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Method and system for recovering lithium from waste lithium iron phosphate battery

A lithium iron phosphate battery and lithium recovery technology, applied in the field of lithium recovery, can solve the problems of bacterial culture, harsh use conditions, complicated ion exchange operation, multi-alkali leaching residue and acid leaching solution, etc. High product purity and the effect of reducing the amount of acid and alkali used

Active Publication Date: 2019-01-15
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The lithium yield of this invention has reached 94%, but it produces more alkali leaching residue and acid leaching solution, which brings environmental risks, and the product is lithium phosphate, with relatively low economic value
[0006] Other methods such as ion exchange method, sulfide bacteria leaching, etc. have successfully recovered valuable metal elements, but these methods have certain limitations, such as ion exchange method is more complicated to operate, the steps are more cumbersome, and it is only suitable for the separation and purification of a small amount of ions ; Bacteria culture, harsh conditions of use, and difficulty in industrialization of sulfide bacteria leaching technology have restricted the application and promotion of the technology

Method used

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  • Method and system for recovering lithium from waste lithium iron phosphate battery
  • Method and system for recovering lithium from waste lithium iron phosphate battery
  • Method and system for recovering lithium from waste lithium iron phosphate battery

Examples

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Effect test

Embodiment 1

[0085] A certain type of waste lithium iron phosphate battery is used as raw material. Firstly, the waste batteries are discharged, disassembled, and screened to obtain positive electrode materials. Weigh 600g of lithium iron phosphate cathode material and treat it in a muffle furnace at 400°C for 2h, then remove the binder, quench it with water and treat it in ultrasonic vibration for 60min, so that the cathode material and aluminum foil are peeled off. The large mesh screen is used to remove and separate the aluminum foil, and the aluminum foil can be directly used for aluminum smelting after washing. The obtained black fine slag was treated with 2mol / L sulfuric acid, and 30% hydrogen peroxide was added at the same time, the solid-liquid ratio was controlled to 100g / L, the temperature was controlled at 80°C, and the leaching solution of valuable metals was obtained by filtration. The acid leaching residue is mainly acid-insoluble matter such as carbon powder. After testing...

Embodiment 2

[0093] A certain type of waste lithium iron phosphate battery is used as raw material. Firstly, the waste batteries are discharged, disassembled, and screened to obtain positive electrode materials. Weigh 800g of lithium iron phosphate positive electrode material and treat it in a muffle furnace at 450°C for 2 hours, remove the binder, quench it with water and process it in ultrasonic vibration for 60 minutes, so that the positive electrode material and aluminum foil are peeled off. The large mesh screen is used to remove and separate the aluminum foil, and the aluminum foil can be directly used for aluminum smelting after washing. The obtained black fine slag was treated with 3mol / L sulfuric acid, and 30% hydrogen peroxide was added at the same time, the solid-liquid ratio was controlled to 100g / L, the temperature was controlled at 80°C, and the leaching solution of valuable metals was obtained by filtration. The acid leaching residue is mainly acid-insoluble matter such as ...

Embodiment 3

[0101] A certain type of waste lithium iron phosphate battery is used as raw material. Firstly, the waste batteries are discharged, disassembled, and screened to obtain positive electrode materials. Weigh 900g of lithium iron phosphate cathode material and treat it in a muffle furnace at 500°C for 2h, then remove the binder, quench it with water and treat it in ultrasonic vibration for 60min, so that the cathode material and the aluminum foil are peeled off. The large mesh screen is used to remove and separate the aluminum foil, and the aluminum foil can be directly used for aluminum smelting after washing. The obtained black fine slag was treated with 8mol / L sulfuric acid, and 30% hydrogen peroxide was added at the same time, the solid-liquid ratio was controlled to 100g / L, the temperature was controlled at 80°C, and the leaching solution of valuable metals was obtained by filtration. The acid leaching residue is mainly acid-insoluble matter such as carbon powder. After tes...

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Abstract

The invention discloses a method and system for recovering lithium from a waste lithium iron phosphate battery. The method comprises the following steps that a positive plate is disassembled from thewaste lithium iron phosphate battery; a binder in the positive plate is removed, valuable metal elements in the positive plate are leached by an acid solution, and an acidified leaching solution is obtained; ultrafiltration treatment is carried out on the acidified leachate by using an ultrafiltration membrane; by using a nanofiltration membrane technology, lithium ions in the acidified leachate are separated from other cations different from lithium ions, a solution containing lithium and a solution containing other cations are obtained, and then a reverse osmosis technology is adopted for concentration and enrichment correspondingly, wherein the other cations comprise iron ions; and a lithium precipitant is adopted to precipitate and separate lithium ions in the lithium-containing solution, alkaline substances are adopted to precipitate and separate iron ions in the solution containing other cations, and lithium recovery is realized. According to the method and system, the ultrafiltration-nanofiltration-reverse-osmosis combined technology is adopted, and the method and system have the beneficial effects of simple process, environmental protection, less acid and alkali consumption, good and stable membrane separation effect and the like.

Description

technical field [0001] The invention relates to a method for recovering lithium from waste lithium iron phosphate batteries and a corresponding system, belonging to the technical field of lithium battery recovery. Background technique [0002] Lithium and its compounds are strategic materials of great significance in the national economy and national defense construction, and are also new green energy materials closely related to people's lives. As a new type of chemical power source, lithium-ion battery has become the main energy source of 3C electronic products, accounting for more than 80% of the consumer electronics market. In recent years, the continuous progress of lithium battery technology and the improvement of energy density have greatly increased the demand in the fields of new energy vehicles and energy storage power supplies, which has led to a substantial increase in the production and sales of lithium-ion batteries year-on-year. In recent years, the continuou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/12H01M10/54
CPCC22B7/007C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 彭正军王敏祝增虎王怀有赵有璟贾国凤李积升
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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