Method for recycling waste positive electrode materials of lithium batteries

A recycling method and cathode material technology, which are used in the wet recycling of lithium valuable metals, nickel, aluminum and cobalt in waste lithium batteries, and can solve problems such as environmental hazards of heavy metals and waste of resources.

Inactive Publication Date: 2019-05-10
池州西恩新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is not disposed of safely, the heavy metals in it will cause great harm to the environment, and will also cause a huge waste of resources

Method used

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  • Method for recycling waste positive electrode materials of lithium batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of recycling method of waste cathode material of lithium battery, such as figure 1 shown, including the following steps:

[0026] 1) Take 3.1 tons of lithium battery cathode materials, including 927kg of nickel, 662kg of cobalt, 156kg of lithium, and 113kg of aluminum, and add them to 25m 3 Beat in soft water, add sulfuric acid and hydrogen peroxide, react for 3 hours and the pH of the solution reaches 2, press filter to get the first solution 21m 3 , in which the total concentration of nickel, cobalt and manganese reaches 76g / l;

[0027] 2) Adjust the pH of the first solution to 4 with nickel carbonate, and obtain the second solution after pressure filtration, wherein the aluminum ion concentration is 7 mg / l;

[0028] 3) the second solution that step 2) obtains is divided into 19m 3 Second solution I and 2m 3 second solution II;

[0029] 4) The second solution I enters the MVR evaporation system, and the evaporation temperature is 70°C. When it is concentra...

Embodiment 2

[0032] A kind of recycling method of waste cathode material of lithium battery, such as figure 1 shown, including the following steps:

[0033] 1) Take a total of 3.3 tons of lithium battery cathode materials, lithium cobalt oxide cathode materials, etc., including 1053kg of nickel, 960kg of cobalt, 191kg of lithium, and 101kg of aluminum, and add them to 23m 3 Make slurry in soft water, add sulfuric acid and hydrogen peroxide, react for 5 hours and the pH of the solution reaches 3, press filter to obtain the first solution 20m 3 , where the total concentration of nickel, cobalt and manganese reaches 96g / l;

[0034] 2) Adjust the pH of the first solution to 6 with nickel carbonate, obtain the second solution after pressure filtration, wherein the aluminum ion concentration is 5 mg / l;

[0035] 3) the second solution that step 2) obtains is divided into 15m 3 Second solution 1 and 5m 3 second solution II;

[0036] 4) The second solution I enters the MVR evaporation system, ...

Embodiment 3

[0039] A kind of recycling method of waste cathode material of lithium battery, such as figure 1 shown, including the following steps:

[0040]1) Take a total of 3.5 tons of lithium cobaltate positive electrode materials and lithium nickelate positive electrode materials, including 1122kg of nickel, 558kg of cobalt, 203kg of lithium, and 81kg of aluminum, and add them to 23m 3 beating in soft water, adding sulfuric acid and hydrogen peroxide, the pH of the solution reached 2.3 after 4 hours of reaction, press filtration to obtain the first solution of 20.5m 3 , wherein the total concentration of nickel, cobalt and manganese reaches 82g / l;

[0041] 2) Adjust the pH of the first solution to 5 with nickel carbonate, obtain the second solution after pressure filtration, wherein the aluminum ion concentration is 7 mg / l;

[0042] 3) the second solution that step 2) obtains is divided into 16.5m 3 Second solution I and 4m 3 second solution II;

[0043] 4) The second solution I e...

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Abstract

The invention provides a method for recycling waste positive electrode materials of lithium batteries. The method includes steps: 1) subjecting the waste positive electrode materials of the lithium batteries to reductive acid leaching in sulfuric acid and hydrogen peroxide, and performing filter pressing to obtain first solution; 2) adjusting a pH value of the first solution, and performing filterpressing to obtain second solution; 3) dividing the second solution into second solution I and second solution II; 4) subjecting the second solution I to MVR evaporative concentration, and centrifuging to obtain lithium sulfate crystal and first centrifugal mother liquor; 5) adding the second solution II into the first centrifugal mother liquor to dilute, cooling, crystallizing and centrifuging to obtain one of nickel-cobalt sulfate eutectic crystal, nickel sulfate crystal and cobalt sulfate crystal and second centrifugal mother liquor. By the method for recycling, the lithium sulfate crystaland one of the nickel-cobalt sulfate eutectic crystal, nickel sulfate crystal and cobalt sulfate crystal are used as a raw material for production of lithium carbonate or lithium hydroxide and a rawmaterial for production of precursors of positive electrode materials respectively.

Description

technical field [0001] The invention belongs to the technical field of recycling waste batteries, and in particular relates to a wet recycling method for nickel, cobalt, aluminum and lithium valuable metals in waste lithium batteries. Background technique [0002] In recent years, the explosive growth of new energy vehicles has promoted the vigorous development of the lithium battery industry. There are hundreds of millions of lithium batteries produced every year, and it is growing at a rate of more than 20%. At the same time, the number of waste batteries is also increasing rapidly. It is estimated that by 2020, the amount of scrapped lithium batteries will reach more than 32GWH, about 500,000 tons of battery materials. [0003] At present, the positive electrode materials of lithium batteries are mainly composed of lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, lithium nickel cobalt manganese oxide, etc. After these lithium b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/06C01G51/10C01G53/10H01M10/54
CPCC22B23/043C22B26/12C22B3/22C22B23/0461C22B3/08C22B3/44C22B7/007Y02P10/20
Inventor 赵志安易飞鸿
Owner 池州西恩新材料科技有限公司
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