Method for recovering valuable metal from positive electrode material containing binder and valuable metal

A cathode material and valuable metal technology, applied in the field of lithium-ion batteries, can solve the problems of high cost, the need for matching organic solvent recovery facilities, the installation of matching waste gas treatment facilities, the viscosity of organic solvents, etc., to achieve easy promotion, inhibition of high temperature decomposition, The effect of mature equipment

Pending Publication Date: 2021-12-28
贵州中伟资源循环产业发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat treatment method uses high-temperature pyrolysis to decompose the binder in the positive electrode active powder to achieve the purpose of separation. Although this method can effectively remove the residual conductive agent and binder, the high-temperature treatment has high energy consumption and produces Exhaust gas needs to be installed with supporting exhaust gas treatment facilities and other issues; the organic solvent method uses an organic solvent with excellent binder solubility to soak the positive electrode active powder, and then separates the binder from the positive electrode active powder after filtration. The filtration speed is slow when the positive electrode active powder is separated, and the high cost needs to be equipped with organic solvent recovery facilities, etc., which limit its further industrial application

Method used

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  • Method for recovering valuable metal from positive electrode material containing binder and valuable metal
  • Method for recovering valuable metal from positive electrode material containing binder and valuable metal

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Embodiment 1

[0072] see figure 1 , the present embodiment provides a method for recovering valuable metals from a positive electrode material containing a binder, which specifically includes the following steps:

[0073] 1) Weigh 100.13g of the above powder and place it in a reaction kettle, add 65mL of concentrated sulfuric acid at a flow rate of 0.78L / h while stirring and mix evenly (wet mud).

[0074] 2) Close the reaction kettle, raise the temperature to 105°C and let stand for 2h.

[0075] 3) Turn off the heating and turn on the stirring, add 550mL of pure water for slurrying, in the system after slurrying, the concentration of concentrated sulfuric acid is 2mol / L, and the liquid-solid ratio is 6ml:1g;

[0076] Then add 50g of 30wt% hydrogen peroxide, pass nitrogen gas to exhaust the air in the reactor and adjust the pressure of the reactor to 0.5MPa, then start to heat up, heat up to 105°C, and keep the reaction for 2h.

[0077] 4) After the reaction is completed, the temperature o...

Embodiment 2

[0080] This embodiment provides a method for recovering valuable metals from a positive electrode material containing a binder, which specifically includes the following steps:

[0081] 1) Weigh 200.28g of the above powder and place it in a reaction kettle, add 135mL of concentrated sulfuric acid at a flow rate of 0.8L / h while stirring and mix evenly (wet mud).

[0082] 2) Close the reaction kettle, raise the temperature to 105°C and let stand for 2h.

[0083] 3) Turn off the heating and turn on the stirring, add 950mL pure water for slurrying, in the system after slurrying, the concentration of concentrated sulfuric acid is 2.4mol / L, and the liquid-solid ratio is 5.25ml:1g;

[0084] Then 104g of 30wt% hydrogen peroxide was added, nitrogen gas was introduced to exhaust the air in the reactor, and the pressure of the reactor was adjusted to 0.7MPa, then the temperature was raised, and the temperature was raised to 115° C., and the reaction was kept for 2 hours.

[0085] 4) Aft...

Embodiment 3

[0088] This embodiment provides a method for recovering valuable metals from a positive electrode material containing a binder, which specifically includes the following steps:

[0089] 1) Weigh 200.61g of the above powder and place it in a reaction kettle, add 135mL of concentrated sulfuric acid at a flow rate of 0.8L / h while stirring and mix evenly (wet mud).

[0090] 2) Close the reaction kettle, raise the temperature to 120°C and let it stand for 1 hour.

[0091] 3) Turn off the heating and turn on the stirring, add 950mL pure water for slurrying, in the system after slurrying, the concentration of concentrated sulfuric acid is 2.4mol / L, and the liquid-solid ratio is 5.25ml:1g;

[0092] Then 104g of 30wt% hydrogen peroxide was added, nitrogen gas was introduced to exhaust the air in the reactor, and the pressure of the reactor was adjusted to 0.8MPa, then the temperature was raised, and the temperature was raised to 115° C., and then the reaction was kept for 2 hours.

[...

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Abstract

The invention provides a method for recovering valuable metal from a positive electrode material containing a binder and the valuable metal, and relates to the field of lithium ion batteries. The method for recovering the valuable metal from the positive electrode material containing the binder comprises the following steps that the positive electrode material containing the binder is mixed with concentrated sulfuric acid, curing is conducted, and then the system and water are pulpified; and hydrogen peroxide is added into the pulpified system, then pressure leaching is conducted under the protective atmosphere, and then solid-liquid separation is conducted to obtain a valuable metal leachate. The valuable metal is prepared by using the method for recovering the valuable metal from the positive electrode material containing the binder. According to the method for recovering the valuable metal from the positive electrode material containing the binder, the leaching rate of the valuable metal can be effectively increased, safety is high, equipment is mature, operation is easy, and popularization is easy.

Description

technical field [0001] The present application relates to the field of lithium ion batteries, in particular to a method for recovering valuable metals from a positive electrode material containing a binder and the valuable metals. Background technique [0002] Cobalt and nickel are one of the key raw materials of lithium batteries. Recycling of decommissioned ternary lithium batteries is of great significance to solve the resources required for lithium battery manufacturing and alleviate the plight of key mineral resources being controlled by others. It also brings environmental and social benefits. . [0003] At present, the mainstream process of lithium battery recycling is mainly fire process and wet process. The wet process is to disassemble the battery case first, and then obtain the positive electrode active powder after crushing and screening, and leaching the valuable metals in the acid solution. A leaching solution rich in valuable metals is obtained, but the binde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/12C22B23/00C22B47/00H01M10/54
CPCC22B7/007C22B26/12C22B23/043C22B47/00H01M10/54Y02P10/20Y02W30/84
Inventor 张勤俭肖超李攀赵思佳罗进爱邓海龙王磊
Owner 贵州中伟资源循环产业发展有限公司
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