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Leaching method for anode material of waste LiCoO battery

A cathode material and waste battery technology, which is applied in the field of leaching cathode materials of lithium cobalt oxide waste batteries, can solve the problems of large nitrogen oxides, pollute the environment, large consumption of nitric acid, etc., and achieve the reduction of consumption of nitric acid, obvious economic benefits and Environmental benefits, the effect of saving pollution control costs

Inactive Publication Date: 2009-11-25
SICHUAN NORMAL UNIVERSITY
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  • 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

[0022] Example 1: 100g of lithium cobalt oxide waste battery positive electrode material (containing 53.6% of cobalt, 5.3% of lithium, 8.2% of copper, and 3.4% of aluminum) is added in a stainless steel autoclave with a volume of 2L, and 1800ml of nitric acid of 3.0mol / L is added, Introduce 0.2MPa industrial pure oxygen, stir at 40-50°C (stirring speed 80r / min) for leaching for 2.5 hours, perform liquid-solid separation after leaching, and obtain 1750ml leaching solution (excluding leaching slag washing water). The reaction tail gas is about 600ml (converted into a volume with an absolute pressure of 0.1MPa), and the concentration of nitrogen oxides is 7.3mg / m 3 . The leaching rates of cobalt, lithium and copper are respectively 98.3%, 98.5% and 97.9% (calculated according to the cobalt, lithium and copper entering the leaching solution and leaching slag washing liquid).

Embodiment 2

[0023] Embodiment 2: 400g nickel metal hydride waste battery cathode material (containing cobalt 53.6%, lithium 5.3%, copper 8.2%, aluminum 3.4%) is added in the stainless steel autoclave that volume is 10L, adds the nitric acid 8.5L of 2.5mol / L, Introduce industrial pure oxygen of 0.1MPa, stir at 50-60°C (stirring speed 80r / min) for 3 hours, carry out liquid-solid separation after leaching, obtain 8.4L leaching solution (excluding leaching slag washing water), and react The exhaust gas is about 3.2L (converted into a volume with an absolute pressure of 0.1MPa), and the concentration of nitrogen oxides is 6.7mg / m 3 . The leaching rates of cobalt, lithium and copper are respectively 98.1%, 98.2% and 97.6% (calculated according to the cobalt, lithium and copper entering the leaching solution and leaching slag washing liquid).

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PUM

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Abstract

A leaching method for the anode material of a waste LiCoO battery provided by the invention comprises the following steps: putting the anode material separated from the waste LiCoO battery into a pressure-resistant and nitric acid resistant container, and then sealing the container and pumping nitric acid into the container; leaching the anode material of the waste LiCoO battery by adding industrial pure oxygen. The leaching temperature is 20-100 DEG C; the leaching pressure is 0.05-0.5MPa; the initial concentration of the leached nitric acid is 1-6mol / L; the leaching time is 1-4h; the leaching process needs stirring; and the stirring speed is 30-100r / min. The adding amount of nitric acid is 101-130% of the theoretical quantity of the nitric acid consuming by leaching all the metal out from the anode material added in a reaction vessel.

Description

technical field [0001] The invention relates to a method for leaching lithium cobalt oxide waste battery cathode materials. Background technique [0002] Lithium cobalt oxide battery is a type of battery widely used, and a large amount of waste batteries will be generated after the battery is scrapped. Because this type of battery contains a large amount of heavy metals, if it is discarded into the environment, it will cause great direct and potential harm to the environment. The positive electrode material of lithium cobalt oxide battery mainly contains cobalt, lithium, copper and aluminum, and the total content of cobalt, lithium and copper is greater than 60%, which is very valuable for recycling. At present, the processes for recovering nickel and cobalt from the positive electrode materials of lithium cobalt oxide waste batteries mainly include fire process and wet process. The products obtained by the fire process are alloy materials, and it is difficult to obtain re...

Claims

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Application Information

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