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Leaching method of anode material of used nickel cadmium battery

A technology for positive electrode materials and waste batteries, applied in the field of leaching of nickel-cadmium waste battery positive electrode materials, can solve the problems of polluted environment, large nitrogen oxides, 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: 2010-03-10
SICHUAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
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  • 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

[0033] Embodiment 1: 100g nickel-cadmium spent battery cathode material (containing nickel 80.6%, cobalt 4.2%) is added in the titanium lining autoclave that volume is 1L, adds the sulfuric acid 650ml of 3.0mol / L, adds nitric acid 7.5g (as HNO 3 ) into 0.2MPa commercially pure oxygen, stirring at 50-60°C (stirring speed 80r / min) for 3 hours, and liquid-solid separation after leaching to obtain 630ml leaching solution (excluding leaching slag washing water) . The reaction tail gas is about 1.1L (converted into a volume with an absolute pressure of 0.1MPa), and the concentration of nitrogen oxides is 2.5mg / m 3 . The leaching rates of nickel and cobalt are 99.0% and 97.6% respectively (calculated based on nickel and cobalt entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0034] Embodiment 2: 500g nickel-cadmium waste battery cathode material (containing nickel 80.6%, cobalt 4.2%) is added in the titanium-lined autoclave that volume is 5L, adds the sulfuric acid 4.5L of 2.5mol / L, adds nitric acid 70g (as HNO 3 0.1MPa of industrial pure oxygen, stirring at 60-70°C (stirring speed 80r / min) for 2.5 hours, liquid-solid separation after leaching, to obtain 4.3L leaching solution (excluding leaching slag washing water ), the reaction tail gas is about 1L (converted into a volume with an absolute pressure of 0.1MPa), and the nitrogen oxide concentration is 3.5mg / m 3 . The leaching rates of nickel and cobalt are 98.9% and 98.1% respectively (calculated based on nickel and cobalt entering the leaching solution and leaching slag washing solution).

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Abstract

The invention provides a leaching method of an anode material of a used nickel cadmium battery, which comprises the following steps: placing the anode material separated from the used nickel cadmium battery into a container resisting 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 used nickel cadmium battery. The leaching temperature is 20-100 DEG C, the leaching pressure is 0.05-0.5 MPa, the leached sulfuric acid initial concentration is 1-5mol / L, the nitric acid initial concentration is 5-20g / L, the leaching time is 1-5h, the stirring is carried out during the leaching, and the stirring speed is 30-100r / min. The addition of the sulfuric acid is 101-200 percent of theoretical consumption of the sulfuric acid leached out of all metal in the anode material added in the reaction container.

Description

technical field [0001] The invention relates to a method for leaching the positive electrode material of nickel-cadmium waste batteries. Background technique [0002] Nickel-cadmium batteries are a type of widely used batteries, and a large amount of waste batteries will be produced after the batteries are 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 anode material of nickel-cadmium battery mainly contains nickel and cobalt, and the total content of the two is as high as 80%, which is very valuable for recycling. At present, the processes for recovering nickel and cobalt from the positive electrode materials of nickel-cadmium batteries mainly include fire process and wet process. The products obtained by the fire process are alloy materials, and it is difficult to obtain relatively pure nickel and cobalt. Wet process is easier t...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/06C22B3/08C22B23/00
CPCY02P10/20
Inventor 龙炳清魏涛龙怡曹攀
Owner SICHUAN NORMAL UNIVERSITY
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