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Leaching method of lithium cobaltate waste battery positive electrode material

A cathode material and waste battery technology, which is applied in the field of leaching cathode materials of lithium cobalt oxide 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. , to achieve obvious economic and environmental benefits, reduce pollution control costs, and improve the effect of 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

[0018] Example 1: Add 100 g of lithium cobalt oxide waste battery cathode material (containing 53.6% cobalt, 5.3% lithium, 8.2% copper, 3.4% aluminum) and 30 g of corn stalk powder ≤ 1.5 mm into a titanium-lined pressure reactor with a volume of 2 L , add 1180ml of a mixed acid solution with a sulfuric acid concentration of 1.5mol / L and a nitric acid concentration of 5g / L, leaching at 60°C to 70°C with closed stirring (stirring speed 80r / min) for 4.0h, and liquid-solid separation after leaching, to obtain 1150ml leaching solution (excluding leaching slag washing water). The leaching rates of cobalt, lithium, copper and aluminum are 99.0%, 99.1%, 98.3% and 98.4% respectively (calculated based on cobalt, lithium, copper and aluminum entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0019] Example 2: Add 500g of lithium cobalt oxide waste battery positive electrode material (containing 53.6% cobalt, 5.3% lithium, 8.2% copper, 3.4% aluminum)≤1.5mm corn stalk powder 190g into a titanium-lined pressure reactor with a volume of 5L, Add 3500ml of a mixed acid solution with a concentration of sulfuric acid of 3.0mol / L and a concentration of nitric acid of 10g / L, and leaching at 70°C to 80°C (stirring speed 70r / min) for 2h in a closed manner. solution (excluding leaching slag washing water), the leaching rates of cobalt, lithium, copper and aluminum are 99.2%, 99.1%, 99.1% and 99.0% respectively (according to the cobalt, lithium, copper in the leaching solution and leaching slag washing solution and aluminum calculations).

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Abstract

The invention provides a leaching method of a lithium cobaltate waste battery positive electrode material, which comprises the following steps: adding a positive electrode material subjected to roasting pretreatment separated from lithium cobaltate waste batteries and corn straw 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 lithium cobalt oxide waste battery cathode materials. Background technique [0002] Lithium cobalt oxide battery is a type of battery widely used, and a large amount of waste batteries will be generated after the battery is 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 lithium cobalt oxide waste batteries mainly contains cobalt, lithium, copper and aluminum, and the total content of cobalt, lithium and copper is more than 60%, which is very valuable for recycling. At present, the processes for recovering cobalt, lithium and copper from the positive electrode materials of lithium cobalt oxide waste batteries mainly include fire process and wet process. The products obtained by the fire process are alloy materials, and it is difficu...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C22B26/12C22B15/00C22B21/00
CPCY02P10/20
Inventor 龙炳清李贵林春
Owner SICHUAN NORMAL UNIVERSITY
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