Method and system for treating circuit board

Abstract

The invention discloses a method and a system for treating a circuit board. The method comprises the following steps: (1) breaking the circuit board; (2) pyrolyzing the broken circuit board in a radiant tube revolving bed to obtain high-temperature oil gas and a solid mixture; (3) performing first separation on the high-temperature oil gas to respectively obtain pyrolysis oil and pyrolysis gas and supplying the pyrolysis gas to the radiant tube revolving bed to be used as fuel; (4) contacting flue gas with the obtained solid mixture to activate the solid mixture, thereby transforming the pyrolysis carbide in the solid mixture into activated carbon; (5) performing second separation on activation products so as to respectively obtain activated carbon, metal and inorganic glass fibers. According to the method disclosed by the embodiment of the invention, circuit board resources can be recovered and energy can be utilized to the maximum.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular, the invention relates to a method and system for processing circuit boards. Background technique [0002] With the rapid development of science and technology, electronic products have become an indispensable daily necessities for people. With the continuous acceleration of electronic product replacement, waste electronic waste and scraps formed during the processing of electronic products are also increasing day by day. In developed countries such as Japan, the United States, and the European Union, the annual output of e-waste accounts for 1%, 2-5% and 4% of urban waste, and grows at a rate of 16%-28% every five years, which is 3 times the growth rate of urban waste. ~5 times. This situation is particularly serious in my country. my country not only has a large population, but also is the main place for dumping e-waste in developed countries. Statistics show that 80% of e-waste ...

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Problems solved by technology

Among them, the mechanical physical separation method is easy to scale, and the pollution to the environment is relatively small, but various metals cannot be completely separated, and the remaining organic matter is either landfilled or incinerated, which not only wastes resources but also seriously pollutes the environment; the metal recovery rate of hydrometallurgy is high. , but the consumption of chemical reagents is large, the process is complicated, and the polymer organic compounds in the circuit board have not been recycled; the biometallurgy technology is still in the research stage, and the suitable bacteria are very few and difficult to cultivate; in comparison, thermal Pyrolysis technology can not only effectively utilize the high molecular organic materials in them, decompose them into fuel oil, gas and carbide, but also make it easier to separate the pyrolysis products and recover metal and glass fiber in circuit boards, resources High utilization rate

[0004] At present, the pyrolysis of waste printed circuit boards mainly adopts the method of vacuum pyrolysis or microwave pyrolysis. Most of these two methods are still in the stage of laboratory research, and have high requirements for equipment. Most of the melting furnaces are small laboratory-scale equipment, which not only has a small processing capacity, but also cannot operate continuously. If it is used in industrial production, it will consume a lot of energy to maintain the vacuum state in the furnace or continue to generate microwaves, so it is difficult to achieve industrialization and mass production

At the same time, most of the recovery and utilization methods for products published are focused on the refining of pyrolysis oil and the recovery of metals in solid products, and no further utilization of other products

[0005] Therefore, the existing processing methods for circuit boards need to be further studied

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