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Based on 5a molecular sieve and fe 3 o 4 Catalytic pyrolysis method of waste circuit boards with composite additives

A composite additive, waste circuit board technology, applied in chemical instruments and methods, electronic waste recycling, solid waste removal, etc. problem, to achieve the effect of good catalytic effect

Active Publication Date: 2020-12-18
GUANGDONG POLYTECHNIC OF ENVIRONMENTAL PROTECTION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional treatment methods of WPCBs mainly include mechanical physical method, chemical method and pyrometallurgy, etc. The purpose is to recover the valuable metals in them. The remaining non-metallic parts are not fully utilized, and it is easy to produce a large amount of waste gas, waste liquid and waste residue, which is harmful to the environment. cause secondary pollution
The pyrolysis technology can effectively separate metals, organic matter and glass fibers, and has attracted much attention and research in recent years, especially the vacuum pyrolysis treatment technology. However, WPCBs contain halogen-containing flame retardants, resulting in thermal Pyrolysis oil contains a large amount of bromine-containing substances, which seriously hinders the further utilization of pyrolysis oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of composite additive, by the molecular sieve 5A of 30 parts by weight and the Fe of 70 parts by weight 3 o 4 composition.

[0022] A based on 5A and Fe 3 o 4 The waste circuit board catalytic pyrolysis method of compound additive comprises the following steps:

[0023] S1. Remove the circuit board of the electronic components and break it, extract the non-metallic powder and non-golden powder and put it into the pyrolysis furnace, and add composite additives, wherein, after the composite additives are mixed evenly, add non-metallic powder and non-golden powder to fully mix;

[0024] S2. After the feeding is completed, heat the pyrolysis furnace to 500°C and keep it for 2 hours until it is completely pyrolyzed, and the pyrolysis oil produced after pyrolysis is collected;

[0025] The weight ratio of non-metallic powder and composite additive is 1:1.

Embodiment 2

[0027] A kind of composite additive, by the molecular sieve 5A of 50 parts by weight and the Fe of 50 parts by weight 3 o 4 composition.

[0028] A based on 5A and Fe 3 o 4 The waste circuit board catalytic pyrolysis method of compound additive comprises the following steps:

[0029] S1. Remove the electronic components and break the circuit board, extract the non-metallic powder and non-golden powder into the pyrolysis furnace, and add compound additives, among which molecular sieve 5A is first added and mixed with the non-metallic powder and non-golden powder evenly before adding Fe 3 o 4 , Fe 3 o 4 Do not mix with non-metallic powder non-golden powder;

[0030] S2. After the feeding is completed, heat the pyrolysis furnace to 550°C and keep it for 1.5 hours until complete pyrolysis, and collect the pyrolysis oil produced after pyrolysis;

[0031] The weight ratio of non-metallic powder to composite additive is 2:1.

Embodiment 3

[0033] A kind of composite additive, by the molecular sieve 5A of 80 parts by weight and the Fe of 20 parts by weight 3 o 4 composition.

[0034] A based on 5A and Fe 3 o 4 The waste circuit board catalytic pyrolysis method of compound additive comprises the following steps:

[0035] S1. Remove the circuit boards of electronic components and break them, extract non-metallic powder and non-golden powder and put them into the pyrolysis furnace, and add composite additives, of which Fe 3 o 4 First add the non-metallic powder and non-golden powder and mix evenly before adding molecular sieve 5A. Molecular sieve 5A is not mixed with non-metallic powder and non-golden powder;

[0036] S2. After the feeding is completed, heat the pyrolysis furnace to 600°C and keep it for 2.5 hours until complete pyrolysis, and collect the pyrolysis oil produced after pyrolysis;

[0037] The weight ratio of non-metal powder to composite additive is 3:1.

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Abstract

The invention discloses a kind of based on 5A and Fe 3 O 4 The method for catalytic pyrolysis of waste circuit boards with composite additives includes the following steps: S1. Crushing the waste circuit boards, extracting non-metallic powders into a pyrolysis furnace, and adding composite additives; S2. Heating the above materials to 500-600° C. , keep for 1.5-2.5 hours until complete pyrolysis, and collect pyrolysis oil; the composite additive is composed of the following components by weight: molecular sieve 5A 25-80 parts, Fe 3 O 4 75 to 20 servings. The invention can simultaneously realize dehalogenation and lightening of the waste circuit board pyrolysis oil, can be widely used in the treatment, disposal or resource utilization of the waste circuit board, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of recycling waste circuit boards, and in particular relates to a 3 o 4 Catalytic pyrolysis method of waste circuit boards with composite additives. Background technique [0002] Printed Circuit Boards (PCB for short) is a thermosetting composite material. As the core component of electronic products, it is widely used in many industrial fields such as electronic components and electric control. With the development of science and technology, the frequency of replacement and elimination of electronic products has accelerated, leading to an increase in the amount of PCB waste. According to the estimate of the United Nations University, in 2005, the e-waste in EU countries was as high as 9.1 million tons, and it was increasing at a rate of 2.5% to 2.7% every year. In 2008, China's output of printed circuit boards was as high as 26% of the world's total, occupying the first place in the world. At the same t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C08J11/16
CPCC08J11/16B09B3/00C08J2300/24B09B3/40Y02W30/62Y02W30/82
Inventor 杨帆孙水裕叶子玮林伟雄陈楠纬李保庆任随周蔡焕然
Owner GUANGDONG POLYTECHNIC OF ENVIRONMENTAL PROTECTION ENG
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