Title

BEHAVIOR OF IRON ORE SELF-REDUCING MIXTURES IN ROTARY KILN AT 1673 AND 1773K

BEHAVIOR OF IRON ORE SELF-REDUCING MIXTURES IN ROTARY KILN AT 1673 AND 1773K

Authorship

Nogueira, Alberto Eloy Anduze; Zambrano, Adolfo Pillihuaman; Takano, Cyro; Mourão, Marcelo Breda

Nogueira, Alberto Eloy Anduze

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Zambrano, Adolfo Pillihuaman

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Takano, Cyro

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Mourão, Marcelo Breda

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DOI

10.5151/5463-5463-0010

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Abstract

This work try to understand the behavior of self-reducing mixtures of iron ore when charged into a experimental rotary kiln, at temperatures between 1673 K (1400 °C) and 1773 K (1500°C). It was attempted to observe the possible technological obstacles and to study briefly the heat and mass transport involved. The kiln was fed with two types of charge, one at the form of pellets and one as mixture of fines. In all cases, including the mixtures with sawing dust, it was obtained iron carbon nuggets, of variable sizes. There was a tendency to form a kiln ring, but it was minimized by low wetability of the slag on the graphite tube and by the subsequent reduction reaction. The self-reducing mixture, with or without pelletizing, showed to be adequate to this type of particular furnace.

This work try to understand the behavior of self-reducing mixtures of iron ore when charged into a experimental rotary kiln, at temperatures between 1673 K (1400 °C) and 1773 K (1500°C). It was attempted to observe the possible technological obstacles and to study briefly the heat and mass transport involved. The kiln was fed with two types of charge, one at the form of pellets and one as mixture of fines. In all cases, including the mixtures with sawing dust, it was obtained iron carbon nuggets, of variable sizes. There was a tendency to form a kiln ring, but it was minimized by low wetability of the slag on the graphite tube and by the subsequent reduction reaction. The self-reducing mixture, with or without pelletizing, showed to be adequate to this type of particular furnace.

Keywords

Self-reducing; Rotary kilns; Iron-carbon nuggets.

Self-reducing; Rotary kilns; Iron-carbon nuggets.