Method for leaching valuable metals from batteries using nanobubbles

A nano-bubble and valuable metal technology, used in battery recycling, recycling technology, and process efficiency improvement, can solve problems such as slow reaction rates, improve leaching efficiency, reduce acid usage, and leaching effects. significant effect

Active Publication Date: 2022-03-01
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reaction rate of the traditional acid leaching method is not fast, and it usually takes 2-5 hours to achieve a leaching rate of more than 95%.

Method used

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  • Method for leaching valuable metals from batteries using nanobubbles
  • Method for leaching valuable metals from batteries using nanobubbles
  • Method for leaching valuable metals from batteries using nanobubbles

Examples

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Embodiment 1

[0094] A method for leaching valuable metals from batteries using nanobubbles, achieved through the following steps:

[0095] (1) Simple preprocessing:

[0096] Fully discharge the decommissioned lithium-ion battery, manually disassemble and remove the shell in the glove box, separate the diaphragm and negative electrode, and take out the positive electrode sheet (that is, the positive electrode material); dry the positive electrode sheet to make the organic solvent such as the electrolyte volatilize, this process does not require complicated procedures Pretreatment process before leaching.

[0097] (2) Preparation of nanobubbles:

[0098] Pour deionized water into the mechanical stirring equipment, and pass through oxygen for 5 minutes to exhaust the air in the equipment. Close the air outlet, turn on the stirring, and set the blade to rotate rapidly for 10 minutes. After stirring, the aqueous solution containing oxygen nanobubbles (the zeta potential is about -70mV) is po...

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Abstract

The invention provides a method for using nanobubbles to leach valuable metals from batteries, comprising: using a leaching agent to leach battery materials, wherein heating and stirring are carried out during the leaching process, and the leaching agent contains inorganic acid, A reducing agent and a liquid mixed with nanobubbles; wherein the diameter of the nanobubbles is no more than 1000nm; the Zeta potential of the liquid mixed with nanobubbles is no more than -30mV; the zeta potential of the leaching agent is no more than -20mV; The concentration of the inorganic acid is 0.2-4 mol / L; the concentration of the reducing agent is 0.2-2 mol / L. Compared with the traditional acid leaching method, the leaching efficiency of the present invention is high, and the leaching capacity is large. The traditional acid leaching method needs several hours to achieve a leaching rate of more than 95%, while the present invention can greatly improve the leaching efficiency . The invention can avoid the use of inorganic reducing agent, and reduces the damage of the solvent to the environment and the influence on the human body after leaching.

Description

technical field [0001] The invention relates to the technical field of battery material recovery, in particular to a method for using nanobubbles to leach valuable metals from batteries. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, small size, high energy density, no memory effect, long life, and wide operating temperature range, so they are widely used in portable electronic devices such as mobile phones, mobile power supplies, and notebooks. At the same time, with the continuous development of the new energy automobile industry, the market demand for lithium-ion batteries is also expanding. As the demand for lithium-ion batteries continues to increase, the number of decommissioned lithium batteries will inevitably increase. It is estimated that by 2023, the annual scrapping of lithium-ion batteries will reach 101GWh, about 1.16 million tons per year. Decommissioned lithium batteries contain a large amount of heavy met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B26/12C22B47/00H01M10/54C22B23/00
CPCC22B7/007C22B26/12C22B23/0415C22B47/00H01M10/54Y02W30/84Y02P10/20
Inventor 顾帅邢雷于建国
Owner EAST CHINA UNIV OF SCI & TECH
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