Circuit board crushing and sorting technology, circuit board recycling technology
1. The source of discarded circuit boards
There are two main sources of waste circuit boards, one is the printed circuit boards contained in the discarded electronic and electrical products, and the other is the scrap and scraps formed during the production of the printed circuit boards. From computers, televisions to electronic toys, almost all electronic products contain printed circuit boards. Therefore, once electronic and electrical products are discarded, a large number of discarded circuit boards will be generated. With the rapid development of technology, electronic and electrical products are being eliminated faster and faster, and a large number of discarded circuit boards will be formed. In addition, according to relevant data, the scrap produced by the cutting process during the production of printed circuit boards is as high as 24%.
2. Material composition of discarded circuit boards
The recycling of discarded circuit boards relies to a large extent on the understanding of their material composition and structure. Therefore, it is necessary to determine the composition and content of various substances on discarded circuit boards from a qualitative and quantitative perspective. The substrate material of the printed circuit board is usually glass fiber reinforced phenolic resin or epoxy resin, on which various components are welded, the composition is very complex, and it contains a variety of metals, which has a high resource recovery value. At present, many researchers have studied the composition and structural characteristics of discarded circuit boards, and the results show that the composition and content of elements in circuit boards corresponding to different electronic products are different.
The circuit board crushing and recycling process uses crushing, crushing, winnowing, winnowing, specific gravity and high-voltage electrostatic separation to separate metals and non-metals to achieve 99.8% separation purity of metals and non-metals. Since the electronic waste components are mainly composed of various metals, reinforced resin plates and copper wires attached to them, components and various metals on the plating, they have high hardness and strong willfulness, so they need to be crushed by a crushing process. That is, the crushing equipment with shearing effect can achieve a better dissociation effect.
Circuit board recycling equipment can fully dig out the treasures in this pile of "waste", circuit board recycling equipment can separate metal and non-metal substances in electronic waste, and the impurities after sorting can be less than 1%, that is, sorting The effect can be up to 99%, and it is a complete physical separation. After the circuit board recycling equipment is separated, the properties of various materials will not change, and the recycling will not be affected. It has the outstanding advantages of environmental protection, efficiency improvement, energy saving, production improvement, time saving and labor saving.
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