Plant and method for sorting polymeric waste

A method for sorting polyolefin-based waste, comprising steps of:

• providing a mass of loose waste deriving from the separate collection of plastics;
• dosing the loose waste in order to obtain a flow of material to be treated having a controlled flow rate;
• removing the macroscopic metal fragments from the flow of material to be treated;
• removing from the flow of material to be treated the non-polyolefin polymers;
• removing from the flow of material to be treated the cellulosic components and the textile components;
• removing from the flow of material to be treated the foreign bodies with dimensions smaller than a predefined minimum value;
• reducing the particle size of the material to be treated to a predefined value;
• and
• removing the metal fragments from the flow of material to be treated;
• wherein, after the steps of removing the macroscopic metal fragments, removing the non-polyolefin polymers, removing the cellulosic components and the textile components, removing the foreign bodies (108), and reducing the particle size of the material to be treated, the method further comprises the steps of:
• removing the three-dimensional polyolefin fraction, comprising the polyolefin fragments with bulk density higher than a predefined threshold value;
• and
• making available the two-dimensional polyolefin fraction, comprising the polyolefin fragments with bulk density lower than the predefined threshold value,
• wherein the two-dimensional polyolefin fraction comprises polyolefins, a percentage of less than 20% of extruded polystyrene and a percentage of less than 2% of metal fragments and/or foreign bodies.