Method for selectively recycling lithium from lithium iron phosphate waste
A lithium iron phosphate and lithium recovery technology, applied in the field of selective lithium recovery, can solve the problems of increasing the difficulty of high-purity lithium products, and achieve the effects of low reagent cost, short process and mild reaction conditions
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Embodiment 1
[0016] Add 158g of expired lithium iron phosphate cathode powder into water to make slurry, then add 0.6mol sodium persulfate to the aqueous solution and perform mechanical stirring. The reaction conditions are controlled as follows: solid-liquid ratio 1:2kg / L, reaction temperature 25°C, The time is 1 hour, and the pH is about 2.5 during the process, without adding acid or alkali to control. After the reaction was completed, the lithium-containing aqueous solution and iron phosphate solid were obtained by filtration. The concentration of lithium in the solution was 21.9 g / L, and the leaching rate was 99.3%. Add 200g / L Na to the leaching solution 2 CO 3 The solution is subjected to lithium precipitation, and the precipitate is filtered, washed and dried to obtain white crystals, and the purity of lithium carbonate reaches 99.5%.
Embodiment 2
[0018] Discharge and crush the used lithium iron phosphate battery soft pack, weigh 1000g (containing 289g of lithium iron phosphate powder) and add it into water to make slurry, then inject oxygen into the aqueous solution, and carry out mechanical stirring. The reaction conditions are controlled as follows: oxygen flow rate 1L / min, solid-liquid ratio 1:1.5kg / L, reaction temperature 38°C, time 10 hours, pH 10.0 or so. After the reaction was completed, the lithium-containing aqueous solution and iron phosphate solid were obtained by filtration. The concentration of lithium in the solution was 8.4g / L, and the leaching rate was 98.4%. After heating and evaporating the leaching solution to increase the concentration of lithium in it, CO is introduced 2 Lithium precipitation is carried out, and the precipitate is filtered, washed, and dried to obtain white crystals, and the purity of lithium carbonate reaches 99.6%.
Embodiment 3
[0020] Break the waste lithium iron phosphate positive electrode sheet to less than 1cm, weigh 800g (containing 450g of lithium iron phosphate) and add it into water to make slurry, then pass ozone into the aqueous solution, and carry out mechanical stirring. The reaction conditions are controlled as follows: ozone flow rate 1mol / h. The solid-to-liquid ratio is 1:5kg / L, the reaction temperature is 50°C, the reaction time is 5 hours, and the pH is about 11.0. After the reaction was completed, the lithium-containing aqueous solution and iron phosphate solid were obtained by filtration. The concentration of lithium in the solution was 4.9 g / L, and the leaching rate was 98.3%. The leaching solution is heated and evaporated, and the crystallized product obtained is a product containing 98.6% of lithium hydroxide after being filtered, washed and dried.
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