Method for recycling iron and aluminum in nickel-cobalt-manganese solution

Patent metadata

Field	Value
Publication number	US-11760655-B2
Application number	US-202118043027-A
Country	US
Kind code	B2
Filing date	Aug 3, 2021
Priority date	Aug 25, 2020
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

The present invention relates to a method for recycling iron and aluminum in a nickel-cobalt-manganese solution. The method comprises the following steps: leaching a battery powder and removing copper therefrom to obtain a copper-removed solution, and adjusting the pH value in stages to remove iron and aluminum, so as to obtain a goethite slag and an iron-aluminum slag separately; mixing the iron-aluminum slag with an alkali liquor, and heating and stirring same to obtain an aluminum-containing solution and alkaline slag; and heating and stirring the aluminum-containing solution, introducing carbon dioxide thereto and controlling the pH value to obtain aluminum hydroxide and an aluminum-removed solution.

First claim

The invention claimed is:

1. A method for recycling iron and aluminum from a nickel-cobalt-manganese solution, comprising the following steps:
performing leaching and copper removal on a battery powder to obtain a copper-removed solution, and removing iron and aluminum by adjusting a pH value in stages to obtain a goethite slag and an iron-aluminum slag respectively; wherein the removing iron and aluminum by adjusting a pH value in stages comprises: adding a neutralizer, controlling the pH value to 2-4, and heating for a reaction, to obtain the goethite slag; and adding a neutralizer, adjusting the pH value to 4-5, and heating for a reaction, to obtain the iron-aluminum slag and an iron-removed solution; wherein the goethite slag is washed and dried to obtain a goethite product;
mixing the iron-aluminum slag with an alkaline solution, and heating and stirring, to obtain an aluminum-containing solution and an alkaline residue; and
heating and stirring the aluminum-containing solution, introducing carbon dioxide, and controlling the pH value to 9.5-11.5, ending the reaction when the pH value is stable, to obtain aluminum hydroxide and an aluminum-removed solution;
wherein after the aluminum-containing solution and the alkaline residue are obtained, the method further comprises: returning the alkaline residue to an acid leaching procedure; and the aluminum-removed solution is used as the neutralizer and returned to a system for removing iron and aluminum in stages.

2. The method according to claim 1 , wherein the neutralizer comprises one or more of sodium carbonate, potassium carbonate, calcium carbonate, calcium hydroxide, or magnesium hydroxide.

3. The method according to claim 1 , wherein the pH value is controlled to 2-4, a reaction temperature is 70-95° C., a reaction time is 1-4 h, the reaction is ended when the pH value is stable, and the goethite slag is obtained.

4. The method according to claim 1 , wherein the pH value is adjusted to 4-5, a reaction temperature is 60-95° C., a reaction time is 2-4 h, and the iron-aluminum slag and the iron-removed solution are obtained.

5. The method according to claim 1 , wherein the alkaline solution is a solution comprising at least one of sodium hydroxide or potassium hydroxide.

6. The method according to claim 1 , wherein the iron-aluminum slag and the alkaline solution are mixed at a caustic ratio of 2.5-7.5.

7. The method according to claim 1 , wherein a rate of introducing carbon dioxide is 2-8 L/min.

Assignees

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

Inventors

• Deng Haozhen
• Kan Zhixin
• Chen Ruokui
• Ruan Dingshan
• He Fang
• Li Changdong

Classifications

• C22B7/007 Primary

  by acid leaching · CPC title

• C22B21/0023 Primary

  from waste materials · CPC title

• C22B47/00 Primary

  Obtaining manganese · CPC title

• C01G49/02 Primary

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

• C22B23/043

  Sulfurated acids or salts thereof · CPC title