1. Material is usually dispensed from the hoppers using an screw conveyor . 2. From there the material goes on a horizontal screw conveyor . 3. The principle of the operation is the inverse of the screw conveyor . 4. Screw conveyors can be operated with the flow of material inclined upward.5. The funnel can be equipped with a collecting screw conveyor if necessary. 6. Water addition may be conducted in either a screw conveyor or a pugmill. 7. At the end of the funnel is the inlet for the screw conveyor or the extraction pipe. 8. Two systems were prototyped and tested; a screw conveyor system and a novel cyclonic separator and vacuum system. 9. At the end of the screw conveyor there is a knife installed directly in front of the fixed hole plate. 10. The first type of screw conveyor was the Archimedes'screw, used since ancient times to pump irrigation water.
