Improvement of Sinter Productivity by Dry Particles Addition (Development of RF-Mebios Process)

by Masaru Matsumura, Yasuhide Yamaguchi, Chikashi Kamijo, Takazo Kawaguchi Youichi Nakagawa, Masahide Yoshikawa, And Kazuharu Yamada

Publisher - – Sumitomo Metal Industries , Ltd, Kamisu Ibaraki

Category - General Novel

In order to increase the permeability of the sintering bed for sinter ore productivity, RF-MEBIOS(Return Fine - Mosaic Embedding Iron Ore Sintering) process, in which dry particles are added on granulated raw materials and then they are charged into sintering machine, is proposed. In RF-MEBIOS, it is demonstrated by pot tests that productivity increases at the same moisture content in sinter mixture at charging. This productivity increase is caused by higher permeability in sinter packed bed 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 sinter packed bed after charging. The former is achieved by a higher moisture content in the raw materials at granulation, which has the role of decreasing small size of pseudo-particle(-0.25mm). The latter is achieved by higher friction in the packed bed composed of dry and wet particles compound, which has a role of decreasing bulk density. In the development of RF-MEBIOS, return fine was 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 fine added after granulation stage. The effect of pseudo-particle(-0.25mm) ratio andεon flame front speed were evaluated as 55% and 41% to increase of frame front speed, respectively. RF-MEBIOS method is installed on three commercial sintering machines (Kashima, Wakayama, and Kokura) belonging Sumitomo Metals. In all three sinter plant, increasing productivity has been confirmed. Therefore, introducing RF-MEBIOS has been demonstrated to cause a universal improvement of sinter productivity

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