Master Magnets was tasked with the recovery of around 2,700 tonnes a year of ferrous and non-ferrous metals from a new waste treatment facility in Lahti, north-east of Helsinki.
The incoming material was sized into 3D and 2D fractions, with a range from 20mm to 200mm. An overband magnet was installed for the removal of general tramp iron.
A Mastermag 12PIL7 permanent in-line overband (pictured) was selected for the 3D fraction to work across the 1,000mm wide feed belt. Once cleaned of ferrous contaminants, the material was sent to a 1,000mm-wide eddy current separator (ECS) to have the non-ferrous fraction removed.
The finer 2D fraction required another overband magnet, this time for a slightly wider 1,250mm ECS to accommodate the lighter density material.
The customer can fine-tune the separation to retrieve the smallest of particles.