Title

MICROSTRUCTURAL CHARACTERIZATION OF SINTERS MADE UP WITH ALTERNATIVE RAW MATERIALS

MICROSTRUCTURAL CHARACTERIZATION OF SINTERS MADE UP WITH ALTERNATIVE RAW MATERIALS

Authorship

SANTOS, LUANA DUARTE; BRANDÃO, PAULO ROBERTO GOMES; PEREIRA, HÉLIO CARDOSO

SANTOS, LUANA DUARTE

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BRANDÃO, PAULO ROBERTO GOMES

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PEREIRA, HÉLIO CARDOSO

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DOI

10.5151/2594-357x-34Red-339-348

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Abstract

The most of Brazilian industrial iron ore sinter is produced using a mix composed by several ores. Nowadays, alternative materials are under trial to replace part of the ores, always seeking to obtain a better performance of the sintering mix in the process and a sinter that had a good performance in the blast furnace. In this work, characterization studies were carried out on sinters and modified products, aiming to evaluate the possible changes in the mineralogy and microstructure caused by the addition of different products in a reference mix. In the sintered materials, hematite occurs as a relic phase, but it can be partially or completely rearranged, with its original morphology modified. Magnetite and hematite show assimilation of Al, Ca, Si and Mg in their composition. Magnetite occurs associated with CFSA and forms intergrowths with hematite. Magnetite can be replaced by the CFSA, which modifies its morphology. The CFSA occurs as massive, acicular and columnar types. Silicates cores surrounded by aggregates of magnetite are observed. Pores of different forms and fissures are present. Increasing amounts of magnetite and secondary hematite showing mainly corroded and coalescent grains are observed.

The most of Brazilian industrial iron ore sinter is produced using a mix composed by several ores. Nowadays, alternative materials are under trial to replace part of the ores, always seeking to obtain a better performance of the sintering mix in the process and a sinter that had a good performance in the blast furnace. In this work, characterization studies were carried out on sinters and modified products, aiming to evaluate the possible changes in the mineralogy and microstructure caused by the addition of different products in a reference mix. In the sintered materials, hematite occurs as a relic phase, but it can be partially or completely rearranged, with its original morphology modified. Magnetite and hematite show assimilation of Al, Ca, Si and Mg in their composition. Magnetite occurs associated with CFSA and forms intergrowths with hematite. Magnetite can be replaced by the CFSA, which modifies its morphology. The CFSA occurs as massive, acicular and columnar types. Silicates cores surrounded by aggregates of magnetite are observed. Pores of different forms and fissures are present. Increasing amounts of magnetite and secondary hematite showing mainly corroded and coalescent grains are observed.

Keywords

iron ore sinter, microstructure, alternative materials, mineralogy, magnetite

iron ore sinter, microstructure, alternative materials, mineralogy, magnetite