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Leaching method of nickel-cadmium waste battery positive-negative electrode mixed material

A technology of mixed materials and waste batteries, applied in the direction of improving process efficiency, etc., can solve the problems of industrial pure oxygen storage, transportation and use trouble, industrial pure oxygen is uneconomical for self-use, industrial pure oxygen is not large, etc., to achieve obvious economy Benefits and environmental benefits, lower pollution control costs, and the effect of increasing metal leaching rates

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 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] Embodiment 1: 100g nickel-cadmium waste battery positive and negative electrode mixed material (containing nickel 30.5%, cobalt 1.6%, cadmium 28.1%) is added in the stainless steel reaction kettle that volume is 1L, adds the sulfuric acid 600ml of 1.5mol / L, at 40 Stir at ℃~50℃ (stirring speed 80r / min) into SO 2 After leaching for 2.5 hours, the leaching pressure was 0.05MPa. After the leaching was completed, liquid-solid separation was performed to obtain 580ml of leaching solution (excluding leaching slag washing water). The leaching rates of nickel, cobalt and cadmium are 99.0%, 98.7% and 99.3% respectively (calculated based on nickel, cobalt and cadmium entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0015] Embodiment 2: 500g nickel-cadmium waste battery positive and negative electrode mixed material (containing nickel 30.5%, cobalt 1.6%, cadmium 28.1%) is added in the stainless steel reaction kettle that volume is 2L, adds the sulfuric acid 1700ml of 3.0mol / L, at 70 Stir at ℃~80℃ (stirring speed is 70r / min) for 1.0h leaching, leaching pressure is 0.15MPa, after leaching, liquid-solid separation is carried out to obtain 1600ml leaching solution (excluding leaching slag washing water), nickel, cobalt and cadmium The leaching rates are 99.7%, 99.2% and 99.4% (calculated based on nickel, cobalt and cadmium entering the leaching solution and leaching slag washing solution).

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Abstract

The invention provides a leaching method of a nickel-cadmium waste battery positive-negative electrode mixed material, which comprises the following steps: putting a positive-negative electrode mixed material subjected to roasting pretreatment separated from nickel-cadmium waste batteries into a pressure-resistant sulfuric-acid-corrosion-resistant container, pumping sulfuric acid into the container, sealing the container, and introducing SO2 to perform leaching.

Description

technical field [0001] The invention relates to a method for leaching the mixed positive and negative electrodes of nickel-cadmium waste batteries. Background technique [0002] Nickel-cadmium batteries are a type of widely used batteries, 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-cadmium waste batteries mainly contain nickel, cobalt and cadmium. The total content of the three is as high as about 60%, which is very valuable for recycling. Very recycling value. At present, the processes for recovering nickel, cobalt and cadmium from the positive and negative mixed materials of nickel-cadmium waste batteries mainly include fire process and wet process. The products obtained by the fire process are allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B7/00C22B23/00C22B17/00
CPCY02P10/20
Inventor 龙炳清陈俊万旭
Owner SICHUAN NORMAL UNIVERSITY
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