Method for treating sulfide

Patent metadata

Field	Value
Publication number	US-2023295766-A1
Application number	US-202118020439-A
Country	US
Kind code	A1
Filing date	Aug 5, 2021
Priority date	Aug 17, 2020
Publication date	Sep 21, 2023
Grant date	—

Abstract

Provided is a method for treating a sulfide, the method being suitable for obtaining nickel and/or cobalt from a sulfide containing copper and nickel and/or cobalt. The method relates to a method for treating a sulfide containing copper and nickel and/or cobalt, the method including pulverizing the sulfide by subjecting the sulfide to a pulverizing treatment so as to obtain a pulverized sulfide having a particle size of 800 μm or less; and leaching the pulverized sulfide by subjecting the pulverized sulfide to a leaching treatment with an acid under a condition in which a sulfurizing agent is present to obtain a leachate. For example, the sulfide to be treated is generated by reducing, heating, and melting a waste lithium-ion battery to obtain a molten body and adding a sulfurizing agent to the molten body to sulfurize the molten body.

First claim

1 . A method for treating a sulfide comprising copper and nickel and/or cobalt, the method comprising:
pulverizing the sulfide by subjecting the sulfide to a pulverizing treatment to obtain a pulverized sulfide having a particle size of 800 μm or less; and leaching the pulverized sulfide by subjecting the pulverized sulfide to a leaching treatment with an acid under a condition in which a sulfurizing agent is present, to obtain a leachate.

2 . The method for treating a sulfide according to claim 1 , wherein, in the leaching step, a leaching treatment is performed with at least one or more types selected from sulfuric acid, hydrochloric acid, and nitric acid to obtain a leachate.

3 . The method for treating a sulfide according to claim 1 , further comprising reducing the leachate by using a metal that has a lower standard reduction potential than copper.

4 . The method for treating a sulfide according to claim 3 , further comprising oxidizing and neutralizing a solution obtained in the reduction step by adding an oxidant and a neutralizing agent to the solution obtained in the reduction step, to obtain a solution containing nickel and/or cobalt.

5 . The method for treating a sulfide according to claim 4 , wherein the oxidant is one or more types selected from hydrogen peroxide and hypochlorous acid.

6 . The method for treating a sulfide according to claim 4 , wherein the neutralizing agent is one or more types selected from sodium hydroxide and potassium hydroxide.

7 . The method for treating a sulfide according to claim 1 , wherein the sulfide is generated by adding a sulfurizing agent to a molten body obtained by reducing, heating, and melting a waste lithium-ion battery.

8 . A method for recovering a valuable metal from a waste lithium-ion battery,
the method comprising obtaining a leachate by leaching a sulfide comprising copper and nickel and/or cobalt with an acid, the sulfide being generated by sulfurizing a molten body obtained by reducing, heating, and melting the waste lithium-ion battery, wherein the sulfide is subjected to a pulverizing treatment so as to have a particle size of 800 μm or less and the pulverized sulfide is subjected to a leaching treatment with an acid under a condition in which a sulfurizing agent is present.

9 . A method for recovering a valuable metal from a waste lithium-ion battery,
the method comprising a pyrometallurgical treatment, in which the waste lithium-ion battery is reduced, heated, and melted to obtain a molten body, and sulfurizing the molten body to obtain a sulfide containing copper and nickel and/or cobalt, and a hydrometallurgical treatment, in which the sulfide is leached with an acid, wherein, in the hydrometallurgical treatment, the sulfide is pulverized so as to have a particle size of 800 μm or less, and the pulverized sulfide is subjected to a leaching treatment with an acid under a condition in which a sulfurizing agent is present.

10 . The method for treating a sulfide according to claim 2 , further comprising reducing the leachate by using a metal that has a lower standard reduction potential than copper.

11 . The method for treating a sulfide according to claim 5 , wherein the neutralizing agent is one or more types selected from sodium hydroxide and potassium hydroxide.

12 . The method for treating a sulfide according to claim 2 , wherein the sulfide is generated by adding a sulfurizing agent to a molten body obtained by reducing, heating, and melting a waste lithium-ion battery.

13 . The method for treating a sulfide according to claim 3 , wherein the sulfide is generated by adding a sulfurizing agent to a molten body obtained by reducing, heating, and melting a waste lithium-ion battery.

14 . The method for treating a sulfide according to claim 4 , wherein the sulfide is generated by adding a sulfurizing agent to a molten body obtained by reducing, heating, and melting a waste lithium-ion battery.

15 . The method for treating a sulfide according to claim 5 , wherein the sulfide is generated by adding a sulfurizing agent to a molten body obtained by reducing, heating, and melting a waste lithium-ion battery.

16 . The method for treating a sulfide according to claim 6 , wherein the sulfide is generated by adding a sulfurizing agent to a molten body obtained by reducing, heating, and melting a waste lithium-ion battery.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Takenouchi Hiroshi
• HEGURI Shin-ichi
• Asano Satoshi
• Shouji Hirofumi

Classifications

• C22B15/0071

  containing sulfur · CPC title

• B09B3/70 Primary

  Chemical treatment, e.g. pH adjustment or oxidation (involving an extraction step B09B3/80) · CPC title

• C22B3/10 Primary

  Hydrochloric acid {, other halogenated acids or salts thereof} · CPC title

• H01M10/54

  Reclaiming serviceable parts of waste accumulators · CPC title

• Y02P10/20

  Recycling · CPC title