2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 1: D'Abreu Intl. Symp. / Iron and Steel Making
| Editors: | Kongoli F, Noldin JH, Takano C, Lins F, Gomez Marroquin MC, Contrucci M |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 320 pages |
| ISBN: | 978-1-987820-37-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
CD shopping page
Simultaneous Metallization and Carburization in Shaft Furnaces. From Experimentals to Modelling
Edelink Falero1; Jose Carlos D’Abreu1; Mauricio Otaviano2;1PUC-RIO, Rio de Janeiro, Brazil; 2SAMARCO MINING COMPANY, Ubu, Brazil;
Type of Paper: Regular
Id Paper: 99
Topic: 2
Abstract:
Currently the production and use of DRI are increasing in developed countries, mainly due to the reduced price of natural gas and the success of the new shale gas extraction technology. In addition, the lower level of DRI contaminants than in scraps, led the former to be considered a good alternative as a metallic burden for Electric Arc Furnace (EAF) and LD / BOF converters.
Operating costs and environmental problems are actually important technological factors to be considered in the optimization of DRI production. Therefore, the carbon content of DRI has become one of that, due to the ability to generate chemical energy in steel bath, thus complementing the electricity in EAFs, and the exothermic contributions of Si and C oxidation in the LD.
This work is part of a whole cooperation program between Samarco Mining Company and the Iron & Steelmaking Research Group of the Pontifical Catholic University of Rio de Janeiro / PUC-Rio, dealing with the kinetic equations for the simultaneous metallization and carburization in DR shaft furnaces. For this purpose, the reactor was divided into three internal zones: Reduction, Transition and Cooling zones. Additionally, were also considered three concentric regions: peripheral, media and center. Using the results for a specific RD pellet, gas mixtures used in the industrial plants and fluid dynamic similarities of the process, the metallization and carburization kinetic equations were established for each zone. A computational program-METCARB, fully based on those kinetic equations, was then conceived. Finally, the further validation was proceeded taking into account two industrial operational runs.
Keywords:
Blast; Ferrous; Furnace; Metallurgy; Modeling; Pellets; Steel; Technology;References:
[1] D'Abreu J.C., Kohler H.M., Rodrigues de Araujo D. “DRI Carburization in the Reduction Zone of a Shaft Furnace”. (Samarco's Technical Seminar III: The Global Experience, Vitoria, Brazil 2008), 5.[2] Szekely J., Tawil E.L. The reduction of hematite pellets with carbon monoxide- hydrogen mixtures. Metallurgical transactions B, (vol 7B, 1976), 490- 492.
[3] Szekely J, Choudhary M, Tawil E.L. On the reaction of solids with mixed gases, metallurgical transaction B, (vol 8B, 1975), 103.
[4] D'Abreu J.C., Vera, J. C., Kohler, H.M., Araujo, D.R.,Contribution on DRI carburization Kinetics in the Reduction Zone of a Shaft Furnace Midrex Type. In: 15th Conferencia de Acería - Conferencia de Reducción 5, 2005, San Nicolás, Argentina. 5th Ironmaking Conference. San Nicolás: Argentine Institute of Metallurgy, 2005. v1. P.39-46.
[5] Meraikib M, Friedrichs H.A. Steel Res., 58, (1987), 439-445.
[6] Motlagh M. Catalytic activity of carbono-free iron. (ISM, Feb 2000), 31-38.
[7] Turkdogan E.T, Vinters J.V. Catalytic effect of iron on decomposition of carbon monoxide. Part I. Metallurgical Transactions B, (vol 5, Jan 1974), 11-19.
[8] D’Abreu J.C, Rodrigues D.” Contribution on DRI carburization kinetics in the reduction zone of a shaft furnace”. (15th San Nicolás steelmaking Conference, San Nicolás, IAS, 2005, vol 1), 39-46.
[9] Towhidi N, Szekely J. The influence of carbon deposition on the reduction kinetics of commercial grade hematite pellets with CO, H2 and N2. Metallurgical Transactions B, (Vol. 14B, September 1983), 359-367.
[10] Mamani Paco L.J. “Cinética da redução de pelotas de minério de ferro em condições simuladas de um reator Midrex” (MSc. Abstract, Pontifícia Universidade Católica; October 2010), 62-65.
[11] Belisario F, D’Abreu J.C., Otaviano M.M., Kohler H.M. “ Simulação experimental da carburização de DRI em reator de cuba tipo Midrex”. (40th Seminar of Iron ore and Raw Material Reduction 11th Brazilian Symposium on Iron Ore, Belo Horizonte – MG, September 2010),8.
[12] D’Abreu J.C, Kohler H.M, Tinoco Falero E.E. “Simulação Experimental e Modelamento Computacional da Metalização e Carburização simultâneas em Reatores RD de Cuba”. Tese de Doutorado, Rio de Janeiro, Fevereiro 2016.
[13] D’Abreu J.C., Reduccion Directa: Fenomenologia y Cinética de Reduccion y de la Carburización de Hierro Esponja, Charla Magistral en 1st Peru-Brazil Symposium on Steelmaking and Treatment of Dust, Residues and Minerals, Oct, 29 to 31, 2014, Lima, Perú