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Waste lithium ion battery selective lithium leaching process

A lithium-ion battery, selective technology, used in secondary batteries, battery recycling, circuits, etc., can solve the problems of harshness, complex process, introduction of impurity ions, etc., to reduce the cost of impurity removal, simplify the impurity removal process, and improve The effect of conversion efficiency

Pending Publication Date: 2020-10-23
HUNAN BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although the above method can achieve the purpose of selectively leaching lithium to a certain extent, there are many shortcomings in the leaching process, such as complex process, introduction of impurity ions or harsh conditions.

Method used

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Embodiment 1

[0035] This embodiment provides a process for selectively leaching lithium from waste lithium-ion batteries, in particular to a method for selectively leaching lithium from nickel-cobalt lithium manganese oxide pole piece powder, comprising the following steps:

[0036] (1) Mix nickel-cobalt lithium manganese oxide pole piece powder with 10mol / L sulfuric acid at a molar ratio of 1:1.5, mix evenly and put it in a muffle furnace for heat treatment, set the heat treatment temperature for a transformation process to 300°C, The time is 60min, the heating rate is 5°C / min; the heat treatment temperature of the second-stage decomposition process is 850°C, the time is 180min, and the heating rate is 10°C / min;

[0037] (2) Mix and grind the heat-treated product obtained in step (1) with water at a liquid-solid ratio of 1:1 for 15 minutes, filter and separate to obtain a lithium-rich solution and leaching residue.

[0038]The nickel-cobalt-lithium-manganese-oxide pole piece powder and th...

Embodiment 2

[0042] This embodiment provides a process for selectively leaching lithium from waste lithium-ion batteries, in particular to a method for selectively leaching lithium from lithium cobaltate pole piece powder, comprising the following steps:

[0043] (1) Mix the lithium cobaltate pole piece powder with 10mol / L sulfuric acid at a molar ratio of 1:1.2, mix evenly and put it in a muffle furnace for heat treatment, set the heat treatment temperature for a transformation process to 300°C, and the time is 60min, the heating rate is 5°C / min; the heat treatment temperature of the second-stage decomposition process is 800°C, the time is 120min, and the heating rate is 10°C / min;

[0044] (2) Mix and grind the heat-treated product obtained in step (1) with water at a liquid-solid ratio of 1:1 for 10 minutes, and filter and separate to obtain a lithium-rich solution and leaching residue.

[0045] The lithium cobaltate pole piece powder and leaching slag in the present embodiment are teste...

Embodiment 3

[0049] This embodiment provides a process for selectively leaching lithium from waste lithium-ion batteries, in particular to a method for selectively leaching lithium from nickel-cobalt lithium manganese oxide battery powder, comprising the following steps:

[0050] (1) Mix nickel-cobalt lithium manganese oxide battery powder with 12mol / L sulfuric acid at a molar ratio of 1:2, mix evenly and put it in a muffle furnace for heat treatment, set the heat treatment temperature for a transformation process to 300°C, and time 60min, the heating rate is 5°C / min; the heat treatment temperature of the second-stage decomposition process is 850°C, the time is 180min, and the heating rate is 10°C / min;

[0051] (2) Mix and grind the heat-treated product obtained in step (1) with water at a liquid-solid ratio of 1:1 for 15 minutes, filter and separate to obtain a lithium-rich solution and leaching residue;

[0052] The nickel-cobalt-manganese-manganate lithium battery powder and leaching sl...

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Abstract

The invention discloses a waste lithium ion battery selective lithium leaching process which comprises the following steps: (1) soaking a waste lithium ion battery in saline water for discharge treatment, disassembling and separating out a pole piece, drying, crushing, and screening to obtain a disassembled powder; (2) mixing the disassembled powder with a vulcanizing agent to form a mixture, wherein the vulcanizing agent contains sulfate radicals, subjecting the mixture to heat treatment through a first-stage transformation process and a second-stage decomposition process in sequence to obtain a heat treatment product, wherein the heat treatment temperature of the first-stage transformation process is 100-600 DEG C, and the heat treatment temperature of the second-stage decomposition process is 600-1400 DEG C; and (3) adding a leaching agent into the heat treatment product for leaching, and carrying out solid-liquid separation to obtain a lithium-rich solution. According to the method, two-stage heat treatment is adopted, so that the conversion efficiency of lithium is greatly improved, the leaching rate of lithium is increased, and the process has a good application prospect.

Description

technical field [0001] The invention relates to the field of electronic waste treatment, in particular to a process for selective lithium leaching of waste lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in various consumer electronics products, electric vehicles, energy storage and other fields due to their advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. , with the increase in the number of lithium-ion batteries used, their subsequent reasonable recycling is an important issue that needs to be solved. [0003] At present, the recycling methods of waste lithium-ion batteries mainly include acid leaching and roasting. The acid leaching method is the most common treatment method at present. The waste materials are dissolved by acid leaching to dissolve metal ions in the acid solution, and then add auxiliary materials to achieve ...

Claims

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Application Information

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IPC IPC(8): C01D15/06H01M10/0525H01M10/54
CPCC01D15/06H01M10/0525H01M10/54Y02E60/10Y02W30/84Y02P10/20
Inventor 段金亮乔延超陈若葵阮丁山杨鼎李书康李长东
Owner HUNAN BRUNP RECYCLING TECH