Any item can be damaged by continuous use, especially electronic products. However, damaged items are not completely waste and can be recycled, as is PCB. Moreover, with the progress of science and technology, the number of electronic products has increased sharply, which has shortened their service life. Many products are discarded without damage, resulting in serious waste.

Products in the electronics industry are updated very quickly, and the number of discarded PCBS is also staggering. Every year, the UK has more than 50,000 tons of waste PCBS, while Taiwan has as much as 100,000 tons. Recycling is the principle of saving resources and green production. Besides, some substances on electronic products will be harmful to the environment, so recycling is indispensable.

The metals contained in PCB include common metals: aluminum, copper, iron, nickel, lead, tin and zinc, etc. Precious metals: gold, palladium, platinum, silver, etc. Rare metals rhodium, selenium and so on. PCB also contains a large number of polymer directly or indirectly in petroleum products, with high calorific value, they can be used to generate energy, but also the production of related chemical products, many of the components are toxic and harmful, if discarded will cause great pollution.

PCB templates are made up of multiple elements that can be recycled even if they are not used properly. So, how to recycle, we introduce its steps:

1. Take off the lacquer

The PCB is coated with protective metal, and the first step in recycling is to remove the paint. Paint remover has organic paint remover and alkaline paint remover, organic paint remover is toxic, harmful to human body and environment, can use sodium hydroxide, corrosion inhibitor and other heating dissolution.

2. The broken

After the PCB is removed, it will be broken, including impact crushing, extrusion crushing and shear crushing. The most commonly used is the ultra-low temperature freezing crushing technology, which can cool down the tough material and crush it after embrittlement, so that the metal and non-metal are completely dissociated.

3. Sorting

The material after crushing needs to be separated according to the density, particle size, magnetic conductivity, electrical conductivity and other characteristics of its components, usually by dry and wet sorting. Dry separation includes dry screening, magnetic separation, electrostatic, density and eddy current separation, etc. Wet separation has hydrocyclone classification, flotation, hydraulic shaker, etc. And then you can reuse it.