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

A cathode material and waste battery technology, which is applied in the field of leaching of cathode materials of nickel-cadmium waste batteries, can solve the problems of industrial pure oxygen storage, transportation and use, uneconomical self-use of industrial pure oxygen, and small amount of industrial pure oxygen, etc. Achieve obvious economic and environmental benefits, reduce pollution control costs, and improve the effect of metal leaching rate

Inactive Publication Date: 2016-02-24
SICHUAN NORMAL UNIV
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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

[0020] Example 1: Add 100 g of the positive electrode material of nickel-cadmium waste batteries (containing 55.2% nickel, 3.8% cobalt) and 35.5 g of ≤ 1.5 mm elephant grass powder into a titanium-lined pressure reactor with a volume of 2 L through roasting pretreatment, and add sulfuric acid 800ml of mixed acid solution with a concentration of 1.5mol / L and a nitric acid concentration of 5g / L was stirred at 50°C to 60°C (stirring speed 80r / min) for 4 hours, and liquid-solid separation was carried out after the leaching was completed to obtain 770ml of leaching solution (not containing leaching slag washing water). The leaching rates of nickel and cobalt are 99.2% and 99.0% respectively (calculated based on nickel and cobalt entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0021] Example 2: 500g of waste nickel-cadmium battery cathode material (containing 55.2% nickel, 3.8% cobalt)≤1.5mm elegans powder 220g is added in a titanium-lined pressure reactor with a volume of 5L through roasting pretreatment, and the concentration of sulfuric acid added is 2500ml of mixed acid solution with 3.0mol / L and nitric acid concentration of 10g / L was stirred at 70°C to 80°C (stirring speed 70r / min) for 2 hours, and liquid-solid separation was carried out after leaching to obtain 2300ml of leaching solution (excluding leaching slag washing water). The leaching rates of nickel and cobalt are 99.6% and 99.3% respectively (calculated based on nickel and cobalt entering the leaching solution and leaching slag washing solution).

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Abstract

The method for leaching the positive electrode material of nickel-cadmium waste battery introduced by the present invention is to add the positive electrode material and elephant grass powder which are separated from nickel-cadmium waste battery and obtained through roasting pretreatment into a reaction kettle with pressure resistance, sulfuric acid and nitric acid corrosion resistance , adding a mixed solution of sulfuric acid and nitric acid, and stirring and leaching under airtight conditions.

Description

technical field [0001] The invention relates to a method for leaching the positive electrode material 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 electrode material of nickel-cadmium waste batteries mainly contains nickel and cobalt, and the total content of the two is as high as about 60%, which is very valuable for recycling. At present, the processes for recovering nickel and cobalt from the positive electrode materials of nickel-cadmium 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 cobal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B23/00
CPCY02P10/20
Inventor 龙炳清陈建文邓国海
Owner SICHUAN NORMAL UNIV
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