The SBS consists in a high speed rotating drum provided with hitting plates around its circumference that virtually “catapult” the particles as they are encountered during their free fall to the drum.
The larger the mass of a particle, the longer the trajectory it takes when thrown by the SBS.
The SBS separates the infeed Incinerator Ash into a short throw fines fraction (minus about 2mm) where moisture is concentrated and a large long throw fraction mainly made of solid pieces including the metals.