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Circuit board recycling equipment crushing and sorting process technology

Time:2020-05-19 12:25 Author:Suny Group

Abandoned circuit boards contain a large amount of valuable resources such as common metals and precious metals, organic resins, glass fibers, etc., which has very good economic benefits for recycling. Recycling of used circuit boards is conducive to saving energy and improving the recycling rate of resources Due to the high hardness and toughness of the substrate of the printed circuit board, the fine crushing energy consumption is required. During the crushing process, some mechanical energy is converted into heat energy. Organic materials such as resins and plastics produce toxic gases due to local high temperature, and will inevitably produce noise and contain glass. The dust of fiber and organic resin has an adverse impact on the environment.

Circuit board recycling equipment
Circuit board recycling equipment

The crushing and sorting process technology of circuit board recycling equipment adopts dry separation technologies such as crushing, sieving, air classification, magnetic separation, and electrical separation as the way out to solve the problem of recycling of waste circuit boards at present and in the future. First, the waste circuit board is broken into fine particles, and then the separation method is achieved according to the differences in physical properties of each component, which generally includes processing processes such as crushing, grinding, and sorting. After removing the components and solder, use a shear crusher and a grinder with shearing and impact effects to crush the waste board into a powder of less than 1mm. After two stages of gravity separation and electrostatic separation, copper powder with a copper content of about 82% can be obtained, and more than 94% of the copper is recovered. The size of the resin and glass fiber mixed powder is mainly between 100 and 300 μm, and 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 recovery and reuse of non-metallic materials. First, a combination of shear rotary crusher and impact rotary mill is used for primary crushing and secondary crushing to achieve metal -The degree of full dissociation of non-metal, and then apply roller corona-electrostatic composite electric field high-voltage electric separator to separate the metal particles and non-metal particles of the broken waste circuit board. The circuit board crushing and recycling process is to separate metals and non-metals by means of crushing, crushing, air separation, air separation, specific gravity and high-voltage electrostatic separation, to achieve 99.8% separation purity of metals and non-metals. Since the electronic waste components are mainly composed of various metals, reinforced resin plates and copper wires attached to them, components and various metals that are plated, etc., they have high hardness and strong willfulness, and need to be broken by a crushing process. That is, the crushing equipment with shearing effect can achieve better dissociation effect.

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