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Leaching method for positive electrode material of waste nickel-hydrogen battery

A technology for nickel-metal hydride waste batteries and cathode materials, which is applied in the direction of improving process efficiency, can solve the problems of polluting the environment, large nitrogen oxides, and large consumption of nitric acid, and achieves reduction of consumption of nitric acid, obvious economic and environmental benefits. , the effect of saving the cost of pollution control

Inactive Publication Date: 2011-11-30
SICHUAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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

[0033] Embodiment 1: 100g nickel-hydrogen waste battery positive electrode material (containing nickel 56.4%, cobalt 5.9%) is added in the stainless steel autoclave that volume is 1L, adds the nitric acid 800ml of 3.0mol / L, feeds the industrial pure oxygen of 0.2MPa, Stir at 40-50°C (stirring speed 80r / min) for leaching for 2.5 hours. After leaching, liquid-solid separation is carried out to obtain 780ml of 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 5.8mg / m 3 . The leaching rates of nickel and cobalt are 98.7% and 97.8% respectively (calculated based on nickel and cobalt entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0034] Embodiment 2: 500g nickel metal hydride waste battery cathode material (containing nickel 56.4%, cobalt 5.9%) is added in the stainless steel autoclave that volume is 10L, adds the nitric acid 5.8L of 2.0mol / L, feeds the industrial pure oxygen of 0.1MPa , stirring at 50-60°C (stirring speed 80r / min) for 3 hours, liquid-solid separation after the reaction, to obtain 5.6L leaching solution (excluding leaching slag washing water), the reaction tail gas is about 6.8L (converted into absolute Pressure 0.1MPa volume), the concentration of nitrogen oxides is 4.7mg / 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

A leaching method for the anode material of a waste nickel-hydrogen battery provided by the invention comprises the following steps: putting the anode material separated from the waste nickel-hydrogen 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 nickel-hydrogen 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 the positive electrode material of nickel-hydrogen waste 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 anode material of Ni-MH battery mainly contains nickel and cobalt, and the total content of the two is as high as 50-70%, which is very valuable for recycling. At present, the processes for recovering nickel and cobalt from the positive electrode materials of nickel-metal hydride 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 to get pu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/06C22B23/00
CPCY02P10/20
Inventor 龙炳清田犀魏涛龙怡公培宝
Owner SICHUAN NORMAL UNIV