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The quantities of the dusts, scales and sludge arising in the steel plants of Rautaruukki Group (two in Finland, one in Sweden and one in Norway) and Imatra Steel (in Finland) have been determined. Not all materials can be recycled, a material may contain some harmful component(s) like Na, K, Zn, Pb, Cd, S, cyanide, oil or humus. It may also be too fine-grained and a small iron content may prevent...