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Environment-friendly acid leaching-extraction process in waste lithium battery recovery

A waste lithium battery and acid leaching technology, which is applied in the direction of improving process efficiency and removing solid waste, can solve problems such as large waste water, achieve the effects of reducing alkali consumption, reducing waste water discharge, and reducing overall costs

Inactive Publication Date: 2008-10-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of producing a large amount of waste water in the existing waste lithium battery cobalt recovery process, and propose an environmentally friendly and economical lithium battery cobalt recovery acid leaching extraction process

Method used

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  • Environment-friendly acid leaching-extraction process in waste lithium battery recovery
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Examples

Experimental program
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Effect test

Embodiment 1

[0009] Embodiment 1: as attached figure 1 In the process shown, 10 kg of waste mobile phone lithium batteries are physically disassembled and shelled to obtain 5.21 kg of crude lithium cobalt oxide (lithium cobaltate and carbon powder), which are stirred and leached in two stages at 80 ° C. The leaching solution is sulfuric acid / Hydrogen peroxide mixed solution (sulfuric acid volume concentration 20%, hydrogen peroxide volume concentration 20%), volume is 6L, two-stage countercurrent leaching, final pH of leaching solution is 4.1, temperature 80 ℃. The leaching solution uses P507 extractant (25% P507 + 25% TBP + 50% sulfonated kerosene, compared to 1) for secondary extraction of cobalt in the solution, back extraction of cobalt with oxalic acid, washing and drying. The raffinate is reconfigured into a leaching solution with a sulfuric acid volume concentration of 20% and a hydrogen peroxide volume concentration of 20%, and returns to the leaching section for reuse, wherein th...

Embodiment 2

[0010] Embodiment 2: adopt this process, under the stirring condition of 85 ℃, use 70L leaching solution two-stage countercurrent leaching lithium cobalt oxygen crude product (lithium cobaltate and carbon powder), two-stage extraction, leaching solution is sulfuric acid / hydrogen peroxide mixed solution (sulfuric acid volume Concentration 15%, hydrogen peroxide volume concentration is 15%), final pH of leachate is 4.5. Add acid and hydrogen peroxide to the raffinate until the volume concentration of sulfuric acid is 15%, and the volume concentration of hydrogen peroxide is 15%, and return to the leaching section for reuse, wherein the consumed water is replenished with washing water during filtration. The raffinate repeats the above cycle 10 times. 70L leaching solution leached 43kg of lithium cobalt oxygen crude product altogether, obtained 37.1kg cobalt oxalate (CoC 2 o 4 .2H 2 O) product, product cobalt content 30.96%, cobalt recovery rate 97.7%. The composition of the e...

Embodiment 3

[0013] Embodiment 3: Use this process to process 1 ton of waste lithium-ion batteries per day, two-stage countercurrent leaching, two-stage extraction, the leachate is a sulfuric acid / hydrogen peroxide mixed solution (the concentration of sulfuric acid is 18%, the concentration of hydrogen peroxide is 20%), and the volume is 7m 3 , the temperature is 80-85°C, the pH of the final leaching solution is 4-4.5, and the average leaching rate is 89%. The extracted organic phase composition is: 25% P507+25% TBP+50% sulfonated kerosene, TBP is a synergistic extractant, the total extraction rate is 94.57%, the overall recovery rate of cobalt is 99.1%, and the cobalt oxalate product meets the BH-JZ-2328 standard Require. The raffinate was recycled 10 times. After 2 months, the implementation effect is as follows: the wastewater discharge of leachate has changed from 2000m 3 The monthly discharge of raffinate is reduced to 240m 3 The monthly discharge of raffinate reduces the discharge...

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Abstract

The invention discloses an environment protective acid leaching-extraction process for the waste lithium battery recovery, lithium cobaltate and carbon power material can be obtained by splitting waste lithium electrically, a multi-section contra-flow acid leaching can be performed in sulphuric acid / oxydol mixed solution, two to four sections can be in counter current percolation extraction, the pH value of the leach solution is 2 to 6, and extracting process can be promoted by the leach liquor; after sulphuric acid / oxydol and washing water are dropped into the raffinade, back to acid leaching section; the raffinade can be used circularly, after lithium is concentrated to 2 to 10g / L in the raffinade, deposit lithium, then the waste water can be discharged and processed. The multi-section counter current percolation extraction is adopted by the invention, thus the pH value of the raffinade meets the requirement of the P507 extraction exactly, one hand, the consumption of alkali is reduced, on the other hand, the raffinade can be used circularly after extraction, water consumption in the process can be saved, and 5 to 15 times of discharge amount of the waste water can be reduced.

Description

technical field [0001] The invention relates to a recycling method for waste lithium batteries, in particular to an environment-friendly lithium battery recycling method. Background technique [0002] Lithium-ion secondary batteries have many excellent properties and are widely used in portable and mobile devices such as mobile phones and notebook computers. According to statistics, the global production of lithium-ion batteries in 2005 was close to 1.5 billion; it is estimated that the output in 2010 will exceed 2 billion. Environmental pollution is also a waste of resources. The analysis results show that each battery contains an average of ~15% cobalt, ~1.5% lithium, ~18% copper, and ~5% aluminum. How to dispose of these batteries and recover valuable metals has become a hot topic in society. [0003] At present, the existing recovery process of cobalt in waste lithium-ion batteries mainly adopts the method of acid dissolution and extraction, that is, HCl, H 2 SO 4 、H...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/38C22B7/00B09B3/00C22B23/00C22B26/12
CPCY02P10/20
Inventor 唐新村满瑞林
Owner CENT SOUTH UNIV
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