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Iron and steelmaking
ArticleName Analysis of melting technology in EAF steelmaking from pellets and HBI with high phosphorous content
ArticleAuthor A. I. Hassan, G. I. Kotelnikov, A. E. Semin, G. Megahed

National University of Science and Technology «MISiS» (Moscow, Russia):

Hassan A. I., Post-Graduate, the Chair «Metallurgy of Steel and Ferroalloys»,
Kotelnikov G. I., Cand. Eng., Ass. Prof., the Chair «Metallurgy of Steel and Ferroalloys»,
Semin A. E., Dr. Eng., Prof., the Chair «Metallurgy of Steel and Ferroalloys»,


EZZ Flat Steel (Cairo, Egypt):
Megahed G., Deputy General Durector on Technical Affairs,


Direct reduced iron (DRI) is produced in two primary product forms namely pellets and hot briquetted iron. These products are chemically equivalent but physically different, differ in size and density. Therefore, it can be expected that, the development of both melting processes and slag refi ning occurs by diff erently using of these materials either in buckets or continuous feeding in EAF. This improvement can influence the melting time, steel yield and the concentration of phosphorus in the molten steel before tapping. The objective of this research is to evaluate and develop the efficiency of steelmaking processes with using both the reduced pellets and hot briquetted iron (HBI) with high phosphorus content in the EAF charge. The experiments have been conducted at EZZ Flat Steel Company in Egypt, with annual production 1.2 mln. t of hot-rolled flat steel with thickness 1.0–12.0 mm. The analysis of melting technology in EAF concluded that, the using of reduced pellets in the continuous feeding stage, is preferable than using hot briquetted iron (HBI). It will decrease the final phosphorus content in the molten metal, decrease the power-on time of 10 - 20% and increase the yield of steel by 5-7%. It is also shown that, the direct reduced iron proportion up to 25% in buckets 1 and 2 does not increase both the power-on time and energy consumption. The proposed development of steelmaking technology in high-power EAF-220 with the melting of high phosphorous content direct reduced iron 0,061% P. It involved only using the pellets in continuous feeding charge about (27%) by weight of the total metallic charge, the hot briquetted iron (HBI) with (8%) as a part of the buckets charge. Heats samples which conducted for the proposed technology, showed that, the phosphorus content of the molten metal decreased from 0.0160–0.0082 to 0.0080–0.0047%, the specifi c energy consumption decreased from 519 to 485 kW· h/t, power on time decreased from 58–66 to 50–55 minutes, while the yield of steel increased by 5–7%.

keywords Metallic charge, technology, metallized raw materials, steelmaking, arc furnace

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