A regeneration treatment method of lithium iron phosphate waste

A lithium iron phosphate and treatment method technology, which is applied in the field of regeneration treatment of lithium iron phosphate waste, can solve problems such as the performance of lithium iron phosphate materials needs to be improved, the difficulty of recycling lithium iron phosphate waste, and the strict requirements for waste components, so as to avoid alkali The generation of non-toxic substances and lithium phosphate, the saving of chemical raw materials, and the effect of low recycling cost

Active Publication Date: 2019-01-11
嘉兴晟源工业设计有限公司
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  • Claims
  • Application Information

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Problems solved by technology

However, this method basically inherits the micro-morphological characteristics of the waste, and it is difficult to recycle the lithium iron phosphate waste with unqualified appearance, and the composition requirements of the waste are relatively strict, and the difference in certain iron-phosphorus ratios of lithium is large or occurs. Process abnormal scrap difficult
Therefore, this method is not adaptable
[0005] Chinese invention patent application 201010253859.5 discloses the recycling of waste lithium-ion power batteries in water system to prepare lithium iron phosphate belongs to the co-precipitation technology, and the performance of the prepared lithium iron phosphate material needs to be improved

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  • A regeneration treatment method of lithium iron phosphate waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Dissolution: The waste of lithium iron phosphate production with unqualified physical and chemical properties was taken for component analysis. The test results showed that the main components of the waste were: lithium 4.22wt%, iron 33.36wt%, phosphate radical 58.2wt%, carbon 2.46wt% and 1.733wt% % other unavoidable trace elements, determine the effective molar weight of the waste material, i.e. the molar weight of lithium iron phosphate, the waste material is proportioned by the effective amount and sulfuric acid with a molar weight of 1:1.5, and the waste material 645.30g, wt% is 98 Concentrated sulfuric acid 600g and deionized water 4000g were stirred and dissolved at room temperature under nitrogen protection for 2 hours to prepare a solution with a hydrogen ion concentration of 2.0mol / L;

[0034] (2) Separation: Use a vacuum filter to filter the solution prepared in step (1) to obtain 3992.7 g of the primary filtrate and 499.5 g of the primary filter residue, w...

Embodiment 2

[0042] (1) Dissolution: Take the lithium-deficient (unqualified ratio) lithium iron phosphate production material for component analysis. The test results show that the main components of the waste are: lithium 3.91wt%, iron 33.46wt%, phosphate radical 58.5wt%, carbon 2.24wt% %. And 2.09wt% other unavoidable trace elements, determine the effective molar weight of the waste material, i.e. the molar weight of lithium iron phosphate, mix the waste material according to the effective amount and hydrochloric acid with a molar weight of 1:4, weigh the waste material 643.10g, wt% 1600g of 36.5 concentrated hydrochloric acid and 984g of deionized water were stirred and dissolved at room temperature under nitrogen protection for 5h to prepare a solution with a hydrogen ion concentration of 4.0mol / L;

[0043] (2) Separation: Use a vacuum filter to filter the solution prepared in step (1) to obtain 2810.7 g of the primary filtrate and 387.5 g of the primary filter residue, wash and filte...

Embodiment 3

[0051] (1) Dissolution: The lithium iron phosphate production waste with abnormal appearance (abnormal equipment, high sintering temperature) was taken for component analysis. The test results showed that the main components of the waste were: lithium 4.25wt%, iron 33.35wt%, phosphate radical 58.4wt% , carbon 2.41wt% and 1.59wt% other unavoidable trace elements, determine the effective molar weight of the waste material, that is, the molar weight of lithium iron phosphate, mix the waste material with the molar weight of 1:1.5 according to the effective amount and sulfuric acid, and weigh the waste material 645.50g, 600g of concentrated sulfuric acid with a wt% of 98 and 4000g of deionized water were stirred and dissolved at room temperature under nitrogen protection for 5 hours to prepare a solution with a hydrogen ion concentration of 2.0mol / L;

[0052] (2) Separation: Use a vacuum filter to filter the solution prepared in step (1) to obtain 3983.5 g of the primary filtrate an...

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Abstract

The invention discloses a regeneration treatment method of lithium iron phosphate waste, belonging to the technical field of methods and devices for directly converting chemical energy into electric energy. The method includes eight steps of dissolving, separating, adjusting composition, preparing ferrous phosphate precursor, preparing lithium phosphate precursor, preparing mixed slurry, preparinguncoated lithium iron phosphate and coating and sintering. This method can recover and dispose all kinds of abnormal production wastes, such as of unbalanced proportion, unqualified physical and chemical properties, serious oxidation, magnetic substance exceeding standard, etc., and has strong adaptability. And the process is simple, no complex smelting separation, saving a lot of chemical raw materials, low recovery cost. The lithium, iron and phosphorus elements in the waste can be recycled, ferrous phosphate and lithium phosphate can be prepared at the same time, and the prepared lithium iron phosphate positive electrode material has excellent performance, and can be directly used in the preparation of lithium iron phosphate power batteries.

Description

technical field [0001] The invention belongs to the technical field of methods and devices for directly converting chemical energy into electrical energy, and in particular relates to a regeneration treatment method for lithium iron phosphate waste. Background technique [0002] Lithium iron phosphate cathode material is widely used in new energy vehicles, energy storage batteries and other fields due to its low price, environmental friendliness and excellent safety performance. However, in the process of producing lithium iron phosphate, often due to the imbalance of the ratio and the fault of the process, there will inevitably be waste. These wastes are of high purity and are not as complex as lithium iron phosphate in waste batteries, but basically maintain the same elements as qualified lithium iron phosphate. Therefore, recycling waste and old lithium iron phosphate will lead to waste of resources, Disadvantages such as low added value and long process. [0003] Aimin...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M4/36H01M4/58H01M4/62
CPCH01M4/366H01M4/5825H01M4/625H01M10/54Y02E60/10Y02W30/84
Inventor 王书珍
Owner 嘉兴晟源工业设计有限公司
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