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Pyrolysis recovery method for organic components of waste light-emitting diodes

A technology for light-emitting diodes and a recycling method is applied in the field of pyrolysis recovery of waste light-emitting diode organic components, which can solve the problems of not considering the recovery of organic components, and achieve the effect of being beneficial to comprehensive recovery and reducing consumption.

Pending Publication Date: 2022-04-12
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process only recovers metal gallium, and does not consider the recovery of organic components

Method used

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  • Pyrolysis recovery method for organic components of waste light-emitting diodes

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Follow the steps below to recycle:

[0028] Put the waste light-emitting diodes into the pyrolysis furnace, and continuously feed argon; under the condition of argon atmosphere, heat up to 300°C and keep it warm for 60 minutes to obtain volatile matter and pyrolysis slag; condense the volatile matter to obtain pyrolysis oil and pyrolysis gas; after purification and combustion, the pyrolysis gas can be used as an energy source to provide heat for pyrolysis; add 15mol / L ammonia water to the pyrolysis oil, the ratio of alkali to oil is 2:1, stir and react at 20°C for 12 minutes, then stand for separation liquid to obtain water layer and oil layer A; the water layer is heated to collect volatilized ammonia gas, which can be reused; oil layer A is centrifuged, and black oil layer B and crude silicon oil are obtained after liquid separation; black oil layer B is washed with water and dried , extracted 3 times with benzene, and distilled under reduced pressure to obtain crude ...

Embodiment 2

[0030] Follow the steps below to recycle:

[0031] Put the waste light-emitting diodes into the pyrolysis furnace, and continuously pass in argon; under the condition of argon atmosphere, heat up to 350°C and keep it warm for 60 minutes to obtain volatile matter and pyrolysis residue; condense the volatile matter to obtain pyrolysis oil and pyrolysis gas; after purification and combustion, the pyrolysis gas can be used as an energy source to provide heat for pyrolysis; add 15mol / L ammonia water to the pyrolysis oil, the ratio of alkali to oil is 1:2, stir and react at 80°C for 15 minutes, then stand and separate liquid to obtain water layer and oil layer A; the water layer is heated to collect volatilized ammonia gas, which can be reused; oil layer A is centrifuged, and black oil layer B and crude silicon oil are obtained after liquid separation; black oil layer B is washed with water and dried , extracted twice with benzene, and distilled under reduced pressure to obtain crud...

Embodiment 3

[0033] Follow the steps below to recycle:

[0034] Put the waste light-emitting diodes into the pyrolysis furnace, and continuously pass in argon; under the condition of argon atmosphere, heat up to 400°C and keep it warm for 50 minutes to obtain volatile matter and pyrolysis slag; condense the volatile matter to obtain pyrolysis oil and pyrolysis gas; after purification and combustion, the pyrolysis gas can be used as an energy source to provide heat for pyrolysis; add 13mol / L ammonia water to the pyrolysis oil, the ratio of alkali to oil is 3:2, stir and react at 50°C for 18 minutes, then stand for separation liquid to obtain water layer and oil layer A; the water layer is heated to collect volatilized ammonia gas, which can be reused; oil layer A is centrifuged, and black oil layer B and crude silicon oil are obtained after liquid separation; black oil layer B is washed with water and dried , extracted twice with benzene, and distilled under reduced pressure to obtain crude...

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Abstract

The invention discloses a pyrolysis recovery method for organic components of waste light-emitting diodes, and belongs to the technical field of photoelectric device recovery. The method comprises the following steps: firstly, pyrolyzing the waste light-emitting diodes, and collecting volatile components to enrich metals; condensing the volatile components to obtain pyrolysis gas and pyrolysis oil, purifying the pyrolysis gas, and combusting for heat recycling; adding ammonia water into the pyrolytic oil, carrying out heating reaction, standing for liquid separation, heating the separated water layer to recover ammonia gas, and carrying out high-speed centrifugation on the oil layer to separate out a black oil layer and crude silicone oil; washing the black oil layer with water, drying, extracting with an organic solvent, and distilling under reduced pressure to prepare crude phenol; according to the method, pyrolysis is adopted, so that metals in the waste light-emitting diodes are effectively enriched, comprehensive recovery of the metals is facilitated, and the effect of reducing the volume of the waste light-emitting diodes by 20-25% is achieved in the pyrolysis process. The pyrolysis gas is directly recycled after being purified, so that the energy consumption is reduced. The phenol is separated by using ammonia water, so that the use of strong base and strong acid is avoided.

Description

technical field [0001] The invention belongs to the technical field of photoelectric device recycling, and in particular relates to a pyrolysis recycling method for organic components of waste light-emitting diodes. Background technique [0002] Light-emitting diodes (Light Emitting Diode, LED) are known as after incandescent lamps, fluorescent lamps and high-pressure gas discharge lamps due to their outstanding advantages such as energy saving, small size, long service life, impact resistance, high reliability, and fast response. The fourth generation of lighting sources, also known as green light sources. Widely used in lighting lamps, LED displays, OLEDs, traffic lights, automotive lamps, LCD backlights, etc. [0003] As the use of LEDs has grown massively, so has the volume of waste. Light-emitting diodes not only contain a large amount of base metals such as iron, aluminum, and copper, but also rare and precious metals such as gallium, indium, gold, and silver, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C10B53/00C08G77/04
CPCC10B53/00C22B7/00C08G77/04
Inventor 李彬陶然吴玉锋张炜
Owner BEIJING UNIV OF TECH
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