# US 12,763,390 B2 · Method for recovering aluminum residue with controlled particle size, and use thereof

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- Number: US 12,763,390 B2
- Document ID: US12763390B2
- Status: Granted
- Kind: B2
- Application number: 18/373,950
- Filed: 2023-09-27
- Published: 2024-01-18
- Granted: 2026-10-13
- Earliest claimed: 2021-04-07
- Assignees: Guangdong Brunp Recycling Technology Co., Ltd.; Hunan Brunp Recycling Technology Co., Ltd.; Hunan Brunp Recycling Co., Ltd.
- Applicants: Guangdong Brunp Recycling Technology Co., Ltd.; Hunan Brunp Recycling Technology Co., Ltd.; Hunan Brunp Ev Recycling Co., Ltd.
- Inventors: Haijun Yu; Yingsheng Zhong; Yinghao Xie; Changdong Li; Xuemei Zhang
- Web page: https://patentgrep.com/patent/US12763390B2

## CPC

- H01M 10/54: Reclaiming serviceable parts of waste accumulators
- C22B 1/02: Roasting processes (C22B1/16 takes precedence)
- C22B 1/24: Binding; Briquetting {; Granulating}
- C22B 7/008: {by an alkaline or ammoniacal leaching}
- C22B 21/0023: {from waste materials}
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS

## Abstract

The present disclosure belongs to the technical field of battery recycling, and discloses a method for recovering an aluminum residue with a controlled particle size, and use thereof. The method includes the following steps: crushing and sieving a positive electrode sheet of a waste power battery, then, crushing at −198° C. to −196° C. with addition of liquid nitrogen to obtain a granular material; roasting, cooling, and grinding the granular material, adding water, shaking, settling into layers, and separating the layers to obtain a positive electrode active powder layer, a transition layer, and an aluminum residue particle layer; and shaking the aluminum residue particle layer and the transition layer for a second time, settling into layers, and collecting aluminum residue particles and a positive electrode active powder.

## Claims

### Claim 1

A method for recovering an aluminum residue with a controlled particle size, comprising the following steps:
step 1, crushing and sieving a positive electrode sheet of a waste power battery, then, crushing at −198° C. to −196° C. with addition of liquid nitrogen to obtain a granular material;
step 2, roasting the granular material, collecting a gaseous binder produced from the roasting with an alkaline solution, cooling, and grinding a residue to obtain a waste positive electrode sheet powder;
step 3, adding water to the waste positive electrode sheet powder, shaking, settling into layers, and separating the layers to obtain a positive electrode active powder layer, a transition layer, and an aluminum residue particle layer; and
step 4, shaking the aluminum residue particle layer and the transition layer for a second time, settling into layers, and collecting aluminum residue particles and a positive electrode active powder,
in step 1, the granular material has a particle size of 0.01 μm to 500 μm;
in step 2, the gaseous binder is polyvinylidene fluoride (PVDF) or polytetrafluoroethylene (PTFE);
in step 2, a grinder used in the grinding has a treatment capacity of <100 kg/h and a rotational speed of 120 rpm to 180 rpm;
in steps 3 and 4, during shaking, the waste positive electrode sheet powder are kept immersed in water in a container; and the water is deionized water;
steps 3 and 4 are repeated 1 to 10 times until the aluminum residue particles and the positive electrode active powder in the particles are completely separated and collected.

### Claim 2 (depends on 1)

The method according to claim 1, wherein in step 1, the liquid nitrogen is added at an amount of 5% to 30% of a mass of the positive electrode sheet of the waste power battery.

### Claim 3 (depends on 1)

The method according to claim 1, wherein in step 2, the roasting is conducted in an inert gas atmosphere; and an inert gas of the inert gas atmosphere is one from the group consisting of He, Ne, and Ar.

### Claim 4 (depends on 1)

The method according to claim 1, wherein in step 2, the roasting is conducted at 350° C. to 500° C. for 30 min to 60 min.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the alkaline solution is at least one from the group consisting of Mg(OH)2, NaOH, and Ca(OH)2.

### Claim 6 (depends on 1)

The method according to claim 1, wherein in steps 3 and 4, a shaker used in the shaking has a shaking frequency of 5 Hz to 20 Hz and a shaking amplitude of 0.5 cm to 2 cm, and the shaking is conducted for 5 min to 10 min.