EAF and secondary dust characterisation

Abstract The basic knowledge of the physical and chemical properties of the electric arc furnace (EAF) and secondary dust (SD) obtained by the characterisation provides important information on the potential problems that could be encountered during the processing of such materials. EAF dust consists mainly of very fine spherical particles. The most common phases in the EAF dust are solid solution of iron spinels generally enclosed into a matrix of calcium–iron silicate glass. Leaching tests show that as the Zn/Fe ratio increases, there is an increase in the zinc extraction, whereas the iron extraction decreases as the Zn/Fe ratio increases. It was possible to produce a SD containing 55.8% zinc by means of charging EAF primary dust–coal composite pellets into an induction furnace. SD consists of very fine particles presenting a mean particle size of 0.26μm. In addition, SD contains significant levels of iron, chloride and fluoride. The iron content in the SD was identified as being iron droplets ejected from the bath caused by high intensity gas generation during the smelting of the EAF primary dust–coal composite pellets.

[1]  J. R. Donald,et al.  A Kinetic study of the reaction of zinc oxide with iron powder , 1996 .

[2]  E. Nenniger,et al.  A hydrometallurgical process to treat carbon steel electric arc furnace dust , 1992 .

[3]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[4]  R. L. Nyirenda,et al.  The processing of steelmaking flue-dust: A review , 1991 .

[5]  Lotta Nedar.  Dust formation in a BOF converter , 1996 .

[6]  Larry M. Southwick.  The regulatory encouragement of metals recycling—Vete a Otro Perro Con Ese Hueso , 1998 .

[7]  M. Tsai,et al.  Mechanism of Spinel Ferrite Dust Formation in Electric Arc Furnace Steelmaking. , 1993 .

[8]  D. D. Juan,et al.  Tratamiento metalúrgico de los óxidos Waelz mediante lixiviación alcalina utilizando carbonato amónico , 1997 .

[9]  M. Olper,et al.  EZINEX, le procédé électrolytique de valorisation des poussières d’aciéries électriques , 1998 .

[10]  D. Neuschütz,et al.  Mechanisms of dust generation in a stainless steelmaking converter , 1993 .

[11]  R. Singh,et al.  Review of hydrometallurgical recovery of zinc from industrial wastes , 2001 .

[12]  O. Leclerc,et al.  Traitement des poussières d'aciéries électriques par le procédé REZEDA , 1997 .

[13]  G. Ye,et al.  Fine-particle characterization — An important recycling tool , 2002 .

[14]  D. Dreisinger,et al.  The hydrometallurgical treatment of carbon steel electric arc furnace dusts by the UBC-Chaparral process , 1990 .

[15]  Bo Björkman,et al.  Waste reduction through process optimization and development , 1996 .