Method for recovering waste/used lithium iron phosphate positive-pole material by acid leaching method
A technology for recycling and processing lithium iron phosphate, which is applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve the problems that iron phosphate is easy to stay in the solid phase, unfavorable for leaching, and low recovery rate
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[0037] Example 1
[0038] (1) Weigh 50 g of the positive electrode active material of the waste lithium iron phosphate battery and add it to the sulfuric acid solution. According to the stoichiometry of lithium in the raw material, the sulfuric acid excess is 0%. The liquid-solid ratio was controlled to 1.5:1, the leaching temperature was 25°C, and the leaching time was 30 minutes to obtain a suspension. The above suspension was filtered.
[0039] The waste lithium ion battery material processed in this step may be a waste lithium ion battery cathode material after pulverization and purification.
[0040] (2) Oxidation of ferrous ions: adjust the pH of the filtrate to be less than 1, add hydrogen peroxide to oxidize the ferrous ions, the excess hydrogen peroxide is 50%, the oxidation temperature is 45° C., and the reaction is carried out for 1 hour.
[0041] (3) Lithium and iron phosphorus are separated to prepare iron phosphate: LiOH is added to the reaction solution of step (2), t...
Example Embodiment
[0043] Example 2
[0044] (1) Weigh the anode active material 50 of the waste lithium iron phosphate battery and add it to the sulfuric acid solution. According to the stoichiometric calculation of lithium in the raw material, the sulfuric acid excess is 0%. The liquid-solid ratio was controlled to be 1.5:1, the leaching temperature was 60°C, and the leaching time was 100min to obtain a suspension. The above suspension was filtered.
[0045] The waste lithium ion battery material processed in this step may be a waste lithium ion battery cathode material that has been pulverized and purified.
[0046] (2) Oxidation of ferrous ions: adjust the pH of the filtrate to be less than 1, add hydrogen peroxide to oxidize the ferrous ions, the excess hydrogen peroxide is 100%, the oxidation temperature is 45°C, and the reaction is carried out for 5 hours.
[0047] (3) Lithium and iron phosphorus are separated to prepare iron phosphate: LiOH is added to the reaction solution in step (2), pH is ...
Example Embodiment
[0049] Example 3
[0050] (1) Weigh 50 g of the positive electrode active material of the waste lithium iron phosphate battery and add it to the sulfuric acid solution. According to the stoichiometric calculation of lithium in the raw material, the sulfuric acid excess is 100%. The liquid-solid ratio was controlled to 2.5:1, the leaching temperature was 60°C, and the leaching time was 100min to obtain a suspension. The above suspension was filtered.
[0051] The waste lithium ion battery material processed in this step may be a waste lithium ion battery cathode material that has been pulverized and purified.
[0052] (2) Oxidation of ferrous ions: adjust the pH of the filtrate to be less than 1, add hydrogen peroxide to oxidize the ferrous ions, the excess hydrogen peroxide is 100%, the oxidation temperature is 45°C, and the reaction is carried out for 2 hours.
[0053] (3) Preparation of iron phosphate by separation of lithium and iron and phosphorus: LiOH is added to the reaction ...
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