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Leaching method of lithium iron phosphate waste battery positive electrode material

A technology of lithium iron phosphate and positive electrode materials, which is applied in the field of leaching of lithium iron phosphate waste battery positive electrode materials, which can solve the problems of industrial pure oxygen storage, transportation and use, uneconomical industrial pure oxygen for personal use, and small amount of industrial pure oxygen, etc. problems, achieving obvious economic and environmental benefits, reducing pollution control costs, and low cost

Inactive Publication Date: 2014-04-30
SICHUAN NORMAL UNIVERSITY
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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

[0013] Example 1: Add 100 g of lithium iron phosphate waste battery positive electrode material (containing 4.3% lithium, 5.2% aluminum, and 34.8% iron) into a stainless steel reactor with a volume of 1 L, add 820 ml of 1.5 mol / L sulfuric acid, and heat Stirring at 50°C (stirring speed 80r / min) into SO 2 After leaching for 3.0 hours, the leaching pressure was 0.05MPa. After the leaching was completed, liquid-solid separation was performed to obtain 780ml of leaching solution (excluding leaching slag washing water). The leaching rates of lithium, aluminum and iron are 99.7%, 0.01% and 99.5% respectively (calculated based on lithium, aluminum and iron entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0014] Example 2: Add 300g of lithium iron phosphate waste battery positive electrode material (containing 4.3% lithium, 5.2% aluminum, and 34.8% iron) into a stainless steel reactor with a volume of 2L, add 1500ml of 3.0mol / L sulfuric acid, and heat it at 70°C- Stir at 80°C (stirring speed 70r / min) for 1 hour of leaching, and the leaching pressure is 0.15MPa. After leaching, liquid-solid separation is carried out to obtain 1300ml of leaching solution (excluding leaching slag washing water). The leaching rates of lithium, aluminum and iron are 99.8%, 0.01% and 99.7% respectively (calculated based on lithium, aluminum and iron entering the leaching solution and leaching slag washing solution).

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Abstract

The invention provides a leaching method of a lithium iron phosphate waste battery positive electrode material, which comprises the following steps: putting a positive-negative electrode mixed material subjected to roasting pretreatment separated from lithium iron phosphate waste batteries into a pressure-resistant sulfuric-acid-corrosion-resistant container, pumping sulfuric acid into the container, sealing the container, and introducing SO2 to perform leaching.

Description

technical field [0001] The invention relates to a method for leaching the cathode material of lithium iron phosphate waste batteries. Background technique [0002] Lithium iron phosphate batteries (batteries whose positive electrode materials contain lithium, aluminum and iron as the main metal elements) are a new type of batteries, which will produce a large number of waste batteries after they are used and discarded. If this type of battery is discarded into the environment, it will cause great direct and potential harm to the environment. The positive electrode material of lithium iron phosphate battery mainly contains lithium, aluminum and iron, and the total content of lithium is as high as 4%, which is very valuable for recycling. At present, the process of recovering lithium from the positive electrode material of lithium iron phosphate waste battery is mainly wet process. Leaching is an essential process in the wet process. At present, the leaching methods of lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/12C22B21/00C21B15/00
CPCY02P10/20
Inventor 龙炳清王杰才龚婕
Owner SICHUAN NORMAL UNIVERSITY
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