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Method for selectively extracting lithium from waste ternary positive electrode material

A cathode material and selective technology, applied in chemical instruments and methods, lithium compounds, recycling by waste collectors, etc., can solve the problems of high recycling cost, large acid and alkali consumption, etc., and achieve the effect of reducing costs

Active Publication Date: 2020-02-25
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for selectively extracting lithium from waste ternary positive electrode materials. Other impurity metal ions simplify the recycling process of waste power batteries. Considering the raw materials, the method for extracting lithium provided by the present invention not only reduces production costs, but also simplifies operations. By roasting twice and soaking in water, waste The lithium in the ternary positive electrode material is efficiently separated. Compared with the prior art, the present invention adopts a method with low cost and simple operation to extract lithium, and the recovery rate of lithium reaches more than 95%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Collect the waste nickel-cobalt lithium manganate ternary positive electrode waste, grind it into powder, mix it with oxalic acid at a mass ratio of 1:0.6, stir it evenly, put the mixture in a muffle furnace, and heat it at a temperature of 180°C After the roasting time is 60 minutes, close the muffle furnace. When the roasted product drops to room temperature, mix it with potassium oxalate at a mass ratio of 1:0.2. After mixing evenly, place it in the muffle furnace Carry out two-stage roasting, the roasting temperature is 600°C, and the roasting time is 100 minutes; after the second-stage roasting is completed, the second-stage roasted product is mixed with water at a mass ratio of 1:5, and leached at room temperature for 40 minutes. , solid-liquid separation to obtain a lithium-rich solution, the concentration of lithium ions in the lithium-rich solution reaches 20g / L, and the recovery rate of lithium ions in the waste ternary cathode material reaches 95.2%.

Embodiment 2

[0034] Collect waste nickel-cobalt lithium aluminate ternary positive electrode waste, grind it into powder, mix it with sulfuric acid at a mass ratio of 1:0.3, stir well, put the mixture in a muffle furnace, and heat it at a temperature of 230°C After the roasting time is 150 minutes, close the muffle furnace. When the roasted product drops to room temperature, mix it with ammonium sulfate at a mass ratio of 1:0.3. After mixing evenly, place it in the muffle furnace Carry out two-stage roasting, the roasting temperature is 700°C, and the roasting time is 150 minutes; after the second-stage roasting is completed, the second-stage roasted product is mixed with water at a mass ratio of 1:6, and leached at room temperature for 50 minutes. , solid-liquid separation to obtain a lithium-rich solution, the concentration of lithium ions in the lithium-rich solution reaches 22g / L, and the recovery rate of lithium ions in the waste ternary cathode material reaches 95.8%.

Embodiment 3

[0036]Collect waste nickel-cobalt lithium manganate ternary positive electrode waste, grind it into powder, mix it with sulfuric acid at a mass ratio of 1:0.4, stir evenly, and place the mixture in a muffle furnace at a temperature of 280°C Carry out a period of roasting under the hood, after the roasting time is 200min, close the muffle furnace, when the roasted product drops to room temperature, mix it with potassium sulfate at a mass ratio of 1:0.3, after mixing evenly, place it in the muffle furnace Carry out two-stage roasting, the roasting temperature is 700°C, and the roasting time is 200 minutes; after the second-stage roasting is completed, the second-stage roasted product is mixed with water at a mass ratio of 1:7, and leached at room temperature for 60 minutes. , solid-liquid separation to obtain a lithium-rich solution, the concentration of lithium ions in the lithium-rich solution reaches 20g / L, and the recovery rate of lithium ions in the waste ternary cathode mat...

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Abstract

The invention provides a method for selectively extracting lithium from a waste ternary positive electrode material, and belongs to the technical field of waste battery recovery. The lithium extraction method comprises the following steps: mixing a waste ternary positive electrode material powder with an acid, and carrying out first-stage calcination to obtain a first-stage calcination product; mixing the first-stage calcination product with an auxiliary agent, and carrying out second-stage calcination to obtain a second-stage calcination product; and putting the second-stage calcination product into water for leaching, and carrying out solid-liquid separation to obtain a lithium-rich solution. The lithium extraction method reduces the recovery cost, simplifies the technological process, and solves the problems of high acid and alkali consumption and high cost in the lithium recovery process, can efficiently separate lithium in the waste ternary positive electrode material only by theprocesses of two-stage calcination and water addition for leaching, the concentration of lithium ions in the obtained lithium-rich solution is 20-25 g / L, and the recovery rate of lithium reaches 95% or above.

Description

technical field [0001] The invention belongs to the technical field of recycling waste batteries, in particular to a method for selectively extracting lithium from waste ternary positive electrode material powder. Background technique [0002] Lithium-ion batteries have the characteristics of high voltage, large specific capacity, long cycle life, and good safety performance. They can be widely used in smartphones, tablet computers, electric vehicles, and automotive power plants. In recent years, with the development of new energy sources for vehicles, the lithium-ion battery industry for new energy vehicles has also developed rapidly. However, power batteries in new energy vehicles are consumables and have a certain service life; as for the service life of power lithium-ion batteries, the power batteries of new energy vehicles for operation are 3 to 5 years, while the power batteries of private passenger cars 5 to 8 years. According to relevant reports, with the vigorous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00H01M10/54
CPCC01D15/00H01M10/54Y02W30/84
Inventor 周有池文小强郭春平刘雯雯赖华生周新华普建王玉香张帆陈燕飞肖颖奕
Owner GANZHOU NONFERROUS METALLURGICAL RES INST