Slags are the heavy ashes that result from the waste incinerated at the Energy Recovery Center, and are then separated into ferrous metal, non-ferrous and inert metal.
For the separation step, the material is taken to a Slag Treatment and Recovery Facility. After the materials get distinguished, the metal is sent for recycling and is produced aggregate for road construction.
As a product certified with CE marking, the aggregate can be used in road construction, landfill cover and other applications, constituting a product of high potential.
For the metal, it should be noted that is removed from the slag ferrous material sufficient for the construction of 16,500 automobiles per year.
The slag is treated at the Valorsul facility in Vila Franca de Xira, in operation since 2000. For more information, access here.