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Method for leaching mixed cathode and anode materials from waste nickel-cadmium batteries

A technology of mixed materials and positive and negative electrodes, which is applied in the field of leaching mixed positive and negative electrodes of nickel-cadmium waste batteries, can solve the problems of large nitrogen oxides, environmental pollution, and large consumption of nitric acid, and achieve obvious economic and environmental benefits , save the cost of pollution control, and avoid the effect of pollutant nitrogen oxides

Inactive Publication Date: 2010-01-13
SICHUAN NORMAL UNIVERSITY
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  • Summary
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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

[0042] Embodiment 1: 100g nickel-cadmium waste battery positive and negative electrode mixed material (containing nickel 43.5%, cobalt 2.3%, cadmium 40.2%) is added in the titanium lining autoclave that volume is 1L, adds the sulfuric acid 550ml of 3.0mol / L, adds Nitric acid 8g (as HNO 30.2 MPa of industrial pure oxygen, stirring at 50-60°C (stirring speed 80r / min) for 2 hours, liquid-solid separation after leaching, to obtain 520ml of leaching solution (excluding leaching slag washing water ). The reaction tail gas is about 1.4L (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 nickel, cobalt and cadmium are respectively 98.8%, 96.7% and 99.1% (calculated according to nickel, cobalt and cadmium entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0043] Embodiment 2: 500g nickel-cadmium waste battery positive and negative electrode mixed material (containing nickel 43.5%, cobalt 2.3%, cadmium 40.2%) is added in the titanium-lined autoclave that volume is 5L, adds the sulfuric acid 4.5L of 2.0mol / L, Add 70g of nitric acid (as HNO 3 ) into 0.1MPa industrial pure oxygen, stirring at 60-70°C (stirring speed: 80r / min) for 3 hours, and liquid-solid separation after the reaction, to obtain 4.2L leaching solution (not including leaching slag washing water), the reaction tail gas is about 1L (converted into a volume of 0.1MPa absolute pressure), and the concentration of nitrogen oxides is 3.5mg / m 3 . The leaching rates of nickel, cobalt and cadmium are 98.5%, 96.5% and 99.2% respectively (calculated according to nickel, cobalt and cadmium entering the leaching solution and leaching slag washing solution).

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Abstract

A method for leaching mixed cathode and anode materials from waste nickel-cadmium batteries, which is introduced by the invention, comprises the following steps: placing the mixed cathode and anode materials separated from the waste nickel-cadmium batteries into a container which is resistant to pressure and sulfuric acid and nitric acid corrosion, sealing the container, pumping the sulfuric acid and nitric acid into the container and filling industrial pure oxygen to leach the mixed cathode and anode materials from the waste nickel-cadmium batteries. The leaching temperature is 20-100 DEG C; the leaching pressure is 0.05-0.5MPa; the initial concentration of the sulfuric acid for leaching is 1-5mol / L and that of the nitric acid is 5-20g / L; the leaching time is 1-5h; stirring is carried out at a speed of 30-100r / min in the process of leaching. The addition of the sulfuric acid is 101-200% of the theoretical consumption of the sulfuric acid leaching all the metals in the mixed cathode and anode materials added into the reaction container.

Description

technical field [0001] The invention relates to a method for leaching the mixed positive and negative electrodes 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 mixed material of nickel-cadmium positive and negative electrodes mainly contains nickel, cobalt and cadmium, and the total content of the three is as high as more than 80%, which is very valuable for recycling. At present, the processes for recovering nickel, cobalt and cadmium from the positive and negative mixed materials of nickel-cadmium waste batteries mainly include fire process and wet process. The products obtained by the fire process are alloy materials, and it i...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/06C22B3/08C22B23/00C22B17/00
CPCY02P10/20
Inventor 龙炳清魏涛龙怡曾凡芸
Owner SICHUAN NORMAL UNIVERSITY
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