Abstract: Plant for the recycling of heterogeneous discard material of at least partly thermoplastic type, comprising a hot extrusion unit (18) in which the discard material is transformed into a fluid mix (20) suitable to be subjected to subsequent proceesing. The extrusion unit (18) comprises a substantially tubular body (27) defining an extrusion chamber and having an inner wall (32), inside which at least an extrusion screw (38) is housed. The distance (d) between the tips each extrusion screw (38) and the inner wall (32) is in the range of a few millimeters.