Method for recovering valuable element and method for producing metal

Patent metadata

Field	Value
Publication number	US-2026024831-A1
Application number	US-202318875422-A
Country	US
Kind code	A1
Filing date	Jul 19, 2023
Priority date	Jul 28, 2022
Publication date	Jan 22, 2026
Grant date	—

Abstract

A method recovers a valuable element, by which method Ni and Co can be selectively recovered. In the recovery method, an oxide is reduced by adding a reductant and a flux containing CaO and SiO 2 to the oxide, followed by heating, the oxide containing: at least one element selected from the group made of nickel and cobalt; and manganese. The reductant contains a carbon-containing substance and an iron-containing substance, and the iron-containing substance is at least one selected from the group made of metallic iron and an iron oxide. An addition amount of the carbon-containing substance and the iron-containing substance in total is not less than 1.0 equivalents and not more than 1.5 equivalents.

First claim

1 . A method for recovering a valuable element, the method comprising reducing an oxide by adding a reductant and a flux containing CaO and SiO 2 to the oxide, followed by heating,
the oxide containing: at least one element selected from the group consisting of nickel and cobalt; and manganese, wherein the reductant contains a carbon-containing substance and an iron-containing substance, and the iron-containing substance is at least one selected from the group consisting of metallic iron and an iron oxide, and an addition amount of the carbon-containing substance and the iron-containing substance in total is not less than 1.0 equivalents and not more than 1.5 equivalents.

2 . The method for recovering a valuable element according to claim 1 , wherein an addition amount of the carbon-containing substance is 1.0 equivalents.

3 . The method for recovering a valuable element according to claim 1 , wherein the oxide further contains lithium.

4 . The method for recovering a valuable element according to claim 1 , wherein a content of the manganese in the oxide is not less than 3 mass % and not more than 12 mass %.

5 . The method for recovering a valuable element according to claim 1 , wherein a mass ratio between CaO and SiO 2 (CaO/SiO 2 ) contained in the flux is not more than 0.50.

6 . The method for recovering a valuable element according to claim 1 , wherein a temperature for heating the oxide is not lower than 1,450° C.

7 . The method for recovering a valuable element according to claim 1 , wherein the iron oxide is ferrous oxide.

8 . The method for recovering a valuable element according to claim 1 , wherein the iron-containing substance is at least one selected from the group consisting of dust, scale, sludge, and scrap.

9 . The method for recovering a valuable element according to claim 1 , wherein metal containing iron and at least one element selected from the group consisting of nickel and cobalt is obtained by reducing the oxide.

10 . The method for recovering a valuable element according to claim 1 , wherein the oxide is obtained from a lithium ion battery.

11 . A method for producing metal containing iron and at least one element selected from the group consisting of nickel and cobalt by using the method for recovering a valuable element according to claim 1 .

12 . The method for recovering a valuable element according to claim 3 , wherein a content of the manganese in the oxide is not less than 3 mass % and not more than 12 mass %.

13 . The method for recovering a valuable element according to claim 3 , wherein a mass ratio between CaO and SiO 2 (CaO/SiO 2 ) contained in the flux is not more than 0.50.

14 . The method for recovering a valuable element according to claim 3 , wherein a temperature for heating the oxide is not lower than 1,450° C.

15 . The method for recovering a valuable element according to claim 3 , wherein the iron oxide is ferrous oxide.

16 . The method for recovering a valuable element according to claim 3 , wherein the iron-containing substance is at least one selected from the group consisting of dust, scale, sludge, and scrap.

17 . The method for recovering a valuable element according to claim 3 , wherein metal containing iron and at least one element selected from the group consisting of nickel and cobalt is obtained by reducing the oxide.

18 . The method for recovering a valuable element according to claim 3 , wherein the oxide is obtained from a lithium ion battery.

19 . A method for producing metal containing iron and at least one element selected from the group consisting of nickel and cobalt by using the method for recovering a valuable element according to claim 3 .

Assignees

• Jfe Steel Corp

Inventors

• Hino Yuta
• Inoue Yotaro
• Takahashi Katsunori
• Sugimori Hiroichi
• Kasuga Takeo

Classifications

• C22B47/00

  Obtaining manganese · CPC title

• C22B26/12

  Obtaining lithium · CPC title

• C22B23/02

  by dry processes · CPC title

• C22B5/10

  by solid carbonaceous reducing agents · CPC title

• C22B5/04 Primary

  by aluminium, other metals or silicon · CPC title