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Method for leaching positive pole material of waste nickel-metal hydride battery

A technology for waste nickel-metal hydride batteries and positive electrode materials, applied in the direction of improving process efficiency, etc., can solve the problems of uneconomical use of industrial pure oxygen, small amount of industrial pure oxygen, and large amount of acid mist, etc., and achieve obvious economic benefits and Environmental benefits, increase metal leaching rate, and reduce the effect of leaching costs

Inactive Publication Date: 2014-04-30
SICHUAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrochloric acid leaching method, equipment corrosion, large amount of acid mist and environmental pollution
Sulfuric acid leaching consumes more expensive reducing agents (such as hydrogen peroxide, etc.), and the leaching speed is slow and the acid consumption is high
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
All wet processes have the problem of how to economically increase the leaching speed, increase the metal leaching rate, and reduce the consumption of acid and other auxiliary materials.
Although the pure oxygen leaching method in the nitric acid processing industry and the pure oxygen leaching method in the mixed acid processing industry have solved the above problems, the leaching equipment is more complicated, and the amount of industrial pure oxygen required for the leaching of waste batteries is not large, and waste battery treatment enterprises produce on-site Industrial pure oxygen is not economical for personal use, and the storage, transportation and use of industrial pure oxygen are troublesome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: 100g waste nickel-hydrogen battery cathode material (containing nickel 56.4%, cobalt 5.9%) and 215mL alcohol production waste water (containing COD Cr 50000mg / L) mixed with sulfuric acid and nitric acid, 850ml of mixed acid solution with a sulfuric acid concentration of 1.5mol / L and a nitric acid concentration of 5g / L was added to a titanium-lined pressure reactor with a volume of 2L, and the mixture was stirred at 50°C to 60°C ( Stirring speed 80r / min) leaching for 4.0h, liquid-solid separation after leaching to obtain 820ml leaching solution (excluding leaching slag washing water). The leaching rates of nickel and cobalt are 99.0% and 98.7% respectively (calculated based on nickel and cobalt entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0018] Embodiment 2: 500g nickel-hydrogen waste battery positive electrode material (containing nickel 56.4%, cobalt 5.9%) and 750mL starch production concentrated waste water (containing COD Cr 90000mg / L) with sulfuric acid and nitric acid, add 2500ml of mixed acid solution with a sulfuric acid concentration of 3.0mol / L and a nitric acid concentration of 10g / L into a titanium-lined pressure reactor with a volume of 5L, and stir at 70°C to 80°C ( Stirring speed 70r / min) leaching for 2.0h, liquid-solid separation after leaching to obtain 2300ml leaching solution (excluding leaching slag washing water). The leaching rates of nickel and cobalt are 99.7% and 99.5% respectively (calculated based on the nickel and cobalt entering the leaching solution and leaching slag washing solution).

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PUM

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Abstract

The invention discloses a method for leaching a positive pole material of a waste nickel-metal hydride battery. The method comprises the steps of adding the positive pole material which is separated from the waste nickel-metal hydride battery and is subjected to roasting pretreatment, and high-concentration organic wastewater which does not contain benzene-ring substances into a reaction kettle which is resistant to pressure and the corrosion of sulfuric acid and nitric acid, adding a mixed solution of sulfuric acid and nitric acid, and leaching while stirring under closed conditions.

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 positive electrode material of nickel-metal hydride batteries 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. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00
CPCY02P10/20
Inventor 龙炳清曾凡芸刁剑
Owner SICHUAN NORMAL UNIVERSITY
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