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Method for processing waste lithium ion battery positive plate to extract valuable metal

A lithium-ion battery and valuable metal technology, applied in the field of resource recycling, can solve the problems of few types of organic solvents, difficulty in separating PVDF, poor operating environment, etc., and achieve the effects of not harsh equipment and materials, mature technology, and easy operation.

Active Publication Date: 2014-04-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the separation stage of aluminum membrane and active material, there are few types of organic solvents that can dissolve PVDF, the price is high, and the ability to dissolve PVDF is limited; although the solvent can be recycled, it is difficult to separate PVDF and the purification and separation cycle is short
The aluminum foil alkali dissolution method adopts strong alkali operation, which increases the acid consumption of subsequent acid dissolution, and the operating environment is poor; Al(OH) is generated 3 The particles are small and entrained with carbon powder particles and organic binder colloid, making it difficult to filter and wash; the obtained Al(OH) 3 High impurities, difficult to use
In the acid dissolution stage of the active substance, the high acidity dissolution enhanced by the reducing agent is used, and the acid needs to be neutralized by alkali. The amount of acid, alkali, and reducing agent is large, and there is a lot of waste water discharge, which puts a lot of pressure on environmental protection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The positive electrode sheet containing 10.4% aluminum (the active material is LiCoO 2 ) broken to less than 5mm, dried until the water content is less than 0.1%; add 140~150g of activated carbon to 1.0kg of flakes, and mix well.

[0063] The uniformly mixed materials are continuously and directly fed into the chlorination reaction furnace through the tubular screw feeder. The temperature is 600~650°C when the chlorination reaction is in progress; the chlorine consumption is 1.60~1.65kg based on 1.0kg of materials; the materials react (stay in the furnace) The time is 20~25min; the material is continuously discharged by the discharge screw.

[0064] The flue gas from the chlorination reaction is mixed with cold air and cooled to 190~200°C, and the superfine alumina and aluminum fluoride are collected by the cyclone dust collector; the gas is sprayed with 22~25% NaOH liquid and absorbed by the two-stage packed tower before being discharged; The absorption liquid is proc...

Embodiment 2

[0068] The positive electrode sheet containing 10.8% aluminum (the active material is the ternary material Li(Ni,Co,Mn)O 2 ) crushed to less than 5mm, dried until the water content is less than 0.1%; add 130~140g of activated carbon to 1.0kg of flakes, and mix well.

[0069] The uniformly mixed material is continuously and directly fed into the chlorination reaction furnace through the tubular screw feeder. The temperature is 450~500°C when the chlorination reaction is in progress; the amount of chlorine gas is 1.55~1.60kg based on 1.0kg of material; material reaction (residence in the furnace) The time is 35~40min; the material is continuously discharged by the discharge screw.

[0070] The flue gas from the chlorination reaction is mixed with cold air to cool down to 170~180°C, and the superfine alumina and aluminum fluoride are collected by the cyclone dust collector; the gas is sprayed with 20~22% NaOH liquid and absorbed by the two-stage packed tower before being discharg...

Embodiment 3

[0074] The positive electrode sheet containing 10.4% aluminum (the active material is LiCoO 2 ) broken to less than 5mm, dried until the water content is less than 0.1%; add 100~120g of activated carbon to 1.0kg of flakes, and mix well.

[0075] The uniformly mixed materials are continuously and directly fed into the chlorination reaction furnace through the tubular screw feeder. The temperature during the chlorination reaction is 550~600°C; the chlorine consumption is 1.50~1.55kg based on 1.0kg of materials; the materials react (stay in the furnace) The time is 30~35min; the material is continuously discharged by the discharge screw.

[0076] The flue gas from the chlorination reaction is mixed with cold air to cool down to 180~190°C, and the superfine alumina and aluminum fluoride are collected by the cyclone dust collector; the gas is sprayed with 20~22% NaOH liquid and absorbed by the two-stage packed tower before being discharged; The absorption liquid is processed and r...

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Abstract

A method for processing a waste lithium ion battery positive plate to extract valuable metal is characterized in that chlorine gas is piped in to a failure lithium ion battery positive plate under the existence of reducing agent carbon under the temperature of 450-650 DEG C to carry out chlorination processing, and a mixed product of smoke and condensed state chloride containing the valuable metal is obtained; and undissolved substances insoluble in water and valuable metal chloride solutions soluble in water are obtained through water emersion of the mixed product. The method can efficiently recover high-purification aluminum salt and other valuable metallic compounds in a short process; acid or alkaline or organic solvents are not adopted in the treatment process, and environmental management is easy.

Description

technical field [0001] The invention belongs to the field of resource recycling. In particular, it relates to a method for extracting valuable metals from lithium-ion battery cathode sheets. Background technique [0002] Lithium-ion batteries are modern advanced chemical power sources, widely used as power sources for consumer electronics, military products, aviation products, tools, and transportation products. They are also the preferred lightweight high-energy power batteries for future electric vehicles, and have a huge global market. Take mobile communication as an example. At present, there are more than 3.5 billion mobile phone users in the world, and more than 600 million users in China, and the number is increasing year by year. As a rechargeable battery, after hundreds of times of charge and discharge (generally used for 1 to 2 years), lithium-ion batteries are scrapped due to expansion, deformation, and capacity drop. Amplitude growth. [0003] Lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/08C22B3/04H01M10/54C22B23/00C22B26/12C22B47/00
CPCY02E60/12Y02P10/20Y02W30/84
Inventor 胡启阳李新海王志兴郭华军彭文杰
Owner CENT SOUTH UNIV
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