ISSN 2594-357X
34º Seminário de Redução de Minério de Ferro e Matérias-Primas — Vol. 01 , num. 34 (2004)
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Abstract
During stainless steel production, in an Electric Arc Furnace, the dust generated is around 1% of the charge. This dust contains chromium, zinc and others heavy metals oxides and therefore its final disposition in special landfill is expensive. In the other hand the content of chromium oxide (~9%), nickel oxide (~2,5%) and iron oxides (~47%) can be recovered by reduction with carbon or Fe-Si. In this paper the dust were characterized physically and chemically; self-reducing pellets with carbon and Fe-Si were produced; and these pellets were placed on the high carbon melt at temperature around 1600°C. After smelting-reduction the recovery yields of Cr, Ni and Fe were determined. These yields were: a) with Fe-75%Si as reductant: (Ni ~90%, Cr ~90% e Fe ~90%); and b) with coal as reductant (Ni ~12%, Cr ~35% e Fe ~90%). A preliminary economic evaluation shows that the process is sustainable depending on the landfill cost for dusts and availability of Fe-Si fines at low price. When coal is used as reductant the electric energy cost become the main cost component and the above recycling process becomes economically feasible with landfill cost higher than US$ 150/t.
During stainless steel production, in an Electric Arc Furnace, the dust generated is around 1% of the charge. This dust contains chromium, zinc and others heavy metals oxides and therefore its final disposition in special landfill is expensive. In the other hand the content of chromium oxide (~9%), nickel oxide (~2,5%) and iron oxides (~47%) can be recovered by reduction with carbon or Fe-Si. In this paper the dust were characterized physically and chemically; self-reducing pellets with carbon and Fe-Si were produced; and these pellets were placed on the high carbon melt at temperature around 1600°C. After smelting-reduction the recovery yields of Cr, Ni and Fe were determined. These yields were: a) with Fe-75%Si as reductant: (Ni ~90%, Cr ~90% e Fe ~90%); and b) with coal as reductant (Ni ~12%, Cr ~35% e Fe ~90%). A preliminary economic evaluation shows that the process is sustainable depending on the landfill cost for dusts and availability of Fe-Si fines at low price. When coal is used as reductant the electric energy cost become the main cost component and the above recycling process becomes economically feasible with landfill cost higher than US$ 150/t.
Keywords
recycling, EAF stainless steel dust, self-reduction, chromium recovery, economic evaluation
recycling, EAF stainless steel dust, self-reduction, chromium recovery, economic evaluation
How to cite
Takano, Cyro; Cavallante, Ferdinando Luiz; Santos, Dener Martins dos; Mourão, Marcelo Breda.
RECOVERY OF Cr, Ni AND Fe FROM ELECTRIC ARC FURNACE DUST OF STAINLESS STEEL: AN ECONOMIC EVALUATION,
p. 653-662.
In: 34º Seminário de Redução de Minério de Ferro e Matérias-Primas,
None,
2004.
ISSN: 2594-357X, DOI 10.5151/2594-357x-34Red-653-662
