Method for selectively leaching lithium from anode material of failed lithium iron phosphate battery

A lithium iron phosphate battery and positive electrode material technology, applied in the field of selective leaching of lithium, can solve the problems of large impurities and low recovery efficiency of iron phosphate, and achieve the effects of higher acid consumption, better separation effect and less acid consumption

Active Publication Date: 2017-03-22
JIANGXI HZONE LITHIUM TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] In order to overcome the technical deficiencies of the low efficiency of iron phosphate recovery in the method for the positive electrode material of the invalid lithium iron phosphate battery in the prior art and the relatively large impurities in the lithium-containing solution, the present invention discloses a method using H 3 PO 4 -H 2 o 2 Systematic method for treating invalid lithium iron phosphate battery cathode material

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0017] Example 1: A method using H 3 PO 4 -H 2 o 2 Systematic method for treating invalid lithium iron phosphate battery cathode material

[0018] The anode material of the spent lithium iron phosphate battery, after removing aluminum, is mixed with a phosphoric acid solution with a mass fraction of 10% at a liquid-solid mass ratio of 5:1 and continuously stirred. Slowly add hydrogen peroxide solution with a mass fraction of 50% at 25°C, the mass ratio of the added hydrogen peroxide to the positive electrode material is 0.5:1, react with Na 3 PO 4 The pH of the solution was adjusted to 4.5. Filtration, the filter residue is ferric phosphate, the filtrate is the deferron leaching solution, and the leaching rate of lithium is 95.23%.

Embodiment 2

[0019] Example 2: A method using H 3 PO 4 -H 2 o 2 Systematic method for treating invalid lithium iron phosphate battery cathode material

[0020] The anode material of the spent lithium iron phosphate battery, after removing aluminum, was mixed with the phosphoric acid solution with a mass fraction of 85% according to the liquid-solid mass ratio of 0.5:1, and the slurry was continuously stirred. Slowly add hydrogen peroxide solution with a mass fraction of 10% at 90°C, the mass ratio of the added hydrogen peroxide to the positive electrode material is 3:1, react with K after 6 hours 3 PO 4 The pH of the solution was adjusted to 3.0. Filtration, the filter residue is ferric phosphate, the filtrate is the deferron leaching solution, and the leaching rate of lithium is 99.21%.

Embodiment 3

[0021] Example 3: A method using H 3 PO 4 -H 2 o 2 Systematic method for treating invalid lithium iron phosphate battery cathode material

[0022] The anode material of the spent lithium iron phosphate battery, after removing aluminum, is mixed with a phosphoric acid solution with a mass fraction of 50% at a liquid-solid mass ratio of 0.5:1 and continuously stirred. Slowly add a hydrogen peroxide solution with a mass fraction of 35% at 60°C, the mass ratio of the added hydrogen peroxide to the positive electrode material is 1.5:1, and react with Na 3 PO 4 with K 3 PO 4 The mixed solution was adjusted to pH 4.0. Filtration, the filter residue is ferric phosphate, the filtrate is the deferron leaching solution, and the lithium leaching rate is 99.83%.

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Abstract

The invention relates to a method for selectively leaching lithium from an anode material of failed lithium iron phosphate battery, and belongs to the technical field of reuse of wastes. In order to overcome the technical shortcomings of low recycle efficiency of ferric phosphate and big impurity of lithium solution in the method of selectively leaching lithium from an anode material of failed lithium iron phosphate battery, the invention discloses a method for selectively leaching lithium from the anode material of failed lithium iron phosphate battery by using H3PO4-H2O2 system. According to the method for selectively leaching lithium from the anode material of failed lithium iron phosphate battery by using H3PO4-H2O2 system, the pH value of the system is 2.0-4.5, thus the effect of selectively leaching lithium is reached, the filtering slag is ferric phosphate and carbon powder. The method can perfectly separate lithium and iron, so that iron can be completely settled in the form of iron phosphate; lithium is dissolved in the leaching solution in the form of lithium dihydrogen phosphate.

Description

technical field [0001] The invention relates to a method for selectively leaching lithium from positive electrode materials of spent lithium iron phosphate batteries, and belongs to the technical field of waste recycling. Background technique [0002] The method of using a mixed acid system to process and leach lithium from the positive electrode material of the invalid lithium iron phosphate battery is disclosed in the patent: A method for recycling the positive electrode waste of the lithium iron phosphate battery [P], 201310105713.X. The method discloses a method for recovering aluminum, iron and lithium in positive electrode waste sheets of lithium iron phosphate waste batteries by an acid-base leaching method. In this method, the positive electrode of the lithium iron phosphate battery is first removed, dissolved with alkali, and after filtration, the filter residue is dissolved with a mixed acid solution, so that iron exists in the form of iron phosphate precipitation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B7/00
CPCC22B7/007H01M10/54Y02P10/20Y02W30/84
Inventor 胡简郭永兴祝宏帅王迎春曾小毛欧阳红勇刘金练樊磊
Owner JIANGXI HZONE LITHIUM TECH
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