Method for mixed acid leaching and recovery of positive pole materials of waste and old lithium ion batteries

A cathode and waste technology, which is applied in the field of mixed acid leaching and recycling of metal components in waste lithium-ion battery cathode materials, can solve the problems of comprehensive recovery of difficult and valuable metals, high requirements for leaching solution, and complex recovery processes, and has a low threshold for raw materials. , the effect of high leaching efficiency and simple process flow

Active Publication Date: 2017-06-13
BOTREE CYCLING SCI &TECH CO LTD
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Problems solved by technology

[0005] In view of the deficiencies in the existing waste lithium-ion battery recycling technology, including complex recycling process, low recycling efficiency, high requirements for leachate, secondary pollution, and difficulty in comprehensive recovery of valuable metals, the present invention aims to provide a waste lithium battery A mixed acid leaching and recovery method for metal components in ion battery cathode materials, the method can simply and efficiently leach Li and Co ions, and recover high-purity lithium carbonate, cobalt hydroxide, aluminum hydroxide, pure aluminum, etc.

Method used

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  • Method for mixed acid leaching and recovery of positive pole materials of waste and old lithium ion batteries

Examples

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Effect test

Embodiment 1

[0067] Break 200g of lithium battery positive electrode waste into pieces of 10mm×10mm, the drying temperature is 95°C, and the drying time is 3h;

[0068] Table 1 Composition of metal elements in cathode materials of waste lithium-ion batteries

[0069] Metal co Ni Fe mn Al Li Content (wt.%) 15.33 11.27 8.9 7.4 3.05 2.96

[0070] Preleaching the positive electrode waste with nitric acid, sulfuric acid (5vol.%) and citric acid (35vol.%) mixed acid containing hydrogen peroxide and sodium sulfite as reducing agent, and filtering to obtain aluminum foil, pre-separation slag and preleaching solution; the acid The concentration is 3mol / L, the mass percentage of the reducing agent is 5%, the leaching S / L is 100g / L, the leaching temperature is 60°C, the leaching time is 120min, and the stirring speed is 150rpm; the aluminum foil, the pre-separated slag and the pre-separated slag are obtained. Leachate. The obtained aluminum foil is cleaned to obt...

Embodiment 2

[0075] Break 200g of lithium battery positive electrode waste into pieces of 15mm×15mm, the drying treatment temperature is 105°C, and the drying treatment time is 4h;

[0076] Table 2 Composition of metal elements in cathode materials of waste lithium-ion batteries

[0077] Metal co Ni Fe mn Al Li Content (wt.%) 10.31 8.71 7.45 7.01 4.35 3.46

[0078] Use trichloroacetic acid and sulfuric acid (25vol.%) mixed acid containing hydrogen peroxide and sodium sulfite as reducing agent to perform pre-leaching on positive electrode waste, and filter to obtain aluminum foil, pre-separated slag and pre-leaching solution; the acid concentration is 2.5mol / L , the mass percentage of the reducing agent is 3%, the leaching S / L is 80g / L, the leaching temperature is 55°C, the leaching time is 80min, and the stirring speed is 200rpm; aluminum foil, pre-separated slag and preleaching solution are obtained. The obtained aluminum foil is cleaned to obtain a cl...

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Abstract

The invention provides a method for mixed acid leaching and recovery of metal components of positive pole materials of waste and old lithium ion batteries. The method comprises carrying out coarse crushing on wastes, drying the crushed wastes, pre-leaching the wastes through a mixed acid containing a reduction agent to obtain pre-separated residues, carrying out ball milling, carrying out primary and secondary leaching, mixing the primary and secondary leachates and the pre-leachate, adjusting pH of the mixture, carrying out suction filtration to obtain aluminum hydroxide and raffinate containing cobalt and lithium, adjusting pH of the raffinate containing cobalt and lithium at a high temperature, carrying out suction filtration to obtain cobalt hydroxide and raffinate containing lithium, carrying out concentration on the raffinate containing lithium at a high temperature, adding a saturated sodium carbonate solution into the concentrate to obtain high purity lithium carbonate, and recovering aluminum foil. The method utilizes a mixed acid leaching agent, has high leaching efficiency, can gradually acquire high purity aluminum, aluminum hydroxide, cobalt hydroxide and high purity lithium carbonate (having purity of 99.9%), realizes efficient recovery, overall recovery and collaborative recovery of high-value metals in the waste and old lithium-ion batteries and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of recycling of secondary resources and circular economy, and in particular relates to a mixed acid leaching and recovery method of metal components in positive electrode materials of waste lithium ion batteries. Background technique [0002] With the innovation of energy storage and supply methods, the application range of lithium-ion batteries has become more extensive, and its application involves many fields such as electronic products, automobiles, and aerospace. The promotion and use of new lithium-ion batteries has overcome the negative environmental impact brought about by traditional energy supply and storage methods, and reduced the cost of energy storage. However, according to the statistics of the International Technology Federation, the average service life of lithium-ion batteries for mobile power equipment is only 2-3 years, and the average service life of lithium-ion batteries for electric ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 王雪
Owner BOTREE CYCLING SCI &TECH CO LTD
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