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The process concept investigated in this ECSC project has been the co-treatment of steel plant slags and all in-plant by-products and the transfer of them by reduction or vitrification into value-added final products.

The reduction route has been a treatment in a 3 MW DC furnace with a hollow electrode, where tests were performed in three campaigns. Slag products of satisfactory quality, hydraulic binder, metallurgical powder, clinker material and vanadium slags were produced with BOF slags as base material.

The fine-grained by-products treated include BF sludge, BOF sludge, oily mill-scale, EAF dust and scrap residue. Recoveries reached were over 95% for iron and chromium and over 80 per cent for vanadium.

The DC furnace has proved an excellent tool for melting and reduction of fine-grained material as long as all material is fed through the electrode.

The pilot tests were based on separate low-temperature pre-treatment before final melting/vitrification. Most of the remaining zinc and lead are found in the final product, which meets the Italian demands on leachability.

The major technical/metallurgical issues are clarified and the costs for Greenfield installation are roughly estimated. Possible product mixes are discussed but the value of these products has not been assessed due to the need of further development and extensive market studies. studies.

Additional information

Authors: BURSTROM E, MEFOS, Lulea (SV);YE G, MEFOS, Lulea (SV);PIRET J, CRM, Liege (BE);CIMARELLI T, CSM, Rome (IT);KUHN M, FIEhS, Duisberg (DE)
Bibliographic Reference: EUR 20068 EN (2002), pp.101. Euro: 16:00
Availability: EUR-OP Reference:KI-NA-20068-EN-S. Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-2148-7
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