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Method for removing fluorine in lithium battery positive electrode lixivium

A leachate and lithium battery technology, which is applied in the field of waste battery recycling, can solve the problems of poor quality of precursor products, shortening the service life of equipment, and substandard wastewater, and achieve the effect of large fluorine removal capacity, avoiding losses, and improving quality

Active Publication Date: 2022-03-22
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are also a series of problems in this process: 1) a part of fluorine will enter into the nickel-cobalt-manganese solution during extraction, causing the quality of the subsequent synthesized precursor product to be unqualified; 2) fluorine will cause subsequent degreasing and COD of the raffinate 3) The presence of fluorine will cause corrosion to the equipment and shorten the service life of the equipment

Method used

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  • Method for removing fluorine in lithium battery positive electrode lixivium
  • Method for removing fluorine in lithium battery positive electrode lixivium

Examples

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Embodiment 1

[0030] A method for removing fluorine in lithium battery cathode leaching solution, with reference to figure 1 , the specific process is:

[0031] (1) Pretreatment: disassemble, crush, sort and sieve the waste lithium battery after discharge to obtain battery powder and aluminum slag;

[0032] (2) Preparation of frasonite defluorinating agent: based on (1), after the aluminum slag is finely broken, cross a 100-mesh sieve to obtain the aluminum slag powder, and the aluminum slag powder obtained and 10% sodium hydroxide solution are mixed according to solid Liquid ratio 1: 5g / mL mixed, stirred and reacted at 80°C for 60min, after the reaction, filtered the solution to obtain insoluble slag and sodium metaaluminate solution, the insoluble slag was transferred to step (3) for acid leaching to dissolve, sodium metaaluminate The solution was fed with carbon dioxide gas, the reaction temperature was 40°C, and the stirring rate was 150rpm, until the pH in the solution was stabilized ...

Embodiment 2

[0039] A method for removing fluorine in the leach solution of the positive electrode of a lithium battery, the specific process is:

[0040] (1) Pretreatment: disassemble, crush, sort and sieve the waste lithium battery after discharge to obtain battery powder and aluminum slag;

[0041] (2) Preparation of frasonite defluorinating agent: based on (1), aluminum slag is crossed through a 100-mesh sieve after being finely broken to obtain aluminum slag powder, and the obtained aluminum slag powder is mixed with 30% sodium hydroxide solution according to solid Mix liquid ratio 1:3g / mL, stir and react at 50°C for 30min, after the reaction, filter the solution to obtain insoluble slag and sodium metaaluminate solution, transfer the insoluble slag to step (3) for acid leaching to dissolve, sodium metaaluminate The solution is fed with carbon dioxide gas, the reaction temperature is 60°C, and the stirring rate is 350rpm, until the pH in the solution is stable at 6.5, then stop stirri...

Embodiment 3

[0048] A method for removing fluorine in the leach solution of the positive electrode of a lithium battery, the specific process is:

[0049] (1) Pretreatment: disassemble, crush, sort and sieve the waste lithium battery after discharge to obtain battery powder and aluminum slag;

[0050] (2) Preparation of frasonite defluorinating agent: based on (1), after the aluminum slag is finely broken, cross a 100-mesh sieve to obtain aluminum slag powder, and the aluminum slag powder obtained and 20% sodium hydroxide solution are mixed according to solid Mix liquid ratio 1:4g / mL, stir and react at 60°C for 40min, after reaction, filter the solution to obtain insoluble slag and sodium metaaluminate solution, transfer the insoluble slag to (3) for acid leaching to dissolve, sodium metaaluminate solution Then pass in carbon dioxide gas, wherein the reaction temperature is 50°C, and the stirring rate is 200rpm, until the pH in the solution is stable at 6.0, stop stirring, age the solution...

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Abstract

The method comprises the following steps: adding acid and an oxidizing agent into battery powder for leaching, removing impurities from the obtained leaching solution to obtain a fluorine-containing solution, adding dawsonite into the fluorine-containing solution, simultaneously adding sulfuric acid, carrying out stirring reaction at a certain temperature, and carrying out solid-liquid separation to obtain a fluorine-removed solution and filter residues, and washing filter residues to obtain crude sodium hexafluoroaluminate. According to the method disclosed by the invention, the dawsonite is used for removing fluorine from the waste lithium battery, is good in selectivity, does not react with nickel, cobalt, manganese, lithium and the like in the solution, and only reacts with fluorine ions in the solution, so that the purpose of selectively removing fluorine is achieved, and the loss of nickel, cobalt, manganese and lithium metals in the solution is avoided; according to the fluorine removal reaction equation, one mole of aluminum can be combined with six moles of fluorine, the fluorine removal capacity is large, sodium ions in the solution are consumed during fluorine removal, the concentration of the sodium ions in the solution is reduced, and the quality of the nickel cobalt manganese sulfate solution product is improved.

Description

technical field [0001] The invention belongs to the technical field of recycling waste batteries, and in particular relates to a method for removing fluorine in the leachate of the positive electrode of a lithium battery. Background technique [0002] Due to its high energy density, long cycle life, no memory effect, high rated voltage, and low self-discharge rate, lithium batteries have been widely used in mobile phones, notebook computers, and new energy vehicles, and are known as the future of energy storage batteries. Direction of development. With the continuous development of the global economy, the demand for lithium batteries will further increase. It is estimated that the growth rate of global lithium battery production will remain above 10% per year. However, lithium batteries have a service life. According to statistics, the total number of discarded lithium batteries in the world will exceed 25 billion in 2020, with a quality of 500,000 tons. Therefore, the rec...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/12C22B23/00C22B47/00C01F7/54H01M10/54
CPCC22B7/007C22B26/12C22B23/0461C22B23/0415C22B47/00C01F7/54H01M10/54C01P2006/80Y02P10/20Y02W30/84
Inventor 欧阳石保李长东乔延超陈若葵阮丁山蔡勇
Owner GUANGDONG BRUNP RECYCLING TECH
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