An environmentally friendly method for recycling waste polystyrene foam plastics belongs to the technical field of foam plastic recycling. Firstly, waste polystyrene foam plastics are pelletized, then the pellets are cleaned by a cleaning machine to remove impurities, dried, and added to an ethyl acetate solution for heating and dissolution. After complete melting, ethanol is added, and the mixture separates into layers: the upper layer is a mixture of ethanol and ethyl acetate, and the lower layer is polystyrene. After liquid separation, the lower-layer polystyrene is placed in a drying tower; steam is first introduced to wash away ethanol and ethyl acetate adhering to the polystyrene, and then hot air is introduced to dry the polystyrene. The invention uses environmentally harmless ethyl acetate and ethanol as solvents to dissolve polystyrene foam plastics, followed by layering, liquid separation and final drying. The process is simple with mild conditions, and the recovered polystyrene foam plastics have good quality with no adverse effect on reuse.

Country Code: CN

Application Number: CN201110367813.0