Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF2 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: 100g of waste nickel-cadmium battery positive and negative mixed materials (containing 30.5% nickel, 1.6% cobalt, and 28.1% cadmium) and ≤1.5mm coconut shell powder 19.5g were added to a titanium-lined pressure reactor with a volume of 1L. Add 590ml of a mixed acid solution with a sulfuric acid concentration of 1.5mol / L and a nitric acid concentration of 5g / L, stir at 50°C to 60°C (stirring speed 80r / min) for leaching for 4 hours, and perform liquid-solid separation after leaching to obtain 560ml of leaching solution (excluding leaching slag washing water). The leaching rates of nickel, cobalt and cadmium are 99.3%, 99.0% and 99.4% respectively (calculated based on nickel, cobalt and cadmium entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0023] Example 2: 500g of waste nickel-cadmium battery positive and negative mixed materials (containing 30.5% nickel, 1.6% cobalt, 28.1% cadmium) ≤ 1.5mm coconut shell powder 120g was added to a titanium-lined pressure reactor with a volume of 5L, and sulfuric acid was added Concentration of 2.5mol / L, nitric acid concentration of 10g / L mixed acid solution 2200ml, stirred at 70 ℃ ~ 80 ℃ (stirring speed 70r / min) leaching 2h, liquid-solid separation after leaching, to obtain 2000ml leaching solution (excluding leaching slag washing water), the leaching rates of nickel, cobalt and cadmium are 99.6%, 99.4% and 99.3% respectively (calculated based on nickel, cobalt and cadmium entering the leaching solution and leaching slag washing solution).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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 separated from nickel-cadmium waste batteries and cocoanut shell flour 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00
CPCY02P10/20
Inventor 龙炳清曾伟舒曼
Owner SICHUAN NORMAL UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com