Wareham Skip Hire came to Waste Recycling Technologies with a problem on how to improve there trommel fines to meet the new level of Loss of Ignition (“LOI”) threshold.
On their existing plant the trommel screen is separating at 40 mm with the -40mm discharging into a bay under the screen. So a new conveyor system was installed to conveyor the trommel fines up to a secondary screen. The material first passed under an overband magnet which removed the ferrous material the remaining material is then conveyed on to a star screen to remove the -10mm fines with the 10/40 material then passing under a Air-Vac air suction separation system to remove lighter material which discharges into a covered skip. The clean 10/40 material then discharge into bay.
As a result of the new fines clean up the -10mm fines now has less than 4% L. O. I. well within the new threshold of 10%