Mechanical processing technology of circuit board recycling equipment

Time：2023-01-12 15:56:59

Starting from the dismantling of electronic waste, to the production line (including equipment and technology) where all waste is applied, especially after the waste circuit board is crushed to recycle metal copper and other metals, the remaining resin ring fiber powder is discarded arbitrarily. The resin ring fiber powder can be made into glass-plastic mixed particles after being mixed with plastic and reinforcing agent. This glass-plastic mixed granule can be used to make the glass-plastic layer of the floor.

Circuit board recycling

The recycling process of circuit board recycling equipment mainly includes two-stage crushing, electrostatic separation, metal recycling and reuse of non-metallic materials. First, the combination of rotary crusher and impact rotary grinder is used for primary crushing and secondary crushing to achieve the degree of full dissociation of metals and nonmetals, and then the roll-type corona-electrostatic compound electric field high-voltage electric separator is applied, Sorting metal particles and non-metal particles for broken waste circuit boards. For the above-mentioned mechanical processing technology, dissociation of monomers of various materials as fully as possible is a prerequisite for efficient separation.

Circuit Board Recycling Flowchart

The degree of crushing of waste circuit boards not only affects the energy consumption of the crushing equipment, but also affects the subsequent sorting efficiency, so crushing is a key step. Due to the high hardness and strong toughness of the printed circuit board substrate, fine crushing requires high energy consumption. During the crushing process, part of the mechanical energy is converted into heat energy. Organic substances such as resins and plastics will produce toxic gases due to local high temperatures, and will inevitably generate noise and contain glass fibers. , Organic resin dust, causing adverse effects on the environment.

The recycling of waste circuit boards depends largely on the understanding of its material composition and structure. Therefore, it is necessary to determine the composition and content of various substances on waste circuit boards from a qualitative and quantitative perspective. The substrate material of the printed circuit board is usually glass fiber reinforced phenolic resin or epoxy resin, on which various components are welded, the composition is very complex, and it contains a variety of metals, which has a high resource recovery value.

Circuit board recycling equipment is a set of procedures for dismantling and separating scrapped circuit boards into metal and non-metal. The circuit boards with electronic components are removed after tin removal and disassembly, without dismantling electronic components. It can also be crushed and separated directly. The circuit board completes the dissociation of metals and non-metals through coarse crushing, iron removal, and fine crushing to form a mixture of metals and non-metals, which enters the air flow specific gravity sieve to extract most of the metals. The circuit board fiber powder sieved out by air flow specific gravity contains a small amount of fine metals, and then enters the electrostatic separator to extract the remaining fine metals, achieving a very high metal recovery rate, close to 100%.