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Leaching method of anode material of lithium cobalt oxide waste battery

A technology for positive electrode materials and waste batteries, which is applied in the field of leaching of lithium cobalt oxide waste battery positive electrode materials, can solve the problems of large consumption of nitric acid, environmental pollution, large nitrogen oxides, etc., and achieve obvious economic and environmental benefits. Pollution control costs, the effect of avoiding the generation of pollutant nitrogen oxides

Inactive Publication Date: 2010-12-29
SICHUAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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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 100 g of lithium cobalt oxide waste battery cathode material (containing 53.6% cobalt, 5.3% lithium, 8.2% copper, and 3.4% aluminum) into a titanium-lined autoclave with a volume of 1 L, and add 900 ml of 3.5 mol / L sulfuric acid , add nitric acid 15g (as HNO 3 ) into 0.2MPa industrial pure oxygen, stirring at 50-60°C (stirring speed 80r / min) for leaching for 2.5 hours, and liquid-solid separation after leaching to obtain 850ml leaching solution (excluding leaching slag washing water) . The reaction tail gas is about 0.3L (converted into a volume with an absolute pressure of 0.1MPa), and the concentration of nitrogen oxides is 2.3mg / m 3 . The leaching rates of cobalt, lithium and copper are respectively 98.1%, 97.8% and 97.5% (calculated according to the cobalt, lithium and copper entering the leaching solution and leaching slag washing liquid).

Embodiment 2

[0024] Example 2: Add 400g of waste nickel metal hydride battery cathode material (containing 53.6% cobalt, 5.3% lithium, 8.2% copper, 3.4% aluminum) into a titanium-lined autoclave with a volume of 5L, and add 4.5L of 3.0mol / L sulfuric acid , add nitric acid 60g (as HNO 3 0.1MPa of industrial pure oxygen was introduced, and the reaction was stirred at 60-70°C for 3 hours. After the reaction, liquid-solid separation was carried out to obtain 4.3L of leaching solution (excluding leaching slag washing water), and the reaction tail gas was about 1L ( Converted into an absolute pressure of 0.1MPa), the concentration of nitrogen oxides is 2.5mg / m 3 . The leaching rates of cobalt, lithium and copper are 98.3%, 98.2% and 97.7% respectively (calculated based on the cobalt, lithium and copper entering the leaching solution and leaching slag washing solution).

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Abstract

The invention introduces a leaching method of an anode material of a lithium cobalt oxide waste battery, which comprises the following steps of: placing the anode material separated from the lithium cobalt oxide waste battery into a container which resists pressure and resists the corrosion of sulfuric acid and nitric acid, then sealing the container, pumping the sulfuric acid and the nitric acid into the container, and introducing industrial pure oxygen to leach the anode material of the lithium cobalt oxide waste battery. The leaching temperature is 20-100 DEG C, the leaching pressure is 0.05-0.5MPa, the initial concentration of the leached sulfuric acid is 1-5mol / L, the initial concentration of the nitric acid is 5-20g / L, the leaching time is 1-5 hours, stirring is carried out in the leaching process, and the stirring speed is 30-100r / min. The addition of the sulfuric acid is 101-200 percent of the theoretical consumption of the sulfuric acid for leaching all metals from the anode material added into a reaction container.

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): C22B7/00C22B3/06C22B3/08C22B23/00C22B15/00C22B26/12
CPCY02P10/20
Inventor 龙炳清魏涛龙怡刁剑
Owner SICHUAN NORMAL UNIVERSITY
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