Among the various residues from waste incinerator there is heavy slag formed from unburned waste, containing in addition to glass and other inert materials, different metals, ferrous and non-ferrous, such as aluminium, steel, copper and brass.
The incinerator slag treatment process requires the use of eddy current separators, and sensor-based sorters for the concentration of non-ferrous metals and the Heavy Media plant for the separation of aluminium from the other metals.
The type of separator used for the treatment of non-ferrous metals from incinerator slag is the single-density Single-Stage Drum Separator used to separate Aluminium from heavy metals. It is not necessary to use the Double-Stage Drum Separator since Magnesium, which is present in the slag in a smaller amount than Zorba, burns in the incinerator.
The incinerator slag contains a high quantity of fine dusts, and therefore it is necessary to remove them before they mix with the media. Protec provides its own complete Sink-Float plant fitted with prewash drum and sludge treatment plant.
This type of application requires using a high density obtainable with a mixture of water and Ferrosilicon.
‘Float’ –>>> Aluminium
‘Sink’ –>>> mixed high density non-ferrous metals