Method for recovering lithium from waste lithium battery to prepare battery grade lithium carbonate

A waste battery and battery-level technology, applied in battery recycling, waste collector recycling, lithium carbonate; The problem of high impurities in the product can achieve the effect of main lithium concentration, small loss of other metal elements, and high lithium recovery rate

Inactive Publication Date: 2017-03-15
GANFENG LITHIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the technical research on lithium recovery from lithium battery waste is still immature. There are mainly two methods reported in domestic and foreign literature and patents: (1) The existing technology is to leaching lithium-containing powder in acid, extracting impurities, and extracting After nickel, cobalt and manganese, sodium carbonate is used to precipitate lithium in the extract solution. The disadvantage is high energy consumption and low lithium recovery rate (less than 60%)
The main problem of this method is that when fluoride is deposited into lithium, nickel, cobalt and manganese will also precipitate out, and the obtained lithium fluoride product has many impurities, low product quality, and low total yield of lithium.
[0005] How to solve the problems of low lithium recovery rate, large loss of nickel, cobalt and manganese and high impurities in lithium products in the recycling of lithium waste batteries is the main difficulty in the current research on lithium extraction from lithium waste batteries, and it is also the technical problem mainly solved by the patent of the present invention

Method used

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  • Method for recovering lithium from waste lithium battery to prepare battery grade lithium carbonate
  • Method for recovering lithium from waste lithium battery to prepare battery grade lithium carbonate

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Experimental program
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Effect test

Embodiment 1

[0055] A. Battery dismantling: Lithium-containing powder is separated from waste lithium batteries through discharge, dismantling, sorting, crushing and other processes;

[0056] B. Acidizing leaching: 100Kg of lithium-containing powder (Li% 7.1%) obtained in step A was adjusted into a slurry with 200Kg of pure water, and then 357Kg of 31% hydrochloric acid and 35Kg of 50% hydrogen peroxide were added to the slurry, and then the Leach for 30 minutes, obtain leachate and acid leaching residue after pressure filtration;

[0057] C. Remove iron and aluminum: add calcium carbonate to the leaching solution obtained in step B, adjust the pH of the solution to 4.5, obtain 550.0L iron and aluminum filtrate after pressure filtration (the analysis of Li in the filtrate is 12.7g / l);

[0058] D. Lithium fluoride precipitation: Add 42.7kg of 98.0% (wt%) sodium fluoride to the iron-removing aluminum filtrate obtained in step C, stir and react at room temperature for 30min, control the pH ...

Embodiment 2

[0063] A. Battery dismantling: Lithium-containing powder is separated from waste lithium batteries through discharge, dismantling, sorting, crushing and other processes;

[0064] B. Acidizing leaching: adjust 100Kg of lithium-containing powder (Li% 6.5%) obtained in step A into a slurry with 500Kg of pure water, then add 163Kg of 98% sulfuric acid and 42Kg of 50% hydrogen peroxide to the slurry, and then Leach for 30 minutes, obtain leachate and acid leaching residue after pressure filtration;

[0065] C. Iron and aluminum removal: Add unslaked lime to the leaching solution obtained in step B, adjust the pH of the solution to 5.0, and obtain 600.0L of iron and aluminum filtrate after pressure filtration (the Li in the analysis filtrate is 10.6 g / l);

[0066] D. Lithium fluoride precipitation: Add 36.5kg of 55.0% (wt%) hydrofluoric acid to the iron-removing aluminum filtrate obtained in step C, stir and react at room temperature for 60min, control the pH of the reaction syste...

Embodiment 3

[0071] A. Battery dismantling: Lithium-containing powder is separated from waste lithium batteries through discharge, dismantling, sorting, crushing and other processes;

[0072] B. Acidizing leaching: 100Kg of lithium-containing powder (Li% 6.8%) obtained in step A was adjusted into a slurry with 400Kg of pure water, and then 377Kg of 65% nitric acid and 66Kg of 50% hydrogen peroxide were added to the slurry, and then the Leach for 45min, obtain leachate and acid leaching residue after pressure filtration;

[0073] C. Iron removal and aluminum removal: add calcium hydroxide to the leaching solution obtained in step B, adjust the pH of the solution to 6.0, obtain 800.0L iron and aluminum filtrate after pressure filtration (the Li in the analysis filtrate is 8.3g / l);

[0074] D. Lithium fluoride precipitation: Add 67.4kg of 98.0% (wt%) potassium fluoride to the iron-removing aluminum filtrate obtained in step C, stir and react at room temperature for 30min, control the pH of ...

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Abstract

The invention discloses a method for recovering lithium from a waste lithium battery to prepare battery grade lithium carbonate. Lithium is extracted from the waste lithium battery as a raw material to prepare the battery grade lithium carbonate. The method mainly comprises the following steps of (1) battery dismantling; (2) acidifying and leaching; (3) iron and aluminum removal; (4) fluorinating lithium deposition; (5) magnesium salt transformation; (6) alkalifying impurity removal; and (7) lithium deposition employing sodium carbonate. The lithium is recovered from the waste lithium battery to prepare the battery grade lithium carbonate, so that the battery grade lithium carbonate has the advantages of being high in lithium recovery rate, small in losses of other metal elements, friendly to environment and high in product purity; the main content of a product exceeds 99.5%; the requirements of battery grade products are met; and the method is simple in process, low in production cost and suitable for industrial production.

Description

technical field [0001] The invention relates to a method for recycling lithium waste batteries, in particular to a method for recovering lithium from lithium waste batteries to prepare battery-grade lithium carbonate. Background technique [0002] Due to the advantages of high specific energy, long service life, high rated voltage, high power endurance, low self-discharge rate, light weight, and high and low temperature adaptability, lithium-ion batteries have become a popular choice for digital, communication, aviation, and portable electronic products. preferred power source. With its popularization and application in power vehicles and high-power energy storage facilities, its demand will grow explosively. In 2015, the global lithium-ion battery production reached 100.75GWh, of which small batteries accounted for 66.28%, power batteries accounted for 28.26%, and energy storage batteries accounted for 5.46%. In 2015, my country's lithium-ion battery output reached 47.13G...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M6/52H01M10/54C01D15/08
CPCC01D15/08C01P2006/80H01M6/52H01M10/54Y02W30/84
Inventor 李良彬白有仙章小明谢绍忠高贵彦刘超彭爱平李芳芳刘明
Owner GANFENG LITHIUM CO LTD
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