Pyrolysis based resource reclaiming process of waste circuit board

A waste circuit board, recycling technology, applied in the direction of electronic waste recycling, recycling technology, solid waste removal, etc., to achieve the effect of greatly increased feasibility, good recycling value, and high resource recovery rate

Inactive Publication Date: 2010-07-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Today, the contradiction between the supply and demand of natural resources is increasing, and t

Method used

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  • Pyrolysis based resource reclaiming process of waste circuit board
  • Pyrolysis based resource reclaiming process of waste circuit board
  • Pyrolysis based resource reclaiming process of waste circuit board

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiments of the invention employ the following steps:

[0027] (1) Put the waste circuit board with electrical components removed in a pyrolysis furnace, heat it to 450°C, keep it warm for 50 minutes, and carry out pyrolysis, and collect the pyrolysis oil, pyrolysis gas and pyrolysis residue generated during the pyrolysis process , the purified pyrolysis gas generated during the pyrolysis process is introduced into the pyrolysis system as fuel gas to provide energy for the pyrolysis process;

[0028] (2) Since the waste circuit board pyrolysis oil contains a large amount of phenolic compounds, mainly phenol and isopropyl phenol, the pyrolysis oil and formaldehyde collected in step (1) are catalyzed by ammonia by using a water bath method. , react at 95°C for 3-4h, polymerize and synthesize pyrolysis oil-phenolic resin;

[0029] (3) Prepare the pyrolysis oil phenolic resin synthesized in step (2) into carbon functional materials with different shapes and functions: c...

Embodiment 2

[0033] (1) Place the waste circuit boards from which electrical components have been removed in a pyrolysis furnace, heat to 600° C., and keep the temperature for 30 minutes for pyrolysis. All the other steps are the same as in Example 1.

Embodiment 3

[0035] (1) Place the waste circuit board with the electrical components removed in a pyrolysis furnace, heat it to 780° C., keep it warm for 25 minutes, and perform pyrolysis. All the other steps are the same as in Example 1.

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Abstract

The invention discloses a pyrolysis based resource reclaiming process of a waste circuit board, belonging to the technical field of waste resource reclamation and recycle. The method comprises the following steps: placing a waste circuit board with an electric element detached in a pyrolyzing furnace for thermal cracking; collecting pyrolyzed oil, pyrolyzed gas and pyrolyzed residues generated in the pyrolyzing process; directly introducing the purified pyrolyzed gas serving as gas into a pyrolysis system to provide energy for the pyrolyzing process; polymerizing the pyrolyzed oil and formaldehyde to synthesize pyrolyzed oil-phenolic aldehyde resin; selectively synthesizing carbon functional materials with different shapes and structures by using the prepared pyrolyzed oil-phenolic aldehyde resin as precursor; peeling glass fiber in the collected pyrolyzed waste circuit board residues from a metal layer, and reclaiming glass fiber cloth and metal; and removing carbon on the surface of the separated glass fiber by adopting a partial oxidization method, and preparing a veneer sheet together by the carbon and the synthesized pyrolyzed oil-phenolic aldehyde resin. The process ensures that material reclamation in the waste circuit board forms a closed circulation system, and has high resource reclamation rate.

Description

technical field [0001] The invention belongs to the technical field of recovery and reuse of waste resources, and relates to a recycling process for recycling waste circuit boards. Background technique [0002] Waste printed circuit boards are an important part of electronic devices. With the rapid increase in the number of waste electronic and electrical equipment in recent years, the harmless treatment and resource reuse of waste circuit boards have become key issues that need to be solved urgently in the development of the global economy. Waste printed circuit boards usually contain 30% plastics, 30% oxides and about 40% metals, and also contain toxic and harmful substances such as heavy metals and brominated flame retardants. Improper disposal will cause serious environmental pollution and waste of resources . Existing recycling methods such as pyrometallurgy, hydrometallurgy, and mechanical physical methods focus more on the recovery of metals in circuit boards, and se...

Claims

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Application Information

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IPC IPC(8): B09B5/00B09B3/00
CPCY02W30/82
Inventor 李爱民全翠
Owner DALIAN UNIV OF TECH
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