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

A technology for nickel-hydrogen 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 achieves obvious economic and environmental benefits. , the effect of reducing pollution control costs and improving metal leaching rate

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

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

[0014] Example 1: Add 100 g of the positive and negative mixed materials of spent nickel-metal hydride batteries (containing 55.3% nickel, 6.2% cobalt, and 12.5% ​​rare earth) through roasting pretreatment into a stainless steel pressure reactor with a volume of 1 L, and add 1.5 mol / L 950ml of sulfuric acid, stirred at 40℃~50℃ (stirring speed 80r / min) into SO 2 After leaching for 2.5 hours, the leaching pressure was 0.05 MPa. After the leaching, liquid-solid separation was carried out to obtain 910ml of leaching solution (excluding leaching slag washing water). The leaching rates of nickel, cobalt and rare earth are 99.0%, 98.0% and 9.7% respectively (calculated based on the nickel, cobalt and rare earth entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0015] Example 2: Add 500 g of mixed positive and negative electrode materials (containing 55.3% nickel, 6.2% cobalt, and 12.5% ​​rare earth) of waste nickel-metal hydride batteries (containing 55.3% nickel, 6.2% cobalt, and 12.5% ​​rare earth) that have been pretreated by roasting into a stainless steel pressure reactor with a volume of 5 L, and add 2.0 mol / L 3800ml of sulfuric acid, stirred at 40 ℃ ~ 50 ℃ (stirring speed 80r / min) into SO 2 After leaching for 2.0 hours, the leaching pressure was 0.07MPa. After the leaching, liquid-solid separation was carried out to obtain 3600ml leaching solution (excluding leaching slag washing water). The leaching rates of nickel, cobalt and rare earths are 99.3%, 98.5% and 8.2% 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 invention discloses a method for leaching a positive-negative pole material mixture of a waste nickel-metal hydride battery. The method comprises the steps of putting the positive-negative pole material mixture which is separated from the waste nickel-metal hydride battery and is subjected to roasting pretreatment into a vessel which is resistant to pressure and the corrosion of sulfuric acid, pumping sulfuric acid into the vessel, then, sealing the vessel, and leaching while introducing SO2.

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 ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C22B59/00
CPCY02P10/20
Inventor 龙炳清林春李贵
Owner SICHUAN NORMAL UNIVERSITY
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