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Method for lixiviating anode materials of lithium nickel waste batteries

A lithium nickel oxide waste battery and positive electrode material technology, applied in the direction of improving process efficiency, can solve the problems of large nitrogen oxides, polluting the environment, large consumption of nitric acid, etc., achieve obvious economic and environmental benefits, and save pollution Treatment costs, the effect of avoiding the generation of pollutant nitrogen oxides

Inactive Publication Date: 2010-02-10
SICHUAN NORMAL UNIVERSITY
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The consumption of nitric acid in the nitric acid leaching method is large, and a large amount of nitrogen oxides will be produced, polluting the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Add 100g of lithium nickelate waste battery positive electrode material (containing nickel 54.3%, lithium 5.5%, copper 7.8%, aluminum 3.1%) into a titanium-lined autoclave with a volume of 1L, add 3.5mol / L of Sulfuric acid 880ml, add nitric acid 13g (with HNO 3 meter), introduce 0.2MPa industrial pure oxygen, stir at 50~60℃ (stirring speed 80r / min) and leaching for 2.0 hours, carry out liquid-solid separation after leaching to obtain 840ml leaching solution (without leaching residue washing water) . The reaction tail gas is about 0.36L (converted to the volume of absolute pressure of 0.1MPa), and the concentration of nitrogen oxides is 2.4mg / m 3 . The leaching rates of nickel, lithium and copper were 98.2%, 98.3% and 97.1%, respectively (calculated based on the nickel, lithium and copper entering the leaching solution and the leaching residue washing solution).

Embodiment 2

[0024] Example 2: Add 400g of lithium nickelate waste battery positive electrode material (containing 54.3% nickel, 5.5% lithium, 7.8% copper, and 3.1% aluminum) into a titanium-lined autoclave with a volume of 5L, add 3.0mol / L sulfuric acid 4.1% L, add nitric acid 60g (with HNO 3 0.1MPa industrial pure oxygen was introduced, and the reaction was stirred at 60-70°C for 3 hours. After the reaction, liquid-solid separation was performed to obtain 3.9L of leaching solution (excluding leaching residue washing water), and the reaction tail gas was about 1.8L. (Converted to the volume of absolute pressure of 0.1MPa), the concentration of nitrogen oxides is 2.1mg / m 3 . The leaching rates of nickel, lithium and copper were 98.3%, 98.6% and 97.3%, respectively (calculated based on the nickel, lithium and copper entering the leaching solution and the leaching residue washing solution).

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PUM

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Abstract

The invention relates to a method for lixiviating anode materials of lithium nickel waste batteries. In the invention, the anode materials separated from the lithium nickel waste batteries are put ina container which resists pressure and resists corrosion of sulfuric acid and nitric acid; then the container is sealed; the sulfuric acid and the nitric acid are pumped into the container; and industrial pure oxygen is led in for lixiviating the anode materials of the lithium nickel waste batteries. The lixiviated temperature is 20 to 100 DEG C, the lixiviated pressure is 0.05 to 0.5 MPa, the initial concentration of the lixiviated sulfuric acid is 1 to 5 mol / L, the initial concentration of the nitric acid is 5 to 20 g / L, the lixiviated time is 1 to 5 hours, stirring is carried out on the lixiviated process, and the stirring speed is 30 to 100 r / min. The quality of the added sulfuric acid is 101 to 200 % of the theoretical consumption of the sulfuric acid lixiviated from all of metal of the anode materials added into the container.

Description

technical field [0001] The invention relates to a leaching method for positive electrode materials of lithium nickelate waste batteries. Background technique [0002] Lithium nickelate battery is a kind of widely used battery, which will produce a large amount of waste battery when it is scrapped. Since such batteries contain a large amount of heavy metals, if they are discarded into the environment, they will cause great direct and potential harm to the environment. The positive electrode material of lithium nickelate battery mainly contains nickel, lithium, copper and aluminum, of which the total content of nickel, lithium and copper is more than 60%, which is very valuable for recycling. At present, the process of recovering nickel and nickel from the cathode material of lithium nickelate waste battery mainly includes pyro process and wet process. The products obtained by the pyrotechnic process are alloy materials, and it is difficult to obtain relatively pure nickel, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/06C22B3/08C22B23/00C22B15/00C22B26/12
CPCY02P10/20
Inventor 龙炳清魏涛龙怡张章
Owner SICHUAN NORMAL UNIVERSITY
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