Method for leaching valuable metals from waste lithium battery anode material

A technology for waste lithium batteries and cathode materials, which is applied in the field of recycling cathode materials from waste lithium batteries, can solve the problems of high treatment cost, difficult separation, environmental pollution, etc., and achieves the effect of reducing separation and purification operations, low cost, and simple process

Inactive Publication Date: 2019-03-08
GUANGDONG JIANA ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ammonia leaching and ammonium oxalate precipitation are likely to cause ammonia nitrogen pollution, and the cost of later treatment is high, so it is not suitable for contemporary industrial production
The addition of other metal ion reducing agents in the leaching process increases the cost of separation and purification.
The leaching effect of using sulfide as a reducing agent is better, but the S (sulfur) in the slag is not easy to separate out, and it is possible to produce SO 2 (sulfur dioxide) causing environmental pollution
Therefore, although the above methods may have better leaching effect, they have certain defects in cost and environment, so they are not suitable for industrial production.

Method used

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  • Method for leaching valuable metals from waste lithium battery anode material
  • Method for leaching valuable metals from waste lithium battery anode material
  • Method for leaching valuable metals from waste lithium battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Raw material composition (w / %)

[0027]

[0028] Step 1: Dilute the concentrated sulfuric acid to the required concentration, and take 50g of waste material after mixing;

[0029] Step 2: 500ml 2.04mol / L of H 2 SO 4 and 70ml H 2 o 2Add it to step 1, and react for 1.5h at 55±2°C with a stirring rate of 330r / min;

[0030] Step 3: Add 7.0 g of glucose after 1.5 hours of system reaction in Step 2, raise the temperature to 80±2°C, filter and wash with hot water after 1.5 hours of reaction;

[0031] Step 4: Dry and weigh 7.2g of the obtained leaching slag filtered in step 3, and measure the Ni, Co, Mn and Li content in the leaching slag to obtain the leaching rate, as shown in the following table:

[0032] Leaching rate (%)

[0033]

Embodiment 2

[0035] Raw material composition (w / %)

[0036]

[0037] Step 1: Dilute the concentrated sulfuric acid to the required concentration, and take 50g of waste material after mixing;

[0038] Step 2: 500ml 2.51mol / L of H 2 SO 4 and 60ml H 2 o 2 Add it to step 1, and react for 1.5h at 55±2°C with a stirring rate of 330r / min;

[0039] Step 3: Add 10.0 g of glucose after 1.5 hours of system reaction in Step 2, raise the temperature to 80±2°C, filter and wash with hot water after 1.5 hours of reaction;

[0040] Step 4: Dry and weigh 8.6g of the obtained leaching slag filtered in step 3, and determine the content of Ni, Co, Mn and Li in the leaching slag to obtain the leaching rate, as shown in the following table:

[0041] Leaching rate (%)

[0042]

Embodiment 3

[0044] Raw material composition (w / %)

[0045]

[0046] Step 1: Dilute the concentrated sulfuric acid to the required concentration, and take 50g of waste material after mixing;

[0047] Step 2: 500ml 3.24mol / L of H 2 SO 4 and 40ml H 2 o 2 Add it to step 1, and react for 1.5h at 55±2°C with a stirring rate of 330r / min;

[0048] Step 3: Add 20.0 g of glucose after 1.5 hours of system reaction in Step 2, raise the temperature to 80±2°C, filter and wash with hot water after 1.5 hours of reaction;

[0049] Step 4: Dry and weigh 5.8g of the obtained leaching slag filtered in step 3, and measure the Ni, Co, Mn and Li content in the leaching slag to obtain the leaching rate, as shown in the following table:

[0050] Leaching rate (%)

[0051]

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Abstract

The invention discloses a method for leaching valuable metals from a waste lithium battery anode material. The method comprises the following steps that firstly, a waste lithium ion battery anode material is dried, then the material is put into a crusher to be crushed and uniformly mixed, and the mixture is sieved by a 200-mesh sieve; then prepared inorganic acid and a reducing agent 1 is poured into the obtained material at a low temperature; then a reducing agent 2 is added into a system after reaction is conducted for a period of time in the step above to react for a period of time; and obtained leached residues from the step above are subjected to filtering and washing, and the valuable metals in the leached residues are tested. According to the method for leaching the valuable metalsfrom the waste lithium battery anode material, the inorganic acid is adopted as a leaching agent, a metal-free ionic compound is used as the reducing agent, waste is leached at the low temperature, then the reducing agent 2 is added at the high temperature, the method has the advantages of being simple in process and low in cost, other metal ions are not introduced into leachate, so that separation and purification operation of the leachate in the subsequent working process is reduced, and the method is suitable for industrial application production.

Description

technical field [0001] The invention relates to a method for recovering positive electrode materials of waste lithium batteries, in particular to a method for leaching valuable metals from positive electrode materials of waste lithium batteries. Background technique [0002] Lithium-ion batteries are widely used in various portable power tools, notebook computers, mobile phones and military due to their advantages of high energy density, good safety and cycle performance, and high charge and discharge efficiency, especially with the development of new energy electric vehicles , The power lithium-ion battery has ushered in unprecedented development. As an important part of lithium-ion batteries, the performance of cathode materials is also one of the most critical factors that determine the performance of lithium-ion batteries, and the performance of precursors for cathode materials in lithium-ion batteries determines the performance of cathode materials for lithium-ion batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/12C22B47/00C22B23/00H01M10/54
CPCC22B7/007C22B23/043C22B26/12C22B47/00H01M10/54Y02P10/20Y02W30/84
Inventor 郭欢梁卫春汤依伟吴理觉
Owner GUANGDONG JIANA ENERGY TECH CO LTD
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