Method for recycling lithium in waste lithium iron phosphate battery through acid-free extraction

A technology of lithium iron phosphate battery and lithium iron phosphate, which is applied in the direction of recycling by waste collectors, can solve the problems of waste of resources and other problems, and achieve the effects of avoiding waste, short reaction time, and accelerated leaching speed

Pending Publication Date: 2022-07-22
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The recovery rate of metals recovered by the liquid phase recovery technology is relatively high, but acid-base reagents are used in the operation process, and a large amount of water is required for rinsing to remove acid and alkali, and the waste of resources is serious

Method used

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  • Method for recycling lithium in waste lithium iron phosphate battery through acid-free extraction
  • Method for recycling lithium in waste lithium iron phosphate battery through acid-free extraction
  • Method for recycling lithium in waste lithium iron phosphate battery through acid-free extraction

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Effect test

Embodiment 1

[0040] A method for recovering lithium in waste and old lithium iron phosphate batteries by acid-free leaching, comprising the following steps:

[0041] 1) Mix 100g of waste lithium iron phosphate cathode material with a mass fraction of 92% and 300mL of water to make a slurry;

[0042] 2) 3g FeCl 3 , 5.8g of ammonium citrate was added to the slurry in step 1), the temperature of the system was heated to 70°C, and the reaction was filtered for 2 hours to obtain a lithium-containing solution (99.5wt%) and iron phosphate slag;

[0043] 3) rinsing the iron phosphate slag obtained in step 2) with water, and returning the eluent to step 1) for pulping;

[0044] 4) 80g of sodium carbonate and 60mL of lithium-containing solution are mixed and reacted to obtain a lithium carbonate product, the purity of the lithium carbonate product is 98%, the yield is 99.8%, and the selectivity of lithium is 99.5%.

Embodiment 2

[0046] A method for recovering lithium in waste and old lithium iron phosphate batteries by acid-free leaching, comprising the following steps:

[0047] 1) Mix 100 g of waste lithium iron phosphate cathode material with a mass fraction of 92% and 200 mL of water to make a slurry;

[0048] 2) Put 4g of Fe 2 (SO) 4 , 4.8 g of sodium citrate was added to the slurry in step 1), the temperature of the system was heated to 75 ° C, and filtered after 2 h of reaction to obtain a lithium-containing solution (99.0 wt%) and iron phosphate slag;

[0049] 3) rinsing the iron phosphate slag obtained in step 2) with water, and returning the eluent to step 1) for pulping;

[0050] 4) 80 g of potassium carbonate and 60 mL of lithium-containing solution are mixed and reacted to obtain a lithium carbonate product, the purity of the lithium carbonate product is 96.6%, the yield is 99.7%, and the selectivity of lithium is 99.0%.

Embodiment 3

[0052] A method for recovering lithium in waste and old lithium iron phosphate batteries by acid-free leaching, comprising the following steps:

[0053] 1) Mix 100 g of waste lithium iron phosphate cathode material with a mass fraction of 93.1% and 500 mL of water to make a slurry;

[0054] 2) Put 2g of Fe(NO 3 ) 3 , 3 g of potassium iodide was added to the slurry in step 1), the temperature of the system was heated to 80 ° C, and the reaction was filtered after 2 h to obtain a lithium-containing solution (99.5 wt %) and iron phosphate slag;

[0055] 3) rinsing the iron phosphate slag obtained in step 2) with water, and returning the eluent to step 1) for pulping;

[0056] 4) 70 g of potassium carbonate and 60 mL of lithium-containing solution are mixed and reacted to obtain a lithium carbonate product, the purity of the lithium carbonate product is 97.8%, the yield is 99.8%, and the selectivity of lithium is 99.5%.

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Abstract

The invention provides a method for recycling lithium in a waste lithium iron phosphate battery through acid-free extraction, and belongs to the technical field of lithium ion battery material recycling. The method comprises the following steps: adding water into the positive electrode material of the waste lithium iron phosphate battery to prepare slurry, so as to obtain lithium iron phosphate slurry; mixing a metal ion complexing agent, an oxidation auxiliary agent and the lithium iron phosphate slurry for reaction, and filtering to obtain a lithium-containing solution and iron phosphate slag; and the carbonate and the lithium-containing solution are mixed and precipitated to obtain a lithium carbonate product. According to the lithium extraction method, no acid-base reagent needs to be added, environmental pollution and water resource waste are avoided, lithium ions are effectively and accurately separated out through the mutual cooperation effect of the metal ion complexing agent and the oxidation auxiliary agent, the lithium extraction efficiency reaches up to 99.8%, the purity of the lithium carbonate product reaches up to 98%, and lithium carbonate can be directly used.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery material recovery, in particular to a method for recovering lithium in waste lithium iron phosphate batteries by acid-free leaching. Background technique [0002] Waste lithium iron phosphate batteries are rich in metal resources and have potential pollution to the environment. Research on the recycling of waste lithium iron phosphate battery materials has economic and environmental benefits. [0003] At present, the recycling technologies of waste lithium iron phosphate battery cathode materials mainly include solid-phase regeneration and liquid-phase method. Solid-phase regeneration is to regenerate the cathode material separated after pretreatment in a high-temperature protective gas atmosphere to prepare carbon-coated lithium iron phosphate (LFP / C). It is mainly divided into non-oxidative pretreatment regeneration and oxidative pretreatment regeneration. The carbon content of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCH01M10/54
Inventor 白哲李军何洁龙张正裕黄新萍吴佳霓
Owner GUANGDONG UNIV OF TECH
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