Method for recycling cobalt and lithium from positive plate of waste lithium ion battery

A technology for lithium ion batteries and positive electrode sheets, which is applied in the field of recovering cobalt and lithium, can solve the problems of high cost, long process flow, difficulty in improving economic benefits and industrialization value, etc., and is suitable for large-scale industrialization and has a simple and easy process. , the effect of considerable economic value

Active Publication Date: 2017-03-15
JINGMEN GEM NEW MATERIAL
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Problems solved by technology

[0003] At present, the method of separating and recovering cobalt and lithium metal from the positive electrode sheet of the waste lithium ion battery is generally to first disassemble the waste lithium ion battery to obtain the positive electrode sheet containing the active material, and then use organic solvents, high temperature or acid-base processes. Separate the aluminum foil to obtain the positive electrode material containing lithium cobaltate, and then sequentially adopt methods such as leaching, chemical precipitation, extraction separation or ion exchange to obtain metal compounds containing cobalt and lithium. This method has a long process flow
[0004] In particular, in the existing lithium recovery methods, the recovery rate of lithium is generally only about 60%, and the purity is relatively low
Especially for spent lithium-ion batteries with high lithium content, the problem is more serious
[0005] To sum up, the current method of recovering cobalt and lithium from the positive electrode sheet of spent lithium-ion batteries has the characteristics of long process flow, large space requirements, and high energy consumption, which leads to low overall recovery efficiency, high cost, and difficulty in improving economic benefits and industrialization. value

Method used

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  • Method for recycling cobalt and lithium from positive plate of waste lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0026] Such as figure 1 As shown, the method for recovering cobalt and lithium from the positive electrode sheet of the waste lithium-ion battery provided by the present embodiment includes the following steps:

[0027] 1. Ammonium sulfate roasting process:

[0028] Mix the positive electrode sheet of the waste lithium battery with ammonium sulfate at a mass ratio of 1:2.5, and then bake at 650°C for 4 hours to obtain reduced roasted slag containing aluminum foil and sulfate containing metal elements such as cobalt and lithium;

[0029] 2. Screening process:

[0030] Using a vibrating sieving machine to sieve the reduced roasted slag while vibrating, separate and remove the aluminum foil, and obtain a reduced slag containing cobalt and lithium. The cobalt content in the reduced slag is 45.4wt.%, and the lithium content is 6.2wt.%.

[0031] 3. Acid leaching process:

[0032] Use 2mol / L dilute sulfuric acid at a liquid-solid ratio of 6:1 (L / kg) to leach the cobalt-lithium-con...

Embodiment 2

[0042] Such as figure 1 As shown, the method for recovering cobalt and lithium from the positive electrode sheet of the waste lithium-ion battery provided by the second embodiment includes the following steps:

[0043] 1. Ammonium sulfate roasting process:

[0044] Mix the positive electrode sheet of the waste lithium battery with ammonium sulfate at a mass ratio of 1:2.0, and then bake at 550°C for 7 hours to obtain reduced roasted slag containing aluminum foil and sulfate containing metal elements such as cobalt and lithium;

[0045] 2. Screening process:

[0046]The reduced roasted slag was sieved while vibrating with a vibrating sieving machine, and the aluminum foil was separated and removed to obtain a reduced slag containing cobalt and lithium. The cobalt content in the reduced slag was 48.9wt.%, and the lithium content was 7.2wt.%.

[0047] 3. Acid leaching process:

[0048] Use 1mol / L dilute sulfuric acid at a liquid-solid ratio of 8:1 (L / kg) to leach the cobalt-li...

Embodiment 3

[0058] Such as figure 1 As shown, the method for recovering cobalt and lithium from the positive electrode sheet of the waste lithium ion battery provided by the present embodiment three includes the following steps:

[0059] 1. Ammonium sulfate roasting process:

[0060] Mix the positive electrode sheet of the waste lithium battery with ammonium sulfate at a mass ratio of 1:2.2, and then bake at 550°C for 6 hours to obtain a reduced roasted slag containing aluminum foil and sulfate containing metal elements such as cobalt and lithium;

[0061] 2. Screening process:

[0062] Using a vibrating sieving machine to sieve the reduced roasted slag while vibrating, separate and remove the aluminum foil, and obtain a reduced slag containing cobalt and lithium. The cobalt content in the reduced slag is 47.3wt.%, and the lithium content is 6.8wt.%.

[0063] 3. Acid leaching process:

[0064] Use 1mol / L dilute sulfuric acid at a liquid-solid ratio of 5:1 (L / kg) to leach the cobalt-lit...

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Abstract

The invention provides a simple and high-efficiency method for recycling cobalt and lithium from a positive plate of a waste lithium ion battery, and relates to a method for recycling cobalt and lithium from the positive plate of the waste lithium ion battery. The method is characterized by comprising the following processes of ammonium sulfate roasting, in which the positive plate of the waste lithium battery is mixed with ammonium sulfate, and high-temperature roasting is performed to obtain reduction roasting slag; screening, in which the reduction roasting slag is vibrated and is screened by a vibration screening machine, and an aluminum foil is separated and removed to obtain reduction slag containing cobalt and lithium; acid leaching, in which the aluminum foil is separated and removed from the reduction roasting slag, is leached in sulfuric acid and is filtered to obtain a sulfate solution containing cobalt and lithium; impurity removal, in which pH of the solution is adjusted by sodium carbonate, and a precipitant is filtered and removed to obtain a lithium-cobalt sulfate mixture solution; cobalt deposition, in which sodium hydroxide is added into the lithium-cobalt sulfate mixture solution, the pH of the solution is controlled to be 7.5-9.5, and filtering is performed to obtain the precipitant, the precipitant is washed with deionized water at 85-95 DEG C, cobalt hydroxide is dried, cobalt hydroxide after being dried is placed in a reduction furnace, and H2 is introduced for reduction to obtain cobalt powder; and lithium deposition, in which pH of a lithium-containing solution is adjusted to 7-8, and an excessive amount of a lithium deposition agent is added to a lithium salt product.

Description

technical field [0001] The invention belongs to the technical field of resource recycling and hydrometallurgy, and in particular relates to a method for recovering cobalt and lithium from positive plates of waste lithium batteries. [0002] technical background [0003] At present, the method of separating and recovering cobalt and lithium metal from the positive electrode sheet of the waste lithium ion battery is generally to first disassemble the waste lithium ion battery to obtain the positive electrode sheet containing the active material, and then use organic solvents, high temperature or acid-base processes. Separate the aluminum foil to obtain the positive electrode material containing lithium cobalt oxide, and then sequentially adopt methods such as leaching, chemical precipitation, extraction separation or ion exchange to obtain metal compounds containing cobalt and lithium. This method has a long process flow. [0004] In particular, in the existing lithium recovery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B7/00C22B26/12B22F9/22
CPCB22F9/22C22B7/007C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 张云河许开华郭苗苗叶建
Owner JINGMEN GEM NEW MATERIAL
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