A kind of waste pcb recovery treatment method and recovery treatment device

Abstract

The present invention relates to the technical field of recycling and processing of metal resources, and more specifically relates to a method and device for recycling and processing waste PCBs, which are mainly composed of pyromelting, multi-stage combustion, atomization quenching, multi-tube cyclone dust removal, and pneumatic emulsification removal. Composed of acid, wet electrostatic dust removal and other processes, fully recover various metal components in waste PCBs, and at the same time make full use of the heat energy generated by the combustion process of polymer materials contained in the waste itself to reduce the addition and use of fuel, pyromelting process The generated smelting slag can be used as road filler or construction auxiliary material to realize the green and clean resource recycling of waste PCB. The invention has significant advantages such as compact technological process, reasonable investment, high efficiency and no pollution, etc., can bring better economic benefits to waste PCB processing manufacturers, and also has higher comprehensive environmental and social benefits.

Description

technical field [0001] The present invention relates to the technical field of recycling and processing of metal resources, and more specifically, to a method and device for recycling and processing waste PCBs. Background technique [0002] Printed circuit board (PCB) is widely used in the electronic and electrical industry, and is one of the key components of various electronic and electrical appliances, especially in bulk electronic products such as computers and televisions. On the one hand, a large number of defective products and scraps will be produced in the process of circuit board production. On the other hand, a large number of waste PCBs will be dismantled in the recycling process of various electronic and electrical products after they are scrapped. Effective resource utilization will bring certain economic benefits to waste electronic and electrical product processing units, as well as social and ecological benefits such as saving resources and protecting the en...

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Problems solved by technology

[0003] At present, the general recovery and treatment methods for discarded PCB solid waste mainly include physical separation, wet chemical method, vacuum cracking treatment method and pyromelting method, among which: (1) physical separation method, mainly through the relevant mechanical equipment The circuit board is crushed and ground until it reaches a sufficient fineness, and then the metal components are separated by sorting equipment such as a shaker. However, this method consumes a lot of energy, the separation is not complete, the waste of resources is serious, and there is a certain hidden danger of environmental pollution. (2) Wet chemical method, which mainly utilizes strong oxidizing media such as nitric acid and aqua regia to dissolve metals in waste circuit boards and recycle them. The reagent consumption of this method is large, the process is complicated, and a large amount of waste water is produced. Improper treatment will cause serious problems. The water pollution, waste of resources and environmental pollution are very serious; (3) vacuum cracking treatment method, the waste circuit board is heated to a suitable temperature, so that the polymer resin in the waste material is decomposed into volatile organic compounds, and these volatile organic compounds are re- Under certain conditions, the condensed organic liquid can be recycled, and then the residual material from which the organic matter has been removed is physically separated or pyromelted. The key is that the cracking equipment is difficult to scale and continuous production and the subsequent deep processing and utilization of cracking oil is difficult to achieve. Therefore, this method has not yet been applied in industrialization; (4) Pyromelting method, the process is simple, continuous or semi-continuous production and high metal recovery rate, but the polymer organic matter in the waste circuit board is not fully burned during the smelting process. A large amount of harmful gas may be produced, and the exhaust gas will cause air pollution after improper treatment and discharge into the air

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