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Method for recycling iron phosphate and lithium carbonate from lithium iron phosphate waste

A technology of lithium iron phosphate and iron phosphate, which is applied in the field of battery waste resource recycling, can solve the problems of large consumption of reagents, complicated process steps, and many process steps, and achieves high product value, low reagent consumption, and simple projection system. Effect

Active Publication Date: 2017-02-22
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for reclaiming iron phosphate and lithium carbonate from lithium iron phosphate waste, which can solve the problems of complicated process steps, many process steps, large reagent consumption, high cost and low recovery rate in the prior art. question

Method used

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  • Method for recycling iron phosphate and lithium carbonate from lithium iron phosphate waste

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Experimental program
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Effect test

Embodiment 1

[0028] Step 1, oxidation roasting: put the tray containing 1 kg of discarded lithium iron phosphate positive electrode into the roasting furnace, heat to 450 ° C, and roast for 3.5 hours to make the binder PTFE invalid and the conductive agent carbon black to volatilize, take out the tray, Obtain the positive electrode piece calcined material containing lithium iron phosphate active material and current collector aluminum foil, wherein the reaction principle is: 6LiFePO 4 +3 / 2O 2 =2Li 3 Fe 2 (PO 4 ) 3 +Fe 2 o 3 ;

[0029] Step 2, pole piece cleaning: put the positive pole piece baked in step 1 into an ultrasonic cleaning tank after it is cooled to 25°C, and after ultrasonic cleaning for 30 minutes, take out the aluminum foil for recovery (at this time, the positive electrode material on the aluminum foil has completely fallen off), filter The lithium iron phosphate active material in the cleaning solution is used for standby, and the filtrate is circulated as the cleani...

Embodiment 2

[0034] Step 1, oxidation roasting: Put the tray containing 1 kg of discarded lithium iron phosphate positive electrode into the roasting furnace, heat to 400°C, and roast for 3.5 hours to make the binder PTFE invalid, and the conductive agent carbon black volatilize, take out the tray, Obtain the positive electrode plate roasting material containing lithium iron phosphate active material and current collector aluminum foil;

[0035] Step 2, pole piece cleaning: put the positive pole piece baked in step 1 into an ultrasonic cleaning tank after it is cooled to 25°C, and after ultrasonic cleaning for 30 minutes, take out the aluminum foil for recovery (at this time, the positive electrode material on the aluminum foil has completely fallen off), filter The lithium iron phosphate active material in the cleaning solution is used for standby, and the filtrate is circulated as the cleaning solution for the next batch of materials;

[0036] Step 3: Add phosphoric acid ball milling to ...

Embodiment 3

[0040] Step 1, oxidation roasting: Put the tray containing 1 kg of discarded lithium iron phosphate positive electrode into the roasting furnace, heat to 500 ° C, and roast for 4 hours to make the binder PTFE invalid, the conductive agent carbon black volatilize, take out the tray, and get Positive plate firing material containing lithium iron phosphate active material and current collector aluminum foil;

[0041] Step 2, pole piece cleaning: put the positive pole piece baked in step 1 into an ultrasonic cleaning tank after it is cooled to 25°C, and after ultrasonic cleaning for 60 minutes, take out the aluminum foil for recovery (at this time, the positive electrode material on the aluminum foil has completely fallen off), filter The lithium iron phosphate active material in the cleaning solution is used for standby, and the filtrate is circulated as the cleaning solution for the next batch of materials;

[0042] Step 3, positive electrode material plus phosphoric acid ball m...

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Abstract

The invention discloses a method for recycling iron phosphate and lithium carbonate from lithium iron phosphate waste. The method comprises the following specific steps: (I) oxidizing roasting; (II) carrying out pole piece cleaning; (III) adding phosphoric acid and performing ball-milling activation; (IV) performing acid pickling to separate FePO4; and (V) precipitating lithium of the filtrate to obtain a target object Li2CO3. The method disclosed by the invention has the following advantages: the P, Fe and Li resources in the lithium iron phosphate waste can be fully utilized to prepare iron phosphate and lithium carbonate products with high added value, no waste of Fe is generated, the resource recycling rate is high, the technological process is short, the reaction system is simple, a few raw materials are consumed, the cost is low, the product value is high, and the method is very suitable for industrial scale production.

Description

technical field [0001] The invention belongs to the technical field of battery waste resource recovery and utilization, and relates to a method for recovering iron phosphate and lithium carbonate from lithium iron phosphate waste. Background technique [0002] In recent years, with the rapid development of the new energy vehicle industry, the output of lithium-ion power batteries has exploded. Lithium iron phosphate lithium ion power battery is highly respected by electric vehicles, energy storage power stations and other industries due to its excellent safety, stability and cycle performance, low price and no pollution. With the widespread use of lithium iron phosphate power batteries, a large number of lithium iron phosphate batteries will gradually be scrapped. Especially in the past two years, the price of lithium salts has soared. How to recycle the scrapped lithium-ion batteries has become a common concern of the society. [0003] At present, there are two main types ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 许开华张云河
Owner JINGMEN GEM NEW MATERIAL
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