The main ways of recycling polystyrene foam board are: granulation after volume reduction, crushing and used as various filling materials, cracking to make oil or recycling styrene and others.

1. Pelletizing after volume reduction: Polystyrene foam can be melt-extruded and pelletized to make recycled pellets, but it is bulky and inconvenient to transport. Usually, it needs to be reduced in volume during recycling. Methods include mechanical method, solvent method and heating method [2].

2. Use as filler after crushing: Polystyrene foam products can be used as filler after crushing to make various products.

①Remolded into foam plastic products

②Concrete composite panel products

③Gypsum sandwich brick

④Used as asphalt reinforcing agent

⑤Used as soil modifier

3. Pyrolysis to oil or recovery of styrene: The device for the method of pyrolysis of waste polystyrene foamed plastics to oil is as follows:

Waste polystyrene foam pretreatment, heat treatment, volume reduction, catalytic cracking, rectification of styrene

4. Others: waste polystyrene foam can be used to make coatings and adhesives, etc.

①Coating: After the expandable polystyrene foam is crushed, it can be made into paint by adding an appropriate solvent.

Styrofoam is useful for polystyrene bead molding. Styrofoam used for packaging such as household appliances or frozen food packaging; there are also a few instant noodle bowls that are injection-molded with expandable polystyrene beads. These plastic products are bulky and cost a lot of tuition and miscellaneous fees, and their recycling is particularly valued in China.

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