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Leaching method of mixed positive and negative electrodes of nickel-metal hydride batteries

A technology for nickel-metal hydride waste batteries and mixed materials, which is applied in the direction of improving process efficiency, can solve the problems of uneconomical self-use of industrial pure oxygen, complicated leaching equipment, and small amount of industrial pure oxygen, etc., and achieve obvious economic and environmental benefits. , the effect of reducing pollution control costs and improving metal leaching rate

Inactive Publication Date: 2016-01-20
SICHUAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The equipment of the hydrochloric acid leaching method is highly corroded, and the amount of acid mist generated is large and pollutes the environment
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

[0021] Example 1: Add 100g of the positive and negative mixed materials of nickel-metal hydride waste batteries (containing 55.3% nickel, 6.2% cobalt, and 12.5% ​​rare earth) and 37g of straw powder ≤ 1.5mm into a titanium-lined pressure reaction with a volume of 2L. Add 870ml of mixed acid solution with a concentration of sulfuric acid of 1.5mol / L and a concentration of nitric acid of 5g / L into the kettle, leaching at 50°C to 60°C with closed stirring (stirring speed 80r / min) for 4 hours, and liquid-solid separation after leaching. Obtain 840ml leaching solution (excluding leaching slag washing water). The leaching rates of nickel, cobalt and rare earths are 98.9%, 98.5% and 8.8% respectively (calculated based on nickel, cobalt and rare earths entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0022] Example 2: 500g of mixed positive and negative electrode materials of waste nickel-metal hydride batteries (containing 55.3% nickel, 6.2% cobalt, and 12.5% ​​rare earth) and 230g ≤ 1.5mm rice straw powder were added to a titanium-lined pressure reaction with a volume of 5L. Add 2700ml of mixed acid solution with a concentration of sulfuric acid of 3.0mol / L and a concentration of nitric acid of 10g / L in the kettle, and leaching at 70°C to 80°C (stirring speed 70r / min) for 2.0h, and liquid-solid separation after leaching , to obtain 2400ml leaching solution (excluding leaching slag washing water). The leaching rates of nickel, cobalt and rare earths are 99.2%, 99.1% and 7.9% respectively (calculated based on 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 method for leaching the positive and negative mixed materials of nickel-hydrogen waste batteries introduced in the present invention is to add the mixed positive and negative materials separated from waste nickel-hydrogen batteries and obtained through roasting pretreatment and rice straw powder Add the mixed solution of sulfuric acid and nitric acid to the corroded reaction kettle, and carry out stirring and leaching under airtight conditions.

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 positive and negative mixed materials of nickel-metal hydride batteries mainly contain nickel, cobalt and rare earth, and the total content of the three is as high as 75-97%, 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 d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B23/00C22B59/00
CPCY02P10/20
Inventor 龙炳清陈俊万旭
Owner SICHUAN NORMAL UNIV