A method for recovering valuable metals from the comprehensive recovery slag of waste lithium cobalt oxide batteries

A technology of old lithium cobalt oxide and valuable metals is applied in the field of secondary resource recovery to achieve the effects of efficient recovery, maximization of economic value and simple recovery process

Active Publication Date: 2022-06-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In summary, there is currently no simple, cost-effective, and green method for recovering valuable metals from the comprehensive recycling residue of spent lithium cobalt oxide batteries.

Method used

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  • A method for recovering valuable metals from the comprehensive recovery slag of waste lithium cobalt oxide batteries

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Mechanically crush and grind the waste lithium cobalt oxide battery comprehensive recovery slag to obtain powder materials;

[0033] The lithium in the powder material and the fluorine in the calcium fluoride powder are ball-milled, pressed and dried at a molar ratio of 1:1.5 to obtain a dry material, which is an experimental sample;

[0034] Take 20g of the experimental sample as the initial raw material and put it into the corundum crucible, and then put the crucible in the heating zone of the vacuum furnace. When the vacuum reaches 50Pa, the vacuum furnace will heat it. When the temperature is 750℃, stop the heating and keep the temperature for 1.5h. After finishing, the vacuum pump continues to run, until the temperature in the furnace is down to room temperature, the vacuum pump is closed, and the volatile product lithium chloride is taken out (wherein, in the vacuum heat treatment, the condensed collection of the volatile material is the prior art, and will not be ...

Embodiment 2

[0037] Mechanically crush and grind the waste lithium cobalt oxide battery comprehensive recovery slag to obtain powder materials;

[0038] The lithium in the powder material and the fluorine in the calcium fluoride powder are ball-milled, pressed and dried at a molar ratio of 1:2.0 to obtain a dry material, which is an experimental sample;

[0039] Take 40g of the experimental sample as the initial raw material and put it into the corundum crucible, and then put the crucible in the heating zone of the vacuum furnace. When the vacuum reaches 100Pa, the vacuum furnace is heated. When the temperature is 850℃, it is kept for 2.0h. The vacuum pump continued to run until the temperature in the furnace dropped to room temperature, the vacuum pump was turned off, and the volatile product lithium chloride was taken out. After weighing, its mass was 10.42 g. After calculation, the recovery rate of lithium element was 98.1%, and the purity reached 99.2%. The cobalt and nickel are enrich...

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Abstract

The present invention is applicable to the technical field of secondary resource recovery, and in particular relates to a method for recovering valuable metals from the comprehensive recovery slag of waste lithium cobaltate batteries, specifically, comprising the following steps: carrying out the comprehensive recovery slag of waste lithium cobaltate batteries Mechanical crushing and grinding to obtain a powder material; adding calcium fluoride powder to the powder material, mixing ball milling, briquetting, and drying to obtain a dry material; vacuum heat treatment of the dry material to obtain a volatile product lithium fluoride and the residue enriched in cobalt and nickel; the residue enriched in cobalt and nickel is extracted to obtain a cobalt-nickel compound. The recovery method of the invention has a short and simple process flow, does not need to use strong acid and strong alkali reagents, is environmentally friendly, can directly recover lithium, cobalt and nickel, is economical and efficient, and has a wide range of applications.

Description

technical field [0001] The invention relates to the technical field of secondary resource recovery, in particular to a method for recovering valuable metals from the comprehensive recovery slag of waste and used lithium cobalt oxide batteries. Background technique [0002] After the lithium cobalt oxide battery was successfully commercialized in the 1990s, it has been widely used in electronic products because of its advantages of high voltage, large specific capacity, good cyclability, no memory effect, and long life. The life cycle of electronic products is generally 3 to 5 years. Therefore, a large number of waste lithium cobalt oxide batteries will be produced after the life cycle is reached. It is estimated that by 2021, China's waste lithium cobalt oxide batteries will exceed 20,000 tons, and the recycling market will reach 5.6 billion yuan. Fire recycling is suitable for large-scale recycling of waste lithium cobalt oxide batteries due to its short process and simple...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/00C22B26/12C22B23/00C22B3/38
CPCC22B7/002C22B7/006C22B1/005C22B26/12C22B23/0453C22B3/38Y02P10/20
Inventor 田阳姚少杰杨斌徐宝强王飞刘大春陈秀敏王松立
Owner KUNMING UNIV OF SCI & TECH
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