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Method for selectively recycling lithium in waste lithium iron phosphate battery

A lithium iron phosphate battery and lithium iron phosphate technology, applied in battery recycling, waste collector recycling, secondary batteries, etc., can solve problems such as extensive operating conditions, equipment corrosion, and complicated processing procedures, and achieve easy control of reaction conditions, The effect of mild operating conditions and simple treatment process

Pending Publication Date: 2022-02-11
江西悦锂科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes the entire treatment process cumbersome, the amount of chemicals used is large, the ball milling operation increases the treatment cost, and the inorganic salts produced in the process increase the subsequent wastewater treatment cost
Chinese patent CN108470952A proposes a low-temperature liquid phase selective recovery of lithium in waste lithium iron phosphate cathode materials. This method directly realizes selective leaching of lithium in a low-temperature liquid phase environment, and a lithium-rich solution can be obtained through subsequent simple filtration. , the process is simple to operate, which greatly reduces the cost of equipment, but in the selective leaching process, persulfate and hypochlorite are used as the leaching agent, and triethanolamine is used as an auxiliary agent, but the high temperature of the leaching process will cause corrosion to the equipment. Strong oxidizing reagents will affect health, making the whole process not green and environmentally friendly, and not meeting the requirements of green chemistry
[0004] It can be seen that the existing selective leaching process of lithium in waste lithium iron phosphate has a large amount of chemicals used, extensive operating conditions, inorganic salts are produced during the leaching process, and the treatment process is complicated.

Method used

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  • Method for selectively recycling lithium in waste lithium iron phosphate battery
  • Method for selectively recycling lithium in waste lithium iron phosphate battery
  • Method for selectively recycling lithium in waste lithium iron phosphate battery

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Experimental program
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Embodiment approach

[0034] As mentioned above, in the existing selective leaching process of lithium from waste lithium iron phosphate, there are disadvantages such as a large amount of chemicals used, extensive operating conditions, inorganic salts generated during the leaching process, and complicated treatment procedures. In order to solve these problems, the inventors have conducted a lot of research on the selective recovery technology of lithium in waste lithium iron phosphate batteries.

[0035] The inventors found that in an acidic environment, in an oxidizing gas environment, the Fe 2+ in situ oxidation to Fe 3+ , with FePO 4 The form of lithium remains in the leaching residue, and the lithium is dissolved into the solution by the acidic solution without any inorganic salt by-products during the process. The present invention was thus obtained.

[0036] Therefore, the present invention provides a method for selectively recovering lithium from waste lithium iron phosphate batteries, wh...

Embodiment 1

[0081] Example 1: Selective recovery of lithium from waste lithium iron phosphate batteries

[0082] (1) Selective leaching of lithium

[0083] Take 8g of lithium iron phosphate electrode material (4.66% lithium content, 38.05% iron content) in a round bottom flask, add 134mL of 0.4mol / L dilute hydrochloric acid ( leaching agent), 10 mg / L of ozone (introduction rate: 1.5 L / min) was introduced, and reacted at 20° C. for 1 hour to obtain lithium-containing leaching solution.

[0084] (2) filter to obtain low concentration lithium solution

[0085] The lithium-containing leaching solution in step (1) was filtered to obtain a low-concentration lithium solution. At this time, the measured lithium ion concentration was 2.6286g / L, and the iron ion concentration was 8.292mg / L, and the filter residue was washed with water to obtain iron phosphate residue.

[0086] (3) concentrated to obtain lithium-rich solution

[0087] Concentrate the low-concentration lithium solution obtained in...

Embodiment 2

[0091] Example 2: Selective recovery of lithium from waste lithium iron phosphate batteries

[0092] (1) Selective leaching of lithium

[0093] Take 8g of lithium iron phosphate electrode material (lithium containing lithium 4.66%, iron content 38.05%) in a round bottom flask, add 125mL of 0.5mol / L dilute hydrochloric acid according to the molar ratio of hydrogen ions and lithium ions in lithium iron phosphate 1:1.12 (Leaching agent), 10 mg / L of ozone (1.5 L / min) was passed through, and reacted at 20° C. for 1 h to obtain a lithium-containing leaching solution.

[0094] (2) filter to obtain low concentration lithium solution

[0095] The lithium-containing leaching solution in step (1) is filtered to obtain a low-concentration lithium solution. The lithium ion concentration measured at this time was 2.9574g / L, and the iron ion concentration was 36.437mg / L, and the filter residue was washed with water to obtain iron phosphate residue.

[0096] (3) concentrated to obtain lith...

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Abstract

The invention relates to a method for selectively recycling lithium in a waste lithium iron phosphate battery. The core of the method is that the dosage of a medicament is accurately controlled according to the metering number of chemical reaction, lithium is selectively leached under the action of an oxidizing agent, and a pure lithium-rich solution and iron phosphate slag are obtained. The obtained lithium-rich solution can be used for preparing lithium carbonate. The process is simple in treatment flow, mild in operating condition and easy to control, does not introduce other impurities in the treatment process, has the characteristics of low cost, high efficiency and environmental protection, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of resource recovery, and relates to a method for selectively recovering lithium in waste lithium iron phosphate batteries, in particular to an economical and environment-friendly selective recovery method for lithium in waste lithium iron phosphate batteries. Background technique [0002] Lithium iron phosphate batteries are widely used in electric vehicles and energy storage due to their high safety, mature manufacturing technology, low preparation cost, and good cycle performance. field. With the large market investment of lithium iron phosphate power batteries, there will be a huge amount of waste lithium iron phosphate batteries to be disposed of in the future. On the one hand, waste lithium iron phosphate batteries contain organic electrolytes such as lithium hexafluorophosphate. If they are not properly disposed of, they will have adverse effects on atmospheric soil and human health; on the other han...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M10/0525
CPCH01M10/54H01M10/0525Y02E60/10Y02W30/84
Inventor 周智勇王伟胡瑜磊李康李瑞骐张帆田世超任钟旗
Owner 江西悦锂科技有限公司
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