Title

IMPROVEMENT OF SINTER PRODUCTIVITY BY DRY PARTICLES ADDITION ON GRANULATED RAW MATERIALS (DEVELOPMENT OF RF-MEBIOS PROCESS)

IMPROVEMENT OF SINTER PRODUCTIVITY BY DRY PARTICLES ADDITION ON GRANULATED RAW MATERIALS (DEVELOPMENT OF RF-MEBIOS PROCESS)

Authorship

Yamaguchi, Yasuhide; Kamijo, Chikashi; Matsumura, Masaru; Kawaguchi, Takazo; Nakagawa, Youichi; Yoshikawa, Masahide; Yamada., Kazuharu

Yamaguchi, Yasuhide

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Kamijo, Chikashi

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Matsumura, Masaru

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Kawaguchi, Takazo

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Nakagawa, Youichi

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Yoshikawa, Masahide

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Yamada., Kazuharu

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DOI

10.5151/2594-357X-22196

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Abstract

In order to increase the permeability of the sintering bed for sinter ore productivity, the RF-Mebios (Return Fine - Mosaic Embedding Iron Ore Sintering) process, in which dry particles are added to granulated raw materials and then they are charged into a sintering machine, is proposed. In RF-Mebios, it is demonstrated by pot tests that sinter productivity increases at the same moisture content in sinter mixture at charging. This productivity increase is caused by higher permeability due to two major phenomena. One is by increasing the pseudo-particle size at granulation and the other is by decreasing the bulk density of the sinter packed bed after charging. The former is achieved by a higher moisture content in the raw materials at granulation. The latter is achieved by higher friction in the packed bed composed of dry and wet particle compounds. In the development of RF-Mebios, return fines were chosen as the dry particle because it is dry when produced by the sintering machine. The sinter productivity increases with the increase of the quantity of the return fines added after granulation. Moreover, RF-Mebios method is installed on three commercial sintering machines (Kashima, Wakayama, and Kokura) belonging to Sumitomo Metals. In all three sinter plants, increasing productivity has been confirmed. Therefore, introducing RF-Mebios has been demonstrated to cause a universal improvement of sinter productivity.

In order to increase the permeability of the sintering bed for sinter ore productivity, the RF-Mebios (Return Fine - Mosaic Embedding Iron Ore Sintering) process, in which dry particles are added to granulated raw materials and then they are charged into a sintering machine, is proposed. In RF-Mebios, it is demonstrated by pot tests that sinter productivity increases at the same moisture content in sinter mixture at charging. This productivity increase is caused by higher permeability due to two major phenomena. One is by increasing the pseudo-particle size at granulation and the other is by decreasing the bulk density of the sinter packed bed after charging. The former is achieved by a higher moisture content in the raw materials at granulation. The latter is achieved by higher friction in the packed bed composed of dry and wet particle compounds. In the development of RF-Mebios, return fines were chosen as the dry particle because it is dry when produced by the sintering machine. The sinter productivity increases with the increase of the quantity of the return fines added after granulation. Moreover, RF-Mebios method is installed on three commercial sintering machines (Kashima, Wakayama, and Kokura) belonging to Sumitomo Metals. In all three sinter plants, increasing productivity has been confirmed. Therefore, introducing RF-Mebios has been demonstrated to cause a universal improvement of sinter productivity.

Keywords

Sinter productivity; Granulation; Return fines; RF-Mebios.

Sinter productivity; Granulation; Return fines; RF-Mebios.