a kind of al 2 o 3 and fe 3 o 4 Method for composite catalytic pyrolysis of waste circuit board non-metallic powder

Abstract

The invention discloses an Al 2 o 3 and Fe 3 o 4 The method for composite catalytic pyrolysis of waste metal powder of waste circuit boards comprises the following steps: S1. Breaking waste circuit boards, extracting non-metallic powders, putting the non-metallic powders into the first temperature zone of a two-stage heating pyrolysis furnace, and simultaneously Put the composite catalyst into the second temperature zone of the two-stage heating pyrolysis furnace. S2. The first temperature zone and the second temperature zone are heated at the same time. For 2 hours, the heating condition in the second temperature zone is to heat to 500-600°C, keep it for 2-3 hours, and collect the pyrolysis oil after complete pyrolysis; the composite catalyst is composed of the following components by weight: Al 2 o 3 40-60 parts, Fe 3 o 4 60-40 servings. The invention effectively improves the economic added value of the waste circuit board pyrolysis oil by dehalogenating and lightening the waste circuit board pyrolysis oil.

Description

technical field [0001] The invention belongs to the technical field of recycling waste circuit boards, in particular to an Al 2 o 3 and Fe 3 o 4 A method for composite catalytic pyrolysis of non-metallic powder of waste circuit boards. Background technique [0002] Printed Circuit Boards (PCB for short) is a kind of 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 electronic waste in EU countries was as high as 9.1 million tons, and the annual growth rate was 2.5% to 2.7%. In 2008, China's printed circuit board output was as high as 26% of the world's total, occupying the first place in the wo...

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

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