| 摘要 |
This novel multistage process recovers secondary materials from tailings, soiled plastic, tipped waste, household waste, screen rakings and grit from sewage works. A first plant section treats dried waste on site. At the point of delivery a mobile screen separates e.g. waste, sieve residues from composting, soiled plastic and tipped waste from bulk material larger than 150 mm through a drum screen. There is a controlled size reduction stage including a sack destructor. is used, or the closed. The screening separates a fine, mainly biogenous fraction smaller than 40mm/25mm grading size. The medium fraction 10/15mm to 25/40mm is transported in suitable road containers. Fine material from a second fine sieving is supplied to metal inductive separation, followed by intensive composting. In accordance with its quality, it may be used for agriculture after maturation. Coarse material undergoes magnetic separation, ferrous metal being containerised, together with any plastic sheet pulled out with it. During this process, further screening or air classification separates the sheets from the ferrous material. Residues from the coarse fraction are passed from a trough conveyor onto a mobile inspection and sorting table for visual inspection and sorting. Material is separated which can cause malodour or have a later effect on quality. |
