Method for recovering nickel from iron-aluminum slag obtained by battery powder leaching

Patent metadata

Field	Value
Publication number	US-2024124953-A1
Application number	US-202218555257-A
Country	US
Kind code	A1
Filing date	May 12, 2022
Priority date	Aug 31, 2021
Publication date	Apr 18, 2024
Grant date	—

Abstract

Disclosed in the present invention is a method for recovering nickel from iron-aluminum slag obtained by battery powder leaching. The method comprises the following steps: adding a sulfuric acid solution into an iron-aluminum slag to dissolve, so as to obtain a sulfate solution; then adding an oxidizing agent; adding ammonia water and carbonate into the oxidized sulfate solution; adjusting the pH to 1.0-3.2 for reaction; separating ferric hydroxide to precipitate to obtain an iron-removed solution; adding carbonate into the iron-removed solution, adjusting the pH to 3.2-5.5 for reaction; separating aluminum hydroxide to precipitate to obtain an aluminum-removed solution; adding ammonia water to the aluminum-removed solution, adjusting the pH to 7.0-8.8 for reaction; washing and removing impurities to obtain a nickel complex; adding an oxidizing agent to the nickel complex to break the complex, so as to obtain a nickel-containing solution. By means of the present method, efficient separation of iron, aluminum and nickel in the iron-aluminum slag is efficiently achieved, the separation effect of iron, aluminum and nickel is improved, the loss of nickel is reduced, and the recovery rate of nickel is improved.

First claim

1 . A method for recovering nickel from iron-aluminum residue obtained by leaching battery powder, comprising the following steps:
S1: adding sulfuric acid solution to the iron-aluminum residue for dissolving the same to obtain a sulfate solution, then adding an oxidizing agent; S2: adding ammonia water and carbonate to oxidized sulfate solution, adjusting pH to 1.0-3.2 for reaction, and separating iron hydroxide precipitate to obtain iron-removed liquid; S3: adding carbonate to the iron-removed liquid, adjusting pH to 3.2-5.5 for reaction, and separating aluminum hydroxide precipitate to obtain aluminum-removed liquid; S4: adding ammonia water to the aluminum-removed liquid, adjusting pH to 7.0-8.8 for reaction, and obtaining nickel complex after washing and removing impurities; S5: adding an oxidizing agent to the nickel complex to break complexation to obtain nickel-containing solution.

2 . The method according to claim 1 , wherein in step S1, the oxidizing agent is hydrogen peroxide; preferably, the volume ratio of the sulfate solution to the hydrogen peroxide is 1:
(0.01-0.5), and the mass fraction of the hydrogen peroxide is 1-35%.

3 . The method according to claim 1 , wherein in step S2, molar ratio of Fe 3+ and CO 3 2− in reaction system is 1:(1-8).

4 . The method according to claim 1 , wherein in step S2, ratio of molar amount of nickel element to NH 3 in reaction system is 1:(1-10).

5 . The method according to claim 1 , wherein in step S3, molar ratio of Al 3+ and CO 3 2− in reaction system is 10:(5-50).

6 . The method according to claim 1 , wherein in step S4, ratio of molar amount of nickel element to NH 3 in reaction system is 1:(4-20).

7 . The method according to claim 1 , wherein in step S2 and/or step S4, the concentration of the ammonia water is 0.1-5 mol/L.

8 . The method according to claim 1 , wherein in step S2 and/or step S3, the carbonate is one or more of ammonium carbonate, sodium carbonate or sodium bicarbonate; preferably, the concentration of the carbonate is 0.01-5 mol/L.

9 . The method according to claim 1 , wherein in step S5, the oxidizing agent is one or two of hydrogen peroxide or sodium hypochlorite.

10 . The method according to claim 1 , wherein in step S5, the nickel complex is further subjected to ultraviolet light treatment when the complexation is broken.

Assignees

• Guangdong Brunp Recycling Technology Co Ltd
• Hunan Brunp Recycling Tech Co Ltd
• Hunan Brunp Ev Recycling Co Ltd

Inventors

• Yu Haijun
• Zhong Yingsheng
• Li Aixia
• Xie Yinghao
• Zhang Xuemei
• Li Changdong

Classifications

• Y02W30/84

  Recycling of batteries or fuel cells · CPC title

• Y02P10/20

  Recycling · CPC title

• H01M10/54

  Reclaiming serviceable parts of waste accumulators · CPC title

• C22B23/0461 Primary

  by chemical methods · CPC title

• C22B21/0023

  from waste materials · CPC title