Title

DEVELOPMENT OF LABORATORY TESTS TO EVALUATE THE REACTIVITY IN SPONGE IRON

DEVELOPMENT OF LABORATORY TESTS TO EVALUATE THE REACTIVITY IN SPONGE IRON

Authorship

Grazziutti, Atilio; Guido, Damián; Ajargo, Francisco; Oreggioni, Soledad; Baglivo, Oscar; Costoya., Daniel

Grazziutti, Atilio

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Guido, Damián

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Ajargo, Francisco

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Oreggioni, Soledad

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Baglivo, Oscar

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Costoya., Daniel

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DOI

10.5151/2594-357X-22181

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Abstract

Sponge iron (DRI) is the product obtained in the direct reduction process, which is used as feedstock for the steel production by electric arc furnaces (EAF). DRI quality is defined by several parameters; one of the most important is the metallization degree (ratio of metallic Fe and total Fe). This ratio must be preserved until its use, so it is very important to prevent reoxidation. Reoxidation is a highly exothermic reaction, which under certain conditions it could get out of control to result in a violent reoxidation which leads to waste the material stored. Reoxidation will depend on the reduction process conditions, the storage conditions of the DRI and the characteristics of the iron ore used for its production. The latter is the main inconvenient and in some cases it has been the reason to stop using certain mines. This paper describes the operating problems caused by the violent reoxidation of the DRI and a methodology: Reactivity test, tuned up in IAS, to assess the oxygen avidity of the DRI. The results of this test will allow to estimate beforehand the behavior of recently obtained DRI, with the aim of adopting operative practices to preserve the DRI quality.

Sponge iron (DRI) is the product obtained in the direct reduction process, which is used as feedstock for the steel production by electric arc furnaces (EAF). DRI quality is defined by several parameters; one of the most important is the metallization degree (ratio of metallic Fe and total Fe). This ratio must be preserved until its use, so it is very important to prevent reoxidation. Reoxidation is a highly exothermic reaction, which under certain conditions it could get out of control to result in a violent reoxidation which leads to waste the material stored. Reoxidation will depend on the reduction process conditions, the storage conditions of the DRI and the characteristics of the iron ore used for its production. The latter is the main inconvenient and in some cases it has been the reason to stop using certain mines. This paper describes the operating problems caused by the violent reoxidation of the DRI and a methodology: Reactivity test, tuned up in IAS, to assess the oxygen avidity of the DRI. The results of this test will allow to estimate beforehand the behavior of recently obtained DRI, with the aim of adopting operative practices to preserve the DRI quality.

Keywords

Reactivity; Direct reduction iron; Direct reduction; Midrex.

Reactivity; Direct reduction iron; Direct reduction; Midrex.