METHOD FOR REMOVING IRON FROM IRON-CONTAINING SOLUTION AND METHOD FOR RECOVERING VALUABLE METALS

• US 20180073098A1
• Filed: 03/29/2016
• Published: 03/15/2018
• Est. Priority Date: 03/31/2015
• Status: Active Grant

• Current Assignee: JX Nippon Mining & Metals Corporation (ENEOS Holdings, Inc.)
• Original Assignee: JX Nippon Mining & Metals Corporation (ENEOS Holdings, Inc.)
• Inventors: ARAKAWA, Junichi, ITO, Junichi, YOKOTA, Takuya
• Granted Patent: US 10,443,111 B2
• Time in Patent Office: Days
• CPC Class Codes: C01G 45/02 Oxides; Hydroxides
• CPC Class Codes: C01G 49/02 Oxides; Hydroxides C01G49/0018 takes precedence
• CPC Class Codes: C22B 23/00 Obtaining nickel or cobalt
• CPC Class Codes: C22B 3/08 Sulfuric acid , other sulfurated acids or salts thereof
• CPC Class Codes: C22B 3/44 by chemical processes treatment or purification of solutions by liquid-liquid extraction C22B3/26, by ion-exchange extraction C22B3/42
• CPC Class Codes: C22B 47/00 Obtaining manganese
• CPC Class Codes: C22B 7/00 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 Class Codes: C22B 7/007 by acid leaching
• CPC Class Codes: H01M 10/54 Reclaiming serviceable parts of waste accumulators
• CPC Class Codes: Y02P 10/20 Recycling
• CPC Class Codes: Y02W 30/84 Recycling of batteries or fuel cells

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.

Claims

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 ORP 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 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 in advance.

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 as the at least one cathode material-forming metal contained in the lithium ion battery cathode material and the 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 contained in the iron-containing solution as well as the at least one valuable metal contained in the lithium ion battery cathode material.