Cobalt extraction method

Patent metadata

Field	Value
Publication number	US-9011804-B2
Application number	US-201214001848-A
Country	US
Kind code	B2
Filing date	Nov 2, 2012
Priority date	Nov 9, 2011
Publication date	Apr 21, 2015
Grant date	Apr 21, 2015

Abstract

The objective of the present invention is to selectively extract cobalt from an acidic solution containing a high concentration of manganese. This cobalt extraction method extracts cobalt from an acidic solution containing manganese and cobalt by subjecting the acidic solution to solvent extraction by means of a valuable metal extraction agent comprising an amide derivative represented by general formula (I). The valuable metal extraction agent is represented by the general formula. In the formula: R 1 and R 2 each represent the same or different alkyl group; R 3 represents a hydrogen atom or an alkyl group; and R 4 represents a hydrogen atom or any given group aside from 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, the pH of the acidic solution is 3.5-5.5 inclusive.

First claim

The invention claimed is:

1. A cobalt extraction method, wherein an acid solution containing manganese and cobalt is subjected to solvent extraction by a valuable metal extraction agent comprising an amide derivative represented by general formula (I) to extract the cobalt from the acid solution:

wherein, R 1 and R 2 each represent the same or different alkyl groups; the alkyl group is optionally a straight chain or a branched chain; R 3 represents a hydrogen atom or an alkyl group; and R 4 represents a hydrogen atom or any group other than an amino group, which is bound to the α carbon as an amino acid.

2. The cobalt extraction method according to claim 1 , wherein the amide derivative is any one or more of glycinamide derivatives, histidinamide derivatives, lysinamide derivatives, aspartic acid amide derivatives and N-methylglycine derivatives.

3. The cobalt extraction method according to claim 1 or 2 , wherein the acid solution is subjected to the solvent extraction with the pH of the acid solution adjusted to a range of 3.5 to 5.5.

4. A cobalt extraction agent comprising an amide derivative represented by general formula (I):

wherein, R 1 and R 2 each represent the same or different alkyl groups;
the alkyl group is optionally a straight chain or a branched chain;
R 3 represents a hydrogen atom or an alkyl group; and
R 4 represents a hydrogen atom or any group other than an amino group, which is bound to the α carbon as an amino acid.

Assignees

• Univ Kyushu Nat Univ Corp
• Sumitomo Metal Mining Co
• Univ Kyushu Nat Univ Corp

Inventors

• Goto Masahiro
• Kubota Fukiko
• Baba Yuzo

Classifications

• C07D233/26

  Radicals substituted by carbon atoms having three bonds to hetero atoms · CPC title

• C07C237/06

  having the nitrogen atoms of the carboxamide groups bound to hydrogen atoms or to acyclic carbon atoms · CPC title

• Y02W30/84

  Recycling of batteries or fuel cells · CPC title

• C22B59/00

  Obtaining rare earth metals · CPC title

• C22B23/00

  Obtaining nickel or cobalt · CPC title