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Method for recovering cobalt and lithium from waste lithium ion batteries

A technology of lithium-ion batteries and positive plates, which is applied in the field of waste metal recycling technology, can solve the problems of environmental secondary pollution, etc., and achieve the effect of low equipment requirements, short process flow, and no secondary pollution

Inactive Publication Date: 2010-09-01
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Using hydrometallurgy technology or a combination of pyrometallurgy and hydrometallurgy to recover metal cobalt and lithium in waste lithium-ion batteries, the reported method is to use sulfuric acid + hydrogen peroxide, hydrochloric acid or nitric acid to dissolve lithium-ion battery cathode active material LiCoO 2 , which inevitably produces acid gas, Cl 2 or NO x Exhaust gas, causing serious secondary pollution to the environment

Method used

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  • Method for recovering cobalt and lithium from waste lithium ion batteries
  • Method for recovering cobalt and lithium from waste lithium ion batteries

Examples

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Effect test

Embodiment 1

[0027] Weigh the waste LiCoO according to the mass ratio of 1:4.5:4.5 2 Powder, sodium bisulfate, potassium bisulfate mixture 2g, mixed thoroughly, placed in a crucible, roasted at 700°C for 2 hours, leached the contents of the crucible with water at 50°C, the leaching time was 10 minutes. At 50°C, add 0.2mol / l sodium oxalate solution to the leaching solution obtained in the previous step, wash the precipitate, and dry it at 120°C for 2 hours to obtain cobalt oxalate CoC 2 o 4 . At 95°C, 0.5mol / l sodium carbonate solution was added to the leaching solution after cobalt precipitation, and the resulting precipitate was washed and dried at 120°C for 2 hours to obtain lithium carbonate Li 2 CO 3 . The recovery rate of cobalt in the whole process is 99.99%, and the recovery rate of Li is 98.5%.

Embodiment 2

[0029] Weigh the waste LiCoO according to the mass ratio of 1:4.5:4.5 2Powder, sodium bisulfate, potassium bisulfate mixture 2g, mix well, place in a crucible, bake at 700°C for 1 hour, leaching the contents of the crucible with water at 50°C for 10 minutes. At 50°C, add 0.2mol / l sodium oxalate solution to the leaching solution obtained in the previous step, wash the precipitate, and dry it at 120°C for 2 hours to obtain cobalt oxalate CoC 2 o 4 . At 95°C, 0.5mol / l sodium carbonate solution was added to the leaching solution after cobalt precipitation, and the resulting precipitate was washed and dried at 120°C for 2 hours to obtain lithium carbonate Li 2 CO 3 . The recovery rate of cobalt in the whole process is 99.99%, and the recovery rate of Li is 98.5%.

Embodiment 3

[0031] Weigh the waste LiCoO according to the mass ratio of 1:4.5:4.5 2 Powder, sodium bisulfate, potassium hydrogen sulfate mixture 2g, mixed thoroughly, placed in a crucible, baked at 700°C for 0.5 hours, leached the contents of the crucible with water at 50°C, the leaching time was 10 minutes. At 50°C, add 0.2mol / l sodium oxalate solution to the leaching solution obtained in the previous step, wash the precipitate, and dry it at 120°C for 2 hours to obtain CoC 2 o 4 . At 95°C, 0.5mol / l sodium carbonate solution was added to the leaching solution after cobalt precipitation, and the resulting precipitate was washed and dried at 120°C for 2 hours to obtain lithium carbonate Li 2 CO 3 . The recovery rate of cobalt in the whole process is 99.99%, and the recovery rate of Li is 98.5%.

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Abstract

The invention relates to a method for recovering cobalt and lithium from waste lithium ion batteries, which aims to prevent metals in waste lithium ion batteries from generating secondary waste gas pollution to the environment and lower the requirement on anticorrosion of equipment in the leaching process. The method comprises the following steps of: firstly, discharging and disassembling waste lithium ion batteries; carrying out alkali leaching and filtering treatment on waste positive plates to obtain LiCoO2 powder; fully mixing the LiCoO2 powder and the salts of alkali metals (sodium and potassium) in the mass ratio of 1:3-9, and then, roasting the mixture for 0.2-3 hours at the temperature of 500 DEG C-750 DEG C; leaching the roasted products with water for 5-30 minutes at the temperature of 40 DEG C-70 DEG C; depositing cobalt and lithium in the leaching solution to obtain cobalt oxalate and lithium carbonate; and adjusting components of the leaching waste solution with sulfuric acid, and carrying out crystallization treatment to obtain sodium bisulfate and potassium bisulfate, wherein the sodium bisulfate and the potassium bisulfate can be recycled in the roasting process.

Description

technical field [0001] The invention relates to a recycling process of scrap metal. Background technique [0002] Lithium-ion battery is a new type of high-energy battery successfully developed in the 20th century. It has a series of advantages such as small size, light weight, high energy density, high working voltage, long cycle life and no memory effect. It has been widely used in cameras, mobile phones, etc. , notebook computers, cameras, portable measuring instruments, etc. In addition, it is also the preferred portable high-energy power source for future electric vehicles. As the output of lithium-ion batteries continues to increase year by year, the number of discarded lithium-ion batteries that need to be scrapped due to the expiration of the cycle life and the electrode scraps and electrode fragments generated in the manufacture of lithium-ion batteries has also increased sharply. Its follow-up reasonable treatment is an important problem to be solved urgently. Th...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C22B26/12
Inventor 王大辉张胜全
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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