Method for preparing battery-grade iron phosphate and industrial-grade lithium phosphate from waste lithium iron phosphate batteries

A lithium iron phosphate battery and iron phosphate technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems that have not been seen yet, meet high environmental protection recycling requirements, and reduce consumption

Active Publication Date: 2022-05-10
SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there are no public documents that use the phosphoric acid dissolution method to efficiently recycle waste lithium iron phosphate positive plates to prepare battery-grade iron phosphate and industrial-grade lithium phosphate products.

Method used

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  • Method for preparing battery-grade iron phosphate and industrial-grade lithium phosphate from waste lithium iron phosphate batteries
  • Method for preparing battery-grade iron phosphate and industrial-grade lithium phosphate from waste lithium iron phosphate batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Disassemble the waste lithium iron phosphate battery, and sort out the positive pole piece; after cleaning, put it in a heating furnace at 200 ° C, and bake it for 3 hours; take out the pole piece, mechanically crush it, and sieve it to obtain aluminum flakes and lithium iron phosphate-based positive electrode material;

[0036] (2) Get 200 g of the positive electrode material obtained and mix it with 46 g of ferrous oxide, and add it to 1.34 L of a 15% mass fraction of phosphoric acid solution and hydrogen peroxide mixed solution; add water and dilute it and stir it in a water bath at 80° C. for 4 hours to obtain ferric phosphate slurry;

[0037] (3) Wash and filter the ferric phosphate slurry obtained in (2), dry the obtained ferric phosphate filter cake and dehydrate at 500° C. for 4 hours to obtain battery-grade ferric phosphate; after the filtrate is concentrated and evaporated 4 times, keep the solution temperature at 80 ℃, after adding sodium hydroxide solut...

Embodiment 2

[0040] (1) Disassemble the waste lithium iron phosphate battery, and sort out the positive pole piece; after cleaning, put it in a heating furnace at 400 ° C, and bake it for 5 hours; take out the pole piece, mechanically crush it, and sieve it to obtain aluminum flakes and lithium iron phosphate-based positive electrode material;

[0041] (2) Mix 500 g of the positive electrode material obtained with 508 g of ferric hydroxide, and add it to 4.2 L of 20% phosphoric acid solution and hydrogen peroxide mixed solution; dilute with water and stir for 2 h in a water bath at 50° C. to obtain ferric phosphate slurry;

[0042] (3) Wash and filter the ferric phosphate slurry obtained in (2), dry the obtained ferric phosphate filter cake and dehydrate at 400°C for 6 hours to obtain battery-grade ferric phosphate; after the filtrate is concentrated and evaporated twice, keep the solution temperature at 90 ℃, after adding sodium hydroxide solution, adjust the pH to 4.5, and iron hydroxid...

Embodiment 3

[0045] (1) Disassemble the waste lithium iron phosphate battery, and sort out the positive pole piece; after cleaning, put it in a heating furnace at 500°C, and roast it for 1.5h; take out the pole piece, mechanically crush it, and sieve to obtain aluminum pieces and lithium iron phosphate as The main positive electrode material;

[0046] (2) Take 1000 g of the positive electrode material obtained and mix it with 177 g of iron, and add it to 1.16 L of a 20% mass fraction of phosphoric acid solution and hydrogen peroxide mixed solution; add water to dilute it and stir it in a water bath at 95° C. for 1 h to obtain ferric phosphate slurry ;

[0047] (3) Wash and filter the ferric phosphate slurry obtained in (2), dry the obtained ferric phosphate filter cake and dehydrate at 700°C for 1 hour to obtain battery-grade ferric phosphate; after the filtrate is concentrated and evaporated 10 times, keep the solution temperature at 50 ℃, after adding sodium hydroxide solution, adjust t...

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Abstract

The invention belongs to the technical field of recycling and comprehensive utilization of waste lithium-ion power batteries, and in particular relates to a method for preparing battery-grade iron phosphate and industrial-grade lithium phosphate from waste lithium iron phosphate batteries, comprising: dismantling the waste lithium iron phosphate cathode sheet After low-temperature roasting treatment, lithium iron phosphate powder is obtained; the powder is mixed with iron source materials, and a mixed solution of phosphoric acid and hydrogen peroxide is added to heat and react to obtain battery-grade iron phosphate precipitation and lithium-containing filtrate; the lithium-containing filtrate is evaporated and concentrated, and then added to alkaline solution After impurity, industrial-grade lithium phosphate precipitation is generated; the filtrate after precipitated lithium phosphate is added to a precipitant to generate a small amount of calcium phosphate precipitation, and the filtrate is concentrated and returned to recycling; this method uses phosphoric acid to treat waste lithium iron phosphate and iron source materials to generate more The high value-added iron phosphate and lithium phosphate in the industry can efficiently recover iron and lithium valuable metal materials in lithium iron phosphate, and the process is green and environmentally friendly with low cost.

Description

technical field [0001] The invention belongs to the technical field of recycling and comprehensive utilization of waste lithium ion power batteries, in particular to a method for preparing battery-grade iron phosphate and industrial-grade lithium phosphate from waste lithium iron phosphate batteries. Background technique [0002] In recent years, with the continuous attention and development of new energy vehicles, it has become an inevitable trend to replace traditional vehicles. In 2018, the annual sales of new energy electric vehicles in my country exceeded 2 million, a year-on-year increase of 722%. While new energy vehicles create green travel, they also bring corresponding problems. As the "heart" of new energy vehicles, the lifespan of lithium-ion power batteries is only 5 years on average. By 2020, the cumulative scrap of electric vehicle power batteries in my country will reach The scale of 120,000-170,000 tons. However, due to the complex structure of lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/37C01B25/30C01B25/32
Inventor 鲍维东裴晓东骆艳华钱有军佘世杰刘晨王凡陈静
Owner SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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