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

Hassan A. I., Post-Graduate, the Chair «Metallurgy of Steel and Ferroalloys», discover3030@gmail.com
Kotelnikov G. I., Cand. Eng., Ass. Prof., the Chair «Metallurgy of Steel and Ferroalloys», gikotelnikov@yandex.ru
Semin A. E., Dr. Eng., Prof., the Chair «Metallurgy of Steel and Ferroalloys», asemin2007@yandex.ru

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

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%.

1. John Stubbles. Operating and Environmental Benefi ts From the Production and Use of Hot Briquetted Iron. The Iron & Steel Technology Conference and Exposition. Cleveland, Ohio : AISTech, February 2007. pp. 34–42.
2. Sponge iron, direct reduced iron (DRI), hot briquetеed iron (HBI), cold briquetеed iron (CBI) for steel making in induction furnace. Doc:MTD 30(5066). ICS 73.060.10. September 15, 2011. Bureau of Indian standards.
3. Vaish A. K., Singh S. D., Gufta K. N. Potentialities of alternative Charge materials for the electric arc furnace, National Metallurgical Laboratory. Jamshedpur-831007. pp. 97–105.
4. Timofeev E. S., Golovko E. V., Timofeeva A. S. Vliyanie goryachebriketirovannogo zheleza na kachestvo stali (Infl uence of hot-briquetted iron on steel quality). Sovremennye naukoemkie tekhnologii = Modern High Technologies. 2005. No. 1. pp. 29.
5. Lee M., Trotter D., Mazzei O. The production of low phosphorus and nitrogen steels in an EAF using HBI. Scandinavian Journal of Metallurgy. 2001. Vol. 30. pp. 286–291.
6. Hassan A. I., Kotelnikov G. I., Semin A. E., Megakhed G. M. Analiz protsessa defosforatsii pri vyplavke stali iz metallizovannogo syrya s povyshennym soderzhaniem fosfora (Analysis of dephosphorization process during steel smelting from metallized raw materials with increased phosphorous content). Chernye Metally = Ferrous metals. 2015. No. 1. pp. 12–18.
7. Trakhimovich V. I., Shalimov A. G. Ispolzovanie zheleza pryamogo vosstanovleniya pri vyplavke stali (Use of DRI during steel smelting). Moscow : Metallurgiya, 1982. 248 p.
8. Pavlov V. V., Logunova O. S. Charge Melting Materials Selection Procedure for EAF to Work in Power Saving Mode. World Applied Sciences Journal. 2014. No. 31 (8). pp. 1502–1507.
9. Timofeev E. S. Sovershenstvovanie energotekhnologicheskogo rezhima vyplavki stali v DSP-150 pri ispolzovanii goryachebriketirovannogo zheleza v zavalke s tselyu povysheniya eff ektivnosti proizvodstva. Avtoreferat dissertatsii (Improvement of energy-technological mode of steel smelting in the EAF-150 using hot-briquetted iron in charging for the purpose of increasing of production efficiency. Thesis of inauguration of Dissertation). 2007.
10. Anderson S. H. Educated use of DRI/HBI improves energy efficiency, yield and downstream ope rating results. Charlotte, North Carolina, USA : Midrex Technologies Inc., 3RD Quarter 2002. pp. 1–14.
11. Gregory L. Dressel. Direct reduced iron process effects and applications. Use of DRI in EAF. Pawleys Island, SC, USA, 1997. pp. 1–6.
12. Nabil Daoud Takla. Utilization of sponge iron in electric arc furnace. Qatar Steel Company Ltd. (QASCO), AISU 2nd Electric Furnace Symposium in Damascus, Syria, October 18-20, 1998. pp. 3–6.
13. Gudim Yu. A., Zinurov I. Yu., Kiseev A. D. Proizvodstvo stali v dugovykh pechakh. Konstruktsii, tekhnologiya, materialy (Steel making in arc furnaces. Design, technology, materials). Novosibirsk : Publishing House of Novosibirsk State Technical University, 2010. 547 p.