Method for removing iron from iron-containing solution and method for recovering valuable metals

Patent metadata

Field	Value
Publication number	US-10443111-B2
Application number	US-201615563478-A
Country	US
Kind code	B2
Filing date	Mar 29, 2016
Priority date	Mar 31, 2015
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

The present invention provides a method for removing iron from an iron-containing solution containing an iron ion, comprising adding a lithium ion battery cathode material containing manganese to an acidic sulfuric acid solution to obtain a cathode material-containing solution, and then precipitating a manganese ion as manganese dioxide in a mixed solution obtained by mixing the iron-containing solution with the cathode material-containing solution while precipitating the iron ion contained in the iron-containing solution as a solid.

First claim

What is claimed is:

1. A method for removing iron from an iron-containing solution containing an iron ion, comprising:
adding a lithium ion battery cathode material containing manganese to an acidic sulfuric acid solution to obtain a cathode material-containing solution, and then precipitating a manganese ion as manganese dioxide in a mixed solution obtained by mixing the iron-containing solution with the cathode material-containing solution while precipitating the iron ion contained in the iron-containing solution as a solid.

2. The method for removing iron from the iron-containing solution according to claim 1 , wherein an iron ion concentration in the iron-containing solution is from 50 mg/L to 1 g/L.

3. The method for removing iron from the iron-containing solution according to claim 1 , wherein a pH of the mixed solution obtained by mixing the iron-containing solution with the cathode material-containing solution is from 1 to 2.

4. The method for removing iron from the iron-containing solution according to claim 1 , wherein an oxidation-reduction potential value of the mixed solution obtained by mixing the iron-containing solution with the cathode material-containing solution is 900 mV or more.

5. The method for removing iron from the iron-containing solution according to claim 1 , wherein hydrogen peroxide water is added when the lithium ion battery cathode material containing manganese is leached.

6. The method for removing iron from the iron-containing solution according to claim 1 , wherein manganese dioxide is added to the mixed solution obtained by mixing the iron-containing solution with the cathode material-containing solution.

7. The method for removing iron from the iron-containing solution according to claim 6 , wherein manganese dioxide added to the mixed solution is manganese dioxide contained in a leached residue of a lithium ion battery cathode material containing manganese.

8. The method for removing iron from the iron-containing solution according to claim 1 , wherein the lithium ion battery cathode material further comprises, in addition to manganese, at least one cathode material-forming metal making up the lithium ion battery cathode material, and wherein the iron-containing solution further comprises the cathode material-forming metal before mixed with the cathode material-containing solution.

9. The method for removing iron from the iron-containing solution according to claim 8 , wherein the at least one cathode material-forming metal is cobalt and/or nickel.

10. A method for recovering at least one valuable metal from at least one cathode material-forming metal contained in a lithium ion battery cathode material and an iron-containing solution by using the method for removing iron from the iron-containing solution according to claim 8 , comprising:
carrying out the method for removing iron from the iron-containing solution, and then recovering the at least one valuable metal in the iron-containing solution as well as the at least one valuable metal in the lithium ion battery cathode material.

Assignees

• Jx Nippon Mining & Metals Corp

Inventors

• Arakawa Junichi
• Ito Junichi
• Yokota Takuya

Classifications

• C22B23/00

  Obtaining nickel or cobalt · CPC title

• C22B7/00

  Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; {Methods of a general interest or applied to the winning of more than two metals (briquetting of scrap C22B1/248; preliminary treatment of scrap C22B1/005)} · CPC title

• C22B47/00

  Obtaining manganese · CPC title

• C01G45/02

  Oxides · CPC title

• C01G49/02

  Oxides; Hydroxides {(C01G49/0018 takes precedence)} · CPC title