There are two main sources of discarded circuit boards: one is the printed circuit boards contained in discarded electronic and electrical products, and the other is the scraps and scrap materials formed during the production process of 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, there will be a lot of discarded circuit boards. With the rapid development of technology, the screening speed of electronic and electrical products is getting faster and faster, which will result in many discarded circuit boards.

In addition, according to relevant materials, the production process of printed circuit boards generates up to 24% of scraps due to cutting techniques. Abandoned circuit boards are mainly composed of organic reinforced resin, glass fiber, copper foil, and electronic components, which contain many valuable metals such as copper, iron, aluminum, tin, lead, etc., as well as precious metals such as gold, silver, platinum, palladium, etc., and have high resource recovery value.

However, discarded circuit boards still contain various heavy metals such as lead, mercury, cadmium, chromium, as well as toxic and harmful substances such as polyvinyl chloride and halide flame retardants. Improper handling can cause serious secondary pollution to the environment. Therefore, it is of great significance to effectively complete the harmless recycling of discarded circuit boards, achieve their recycling, reduce environmental pressure and prevent environmental pollution, improve the reuse rate of secondary resources, and ensure the sustainable development of China's economy, society, and environment.

Mechanical processing is a method of discarding circuit boards and breaking them into fine particles, and then separating them based on the differences in physical properties of each component. It generally includes processing techniques such as crushing, grinding, and sorting. After removing the components and solder, use a shear crusher and a grinder with cutting and impact effects to crush the waste board into powder smaller than 1mm. After two levels of gravity and electrostatic separation, copper powder with a copper content of about 82% can be obtained, and over 94% of the copper is recovered. The scale of resin and glass fiber mixed powder is mainly between 100~300 μ m, which can be used as an additive for polymer products such as paints, coatings, and building materials.

Article from Jiangmen PCB Customizationhttp://www.yonghongpcb.com