Title

MATERIALS EVALUATION FOR DECREASING PELLETS CLUSTERING TENDENCY IN REDUCTION DIRECT PROCESS

MATERIALS EVALUATION FOR DECREASING PELLETS CLUSTERING TENDENCY IN REDUCTION DIRECT PROCESS

Authorship

Pereira, José Geraldo; Castro, Luiz Fernando Andrade de; Bailon, Ana Maria Guilherme; Meschiatti, Alaecio; Simões, Heidy de Oliveira; Turrer, Henrique Dias Gatti; Doellinger., Thiago Marchezi

Pereira, José Geraldo

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Castro, Luiz Fernando Andrade de

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Bailon, Ana Maria Guilherme

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Meschiatti, Alaecio

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Simões, Heidy de Oliveira

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Turrer, Henrique Dias Gatti

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Doellinger., Thiago Marchezi

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DOI

10.5151/2594-357X-22427

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Abstract

The process for obtaining metallic iron by direct reduction of iron ore is very important for the iron making and its technology has developed significantly in recent decades. The formation of clusters by sticking the pellet during reduction is considered a substantial obstacle to this evolution, which decreases the permeability of gases through the burden, thus affecting the reactor performance. Several studies have addressed the issue and are complementary in describing the sticking phenomenon. This paper evaluated the use of different materials for decreasing the tendency of pellets sticking together during reduction. Pellets were submitted to laboratorial tests that comprises sprayed them with a suspension of selected materials and water, followed by reducing them in a direct reduction reactor, according to the 11256 ISO standard. Mostly of the selected materials were MgO sources, as dunite, serpentinite, dolomite, magnesite, talc and olivine. Other ones were limestone, bentonite and itabirite concentration tailings. MgO sources showed better figures, mainly serpentinite and olivine. Dolomite and talc has a good potential for replacing limestone.

The process for obtaining metallic iron by direct reduction of iron ore is very important for the iron making and its technology has developed significantly in recent decades. The formation of clusters by sticking the pellet during reduction is considered a substantial obstacle to this evolution, which decreases the permeability of gases through the burden, thus affecting the reactor performance. Several studies have addressed the issue and are complementary in describing the sticking phenomenon. This paper evaluated the use of different materials for decreasing the tendency of pellets sticking together during reduction. Pellets were submitted to laboratorial tests that comprises sprayed them with a suspension of selected materials and water, followed by reducing them in a direct reduction reactor, according to the 11256 ISO standard. Mostly of the selected materials were MgO sources, as dunite, serpentinite, dolomite, magnesite, talc and olivine. Other ones were limestone, bentonite and itabirite concentration tailings. MgO sources showed better figures, mainly serpentinite and olivine. Dolomite and talc has a good potential for replacing limestone.

Keywords

Clustering index; Coating; Pellets; Direct reduction.

Clustering index; Coating; Pellets; Direct reduction.