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Method for recovering valuable metal from high nickel lithium ion battery cathode scrap

A lithium-ion battery and valuable metal technology, applied in the field of waste battery recycling, can solve the problems of low nickel and cobalt recovery efficiency, low cobalt and manganese content, high nickel content, etc., and achieve improved separation effect, efficient recovery, and high-efficiency separation Effect

Inactive Publication Date: 2018-12-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the high-nickel waste leaching solution, the content of cobalt and manganese is low, and the content of nickel is high, so waste LiNi 0.33 co 0.33 mn 0.33 o 2 The recovery efficiency of nickel and cobalt is low and the loss of nickel is serious in the method of metal separation in leach solution of positive electrode material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take 10gLiNi 0.8 co 0.1 mn 0.1 o 2 The positive electrode waste is placed in 100 ml of a solution with a concentration of 4 mol / L, the concentration of hydrogen peroxide in the solution is controlled to be 2 mol / L, and the temperature is 90°C. After 3 hours of leaching, the concentrations of nickel, cobalt, manganese and lithium were 48g / L, 6.04g / L, 5.60g / L and 6.93g / L, respectively, and the leaching rates were all close to 100%.

[0037] Get 10ml leaching liquid, when extracting agent ethylhexyl phosphate mono-2-ethylhexyl is dissolved in sulfonated kerosene, the percentage by volume that extracting agent occupies is 20%, and the volume ratio of control extraction oil phase and water phase is 0.5, extracts The time is 10 minutes, the extraction temperature is 25°C, the extraction equilibrium pH value is 4.5, and the extraction stage is 5 stages. The extraction rate of cobalt and manganese is 99.5%. After the extraction is completed, backwash 3 times with deionized...

Embodiment 2

[0042] The waste material leaching method that present embodiment adopts is identical with embodiment 1, difference is that used waste material is LiNi 0.6 co 0.2 mn 0.2 o 2 , The leaching rate of nickel, cobalt, manganese and lithium is basically the same as the examples, close to 100%.

[0043] The extraction of manganese and cobalt in the leaching solution is exactly the same as in Example 1, and will not be repeated here. Get the raffinate after 10ml extraction, take ethylhexyl phosphate mono-2-ethylhexyl as extractant, sulfonated kerosene as diluent, extractant and sulfonated kerosene are uniformly mixed in a volume ratio of 3:7, control The volume ratio of the extracted oil phase to the water phase is 1, the extraction time is 10 minutes, the extraction temperature is 25°C, the extraction pH value is 6, and the single-pole extraction rate of nickel exceeds 60%. After three stages of countercurrent extraction, the volume ratio of the extraction liquid is 1 :1 deionize...

Embodiment 3

[0046] The waste material leaching method that present embodiment adopts is identical with embodiment 1 and 2, difference is that used waste material is LiNi 0.5 co 0.2 mn 0.3 o 2 , The leaching rate of nickel, cobalt, manganese and lithium is basically the same as the examples, close to 100%.

[0047] The extraction of manganese and cobalt in the leaching solution is exactly the same as that in Examples 1 and 2, and will not be repeated here. Take 10ml of the raffinate after extraction, use Cynex272 as the extractant, sulfonated kerosene as the diluent, and mix the extractant and sulfonated kerosene uniformly at a volume ratio of 3:7, and control the volume ratio of the extracted oil phase to the water phase to 1 , the extraction time is 10 minutes, the extraction temperature is 25°C, the extraction pH value is 8, and the monopolar extraction rate of nickel exceeds 80%. Then back-extract with 1mol / L sulfuric acid solution, the back-extraction time is 15 minutes, and the r...

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Abstract

The invention discloses a method for recovering valuable metal from high nickel lithium ion battery cathode scrap. Firstly, manganese and cobalt are selectively extracted from high nickel leaching solution by the solvent extraction method; then, nickel and lithium in the raffinate are further separated by the solvent extraction method; finally, the selective oxidation precipitation method is applied to the manganese and cobalt separated by extraction to precipitate manganese ions to achieve the separation of cobalt and manganese. Compared with the traditional method of sequentially separatingelements from the leaching solution, by virtue of the co-extraction characteristics and the redox property difference of the cobalt and the manganese, the method not only separates the cobalt and themanganese from nickel and lithium in one step, but also separates the cobalt and the manganese with high efficiency, and only the two elements of nickel and lithium are left in the raffinate, so thatthe system is simple and the separation effect is greatly improved. The medicament used in the method is cheap, the operation process is simple, the adverse effect of the excessive nickel component onseparation and extraction can be overcome, and the whole component recovery of nickel, cobalt, manganese and lithium resources in the high nickel lithium ion battery scrap is realized.

Description

technical field [0001] The invention relates to the field of waste battery recovery, in particular to a method for recovering valuable metals from high-nickel lithium-ion battery positive electrode waste. technical background [0002] At present, ternary lithium-ion battery materials have become mainstream products in the power lithium-ion battery material market, and the demand is increasing. LiNi 0.33 co 0.33 mn 0.33 o 2 As one of the most important ternary lithium-ion battery materials, it occupies a very heavy market share. In response to the ternary lithium-ion battery material LiNi 0.33 co 0.33 mn 0.33 o 2 With the advent of the end-of-life period, people have developed a variety of methods for extracting nickel, cobalt, manganese and lithium from waste materials according to their composition characteristics. For example, after leaching the ternary lithium-ion battery waste with a mixed solution of sulfuric acid and hydrogen peroxide, by adding KMnO to the le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/38C22B7/00C22B23/00C22B26/12C22B47/00H01M10/54
CPCC22B7/007C22B23/043C22B23/0461C22B26/12C22B47/00C22B3/3844C22B3/3846H01M10/54Y02W30/84Y02P10/20
Inventor 杨越孙伟雷舒雅胡岳华宋绍乐
Owner CENT SOUTH UNIV
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