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
View PDF12 Cites 65 Cited by
  • Summary
  • 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 perox

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for recovering cobalt and lithium from waste lithium ion batteries
  • Method for recovering cobalt and lithium from waste lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1:

[0027] Weigh the waste LiCoO according to the mass ratio of 1:4.5:4.5 2 2g of powder, sodium bisulfate, potassium bisulfate mixture, thoroughly mixed, placed in a crucible, baked at 700°C for 2 hours, and leached out the material in the crucible with water at 50°C for 10 minutes. Under the condition of 50℃, add 0.2mol / l sodium oxalate solution to the leachate obtained in the previous step. The precipitate is washed and dried at 120℃ for 2 hours to obtain cobalt oxalate CoC 2 O 4 . At 95℃, add 0.5mol / l sodium carbonate solution to the cobalt-precipitated leaching solution. The resulting precipitate is washed and dried at 120℃ 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%.

Example Embodiment

[0028] Example 2:

[0029] Weigh the waste LiCoO according to the mass ratio of 1:4.5:4.5 2 2g of powder, sodium bisulfate, potassium bisulfate mixture, thoroughly mixed, placed in a crucible, baked at 700°C for 1 hour, and leached the material in the crucible with water at 50°C for 10 minutes. At 50℃, add 0.2mol / l sodium oxalate solution to the leachate obtained in the previous step. The precipitate is washed and dried at 120℃ for 2 hours to obtain cobalt oxalate CoC 2 O 4 . Under the condition of 95℃, 0.5mol / l sodium carbonate solution was added to the leaching solution after cobalt precipitation. The resulting precipitate was washed and dried at 120℃ 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%.

Example Embodiment

[0030] Example 3:

[0031] Weigh the waste LiCoO according to the mass ratio of 1:4.5:4.5 2 2g of powder, sodium bisulfate, potassium bisulfate mixture, thoroughly mixed, placed in a crucible, baked at 700°C for 0.5 hours, and leached out the material in the crucible with water at 50°C for 10 minutes. Under the condition of 50℃, add 0.2mol / l sodium oxalate solution to the leachate obtained in the previous step. The precipitate is washed and dried at 120℃ for 2 hours to obtain CoC 2 O 4 . At 95℃, add 0.5mol / l sodium carbonate solution to the cobalt-precipitated leaching solution. The resulting precipitate is washed and dried at 120℃ 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%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2023 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap