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Recycling method for controlling granularity of aluminum slag and application of recycling method

A recycling method, aluminum slag technology, applied in recycling technology, battery recycling, recycling by waste collectors, etc., can solve problems such as difficulty in recycling

Active Publication Date: 2021-08-13
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]Currently, the recycling and treatment of waste from the positive electrode sheet of batteries mainly includes a series of operations such as coarse crushing, physical screening, and fine crushing of the discarded positive electrode sheet to obtain the waste positive electrode sheet. Particulate matter, the waste positive electrode granular matter is subsequently subjected to acid and alkali dissolution extraction and recovery of valuable metals, but the waste positive electrode particles contain a low amount of aluminum slag particles and other impurity particles, and the particle size of the impurities is small, which is different from the waste The positive electrode active material, binder and other particles are mixed together, making recycling difficult

Method used

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  • Recycling method for controlling granularity of aluminum slag and application of recycling method
  • Recycling method for controlling granularity of aluminum slag and application of recycling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A recovery method for controlling the particle size of aluminum slag, comprising the following specific steps:

[0036] (1) Preparation of waste positive electrode pellets: recycle waste positive electrode sheets in the production process of power batteries, mechanically crush them, sieve them, and add 9% liquid nitrogen for fine grinding to obtain waste positive electrode sheets with a particle size of 0.01-500 μm containing impurities particles;

[0037] (2) Roasting: Put 113kg of spent positive electrode pellets in a resistance furnace for roasting. The resistance furnace is filled with He, and the temperature of the resistance furnace is raised. The temperature of the resistance furnace is controlled at 360°C, and it is roasted stably for 55 minutes. During this period, the heating rate of the resistance furnace is Control at 15°C / min, pass the gas produced by roasting through Ca(OH) 2 Alkaline solution, for collection;

[0038] (3) Cooling and grinding: On the ba...

Embodiment 2

[0043] A recovery method for controlling the particle size of aluminum slag, comprising the following specific steps:

[0044] (1) Preparation of waste positive electrode pellets: recycle waste positive electrode sheets in the production process of power batteries, coarsely pulverize them mechanically, sieve them, and add 15% liquid nitrogen for fine pulverization to obtain particles with a particle size of 0.01-500 μm;

[0045] (2) Roasting: put 261kg of particles in a resistance furnace for roasting, fill the resistance furnace with He, increase the temperature of the resistance furnace, control the temperature of the resistance furnace at 420 ° C, and stably roast for 40 minutes, during which the heating rate of the resistance furnace is controlled at 15 °C / min, the gas produced by roasting is collected through Ca(OH)2 alkali solution;

[0046] (3) Cooling and grinding: On the basis of step (2), the waste positive electrode particles in the heating furnace are lowered to ro...

Embodiment 3

[0051] A recovery method for controlling the particle size of aluminum slag, comprising the following specific steps:

[0052] (1) Preparation of waste positive electrode pellets: recycle waste positive electrode sheets in the production process of power batteries, coarsely pulverize them mechanically, sieve them, and add 22% liquid nitrogen for fine pulverization to obtain particles with a particle size of 0.01-500 μm;

[0053] (2) Roasting: put 387kg of particles in a resistance furnace for roasting, fill the resistance furnace with He, increase the temperature of the resistance furnace, control the temperature of the resistance furnace at 460 ° C, and stably roast for 35 minutes, during which the heating rate of the resistance furnace is controlled at 18 ℃ / min, pass the gas generated by roasting through Mg(OH) 2 alkaline solution collection;

[0054] (3) Cooling and grinding: On the basis of step (2), the waste positive electrode particles in the heating furnace are lowere...

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Abstract

The invention belongs to the technical field of battery recycling, and discloses a recycling method for controlling the granularity of aluminum slag and application of the recycling method. The recycling method comprises the following steps: smashing and screening a waste power battery positive plate, and adding liquid nitrogen for smashing to obtain particles; carrying out roasting, cooling, grinding, water adding, oscillating and layering on the particles to obtain an aluminum slag particle layer, a transition layer and a positive active powder layer; and carrying out secondary oscillation and layering on the aluminum slag particle layer and the transition layer to obtain aluminum slag particles and positive electrode active powder. When liquid nitrogen is added for low-temperature fine crushing, the bonding performance of a binder is reduced, a positive active material and the binder are in an embrittlement state and are easy to crush, the aluminum slag still has certain toughness, and selective crushing is realized at low temperature due to the difference of embrittlement temperatures of different materials; and the granularity of the crushed positive active particles, the granularity of the binder particles and the granularity of the aluminum slag particles are narrower, so that conditions are created for subsequent separation and recovery.

Description

technical field [0001] The invention belongs to the technical field of battery recycling, and in particular relates to a recycling method for controlling the granularity of aluminum slag and an application thereof. Background technique [0002] The battery positive electrode scraps contain aluminum-based current collectors, lithium iron phosphate (LiFePO 4 ) and lithium nickel cobalt manganese oxide (LiNi x co y mn 1-x-y o 2 ) (where x+y=1, 0<x<1, 0<y<1) and other active materials, binders, conductive agents and other components, wherein the metals with potential recycling value are Ni , Mn, Co, Li, Al, etc. [0003] At present, the recycling and treatment of battery positive electrode scraps mainly include a series of operations such as coarse crushing, physical sieving, and fine crushing of the discarded positive electrode sheet to obtain the particulate matter of the discarded positive electrode sheet, which is subsequently dissolved by acid and alkali. ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B21/00C22B1/02H01M10/54
CPCC22B21/0007C22B21/0023C22B7/005C22B1/02C22B7/008H01M10/54Y02W30/84Y02P10/20H01M4/131H01M4/661C22B1/005C22B1/24
Inventor 余海军钟应声谢英豪李长东张学梅
Owner GUANGDONG BRUNP RECYCLING TECH