Infusion method of Ni-MH used battery anode and cathode mixed material

A nickel-metal hydride waste battery and mixed material technology, applied in the direction of improving process efficiency, can solve the problems of large consumption of nitric acid, polluting the environment, large nitrogen oxides, etc., achieve obvious economic and environmental benefits, and save pollution control Cost, the effect of avoiding the production of pollutant nitrogen oxides

Inactive Publication Date: 2010-01-20
SICHUAN NORMAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

The consumption of nitric acid in the nitric acid leaching method is large, an

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: Add 100 g of waste nickel-hydrogen battery positive and negative mixed materials (containing 57.5% nickel, 6.1% cobalt, and 13.2% rare earth) into a titanium-lined autoclave with a volume of 1 L, add 600 ml of 3.0 mol / L sulfuric acid, and add Nitric acid 9g (as HNO 3 0.2MPa industrial pure oxygen, stirring at 50-60°C (stirring speed 80r / min) for 2 hours, liquid-solid separation after leaching, to obtain 580ml leaching solution (excluding leaching slag washing water ). The reaction tail gas is about 1.2L (converted into a volume with an absolute pressure of 0.1MPa), and the concentration of nitrogen oxides is 2.6mg / m 3 . The leaching rates of nickel, cobalt and rare earth are 98.6%, 97.2% and 6.4% respectively (calculated according to nickel, cobalt and rare earth entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0051] Example 2: 500g of waste nickel-hydrogen battery positive and negative mixed materials (containing 57.5% nickel, 6.1% cobalt, and 13.2% rare earth) were added into a titanium-lined autoclave with a volume of 5L, and 4.5L of 2.0mol / L sulfuric acid was added, 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 leaching, to obtain 4.8L leaching solution (not including leaching slag washing water), the reaction tail gas is about 1L (converted into a volume with an absolute pressure of 0.1MPa), and the concentration of nitrogen oxides is 3.3mg / m 3 . The leaching rates of nickel, cobalt and rare earths are 98.8%, 98.1% and 8.5% respectively (calculated according to nickel, cobalt and rare earths entering the leaching solution and leaching slag washing solution).

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PUM

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Abstract

The invention introduces an infusion method of a Ni-MH used battery anode and cathode mixed material, which is implemented by putting the anode and cathode mixed material separated from Ni-MH used battery in a pressure-resistance, sulfuric acid and nitric acid resistance container, sealing the container and pumping sulfuric acid and nitric acid into the container, and injecting industrial pure oxygen to carry out infusion on the Ni-MH used battery anode and cathode mixed material. The infusion temperature is 20-100 DEG C, the infusion pressure is 0.05-0.5MPa, the sulfuric acid initial concentration of infusion is 1-5mol/L, the nitric acid initial concentration of infusion is 5-20g/L, the infusion time is 1-5h, and the speed of stirring in the process of infusion is 30-100r/min. The addition of sulfuric acid is 101-200% of nitric acid theoretic consumption infused by all metal in the anode and cathode mixed material added into the container.

Description

technical field [0001] The invention relates to a method for leaching the positive and negative mixed materials of waste nickel-hydrogen batteries. Background technique [0002] Ni-MH batteries are a type of batteries widely used, 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-hydrogen positive and negative electrodes mainly contains nickel, cobalt and rare earth, and the total content of the three is as high as 85-97%, which is very valuable for recycling. At present, the processes for recovering nickel, cobalt and rare earth from the positive and negative mixed materials of nickel-metal hydride batteries mainly include pyrotechnics and wet processes. The products obtained by the fire process are alloy materials, and it is diffi...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/06C22B3/08C22B23/00C22B59/00
CPCY02P10/20
Inventor 龙炳清魏涛龙怡方绪坤
Owner SICHUAN NORMAL UNIVERSITY
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