2018 - Sustainable Industrial Processing Summit & Exhibition
4-7 November 2018, Rio Othon Palace, Rio De Janeiro, Brazil
| Metallization and Carburization Kinetic in DR Shaft Furnaces Edelink Efrain Tinoco Falero1; Mauricio Otaviano2; Jose Carlos D Abreu1; 1PUC-RIO, Rio de Janeiro, Brazil; 2SAMARCO MINING COMPANY, Ubu, Brazil; PAPER: 135/Iron/Plenary (Oral) SCHEDULED: 17:40/Mon./Mar Azul (50/1st) ABSTRACT: Presently, the production and consumption of DRI are continuously increasing, as a consequence of a specific condition of the NG market, generated for the economic impact assigned to the shale gas extraction technology. Considering this context, DRI can thus effectively improve the BF, EAF and LD converters' productivity and, consequently their competitiveness. In this work, the results of a cooperative research between PUC-Rio University and a Brazilian mining company are presented. Laboratory-scale simulation tests, using RD commercial pellets and typical industrial operational parameters of a bench market RD shaft furnace, were conducted and planned using statistical and factorial analysis. In the simulated experiments, the following three regions of the DR shaft furnace were considered: Reduction, Transition, and Cooling zones. Basically, three stages were considered in the research development: step one, which analyzed the reactions and equations concerning pellet metallization and carbon precipitation; step two, where the experiments focused essentially on the definition of the carburization kinetic equations occurring in the Transition and Cooling zones; and finally step three, which aimed to develop the "METCARB" computational program, conceived to mathematically simulate the metallization and carbon reactions along the height of the furnace. At last, an industrial case was presented in order to compare to the "METCARB" outputs. References: [1] 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. [2] 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. [3] D'Abreu J.C., Vera, J. C., Kohler, H.M., Araujo, Contribution on DRI carburization Kinetics in the Reduction Zone of a Shaft Furnace Midrex Type. In: 15th Conferencia de Acería - Conferencia de Reducción, San Nicolás, Argentina. 5th Ironmaking Conference. San Nicolás: Argentine Institute of Metallurgy, 2005. v1. P.39-46. [4] 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). [5] 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. [6] 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. [7] Szekely J., Tawil E.L. The reduction of hematite pellets with carbon monoxide- hydrogen mixtures. Metallurgical transactions B, (vol 7B, 1976), 490- 492. [8] Szekely J, Choudhary M, Tawil E.L. On the reaction of solids with mixed gases, metallurgical transaction B, (vol 8B, 1975), 103. [9] D'Abreu J.C, Kohler H.M, Tinoco Falero E.E. "Simulaceo Experimental e Modelamento Computacional da Metalização e Carburização simultâneas em Reatores RD de Cuba". Tese de Doutorado, Rio de Janeiro, Fevereiro 2016. [10] D'Abreu J.C, Kolher H.M, Falero E.T, Otaviano M.M. (2015) on the simultaneous Iron Oxide Reduction and Carburization Kinetics, paper presented at the 144th TMS Annual Meeting, Orlando, Florida, 15- 19 March 2015 [11] D'Abreu J.C, Kolher H.M, Falero E.T, Otaviano M.M. (2015) Simultaneous metallization and DRI carburization kinetics in DR shaft furnaces, paper presented at the 7th International Conference on the Science and Technology of Ironmaking, ICSTI 2015, Cleveland Convention Center Cleveland; United States, 4- 7 May 2015 |
