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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, lower pollution control costs, and increase the metal leaching rate

Inactive Publication Date: 2014-04-30
SICHUAN NORMAL UNIV
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  • Summary
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  • 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

[0015] Example 1: Add 100g of lithium cobaltate lithium waste battery cathode material (containing 53.6% cobalt, 5.3% lithium, 8.2% copper, 3.4% aluminum) into a stainless steel reactor with a volume of 2L, add 1200ml of 1.5mol / L sulfuric acid, Add 1300ml of 1.5mol / L sulfuric acid, add Na 2 SO 3 51g (300ml solution), leaching at 40°C-50°C under airtight stirring (stirring speed 80r / min) for 2.5h, after leaching, liquid-solid separation was carried out to obtain 1450ml leaching solution (excluding leaching slag washing water). The leaching rates of cobalt, lithium, copper, and aluminum are 98.5%, 98.6%, 98.0%, and 98.1% respectively (calculated based on cobalt, lithium, copper, and aluminum entering the leaching solution and leaching slag washing solution).

Embodiment 2

[0016] 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) into a stainless steel reactor with a volume of 5L, and add it into a stainless steel reactor with a volume of 5L , add 3200 ml of 3.5mol / L sulfuric acid, add Na 2 SO 3 280g (1600ml solution), leaching at 70℃~80℃ with airtight stirring (stirring speed 70r / min) for 1.0h, after leaching, liquid-solid separation was carried out to obtain 4600ml leaching solution (excluding leaching slag washing water), cobalt, lithium The leaching rates of , copper and aluminum are 99.8%, 99.6%, 99.0% and 99.4% respectively (calculated based on cobalt, lithium, copper and aluminum entering the leaching solution and leaching slag washing solution).

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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: putting a positive electrode material subjected to roasting pretreatment separated from lithium cobaltate waste batteries into a pressure-resistant sulfuric-acid-corrosion-resistant container, pumping sulfuric acid into the container, sealing the container, pumping a Na2SO3 solution into the container by using a filling pump, closing the Na2SO3 solution inlet valve, and leaching.

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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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B7/00C22B23/00C22B26/12C22B15/00C22B21/00
CPCY02P10/20
Inventor 龙炳清邓国海陈建文
Owner SICHUAN NORMAL UNIV
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