Method for recovering cobalt and lithium from waste lithium ion batteries
A technology of lithium-ion batteries and positive plates, which is applied in the field of waste metal recycling technology, can solve the problems of environmental secondary pollution, etc., and achieve the effect of low equipment requirements, short process flow, and no secondary pollution
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[0026] Example 1:
[0027] Weigh the waste LiCoO according to the mass ratio of 1:4.5:4.5 2 2g of powder, sodium bisulfate, potassium bisulfate mixture, thoroughly mixed, placed in a crucible, baked at 700°C for 2 hours, and leached out the material in the crucible with water at 50°C for 10 minutes. Under the condition of 50℃, add 0.2mol / l sodium oxalate solution to the leachate obtained in the previous step. The precipitate is washed and dried at 120℃ for 2 hours to obtain cobalt oxalate CoC 2 O 4 . At 95℃, add 0.5mol / l sodium carbonate solution to the cobalt-precipitated leaching solution. The resulting precipitate is washed and dried at 120℃ for 2 hours to obtain lithium carbonate Li 2 CO 3 . The recovery rate of cobalt in the whole process is 99.99%, and the recovery rate of Li is 98.5%.
Example Embodiment
[0028] Example 2:
[0029] Weigh the waste LiCoO according to the mass ratio of 1:4.5:4.5 2 2g of powder, sodium bisulfate, potassium bisulfate mixture, thoroughly mixed, placed in a crucible, baked at 700°C for 1 hour, and leached the material in the crucible with water at 50°C for 10 minutes. At 50℃, add 0.2mol / l sodium oxalate solution to the leachate obtained in the previous step. The precipitate is washed and dried at 120℃ for 2 hours to obtain cobalt oxalate CoC 2 O 4 . Under the condition of 95℃, 0.5mol / l sodium carbonate solution was added to the leaching solution after cobalt precipitation. The resulting precipitate was washed and dried at 120℃ for 2 hours to obtain lithium carbonate Li 2 CO 3 . The recovery rate of cobalt in the whole process is 99.99%, and the recovery rate of Li is 98.5%.
Example Embodiment
[0030] Example 3:
[0031] Weigh the waste LiCoO according to the mass ratio of 1:4.5:4.5 2 2g of powder, sodium bisulfate, potassium bisulfate mixture, thoroughly mixed, placed in a crucible, baked at 700°C for 0.5 hours, and leached out the material in the crucible with water at 50°C for 10 minutes. Under the condition of 50℃, add 0.2mol / l sodium oxalate solution to the leachate obtained in the previous step. The precipitate is washed and dried at 120℃ for 2 hours to obtain CoC 2 O 4 . At 95℃, add 0.5mol / l sodium carbonate solution to the cobalt-precipitated leaching solution. The resulting precipitate is washed and dried at 120℃ for 2 hours to obtain lithium carbonate Li 2 CO 3 . The recovery rate of cobalt in the whole process is 99.99%, and the recovery rate of Li is 98.5%.
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