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Method for recovering lithium in ternary positive electrode material by microwave roasting

A positive electrode material and microwave roasting technology, which is applied in the field of lithium battery material recycling, can solve the problems of high cost and inconvenient operation, and achieve the effects of increasing the leaching rate, speeding up the water immersion process, and shortening the roasting time

Active Publication Date: 2020-02-21
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding potassium hydroxide in this method will cause a small explosion, and the amount of sodium hydroxide / potassium hydroxide added is large, the cost is high, and the operation is inconvenient

Method used

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  • Method for recovering lithium in ternary positive electrode material by microwave roasting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] After mixing the waste and old ternary positive electrode material with dilute hydrochloric acid, then uniformly mix it with sodium chloride to obtain a mixture; wherein the mass concentration of dilute hydrochloric acid is 18%, and the consumption is 30% of the quality of the waste and old ternary positive electrode material, and the consumption of sodium chloride is 10% of the mass of waste ternary cathode materials;

[0036] Put the mixture into a microwave sintering furnace for roasting to obtain a roasted product; the microwave power is 2.0kW, the roasting temperature is 400°C, and the roasting time is 40 minutes;

[0037]Carry out ball mill water immersion to the roasted product, the solid-liquid ratio of ball mill water immersion is 1:2, the ball mill speed is 200 rpm, the ball mill time is 60min, the lithium in the mixture enters the water to obtain lithium chloride solution, obtains lithium chloride solution through filtration The recovery rate of lithium in th...

Embodiment 2

[0040] After mixing the waste and old ternary positive electrode material with dilute hydrochloric acid, mix it evenly with sodium chloride to obtain a mixture; wherein the mass concentration of dilute hydrochloric acid is 18%, and the consumption is 30% of the quality of the waste and old ternary positive electrode material, and the consumption of sodium chloride is 10% of the mass of waste ternary cathode materials;

[0041] Put the mixture into a microwave sintering furnace for roasting to obtain a roasted product; the microwave power is 2.5kW, the roasting temperature is 500°C, and the roasting time is 30 minutes;

[0042] Carry out ball mill water immersion to the roasted product, the solid-liquid ratio of ball mill water immersion is 1:3, the ball mill speed is 400 rpm, the ball mill time is 30min, the lithium in the mixture enters the water to obtain lithium chloride solution, obtains aluminum chloride solution through filtration . The recovery rate of lithium in the w...

Embodiment 3

[0045] After mixing the waste and old ternary positive electrode material with dilute hydrochloric acid, mix it evenly with sodium chloride to obtain a mixture; wherein the mass concentration of dilute hydrochloric acid is 18%, and the consumption is 30% of the quality of the waste and old ternary positive electrode material, and the consumption of sodium chloride is 10% of the mass of waste ternary cathode materials;

[0046] Put the mixture into a microwave sintering furnace for roasting to obtain a roasted product; the microwave power is 2.8kW, the roasting temperature is 600°C, and the roasting time is 30 minutes;

[0047] Carry out ball mill water immersion to the roasted product, the solid-liquid ratio of ball mill water immersion is 1:5, the ball mill speed is 600 rpm, the ball mill time is 40min, the lithium in the mixture enters the water to obtain lithium chloride solution, obtains lithium chloride solution through filtration . The recovery rate of lithium in the wa...

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Abstract

The invention relates to the technical field of lithium battery material recovery, and provides a method for recovering lithium in a ternary positive electrode material by microwave roasting, whereinthe method comprises the steps: mixing a waste ternary positive electrode material, diluted hydrochloric acid and an assistant, carrying out microwave roasting, carrying out ball milling and water leaching on the roasted product to obtain a lithium chloride solution, concentrating, crystallizing, carrying out solid-liquid separation, and drying to obtain lithium chloride. According to the method provided by the invention, conventional roasting is replaced with microwave roasting, materials are heated from inside to outside through microwaves, the roasting temperature is reduced, and the roasting time is shortened; ball-milling water leaching is adopted to replace crushing and water leaching or crushing and acid leaching in a traditional method, the water leaching process is accelerated through ball-milling water leaching, the leaching rate is increased, leachate hardly contains other high-valence metal ions, and lithium chloride can be directly prepared without purification and impurity removal.

Description

technical field [0001] The invention relates to the technical field of recycling lithium battery materials, in particular to a method for recovering lithium in a ternary positive electrode material by microwave roasting. Background technique [0002] Lithium battery ternary cathode materials include nickel-cobalt lithium manganese oxide or nickel-cobalt aluminate lithium, which is the most widely used cathode material in lithium batteries. Batteries with ternary materials as cathodes are safer than lithium cobalt oxide batteries. With the sharp increase in the production and sales of new energy vehicles, the peak of power battery retirement is approaching. According to estimates, the demand for power lithium batteries will reach 125Gwh by 2020, and the amount of scrap will be 32.2Gwh, about 500,000 tons; by 2023, scrap The volume will reach 101Gwh, about 1.16 million tons. If discarded lithium-ion batteries are discarded at will, the electrolyte salts and organic solvents i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/04
CPCC01D15/04C01P2006/80Y02W30/84
Inventor 文小强周有池郭春平王玉香刘雯雯赖华生普建周新华
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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