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Method for extracting lithium from waste lithium ion battery anode material through pre-reduction and optimal solution

A lithium-ion battery and cathode material technology, which is applied in the field of hydrometallurgy, can solve the problems of increasing the amount of sodium hydroxide solution, affecting the quality of the final product, and high processing costs, and achieves less amount of lye, less production, and lower alkalinity. The effect of liquid consumption

Inactive Publication Date: 2020-08-18
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When sodium hydroxide adjusts the pH to 10-12, the amount of sodium hydroxide solution will be increased, resulting in more waste liquid and high treatment costs; the leaching solution contains high lithium, cobalt, nickel, and manganese, which will affect the quality of the final product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the volume mass ratio of water and nickel-cobalt lithium manganese oxide positive electrode material is 2mL / g, add water to the positive electrode material to adjust slurry to obtain slurry, then add 30wt% to the slurry according to the volume mass ratio of hydrogen peroxide and positive electrode material is 4mL / g Hydrogen peroxide is pre-reduced at 20°C for 4 hours, and then 0.6mol / L of dilute sulfuric acid is added at a rate of 2% of the amount of lithium in the positive electrode material according to the molar addition of dilute acid per minute, at a temperature of 85°C Under the condition of leaching for 3h, control the H in dilute sulfuric acid + The ratio of lithium to nickel-cobalt lithium manganate cathode material is 1.0:1.0. After leaching, the primary leachate and primary nickel-cobalt-manganese slag are obtained by filtration. The leaching rates of lithium, nickel, cobalt, and manganese in the primary leachate are respectively 92.51%. , 4.54%,...

Embodiment 2

[0028] According to the volume mass ratio of water and nickel-cobalt lithium manganese oxide positive electrode material is 2mL / g, the positive electrode material is mixed with water to obtain a slurry, and then according to the volume mass ratio of hydrogen peroxide and positive electrode material is 6mL / g, add 30wt% to the slurry Hydrogen peroxide is pre-reduced at 20°C for 4 hours, and then 0.6mol / L of dilute sulfuric acid is added at a rate of 1.5% of the amount of lithium in the positive electrode material according to the molar addition of dilute acid per minute. Under the condition of leaching for 3h, control the H in dilute sulfuric acid + The ratio of lithium to nickel-cobalt lithium manganate cathode material is 1.0:1.0. After leaching, the primary leachate and primary nickel-cobalt-manganese slag are obtained by filtration. The leaching rates of lithium, nickel, cobalt, and manganese in the primary leachate are 94.83% respectively. , 3.12%, 0.28%, 0.03%, and the pH ...

Embodiment 3

[0030] According to the volume mass ratio of water and nickel-cobalt lithium manganese oxide positive electrode material is 2mL / g, the positive electrode material is mixed with water to obtain a slurry, and then according to the volume mass ratio of hydrogen peroxide and positive electrode material is 6mL / g, add 30wt% to the slurry Hydrogen peroxide, pre-reduction at 20°C for 4h, and then adding 0.6mol / L dilute sulfuric acid at a rate of 1% of the amount of lithium in the positive electrode material as the molar addition of dilute acid per minute, at a temperature of 85°C Under leaching for 4 hours, control the H in dilute sulfuric acid + The ratio of lithium to nickel-cobalt lithium manganate cathode material is 1.3:1.0. After leaching, the primary leachate and primary nickel-cobalt-manganese slag are obtained by filtration. The leaching rates of lithium, nickel, cobalt, and manganese in the primary leachate are respectively 96.32%. , 20.51%, 0.73%, 0.06%, and the pH of the p...

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Abstract

The invention discloses a method for extracting lithium from a waste lithium ion battery anode material through pre-reduction and optimal solution. The method comprises the following steps: (1) mixingthe anode material, adding a reducing agent for pre-reduction, gradually adding dilute acid for leaching, and carrying out solid-liquid separation to obtain a primary leaching solution and a primaryleaching residue, wherein the pH value of the primary leaching solution is 5.5-7.0; and (2) adjusting the pH value of the primary leaching solution to 10-12 by using an alkaline solution, and performing solid-liquid separation to obtain a lithium-rich solution and secondary leaching residues. According to the method for extracting the lithium from the waste lithium ion battery anode material through pre-reduction and optimal solution, by changing the adding mode of the acid and the reducing agent and strictly controlling the concentration and the adding speed of the diluted acid, the lithium in the anode material is leached optimally, the front end recovery of the lithium is realized, the lithium loss in the separation process of valuable metals such as nickel, cobalt and manganese is avoided, and the recovery rate of the lithium is improved.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for pre-reducing and extracting lithium from positive electrode materials of waste lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in many fields such as new energy vehicles and electronic products. The increasing consumption of lithium-ion batteries will generate a large amount of waste lithium-ion batteries. Waste lithium ion batteries contain harmful substances and valuable metals, among which Co occupies 5% to 20%, Ni occupies 5% to 10%, Li occupies 5% to 7%, and organic chemical products occupy about 15%. With the emergence of environmental problems and the increasing shortage of resources, it is necessary to recycle waste lithium-ion batteries. my country's lithium, cobalt, and nickel resources are in short supply, resource demand is tight, and excessive dependence on foreign resources. Therefore, it is of gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/12H01M10/54
CPCC22B7/006C22B7/007C22B26/12H01M10/54Y02W30/84Y02P10/20
Inventor 徐建兵洪侃李忠岐陈东英梁鑫古吉汉赖耀斌陈淑梅张选旭
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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