Recycling method for positive electrode material of waste lithium cobalt oxide battery
A battery cathode and recycling method technology, applied in battery recycling, waste collector recycling, recycling technology, etc., can solve the problems of evaporative crystallization, complex process, unreasonable reaction engineering, etc., to improve the conversion rate and recovery rate , the overall cost reduction, the effect of short process flow
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Embodiment 1
[0037] Take 100g of the positive and negative electrode mixture of lithium cobalt oxide battery (the negative electrode material accounts for 35%), add 42g of ammonium chloride, mechanically activate for 20min, reduce and roast at 500°C, control the CO atmosphere, and react for 3h;
[0038] Add 800ml of water to the roasted product, soak lithium at room temperature for 1.5h, the leaching rate of lithium is 98.46%, and other metals are not dissolved, filter to obtain a lithium-rich solution, the recovery rate of lithium is 96.2%;
[0039] Inject CO into the Li-rich solution 2 , CO 2 The feed rate was 1.5 L / min, reacted at 60°C for 2 hours, and filtered to obtain lithium carbonate with a purity of 99.32% and a lithium precipitation rate of 95.8%.
Embodiment 2
[0041] Take 100g of the positive and negative electrode mixture of lithium cobaltate battery (the negative electrode material accounts for 38%), add 20g of ammonium sulfate, mechanically activate for 10min, reduce and roast at 580°C, control the CO atmosphere, and react for 1.5h;
[0042] Add 600ml of water to the roasted product, soak lithium at room temperature for 2 hours, the leaching rate of lithium is 98.76%, and other metals are not dissolved, filter to obtain a lithium-rich solution, the recovery rate of lithium is 97.8%;
[0043] Inject CO into the Li-rich solution 2 , CO 2 The feed rate was 1 L / min, reacted at 40°C for 2 hours, and filtered to obtain lithium carbonate with a purity of 99.65% and a lithium precipitation rate of 96.4%.
Embodiment 3
[0045]Take 100g of the positive and negative electrode mixture of lithium cobalt oxide battery (the negative electrode material accounts for 45%), add 30g of sodium phosphate, mechanically activate for 15min, reduce and roast at 600°C, control the CO atmosphere, and react for 1h;
[0046] Add 1000ml of water to the roasted product, soak lithium at room temperature for 2 hours, the leaching rate of lithium is 98.34%, and other metals are not dissolved, filter to obtain a lithium-rich solution, the recovery rate of lithium is 95.8%;
[0047] Inject CO into the Li-rich solution 2 , CO 2 The feed rate was 1.5 L / min, reacted at 50°C for 1.5 h, and filtered to obtain lithium carbonate with a purity of 99.27% and a lithium precipitation rate of 95.2%.
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