Circuit board electronic waste dismantling, crushing, sorting and recycling technology
Waste circuit boards contain a large amount of valuable resources such as ordinary metals and precious metals, organic resins, glass fibers, etc., and their recycling has good economic benefits. Recycling waste circuit boards is conducive to saving energy and improving the recycling rate of resources. , due to the high hardness and strong toughness of the printed circuit board base material, it requires high energy consumption for fine crushing. During the crushing process, part of the mechanical energy is converted into heat energy. Organic substances such as resins and plastics produce toxic gases due to local high temperatures, and will inevitably produce noise and contain glass. Dust from fibers and organic resins has an adverse effect on the environment.
The crushing and sorting process technology of circuit board recycling equipment adopts dry separation technologies such as crushing, screening, airflow classification, magnetic separation, and electric separation as the way out to solve the problem of recycling waste circuit boards at present and in the future. Firstly, the waste circuit board is broken into fine particles, and then separated according to the difference in physical properties of each component, generally including crushing, grinding, sorting and other treatment processes. After removing components and solder, use a shear crusher and a grinder with shearing and impact effects respectively to crush the waste board into a powder smaller than 1mm. After gravity sorting and electrostatic sorting and two-stage sorting, copper powder with a copper content of about 82% can be obtained, and more than 94% of the copper has been recovered. The resin and glass fiber mixed powder size is mainly between 100~300μm, which can be used as an additive for polymer products such as paints, coatings and building materials.
The recycling process mainly includes two-stage crushing, electrostatic separation, metal recycling and non-metallic material reuse. Firstly, the combination of shearing rotary crusher and impact rotary attritor is used for primary crushing and secondary crushing to achieve metal - The degree of full dissociation of non-metal, and then apply the roller corona-static composite electric field high-voltage electric separator to separate the metal particles and non-metal particles from the broken waste circuit boards.
The circuit board crushing and recycling process uses crushing, pulverization, winnowing, winnowing, specific gravity and high-voltage electrostatic separation to separate metals from non-metals, achieving a separation purity of 99.8% of metals and non-metals. Since electronic waste components are mainly composed of various metals, reinforced resin boards, copper wires attached to them, components, and various metals plated on them, they have high hardness and strong willfulness, so they need to be crushed by crushing technology. That is to say, crushing equipment with shearing effect can achieve better dissociation effect.
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