Danieli & C. S. p. A. (Buttrio, Italy):

A. Primavera, e-mail: a.primavera@danieli.it

D. Braga

S. Tiburzio

Centro Sviluppo Materiali S.p.A. (Rome, Italy):
E. Faraci

A new, patent pending technology has been developed by Danieli for the recovery of the valuable metals from the ASR and the utilization as reductantcombustible into the EAF in partial substitution of the metallurgical carbon. The proposed route is environmentally friendly because it avoids the dumping of material and allows the recovery of marketable metals (or directly usable in the steel plant as the Fe). The eventual issue related to the gaseous emissions is easy to manage with the existing and applied technology (as the activated carbon injection). The ASR sorting tests performed after the ASR granulation, demonstrated the possibility to recover metals that represents 10% in weight of the ASR. Only some traces of metals can remain inside the plastic fraction that, after the treatments, produces the synthetic carbon. The determination of the plastic mixture composition and calorific values allowed to confirm the possibility to use them as carbon substitution into the EAF. The thermogravimetry and the gas analysis demonstrated the fast decomposition of the plastic mixtures between 400 and 500 °C. The gas analysis moreover demonstrated that the evolved gas is mainly composed of CnHm that allows, after the reaction into the slag, the increase of foaming and decrease of electric energy consumption and increase of the yield of the furnace. The potentiality of the mixed plastic mixtures to increase the carbon content in the liquid steel has been analysed with open and closed furnaces.

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