Extraction method of metal ions in lithium ion battery leaching solution by using ionic liquid
A technology of lithium ion battery and ionic liquid, which is applied in the field of extraction and separation of metal ions in leachate of waste nickel cobalt lithium manganate battery cathode sheet, can solve the problems of volatility, toxicity, flammability of extractant, etc., and achieve high extraction capacity and stability good effect
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[0017] Implementation case 1: Ionic liquid extraction-stripping cycle.
[0018] The details are as follows:
[0019] step one:
[0020] Extraction process: Add a certain volume of water to dilute the ionic liquid to reduce the viscosity, take 5 mL of extractant and mix the same volume with the metal ion leaching solution of the lithium battery positive electrode sheet, and shake and mix for 15 minutes at 60 degrees Celsius. In the metal ion leaching solution of the lithium battery positive electrode sheet, the concentration of each metal ion is 4502 ppm for nickel ions, 1782 ppm for cobalt ions, 2846 ppm for manganese ions, and 734 ppm for lithium ions.
[0021] Step two:
[0022] Separation process: Centrifuge for 2 minutes under the condition of 5000 revolutions per minute, layer the extract phase and raffinate phase, and separate the two phases.
[0023] Step three:
[0024] Stripping process: Add a certain volume of water to the extraction phase and mix, shake and mix for 15 minutes ...
Example Embodiment
[0027] Implementation case 2: ionic liquid continuous extraction cycle.
[0028] The details are as follows:
[0029] step one:
[0030] Extraction process: Add a certain volume of water to dilute the ionic liquid to reduce the viscosity, take 5 mL of extractant and mix the same volume with the metal ion leaching solution of the lithium battery positive electrode sheet, and shake and mix for 15 minutes at 60 degrees Celsius. In the metal ion leaching solution of the lithium battery positive electrode sheet, the concentration of each metal ion is 4502 ppm for nickel ions, 1782 ppm for cobalt ions, 2846 ppm for manganese ions, and 734 ppm for lithium ions.
[0031] Step two:
[0032] Separation process: Centrifuge for 2 minutes under the condition of 5000 revolutions per minute, layer the extract phase and raffinate phase, and separate the two phases.
[0033] Step three:
[0034] Cyclic extraction process: Take 5 mL of the extractant in step 2 and mix the same volume with the metal ion le...
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