Proceedings of the Ironmaking, Iron Ore and Agglomeration Seminars


ISSN 2594-357X

Title

REDUCTION BEHAVIOR OF CHROMITE CARBON COMPOSITE PELLETS, AT TEMPERATURE OF 1873K

REDUCTION BEHAVIOR OF CHROMITE CARBON COMPOSITE PELLETS, AT TEMPERATURE OF 1873K

DOI

10.5151/2594-357x-0069

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Abstract

Pre-reduced ferrochromium with high recovery yield of chromium is expected to decrease the overall energy consumption for ferrochromium production. The advantages of pre-reduced in comparison with lump ore in charging electric furnace for ferro-chromium production are: i) low consumption of electric energy; ii) use of fines of chromite and reductant; iii) better operational control of the electric furnace. The self-reducing pellets containing Brazilian chromite (Jacurici concentrate), petroleum coke and 2% Fe-75%Si, were agglomerated with Portland cement. For each experiment ~200g of pellets was used and they were placed at reduction zone (1773K) in a laboratory rotary kiln furnace. Experiments with 5, 10 and 30 minutes were made. The reduced pellets were analyzed by scanning electronic microscopy and it was observed: practically complete reductions of Cr and Fe; formation of a continuous slag phase at 30 minutes; a pre-reduced with compression strength of 130 kgf and without re-oxidation. The results have shown a great potential for use of this self-reducing process for high carbon ferro-chromium production.

 

Pre-reduced ferrochromium with high recovery yield of chromium is expected to decrease the overall energy consumption for ferrochromium production. The advantages of pre-reduced in comparison with lump ore in charging electric furnace for ferro-chromium production are: i) low consumption of electric energy; ii) use of fines of chromite and reductant; iii) better operational control of the electric furnace. The self-reducing pellets containing Brazilian chromite (Jacurici concentrate), petroleum coke and 2% Fe-75%Si, were agglomerated with Portland cement. For each experiment ~200g of pellets was used and they were placed at reduction zone (1773K) in a laboratory rotary kiln furnace. Experiments with 5, 10 and 30 minutes were made. The reduced pellets were analyzed by scanning electronic microscopy and it was observed: practically complete reductions of Cr and Fe; formation of a continuous slag phase at 30 minutes; a pre-reduced with compression strength of 130 kgf and without re-oxidation. The results have shown a great potential for use of this self-reducing process for high carbon ferro-chromium production.

Keywords

Chromite; Self-reducing agglomerate; Ferrochromium.

Chromite; Self-reducing agglomerate; Ferrochromium.

How to refer

Zambrano, Adolfo Pillihuaman; Takano, Cyro; Nogueira, Alberto Eloy Anduze; Ribeiro, Tiago Ramos; Mourão, Marcelo Breda. REDUCTION BEHAVIOR OF CHROMITE CARBON COMPOSITE PELLETS, AT TEMPERATURE OF 1873K , p. 667-677. In: 38º Seminário de Redução de Minério de Ferro e Matérias-primas e 9º Simpósio Brasileiro de Minério de Ferro, São Luís - MA, 2008.
ISSN: 2594-357X , DOI 10.5151/2594-357x-0069