Writer： admin Time：2020-11-19 10:08 Browse：℃
Waste circuit boards contain a large number of valuable resources such as common metals and precious metals, organic resins, glass fibers, etc., and their recycling has good economic benefits. The recycling of waste circuit boards is conducive to energy saving and improving resource recycling rate. , Due to the high hardness and toughness of the printed circuit board substrate, it requires large 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 will generate toxic gases due to local high temperatures, and will inevitably produce noise and contain glass. The dust of fiber and organic resin has an adverse effect on the environment.
The circuit board recycling equipment crushing and sorting technology adopts dry separation technologies such as crushing, screening, air classification, magnetic separation, and electric separation as the way out to solve the problem of recycling of waste circuit boards at present and in the future. The method of first crushing the waste circuit board into fine particles, and then realizing the separation according to the difference of the physical properties of each component, generally includes processing processes such as crushing, grinding, and sorting. After removing the components and solder, use a shearing crusher and a grinder with shearing and impact functions to pulverize the waste board into powder less than 1mm. After two-stage separation, gravity separation and electrostatic separation, copper powder with a copper content of about 82% can be obtained, of which more than 94% of the copper is recovered. The size of the mixed powder of resin and glass fiber 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. First, a combination of a shear rotary crusher and an impact rotary grinder is used for primary and secondary crushing to achieve metal -The degree of full dissociation of non-metals, and then the use of roller corona-electrostatic composite electric field high-voltage electric separator to separate the metal particles and non-metal particles of the crushed waste circuit boards.
The circuit board crushing and recycling process uses crushing, crushing, winnowing, winnowing, specific gravity and high-voltage electrostatic separation to separate metals and non-metals to achieve 99.8% separation purity of metals and non-metals. Since electronic waste components are mainly composed of various metals, reinforced resin plates and copper wires attached to them, components and various metals on the plating, they have high hardness and strong willfulness, so they need to be crushed by a crushing process. That is, the crushing equipment with shearing effect can achieve a better dissociation effect.
Add: Henan Communication Industrial Park) 5th St., Economic-Technological Development Zone, Zhengzhou