. In the formula: R1 and R2 each indicate the same or different alkyl group; R3 indicates a hydrogen atom or an alkyl group; and R4 indicates a hydrogen atom or any given group other than an amino group bonded to the α carbon as an amino acid. Preferably, the general formula has a glycine unit, a histidine unit, a lysine unit, an aspartic acid unit, or an N-methylglycine unit. Preferably, when extracting europium using the extraction agent, the pH is adjusted into the range of 2.0-3.0 inclusive, and when selectively extracting light rare earth metals, the pH is adjusted to 1.7-2.7 inclusive.

Inventors:
GOTO MASAHIRO (JP)
KUBOTA FUKIKO (JP)
BABA YUZO (JP)
Application Number:
PCT/JP2012/078445
Publication Date:
May 16, 2013
Filing Date:
November 02, 2012
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
UNIV KYUSHU NAT UNIV CORP (JP)
SUMITOMO METAL MINING CO (JP)
International Classes:
C22B3/26; B01D11/04; C01F17/17; C01F17/276; C22B59/00; H01M10/54
Foreign References:
JP2007327085A2007-12-20
Other References:
HIROFUMI MORIZONO ET AL.: "Liquid-liquid extraction of transition metal ions with an alkylhistidine extractant", SEPARATION AND PURIFICATION TECHNOLOGY, vol. 80, no. 2, 29 July 2011 (2011-07-29), pages 390 - 395, XP028237907
K. SHIMOJO; H. NAGANAWA; J. NORO; F. KUBOTA; M. GOTO: "Extraction behavior and separation of lanthanides with a diglycol amic acid derivative and a nitrogen-donor ligand", ANAL. SCI., vol. 23, December 2007 (2007-12-01), pages 1427 - 30, XP002597764, DOI: doi:10.2116/analsci.23.1427
See also references of EP 2679693A4
Attorney, Agent or Firm:
SHOBAYASHI, Masayuki et al. (JP)
Right wood Masayuki (JP)
Download PDF:
Claims: