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Leaching method of lithium cobaltate waste battery positive electrode material

A technology for positive electrode materials and waste batteries, which is applied in the leaching field of positive electrode materials for lithium cobalt oxide waste batteries, and can solve problems such as troublesome storage, transportation and use of industrial pure oxygen, uneconomical use of industrial pure oxygen for personal use, and small amount of industrial pure oxygen. , to achieve obvious economic and environmental benefits, reduce pollution treatment costs, and increase the 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

[0019] Example 1: Add 100g of lithium cobalt oxide waste battery positive electrode material (containing 53.6% cobalt, 5.3% lithium, 8.2% copper, 3.4% aluminum) and 30g of wheat straw powder ≤ 1.5mm into a titanium-lined pressure reactor with a volume of 2L, Add 1180ml of a mixed acid solution with a sulfuric acid concentration of 1.5mol / L and a nitric acid concentration of 5g / L, and leaching at 60°C to 70°C (stirring speed: 80r / min) for 4.0h in a closed manner. After leaching, liquid-solid separation is carried out to obtain 1150ml Leaching solution (without leach slag wash water). The leaching rates of cobalt, lithium, copper and aluminum are 98.9%, 99.1%, 98.8% and 99.0% respectively (calculated based on cobalt, lithium, copper and aluminum entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0020] Example 2: Add 190 g of 500 g of lithium cobalt oxide waste battery positive electrode material (containing 53.6% cobalt, 5.3% lithium, 8.2% copper, 3.4% aluminum) ≤ 1.5mm wheat straw powder into a titanium-lined pressure reactor with a volume of 5L, and add 3500ml of mixed acid solution with a sulfuric acid concentration of 3.0mol / L and a nitric acid concentration of 10g / L was leached at 70°C to 80°C with closed stirring (stirring speed 70r / min) for 2 hours, and liquid-solid separation was carried out after leaching to obtain 3300ml leaching solution (excluding leaching residue washing water), the leaching rates of cobalt, lithium, copper and aluminum are 99.2%, 99.2%, 99.0% and 98.6% respectively (according to the cobalt, lithium, copper and aluminum calculation).

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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 ryegrass 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): C22B7/00C22B15/00C22B21/00C22B23/00C22B26/12
CPCY02P10/20
Inventor 龙炳清曾凡芸刁剑
Owner SICHUAN NORMAL UNIVERSITY