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

A technology of mixed materials and positive and negative electrodes, which is applied in the field of leaching mixed positive and negative electrodes of nickel-cadmium waste batteries, can solve the problems of industrial pure oxygen storage, transportation and use, uneconomical industrial pure oxygen for personal use, and insufficient amount of industrial pure oxygen Major problems, achieving obvious economic and environmental benefits, reducing pollution treatment costs, and improving the metal leaching rate

Inactive Publication Date: 2014-04-30
SICHUAN NORMAL UNIVERSITY
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  • Abstract
  • Description
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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

[0021] Example 1: Add 100g of nickel-cadmium waste battery positive and negative electrode mixed materials (containing 30.5% nickel, 1.6% cobalt, 28.1% cadmium) and 19.5g of grass powder ≤ 1.5mm into a titanium-lined pressure reactor with a volume of 1L, add 590ml of mixed acid solution with sulfuric acid concentration of 1.5mol / L and nitric acid concentration of 5g / L was stirred at 50°C to 60°C (stirring speed 80r / min) and leached for 4 hours. After leaching, liquid-solid separation was performed to obtain 560ml of leaching solution ( Does not contain leaching residue washing water). The leaching rates of nickel, cobalt and cadmium were 99.2%, 98.5% and 99.4%, respectively (calculated based on the nickel, cobalt and cadmium entering the leaching solution and the leaching residue washing solution).

Embodiment 2

[0022] Example 2: Add 500g of nickel-cadmium waste battery positive and negative mixed materials (containing 30.5% nickel, 1.6% cobalt, 28.1% cadmium) ≤ 1.5mm forage powder 120g into a titanium-lined pressure reactor with a volume of 5L, add sulfuric acid concentration 2200ml of mixed acid solution with 2.5mol / L and 10g / L nitric acid concentration, leaching at 70℃~80℃ with stirring (stirring speed is 70r / min) for 2 hours, and liquid-solid separation is carried out after leaching to obtain 2000ml leaching solution ( Excluding leaching residue washing water), the leaching rates of nickel, cobalt and cadmium are 99.5%, 99.3% and 99.3% respectively (calculated based on the nickel, cobalt and cadmium entering the leaching solution and the leaching residue 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: adding a positive-negative electrode mixed material subjected to roasting pretreatment and separated from nickel-cadmium waste batteries and pasture powder into a pressure-resistant sulfuric-acid / nitric-acid-corrosion-resistant reaction kettle, adding a sulfuric acid-nitric acid mixed solution, and carrying out agitation leaching under sealed conditions.

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): C22B7/00C22B23/00C22B17/00
CPCY02P10/20
Inventor 龙炳清万旭陈俊
Owner SICHUAN NORMAL UNIVERSITY
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