Method for recovering valuable metals from comprehensive recovery slag of waste cobalt acid lithium battery

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: 2021-01-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for recovering valuable metals from comprehensive recovery slag of waste cobalt acid lithium battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Mechanically crush and grind the comprehensively recovered slag of waste lithium cobalt oxide batteries 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 according to 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 be heated. After the end, the vacuum pump continues to run until the temperature in the furnace drops to room temperature, the vacuum pump is turned off, and the volatile product lithium chloride is taken out (wherein, it is a prior art to condense and collect the volatile substances in the vacuum heat treatment, so I will not repeat them here). Its mass is 4.96g, after calculation, the reco...

Embodiment 2

[0037] Mechanically crush and grind the comprehensively recovered slag of waste lithium cobalt oxide batteries 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 according to 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 place 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°C, keep it for 2.0h. The vacuum pump continues to run until the temperature in the furnace is down to room temperature, the vacuum pump is turned off, and the volatile product lithium chloride is taken out. Its quality is 10.42g after weighing. After calculation, the recovery rate of the lithium element is 98.1%, and the purity has reached 99.2%. The coba...

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Abstract

The invention is applicable to the technical field of secondary resource recovery, and particularly relates to a method for recovering valuable metals from comprehensive recovery slag of a waste cobalt acid lithium battery. The method specifically comprises the following steps of mechanically crushing and grinding the comprehensive recovery slag of the waste cobalt acid lithium battery to obtain apowder material; adding calcium fluoride powder into the powder material, mixing, ball-milling, briquetting and drying to obtain a dried material; carrying out vacuum heat treatment on the dried material to obtain a volatile product lithium fluoride and residues rich in cobalt and nickel; and extracting the residues rich in cobalt and nickel to obtain a cobalt-nickel compound. The recovery methodis short and simple in technological process, free of strong acid and strong alkali reagents, environment-friendly, capable of directly recovering lithium, cobalt and nickel, economical, efficient and wide in application range.

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 comprehensive recovery slag of waste 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 such as high voltage, large specific capacity, good cycle performance, no memory effect, and long life. The service life of electronic products is generally 3 to 5 years. Therefore, after the service life is reached, a large amount of waste lithium cobalt oxide batteries will be produced. 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 sim...

Claims

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Application Information

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Patent Type & Authority Applications(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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