Integral recycling method of lithium iron phosphate positive electrode material

A cathode material, lithium iron phosphate technology, which is applied in the field of lithium iron phosphate cathode material recovery of lithium, iron and phosphorus, can solve the problems of complex process, high processing cost, waste of phosphorus resources, etc., to achieve mild process conditions and low residue less, process cleaning effect

Active Publication Date: 2018-05-25
北京中科百特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method first uses alkali and then acid to decompose the lithium iron phosphate positive electrode material, the process is complicated, and the processing cost is high; at the same time, iron is precipitated in the form of iron phosphate and mixed with impurities such as carbon black to be discharged as waste residue, and it has not been commercialized. , resulting in waste of iron and phosphorus resources

Method used

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  • Integral recycling method of lithium iron phosphate positive electrode material

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Effect test

Embodiment 1

[0043] A comprehensive recovery method for waste and old lithium iron phosphate cathode materials, comprising the steps of:

[0044](1) Mix the waste lithium iron phosphate cathode material with condensed water to slurry, add sulfuric acid to it after the slurries are complete, the mass ratio of sulfuric acid (the content is calculated as 100wt%) to the cathode material is 0.3; In order to realize the decomposition of the positive electrode material under the condition of 150°C, the liquid-solid separation of the reacted material is carried out to obtain the leaching liquid and the residue respectively;

[0045] (2) adding ammonia water to the leaching solution to adjust the pH to 1.5, and precipitating ferric phosphate at normal temperature;

[0046] (3) adjusting pH to 5 with ammonia water in the pickling solution after precipitating ferric phosphate, precipitation of impurities such as aluminum and iron in the solution, and obtaining mixed hydroxide precipitation and purifi...

Embodiment 2

[0051] A comprehensive recovery method for waste and old lithium iron phosphate cathode materials, comprising the steps of:

[0052] (1) Mix the waste lithium iron phosphate positive electrode material with condensed water to slurry, add hydrochloric acid to it after the slurry is complete, the mass ratio of hydrochloric acid (content is calculated by 100wt%) to positive electrode material is 1; In order to realize the decomposition of the positive electrode material under the condition of 120°C, the liquid-solid separation of the reacted material is carried out to obtain the leaching liquid and the residue respectively;

[0053] (2) adding ammonium bicarbonate to the leaching solution to adjust the pH to 1.5, and precipitate ferric phosphate at 60°C;

[0054] (3) The pH of the pickling solution after the precipitation of ferric phosphate is adjusted to 8 with ammonium bicarbonate, the impurities such as aluminum and iron in the solution are precipitated, and the mixed hydroxi...

Embodiment 3

[0059] A comprehensive recovery method for waste and old lithium iron phosphate cathode materials, comprising the steps of:

[0060] (1) Mix the waste lithium iron phosphate positive electrode material with condensed water to slurry, add nitric acid to it after the slurry is complete, the mass ratio of nitric acid (content in 100wt%) to the positive electrode material is 2; In order to realize the decomposition of the positive electrode material under the condition of 90°C, the liquid-solid separation of the reacted material is carried out, and the leachate and residue are obtained respectively;

[0061] (2) adding sodium bicarbonate to the leaching solution to adjust the pH to 3, and precipitating ferric phosphate at 90°C;

[0062] (3) adjusting the pH to 8 with sodium bicarbonate in the pickling solution after the precipitation of iron phosphate, precipitation of impurities such as aluminum and iron in the solution, and obtaining mixed hydroxide precipitation and purificatio...

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Abstract

The invention provides an integral recycling method of a lithium iron phosphate positive electrode material. The integral recycling method comprises the steps of (1) preparing paste from the lithium iron phosphate positive electrode material, mixing the paste and an acid for leaching reaction, and performing liquid-solid separation to obtain a leaching liquid and residue; (2) adjusting a pH valueof the leaching liquid to 1.5-3, and performing solid-liquid separation to obtain iron phosphate and a deironing acid liquid; (3) adjusting a pH value of the deironing acid liquid to 5-8, and performing solid-liquid separation to obtain a precipitant of aluminum and iron and a lithium-containing purification liquid; and (4) and performing post-treatment on the purification liquid to obtain a lithium product and a precipitation mother liquid. By the method, the recycling rates of lithium, iron and phosphate all are larger than 95wt%, the purity of the obtained lithium carbonate product is larger than 98.5wt%, the impurity content conforms to the requirement of GB/T11075-2013, the iron phosphate product conforms to the quality requirement (HG/T 4701-2014) of battery-level iron phosphate, theresidue discharging quantity is reduced by 85wt%, the flow is simple, and the process is clean.

Description

technical field [0001] The invention belongs to the technical field of resource recovery, and relates to a comprehensive recovery method for positive electrode materials, in particular to a recovery method for lithium, iron and phosphorus in lithium iron phosphate positive electrode materials. Background technique [0002] Lithium iron phosphate material (LFP for short) has attracted much attention because of its abundant raw material sources, low price, non-toxicity, high theoretical capacity, good thermal stability and good cycle performance, and is the development direction of power batteries. With the increase in the use of lithium iron phosphate power batteries, the disposal of waste lithium iron phosphate batteries will become a key link in the field of new energy. If waste batteries are not disposed of safely, it will cause great harm to the environment and public safety. The current conventional practice is to recycle the metal element in the outer skin and the posi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B7/00C22B26/12
CPCC22B7/007C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 郑诗礼张洋李平周宏明张敏王晓健范兵强王宏岩
Owner 北京中科百特科技有限公司
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