Electronic products will damage the continuous use, any especially, damage to the goods is not completely waste, however, can be recycled, PCB is the same. And, along with the progress of science and technology, the number of electronic products has increased dramatically, the life cycle shorten constantly, many products are not damaged will be discarded, cause serious waste.
Electronics industry upgrading products very fast, with a surprisingly high number of PCBS and also. Each year, Britain has more than 50000 tons of PCBS, Taiwan and China is as high as 100000 tons. Recycling, is the principle of resource saving, green production, and there are some material on electronic products can be harmful to the environment, recycling is inevitable.
Metal is contained in PCB, with ordinary metal: aluminum, copper, iron, nickel, lead, tin and zinc, etc.; Precious metals: gold, palladium, platinum, silver, etc.; Rare metal rhodium, selenium, etc. PCB also contains a large number directly or indirectly in the polymers derived from petroleum products, has a high calorific value, take advantage of them can produce energy, can also be related chemical product, most of these ingredients are poisonous and harmful, if discarded caused great pollution.
PCB sample is composed of a variety of elements, even can’t normal use, one of the elements can be recycled. So, how to recycling, pater PCB below small make up to explain its simple steps:
1, take off the lacquer
PCB surface coated with metal protection, recycling the first step is to take off the lacquer. Paint remover has organic paint remover and alkaline paint remover, organic paint remover is toxic, and environmental harm to human body, can use the sodium hydroxide, such as corrosion inhibitor melted.
PCB after the demolition, will be broken, broken impact crushing, extrusion and shear breakage. Commonly used is the ultra-low temperature freezing technology and tough material can be cool, after the embrittlement of the pieces, and makes the metal and nonmetal completely disintegrate.
After crushing material, need according to the density of its various components, particle size, permeability, conductive properties such as sorting, usually with dry and wet separates. Dry separation including dry sieving, magnetic separation, electrostatic, density and eddy current separation, etc. Wet separation hydrocyclone classification, flotation, hydraulic table, etc. Sorting out the material, can be recycled.