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Final report on Contract No 7215-PP/012, 1 July 1998 to 30 June 2001.

An innovative pyro-hydrometallurgical treatment aimed at recovering metallic zinc from powders rich in ZnO has been realized. These powders are produced from the thermal fumigation of EAF dusts (mix of dusts manufactured from carbon steel and stainless steel) in an arc-plasma furnace, producing ferroalloys, totally inert slag and ZnO-rich powders. These powders are treated via a hydrometallurgical process and the zinc produced has a purity higher than 99.90 % (zinc of high-grade quality).

The treatment cycle consists of a pyro-metallurgical phase, followed by a hydrometallurgical phase and electrolytic deposition. The electrolysis has been carried out with a current of 6.000A and with a voltage of 3.55 V for a series of 10 cathodes and with a voltage of 10.7 V for three series of cathodes. The average chemical-physical characteristics of produced zinc samples are:
- density = 7010 (kg/cubic cm)
- Zn = 99.96 (mass %).

Technical-economic evaluation of Full-Rec technology, according to the industrial scale for 65 000 t/y EAF dust treatment, shows an investment internal return rate of over 20 %.

Additional information

Authors: COLLETTA A, CSM, Rome (IT);BRASCUGLI, Acciai Speciali Terni, Terni (IT);BALLEWSKI H H, Krupp Thyssen Nirosta Bochum (DE);ARTIOLI A, ASO siderurgica, Ospitaletto (IT);BIANCHIFERRI M, Techint, Castellanza (IT)
Bibliographic Reference: EUR 20505 EN (2002), pp.76. Euro: 11.50
Availability: EUR-OP reference: KI-NA-20505-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-4491-6
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