Recycling method of waste lithium ion batteries
A lithium-ion battery and recovery method technology, applied in the field of comprehensive recovery of valuable metals using lithium-ion batteries, can solve the problems of inability to achieve high-efficiency priority extraction of lithium, long lithium recovery process, poor cycle effect, etc., to achieve harmless Disposal, high-efficiency priority extraction of lithium, and short process flow
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Embodiment 1
[0032] Get ternary waste lithium battery cell powder 50g, add 4mol / L sulfuric acid, add 20g additive potassium permanganate (KMnO 4 ), selectively leached lithium, and stirred and reacted for 12 hours at 20° C., and then filtered to obtain leaching residue and leaching solution. The leaching solution is a mixed solution containing nickel sulfate, cobalt sulfate, manganese sulfate and lithium sulfate. Adjust the pH value of the leaching solution to 7, remove impurities, and obtain a high-concentration lithium-containing solution with a lithium oxide content of about 50g / L, and then use sodium carbonate to carry out lithium precipitation process to obtain lithium carbonate products.
[0033] The leaching residue was leached with 30% hydrogen peroxide to reduce neutrality, the amount of sulfuric acid added was 0.8 times the theoretical amount, the amount of 30% hydrogen peroxide added was 1 times the theoretical amount, the temperature was 30°C, the reaction was 1 hour, the pH va...
Embodiment 2
[0036] Get ternary waste lithium battery cell powder 50g, add 4mol / L sulfuric acid, add 40g additive potassium permanganate (KMnO 4 ), selectively leached lithium, and stirred and reacted for 2 hours at 50°C, then filtered to obtain a mixed solution containing leached slag and nickel-cobalt-manganese-lithium, adjusted the pH of the filtrate to 8 for impurity removal, and obtained a high-concentration lithium-containing solution, oxidized Lithium content is about 40-50g / L, followed by lithium precipitation process to obtain lithium carbonate product.
[0037]The leaching residue is reduced and leached with hydrogen peroxide, the amount of sulfuric acid added is 0.85 times of the theoretical amount, the amount of 30% hydrogen peroxide added is 1.1 times of the theoretical amount, the temperature is 30 ° C, and the reaction is 1 hour to obtain a high-concentration nickel-cobalt-manganese-containing solution. The pH of the leaching end point is = 4.5-5.2, nickel in nickel-cobalt-m...
Embodiment 3
[0041] Take 50g of ternary waste lithium battery cell powder, add 4mol / L sulfuric acid, add 10g of additive KMnO 4 , selectively leaching lithium, at 80°C, stirring and reacting for 8 hours, then filtering to obtain a mixed solution containing leaching slag and nickel-cobalt-manganese-lithium, adjusting the pH of the filtrate to 9 for impurity removal, and obtaining a high-concentration lithium-containing solution, lithium oxide The content is about 40-50g / L, followed by lithium precipitation process to obtain lithium carbonate product
[0042] The leached residue is leached with hydrogen peroxide reduction, the amount of sulfuric acid added is 0.8 times the theoretical amount, the amount of 30% hydrogen peroxide added is 1 times the theoretical amount, the temperature is 30°C, and the reaction is 1h to obtain a high-concentration nickel-cobalt-manganese-containing solution. The pH of the leaching end point is ≈ 4.5 -5.2, nickel: 55.25g / L, cobalt: 21.25g / L, manganese: 31.45g / L...
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