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The collection systems for fumes produced by an electric arc furnace (EAF) for steel mills, generate 10 to 20 kg of dust per tonne of steel. Dusts are mainly composed of iron oxides and zinc oxides, which are partially bound in the form of ferrites, beside other metal oxides (i.e. Pb, Cu, Cd, etc.) and alkaline oxides (Ca, Mg, Na, K, etc.).

The research was aimed at determining optimum conditions for the total recycling of EAF dusts, by measuring the economic value of each element.

To this end, a hydro-metallurgical extraction, separation and reclaiming system of all non- ferrous metals was implemented, wherein all ferrous items were to be recycled and reused in the electric arc furnace.

The plant called EzineX (R) (patent No CHO1352/93-9) was used. A hydro-metallurgic system treats the dust produced and recycled in the electric arc furnace.

This system allows to carry out the extraction of nearly pure zinc metal in the form of cathodes; the separation of lead and heavy metals in the form of cements, and the production of a ferrous residue which, once it has been dried, converted into pellets and mixed to reductants, is introduced into the electric furnace to recover iron.

For over two years, trials have been carried out at the EAF and the research proved that furnace recycling of this fraction is feasible and does not cause any process or product anomalies; moreover it is more economical than other currently used fume collection systems.

Additional information

Authors: BIANCO L, Ferriere Nord SpA, Zona Industriale Rivoli di Osoppo, Udine (IT);CESCHIA C, Ferriere Nord SpA, Zona Industriale Rivoli di Osoppo, Udine (IT);PORISIENSI A, Ferriere Nord SpA, Zona Industriale Rivoli di Osoppo, Udine (IT)
Bibliographic Reference: EUR 19393 EN (2000), 78pp, Euro: 11.50
Availability: Available from European Commission, DG XII Communication Unit rue de la Loi/Wetstraat 200, B-1049 Bruxelles (BE) Tel: +32-2-2950001 Fax:+32-2-2958220 email:
ISBN: ISBN 92-828-9004-X
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