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A method and system for recovering lithium and cobalt from waste lithium cobalt oxide batteries

A technology for old lithium cobaltate and lithium recovery, applied in battery recycling, waste collector recycling, recycling technology, etc., can solve the problems of bacterial culture, harsh use conditions, complex ion exchange operation, and high cost of organic solvent stripping. Achieve the effect of eliminating the use of organic extractants, high product purity, and easy control of process conditions

Active Publication Date: 2020-09-04
青海中科德方能源科技研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method uses organic solvent stripping, although the stripping effect is better, but the cost of organic solvent stripping is high, the efficiency is low, and the organic matter is volatile, which is easy to cause environmental pollution, which restricts the large-scale application
[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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  • A method and system for recovering lithium and cobalt from waste lithium cobalt oxide batteries
  • A method and system for recovering lithium and cobalt from waste lithium cobalt oxide batteries
  • A method and system for recovering lithium and cobalt from waste lithium cobalt oxide batteries

Examples

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Effect test

Embodiment 1

[0087] A certain type of waste lithium cobalt oxide battery is used as raw material. Firstly, the waste batteries are discharged, disassembled, and screened to obtain positive electrode materials. Weigh 800g of lithium cobaltate positive electrode material and treat it in a muffle furnace at 450°C for 2h, then remove the binder, quench it with water and process it in ultrasonic vibration for 30min, 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 4mol / L sulfuric acid, and 30% hydrogen peroxide was added at the same time, the solid-liquid ratio was controlled to 80g / 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...

Embodiment 2

[0095] A certain type of waste lithium cobalt oxide battery is used as raw material. Firstly, the waste batteries are discharged, disassembled, and screened to obtain positive electrode materials. Weigh 600g of lithium cobalt oxide positive electrode material and treat it in a muffle furnace at 650°C for 2 hours, then remove the binder, quench it with water and process it in ultrasonic vibration for 30 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 10mol / L sulfuric acid, and 30% hydrogen peroxide was added at the same time, the solid-liquid ratio was controlled to 80g / L, the temperature was controlled at 30°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

[0103] A certain type of waste lithium cobalt oxide battery is used as raw material. Firstly, the waste batteries are discharged, disassembled, and screened to obtain positive electrode materials. Weigh 1000g of lithium cobalt oxide positive electrode material and treat it in a muffle furnace at 500°C for 1 hour, remove the binder, quench it with water, and process it in ultrasonic vibration for 60 minutes to peel off the positive electrode material and aluminum foil. 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 4mol / L sulfuric acid, and 30% hydrogen peroxide was added at the same time to control the solid-liquid ratio to 75g / L, and the temperature was controlled at 85°C and kept stirring for 4 hours, and then filtered to obtain the leaching solution of valuable metals. The acid leaching residue is mainly acid-insoluble matte...

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Abstract

The invention discloses a method and a system for recovering lithium and cobalt from waste lithium cobalt oxide batteries. The method comprises the following steps of: disassembling a positive electrode sheet from a waste lithium cobalt oxide battery; Removing the binder in the positive electrode sheet, and then acid leaching the valuable metal elements in the positive electrode sheet to obtain anacidizing leaching solution; The acidified leachate was treated by ultrafiltration membrane. Separating lithium ions in acidified leaching solution from other cations different from lithium ions by using nanofiltration membrane technology to obtain lithium-containing solution and solution containing other cations, and concentrating and enriching the lithium-containing solution and the solution containing other cations respectively by reverse osmosis technology, wherein the other cations include cobalt ions; And a lithium precipitant is used to precipitate lithium ions from a lithium-containing solution, and an alkaline substance is used to precipitate cobalt ions from a solution containing other cations, thereby realizing the recovery of lithium and cobalt. The adoption of ultrafiltration-Nanofiltration-Reverse osmosis combined technology has the characteristics of simple process, less acid and alkali consumption, good and stable membrane separation effect and so on.

Description

technical field [0001] The invention relates to a method for recovering lithium and cobalt from waste lithium cobalt oxide 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. Pure electric vehicle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C22B26/12C22B7/00C22B3/00
CPCC22B7/007C22B23/0407C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 彭正军王敏祝增虎王怀有赵有璟贾国凤李积升
Owner 青海中科德方能源科技研究有限公司
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