Method and device for comprehensively recycling waste printed circuit boards

Abstract

The invention discloses a method for comprehensively recycling waste printed circuit boards, which comprises the following: a step of waste printed circuit board gasification, which is to crush the waste printed circuit boards, feed the crushed waste printed circuit boards into a molten salt reacting furnace, perform gasification at the temperature of between 700 and 900 DEG C to obtain gasified residues and a gas product which contains a large amount of tar, allow the gasified residues to layer in molten salt, discharge the layered products from different positions of the molten salt reacting furnace and recycle the products respectively; a step of bromine-containing pollutant removal, which is to release bromine (Br) from the waste printed circuit boards in a form of hydrogen bromide (HBr) when the waste printed circuit boards are gasified, wherein the released acid HBr is instantly absorbed by alkali molten salt and a small amount of bromine-containing organic materials generated at the same time are cracked and absorbed by the molten salt under the catalysis of the molten salt; and a step of gas product reforming, which is to introduce the mixture of the gas product containing a large amount of tar, oxygen-enriched air and vapor according to a ratio of 1: (0.4-0.7): (1-5) into an airflow bed, reform at the temperature of between 1,200 and 1,500 DEG C, regulate the ratio of hydrogen (H2) to carbon monoxide (CO) in the gas to 0.8 to 2 and convert the tar in the gas product at a high temperature in the airflow bed.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a device and method for energy utilization of printed circuit boards and recycling of inorganic fillers and metals such as copper and aluminum in the circuit boards. Background technique [0002] Waste printed circuit board (Printed circuit board, PCB) is the basis of the electronics industry, widely used in computers and components, communication equipment, measurement and control instruments, household electronic appliances and other fields. Due to the rapid replacement of products in the electronics and information industries, the amount of waste printed circuit boards produced is also very alarming. In recent years, the average growth rate of waste printed circuit boards in the world has reached 8.7%, and the annual growth rate in Southeast Asia is 10.8%, while the growth rate in my country is as high as 14.4%. In 2006, the output value of waste printed circ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the technical problem of low comprehensive utilization rate of waste printed circuit board treatment methods in the prior art, and provide a method based on the principle of thermochemical conversion, which combines gasification and bromide removal, and makes full use of waste printed circuit boards. Energy resources in boards, recycling inorganic fillers and precious metals such as copper and aluminum, and realizing efficient and low-pollution comprehensive treatment methods and devices for waste printed circuit boards

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