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Recovery method and application of lithium iron phosphate waste

A recovery method, lithium iron phosphate technology, applied in the field of lithium iron phosphate waste recycling, can solve the problems of large consumption of reagents, high cost, uneconomical, etc., achieve high value-added resource recovery, ease the pressure of processing, and recover high rate effect

Active Publication Date: 2021-08-17
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned recycling methods, the efficient and high-value-added resource recovery of lithium iron phosphate waste is not well realized, and the process steps are complicated, there are many process steps, the consumption of reagents is large, the cost is high, and it is not economically cost-effective.

Method used

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  • Recovery method and application of lithium iron phosphate waste
  • Recovery method and application of lithium iron phosphate waste
  • Recovery method and application of lithium iron phosphate waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The recovery method of the lithium iron phosphate waste material of the present embodiment may further comprise the steps:

[0045] (1) Slurry lithium iron phosphate waste and water at a solid-to-liquid ratio of 5:1, add 30% liquid caustic soda to adjust the pH to 8.2, heat and react at 60°C for 120 minutes, and filter and separate after the reaction to obtain a filter residue ;

[0046] (2) Wash and dry the filter residue, then add the dried filter residue into 2mol / L sulfuric acid solution, stir and react at 80°C for 3h, separate liquid and solid, and save the filtrate (liquid iron);

[0047] (3) dissolving oxalic acid in deionized water to configure 10% oxalic acid solution, adding 10% ethanol as surfactant, and dissolving oxalic acid;

[0048] (4) by Fe 2+ :C 2 o 4 2- The molar ratio is 1:1.3, under stirring at 70°C, continuously add oxalic acid solution to molten iron for 2 hours, after the oxalic acid solution is added, stop stirring, and age at 70°C for 5 hour...

Embodiment 2

[0052] The recovery method of the lithium iron phosphate waste material of the present embodiment may further comprise the steps:

[0053] (1) Slurry lithium iron phosphate waste and water at a solid-to-liquid ratio of 3:1, add 30% liquid caustic soda to adjust the pH to 8.5, heat and react at 55°C for 150 minutes, and filter and separate after the reaction to obtain a filter residue ;

[0054] (2) Wash and dry the filter residue, add the dried filter residue into 2mol / L sulfuric acid solution, stir and react at 80°C for 3h, separate the liquid and solid, and save the filtrate (liquid iron);

[0055] (3) dissolving oxalic acid in deionized water to configure 10% oxalic acid solution, adding 10% ethanol as surfactant, and dissolving oxalic acid;

[0056] (4) by Fe 2+ :C 2 o 4 2- The molar ratio is 1:1.3. Continue to add oxalic acid solution to molten iron at 80°C under stirring for 2 hours. After the oxalic acid solution is added, stop stirring and age at 80°C for 6 hours....

Embodiment 3

[0060] The recovery method of the lithium iron phosphate waste material of the present embodiment may further comprise the steps:

[0061] (1) Slurry lithium iron phosphate waste and water at a solid-to-liquid ratio of 5:1, add 20% liquid caustic soda to adjust the pH to 8.4, heat and react at 65°C for 150 minutes, and filter and separate after the reaction to obtain a filter residue ;

[0062] (2) Wash and dry the filter residue, add the dried filter residue into 2mol / L sulfuric acid solution, stir and react at 80°C for 3h, separate the liquid and solid, and save the filtrate (liquid iron);

[0063] (3) dissolving oxalic acid in deionized water to configure 20% oxalic acid solution, adding 10% ethanol as surfactant, and dissolving oxalic acid;

[0064] (4) by Fe 2+ :C 2 o 4 2- The molar ratio is 1:1.2. Continue to add oxalic acid solution to molten iron at 75°C under stirring for 2 hours. After the oxalic acid solution is added, stop stirring and age at 75°C for 5 hours....

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Abstract

The invention belongs to the technical field of battery recovery, and discloses a recovery method and application of lithium iron phosphate waste. The method comprises the following steps: mixing the lithium iron phosphate waste with water to prepare slurry, adding alkali to adjust the pH value to be alkaline, heating to react, filtering and separating to obtain filter residues; dissolving the filter residue in acid, filtering and separating, taking filtrate, adding a solution containing oxalate, reacting, aging, filtering and separating to obtain a filter cake and a precipitation mother solution; and pulping, washing and removing free water from the filter cake to obtain ferrous oxalate. The method comprises the following steps: adding the alkali to adjust the pH value, dissolving the filter residue with acid, carrying out solid-liquid separation, removing the filter residue, adding an oxalate-containing substance into the filtrate, heating and precipitating to obtain the ferrous oxalate precipitate. Compared with the process for synthesizing iron phosphate by using the lithium iron phosphate waste, the process for synthesizing ferrous oxalate by using the lithium iron phosphate waste is easier to control, and the iron recovery rate is higher and can reach 99%.

Description

technical field [0001] The invention belongs to the technical field of battery recycling, and in particular relates to a recycling method and application of lithium iron phosphate waste. Background technique [0002] Lithium iron phosphate is considered to be the most promising anode material for a new generation of safe and environment-friendly lithium-ion power batteries. It has high specific capacity, high stability, and good cycle performance. It can be widely used in new energy vehicles, energy storage equipment and other fields. . [0003] At present, the preparation methods of lithium iron phosphate mainly include high-temperature solid-phase method, microwave synthesis method, hydrothermal method, sol-gel method, coprecipitation method, etc., among which iron source is the key raw material for producing lithium iron phosphate cathode material, oxalate Iron is one of the most commonly used iron sources for the synthesis of lithium iron phosphate, and the use of ferro...

Claims

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Application Information

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IPC IPC(8): C07C51/41C07C51/42C07C55/07C01B25/30H01M10/54
CPCC07C51/412C07C51/42H01M10/54C01B25/305C07C55/07Y02W30/84B09B2101/16B09B3/70C01B25/30H01M4/5825B09B3/00C07C51/41C01D15/00C01G49/16C01P2002/72C01P2004/03C22B1/005
Inventor 段金亮李长东夏阳阮丁山陈若葵乔延超
Owner GUANGDONG BRUNP RECYCLING TECH
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