Extraction method of metal ions in lithium ion battery leaching solution by using ionic liquid

Abstract

The invention belongs to the technical field of recycling and reusing of waste cathode materials for lithium ion batteries. The invention provides a green extraction and separation method based on ionic liquids to realize the extraction and separation of metal ions in a leaching solution of waste nickel-cobalt manganic acid lithium battery anode pieces. The extraction method of the metal ions in alithium ion battery leaching solution by using the ionic liquids comprises the steps of extraction, separation, back extraction and the like to realize the extraction and the separation of the metalions in the waste lithium ion battery leaching solution without adding organic solvent diluents. The extraction agent has good stability, can be recycled for many times and has a high extraction capacity.

Description

technical field

[0001] The invention belongs to the technical field of recovery and reuse of positive electrode materials of waste lithium-ion batteries, and relates to a method for extracting and separating metal ions in leachate of positive plates of waste nickel-cobalt-lithium-manganese-oxide batteries based on extraction and separation of green solvent ionic liquids. Background technique

[0002] With the adjustment of the global energy structure and the development of electronic information and other technologies, various electronic devices such as mobile phones, notebook computers, and new energy vehicles basically require lithium batteries. The output of lithium batteries in my country in 2010 was 2.687 billion. With the rapid development of new energy vehicles, especially pure electric vehicles, the national output of lithium batteries reached 13.987 billion in 2018. Due to the inevitable capacity decay caused by the increase in the number of charge and discharge dur...

Examples

Embodiment example 1

[0017] Implementation case 1: ionic liquid extraction-stripping cycle.

[0018] The specific content is as follows:

[0019] step one:

[0020] Extraction process: add a certain volume of water to the ionic liquid to dilute and reduce the viscosity, take 5mL of the extractant and mix the same volume with the metal ion leachate of the lithium battery positive plate, and shake and mix for 15 minutes at 60 degrees Celsius. In the metal ion leaching solution of the positive plate of the lithium battery, 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 at 5000 rpm for 2 minutes, separate the extract phase and the raffinate phase, and separate the two phases.

[0023] Step three:

[0024] Back-extraction process: add a certain volume of water to the extraction phase and mix, shake and mix for 15 minutes at 60 degrees Cels...

Embodiment example 2

[0027] Implementation Case 2: Ionic Liquid Continuous Extraction Cycle.

[0028] The specific content is as follows:

[0029] step one:

[0030] Extraction process: add a certain volume of water to the ionic liquid to dilute and reduce the viscosity, take 5mL of the extractant and mix the same volume with the metal ion leachate of the lithium battery positive plate, and shake and mix for 15 minutes at 60 degrees Celsius. In the metal ion leaching solution of the positive plate of the lithium battery, 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 at 5000 rpm for 2 minutes, separate the extract phase and the raffinate phase, and separate the two phases.

[0033] Step three:

[0034] Circular extraction process: Take 5mL of the extractant in step 2 and mix it with the metal ion leaching solution of the positive plat...

technical field

[0001] The invention belongs to the technical field of recovery and reuse of positive electrode materials of waste lithium-ion batteries, and relates to a method for extracting and separating metal ions in leachate of positive plates of waste nickel-cobalt-lithium-manganese-oxide batteries based on extraction and separation of green solvent ionic liquids. Background technique

[0002] With the adjustment of the global energy structure and the development of electronic information and other technologies, various electronic devices such as mobile phones, notebook computers, and new energy vehicles basically require lithium batteries. The output of lithium batteries in my country in 2010 was 2.687 billion. With the rapid development of new energy vehicles, especially pure electric vehicles, the national output of lithium batteries reached 13.987 billion in 2018. Due to the inevitable capacity decay caused by the increase in the number of charge and discharge dur...

Examples

Embodiment example 1

[0017] Implementation case 1: ionic liquid extraction-stripping cycle.

[0018] The specific content is as follows:

[0019] step one:

[0020] Extraction process: add a certain volume of water to the ionic liquid to dilute and reduce the viscosity, take 5mL of the extractant and mix the same volume with the metal ion leachate of the lithium battery positive plate, and shake and mix for 15 minutes at 60 degrees Celsius. In the metal ion leaching solution of the positive plate of the lithium battery, 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 at 5000 rpm for 2 minutes, separate the extract phase and the raffinate phase, and separate the two phases.

[0023] Step three:

[0024] Back-extraction process: add a certain volume of water to the extraction phase and mix, shake and mix for 15 minutes at 60 degrees Cels...

Embodiment example 2

[0027] Implementation Case 2: Ionic Liquid Continuous Extraction Cycle.

[0028] The specific content is as follows:

[0029] step one:

[0030] Extraction process: add a certain volume of water to the ionic liquid to dilute and reduce the viscosity, take 5mL of the extractant and mix the same volume with the metal ion leachate of the lithium battery positive plate, and shake and mix for 15 minutes at 60 degrees Celsius. In the metal ion leaching solution of the positive plate of the lithium battery, 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 at 5000 rpm for 2 minutes, separate the extract phase and the raffinate phase, and separate the two phases.

[0033] Step three:

[0034] Circular extraction process: Take 5mL of the extractant in step 2 and mix it with the metal ion leaching solution of the positive plat...

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