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Lithium iron phosphate waste recovery method and application thereof

A recycling method and technology for lithium iron phosphate, applied in the field of recycling lithium iron phosphate waste, can solve the problems of low recovery rate of key element lithium and high energy consumption, etc.

Active Publication Date: 2021-04-23
HUNAN BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can comprehensively recover the metal elements in the positive electrode material and improve the utilization rate of resource recovery, multiple roastings are carried out in the whole process route, the overall energy consumption is large, and the recovery rate of the key element lithium is low.

Method used

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  • Lithium iron phosphate waste recovery method and application thereof

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Effect test

Embodiment 1

[0038] The recovery method of the lithium iron phosphate waste material of the present embodiment may further comprise the steps:

[0039] (1) dismantling, crushing and sieving the lithium iron phosphate waste to obtain lithium iron phosphate powder;

[0040] (2) Weigh 500g of lithium iron phosphate powder with a mass fraction of 67.7%, configure 3000ml of NaOH solution with a mass fraction of 10%, and mix to obtain a lithium iron phosphate slurry;

[0041] (3) Place the slurry obtained in step (2) in a constant temperature water bath at a temperature of 80° C., feed air, react for 120 minutes, filter to obtain 2887 ml of lye containing sodium metaaluminate and sodium phosphate, and obtain lithium phosphate, 409.2 grams of slag material of carbon powder and ferric oxide;

[0042] (4) Take step (3) slag material 300g of lithium phosphate, carbon powder and ferric oxide, configure 2400ml mass fraction of 10% ammonia solution, mix under nitrogen atmosphere to obtain lithium phos...

Embodiment 2

[0047] The recovery method of the lithium iron phosphate waste material of the present embodiment may further comprise the steps:

[0048] (1) dismantling, crushing and sieving the lithium iron phosphate waste to obtain lithium iron phosphate powder;

[0049] (2) Weigh 500g of lithium iron phosphate powder with a mass fraction of 67.7%, configure 3000ml of NaOH solution with a mass fraction of 12%, and mix to obtain a lithium iron phosphate slurry;

[0050] (3) Place the slurry obtained in step (2) in a constant temperature water bath at a temperature of 80° C., feed air, react for 120 minutes, filter to obtain 2905 ml of lye containing sodium metaaluminate and sodium phosphate, and obtain lithium phosphate, 408.8 grams of slag material of carbon powder and ferric oxide;

[0051] (4) Take step (3) slag material 300g of lithium phosphate, carbon powder and ferric oxide, configure 2400ml mass fraction 8% ammonia solution, mix under nitrogen atmosphere to obtain lithium phosphat...

Embodiment 3

[0055] The recovery method of the lithium iron phosphate waste material of the present embodiment may further comprise the steps:

[0056] (1) dismantling, crushing and sieving the lithium iron phosphate waste to obtain lithium iron phosphate powder;

[0057] (2) Weigh 500g of lithium iron phosphate powder with a mass fraction of 67.7%, configure 2500ml of NaOH solution with a mass fraction of 5%, and mix to obtain a lithium iron phosphate slurry;

[0058] (3) Place the slurry obtained in step (2) in a constant temperature water bath at a temperature of 80° C., react for 90 minutes, filter to obtain 2412 ml of lye containing sodium metaaluminate, and obtain 473.1 ml of slag containing lithium iron phosphate and carbon powder gram;

[0059] (4) Get the leach solution and lithium iron phosphate slag obtained in step (3), carry out processes such as dilution and slag, and obtain the leaching rates of aluminum, phosphorus, and lithium to be 70.8%, 2.47%, and 2.82%, respectively. ...

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Abstract

The invention belongs to the technical field of waste battery material recovery, and discloses a lithium iron phosphate waste recovery method and application thereof. The lithium iron phosphate waste recovery method comprises the following steps of enabling lithium iron phosphate waste to be disassembled, smashed and sieved to obtain lithium iron phosphate powder, diluting the ionic membrane liquid caustic soda, adding lithium iron phosphate powder, stirring, carrying out a water bath reaction in an oxidizing atmosphere, and filtering to obtain a leachate and lithium phosphate slag, drying the lithium phosphate residues, adding an ammonia water solution for reaction, and filtering to obtain an ammonia water solution containing lithium phosphate and filter residues, and evaporating the ammonia water solution containing lithium phosphate to obtain lithium phosphate. The content of aluminum in the obtained lithium iron phosphate slag is 0.08% after alkaline leaching aluminum removal in the oxidizing atmosphere, and what is found is that a liquid phase basically does not contain iron through multiple experiments and determination of the liquid phase, which indicates that the loss rate of iron is almost zero; the loss rate of lithium is 2.8-3.3%; and the loss rate of phosphorus is 2.5-3.0%.

Description

technical field [0001] The invention belongs to the technical field of recycling waste battery materials, and in particular relates to a method for recycling lithium iron phosphate waste and its application. Background technique [0002] With the rapid development of the new energy industry, the stock of waste power batteries has also ushered in explosive growth, of which lithium iron phosphate batteries account for a large proportion. At present, the recycling methods of waste lithium iron phosphate batteries are divided into: fire recycling, wet recycling, high temperature solid phase repair technology and bioleaching technology. Among them, the most widely used is the wet recovery process. Its main technical route is to use an acid-base solution to form a precipitate in the process of dissolving lithium iron phosphate, and the metal ions exist in the form of oxides and salts to remove copper and aluminum. and other impurity elements, with lithium salt and iron phosphate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30C01G49/08H01M10/0525H01M10/54
CPCC01B25/306C01G49/08H01M10/0525H01M10/54C01P2006/80Y02E60/10Y02W30/84C22B26/12C22B1/24C22B7/008C01B25/305C22B7/005H01M4/5825
Inventor 李杰段金亮乔延超陈若葵李长东
Owner HUNAN BRUNP RECYCLING TECH
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