Method for leaching positive-negative pole material mixture of waste lithium nickel cobalt manganese oxide battery

A technology of nickel-cobalt lithium manganate and mixed materials is applied in the field of leaching of positive and negative electrode mixed materials of nickel-cobalt lithium manganate waste batteries, which can solve the problems of storage, transportation and use of industrial pure oxygen, uneconomical self-use of industrial pure oxygen, It can achieve obvious economic and environmental benefits, reduce pollution control costs, and improve 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 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

[0025] Example 1: 100g of nickel-cobalt lithium manganese oxide waste battery positive and negative mixed materials (containing 14.5% nickel, 20.3% cobalt, 17.5% lithium, 2.2% aluminum, 2.5% copper, 12.9% manganese) and ≤1.5mm Elephant grass Add 29g of powder into a titanium-lined pressure reactor with a volume of 2L, add 1650ml of a mixed acid solution with a concentration of sulfuric acid of 1.5mol / L and a concentration of nitric acid of 5g / L, and stir in a closed manner at 50°C to 60°C (stirring speed 80r / min) After leaching for 4 hours, liquid-solid separation was performed after leaching to obtain 1600ml of leaching solution (excluding leaching slag washing water). The leaching rates of nickel, cobalt, lithium, copper, aluminum and manganese are 99.2%, 99.1%, 99.3%, 98.9%, 98.7% and 99.1% respectively (according to the nickel, cobalt and lithium in the leaching solution and leaching slag washing solution , copper, aluminum and manganese calculations).

Embodiment 2

[0026] Example 2: 300g of nickel-cobalt lithium manganate waste battery positive and negative mixed materials (containing 14.5% nickel, 20.3% cobalt, 17.5% lithium, 2.2% aluminum, 2.5% copper, 12.9% manganese) and ≤1.5mm elephant grass Add 105g of powder into a titanium-lined pressure reactor with a volume of 5L, add 3000ml of a mixed acid solution with a concentration of sulfuric acid of 3mol / L and a concentration of nitric acid of 10g / L, and stir at 70°C to 80°C (stirring speed 70r / min) for leaching 2h, liquid-solid separation is carried out after leaching, and 2800ml leaching solution is obtained (excluding leaching slag washing water). The leaching rates of nickel, cobalt, lithium, copper, aluminum and manganese are 99.5%, 99.4%, 99.6%, 99.1%, 98.5% and 99.3% respectively (according to the nickel, cobalt and lithium in the leaching solution and leaching slag washing solution , copper, aluminum and manganese calculations).

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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 lithium nickel cobalt manganese oxide battery. The method comprises the steps of adding the positive-negative pole material mixture which is separated from the manganese waste lithium cobalt oxide battery and is subjected to roasting pretreatment, and napier grass powder into a reaction kettle which is resistant to pressure and the corrosion of sulfuric acid and nitric acid, adding a mixed solution of sulfuric acid and nitric acid, and leaching while stirring under closed conditions.

Description

technical field [0001] The invention relates to a method for leaching the positive and negative electrode mixed materials of nickel-cobalt lithium manganate waste batteries. Background technique [0002] Nickel-cobalt lithium manganese oxide battery (battery whose main metal elements are nickel, cobalt, manganese, and lithium in the positive and negative mixed materials) is a new type of battery. After the battery is used and scrapped, a large number of waste batteries will be produced. 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 cobalt lithium manganate battery mainly contain nickel, cobalt, lithium, copper, aluminum and manganese, of which the total content of nickel, cobalt and lithium is as high as 50%, which is very valuable for recycling. At present, the processes for recovering cobalt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00C22B26/12C22B15/00C22B21/00C22B47/00
CPCY02P10/20
Inventor 龙炳清舒曼曾伟
Owner SICHUAN NORMAL UNIVERSITY
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