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Method for recycling valuable metals of waste lithium ion batteries

A lithium-ion battery and valuable metal technology, which is applied in the field of recycling valuable metals in waste lithium-ion batteries, can solve the problems of reduced work efficiency, increased labor and material costs, and increased surface tension in the process flow, so as to improve the probability of contact reaction and reduce Input of heat source, effect of improving recovery rate

Inactive Publication Date: 2021-07-27
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In related technologies, it is mentioned to use steps such as battery powder acid leaching, iron powder to remove copper, and iron and aluminum to obtain valuable metal liquid, but the lengthy process will not only reduce work efficiency, but also increase the cost of manpower and material resources
[0004] Battery powder contains a large amount of organic matter coated active materials. In the actual production of recycling valuable metals in waste lithium batteries, a large amount of organic matter coating will reduce the probability of contact between the positive electrode material and sulfuric acid and reduce the reaction rate. A large amount of organic matter will make the solution The surface tension in the medium increases, causing the gas released during the leaching process to generate a large number of bubbles, causing risks such as sinking

Method used

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  • Method for recycling valuable metals of waste lithium ion batteries
  • Method for recycling valuable metals of waste lithium ion batteries
  • Method for recycling valuable metals of waste lithium ion batteries

Examples

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Effect test

Embodiment 1

[0039] This embodiment reclaims the valuable metals in the waste lithium ion battery, and the specific process is:

[0040] Take 100g of battery powder, add 106ml of concentrated sulfuric acid with a mass concentration of 70%, mechanically stir slowly for 0.5h, add 300g of water, heat in a water bath at 70°C, and conduct a water immersion reaction for 2h. After the water immersion reaction, the pH of the solution is 5.0. Filter to obtain the first organic Valence metal liquid and first graphite slag;

[0041] The first graphite slag was weighed to be 42g, and the first graphite slag was slurried with 126ml of water, the temperature was raised to 70°C, concentrated sulfuric acid was added dropwise to pH 0.5, and sodium sulfite, which was 1 times the molar amount of the valuable metal in the graphite slag, was added and reacted for 4 hours. Add an appropriate amount of sodium hydroxide dropwise to adjust the pH of the solution to 4.5, react for 1 hour, and filter to obtain the s...

Embodiment 2

[0043] This embodiment reclaims the valuable metals in the waste lithium ion battery, and the specific process is:

[0044] Take 100g of battery powder, add 99ml of concentrated sulfuric acid with a mass concentration of 75%, mechanically stir slowly for 0.5h, add 300g of water, heat in a water bath at 70°C, and conduct a water immersion reaction for 2h. After the water immersion reaction, the pH of the solution is 5.0. Filter to obtain the first Valence metal liquid and first graphite slag;

[0045] Weigh the first graphite slag to be 45g, make slurry with the first graphite slag and 135ml water, raise the temperature to 70°C, add concentrated sulfuric acid dropwise to pH0.5, add sodium sulfite with 1.2 times the molar amount of the valuable metal in the graphite slag, react for 3h, Add an appropriate amount of sodium hydroxide dropwise to adjust the pH of the solution to 4.5, react for 1 hour, and filter to obtain the second valuable metal liquid and the second graphite slag...

Embodiment 3

[0047] This embodiment reclaims the valuable metals in the waste lithium ion battery, and the specific process is:

[0048] Take 100g of battery powder, add 93ml of concentrated sulfuric acid with a mass concentration of 80%, mechanically stir slowly for 0.5h, add 300g of water, heat in a water bath at 70°C, and immerse in water for 2h. After the water immersion, the pH of the solution is 5.0, and filter to obtain the first organic Valence metal liquid and first graphite slag;

[0049]Weigh the first graphite slag to be 45g, make slurry with the first graphite slag and 135ml water, raise the temperature to 70°C, add concentrated sulfuric acid dropwise to pH 0.5, add sodium sulfite with 1.3 times the molar amount of the valuable metal in the graphite slag, react for 3h, Add an appropriate amount of sodium hydroxide dropwise to adjust the pH of the solution to 4.5, react for 1 hour, and filter to obtain the second valuable metal liquid and the second graphite slag.

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Abstract

The invention discloses a method for recycling valuable metals in waste lithium ion batteries, which comprises the following steps: firstly, adding battery powder into concentrated sulfuric acid for curing leaching, then adding water for water leaching, after solid-liquid separation, adding first graphite slag into dilute sulfuric acid for acid leaching, then adding a reducing agent for reduction leaching, then adding alkali for precipitating impurities, and finally, carrying out solid-liquid separation to obtain second graphite slag and second valuable metal liquid. According to the method of the invention, organic matters in battery powder are carbonized and decomposed by utilizing the carbonization effect of concentrated sulfuric acid, so that the problems of bubbling, overflowing and the like caused by the organic matters in the processes of coating active substances of the battery powder with the organic matters and performing water leaching and acid leaching are solved; and leaching and impurity removal are synchronously carried out, the valuable metal recovery process of the waste lithium batteries is simplified, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of resource recycling of waste lithium ion batteries, and in particular relates to a method for recycling valuable metals of waste lithium ion batteries. Background technique [0002] After a certain number of cycles of charging and discharging of lithium-ion batteries, the structure of the active material will become invalid due to changes. It is estimated that the amount of scrapped and scrapped automotive power batteries will reach 101GWh in 2030, about 1.16 million tons. Scrapped lithium-ion batteries contain a variety of harmful substances, such as heavy metals, organic and inorganic harmful compounds, etc. If they are not disposed of in time, they will easily pollute the environment. At the same time, lithium-ion batteries contain a large amount of nickel-cobalt-manganese-lithium valuable metals. If they are not recovered in time, it will inevitably cause waste of resources and pollution to the environ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C01B32/215H01M10/54
CPCC22B7/006C22B7/007C01B32/215H01M10/54Y02W30/84C22B7/00
Inventor 何然黎亮李长东陈鑫根吕东忍季滨春
Owner GUANGDONG BRUNP RECYCLING TECH
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