Disclosed is a separation apparatus comprising a conveyor; and a material separator positioned above a conveyor, the conveyor being arranged to convey a mixture of materials to the material separator; the material separator comprising a suction duct comprising a sidewall which defines a passageway linking an inlet positioned adjacent the conveyor to an outlet positioned away from the conveyor; and an airflow generator arranged to blow air through a slit in the sidewall into the passageway at a position between the inlet and the outlet; wherein, in use, the airflow generator blows air through the slit in a direction which is towards the outlet for creating a pressure difference between the inlet and the outlet thereby generating an airflow which causes relatively low density materials to be lifted from the conveyor and sucked into the passageway.