In 1997, Sweden used copper-smelting slag beneath a road near Luleå; after 10 years, copper, nickel and zinc leaching ...
In modern times, the words ‘waste’ and ‘safe’ rarely sit comfortably in the same sentence. However, in 1997, researchers in northern Sweden decided to use some slag from copper smelting as a sub-base material for a public road outside Luleå. The question …