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          What's the use of recycled printed circuit boards?

          2021-07-17 291

            There are two main sources of throwing away printed circuit boards, one is the printed circuit boards contained in the discarded electronic and electrical products, and the other is the leftover materials and waste products formed in the production process of printed circuit boards. From computer, TV to electronic toys, almost all electronic products contain printed circuit board. Therefore, once electronic and electrical products are thrown away, a lot of circuit boards will be thrown away. With the rapid development of science and technology, electronic and electrical products are selected faster and faster, which will constitute a lot of circuit boards.

            In addition, according to the relevant information, the scraps of printed circuit board in the production process due to the cutting process are as high as 24%. The printed circuit board is mainly composed of organic reinforced resin, glass fiber, copper foil and electronic components. It contains a lot of valuable metals such as copper, iron, aluminum, tin, lead, etc., as well as precious metals such as gold, silver, platinum, palladium, etc., which has high resource recovery value.

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            However, there are many kinds of heavy metals such as lead, mercury, cadmium, chromium and toxic and harmful substances such as PVC and halogen flame retardants in the discarded circuit board. Improper treatment will cause serious secondary pollution to the environment. Therefore, it is of great significance to reduce the 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.

            The mechanical treatment method is to throw away the circuit board, break it into fine particles, and then complete the separation according to the differences of physical properties of the components. It generally includes crushing, grinding, sorting and other treatment processes. After the components and solder are removed, the waste plate is crushed into powder less than 1 mm by shear crusher and impact grinder respectively. After gravity separation and electrostatic separation, the copper powder with 82% copper content can be obtained, and more than 94% copper can be recovered. The mixed powder size of resin and glass fiber is mainly in the range of 100 ~ 300 μ It can be used as additive for polymer products such as paints, coatings and building materials.

                The article comes from:http://www.marysbrideandformals.com

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