International Journal of Scientific & Technology Research

IJSTR@Facebook IJSTR@Twitter IJSTR@Linkedin
Home About Us Scope Editorial Board Blog/Latest News Contact Us

IJSTR >> Volume 4 - Issue 3, March 2015 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Effect Of LLDPE Addition On The Reduction Of Feo From EAF Slags

[Full Text]



James Ransford Dankwah, Emmanuel Baawuah



Index Terms: Linear low density polyethylene,Metallurgical coke; FeO reduction; Composite pellets, Infrared gas analyser, LECO carbon/sulphur analyser, LECO oxygen/nitrogen analyser, Extent of reduction,Carburisation; Desulphurisation.



Abstract: The effect of waste linear low density propylene (LLDPE) addition on the reduction of FeO-containing slag by metallurgical coke has been investigated through experiments conducted in a laboratory scale horizontal tube furnace. Composite pellets of EAF slag (47.1% FeO) with coke, LLDPE and blends of coke/LLDPE (in four different proportions) were rapidly heated at 1520 °C under high purity argon gas and the off gas was continuously analysed for CO and CO2 using an online infrared gas analyser (IR). The extent of reduction after ten minutes, level of carburisation and desulphurization were determined for each carbonaceous reductant. The results show significant improvements in extent of reduction along with improved levels of carburisation and desulphurisation of the reduced metal when coke was blended with LLDPE.



[1] PACIA 2012,“National Plastics Recycling Survey for July 2011- June 2012”, Technical Report R02-05-A10802, (1-62), 2012

[2] K.Nishioka, T.Taniguchi, Y. Ueki, K.Ohno, T.Maeda, and M.Shimizu, “Gasification and reduction behavior of plastics and iron mixtures by microwave heating”,ISIJ Int., 47(4), pp. 602-607, 2007

[3] J.R. Dankwah, “Utilisation of end-of-life plastics/rubber tyres and their blends with metallurgical coke in EAF steelmaking: reduction of iron oxide”, PhD. Thesis, School of Materials Science and Engineering, University of New South Wales, Sydney, Australia, 2012

[4] J.R. Dankwah, P. Koshy, N.M. Saha-Chaudhury, P. O’Kane, C. Skidmore, D. Knights, and V. Sahajwalla, “Reduction of FeO in EAF steelmaking slag by metallurgical coke and waste plastics blends”, ISIJ Int., vol. 51(3), pp. 498-507, 2011

[5] J.R. Dankwah, P. Koshy, P. O’Kane, and V. Sahajwalla, “Reduction of FeO in EAF steelmaking slag by metallurgical coke and end-of-life rubber tyre”,Steel Res. Int., vol. 83(8), pp. 766-774, 2012

[6] M. Rahman, “Fundamental reactions of slag/carbon interactions in electric arc furnace steelmaking process”, PhD. Thesis, UNSW-Sydney, Australia, 2010

[7] M. Zaharia, V. Sahajwalla, R. Khanna, P. Koshy and P. O’Kane, “Carbon/slag interactions between coke/rubber blends and EAF slag at 1550 degrees C”,ISIJ Int., vol. 49, pp. 1513-1521,2009

[8] Y. Ueki, R. Mii, K. Ohno, T. Maeda, K. Nishioka, and M. Shimizu, “Reaction behavior during heating waste plastic materials and iron oxide composites,ISIJ Int., vol. 48, pp. 1670-1675, 2008

[9] O. Kubaschewski, C.B. Alcock, and P.J. Spencer, Materials Thermochemistry, 6th Ed., Pergamon Press, Oxford, (1993), 257.

[10] A.A. El-Geassy and V. Rajakumar, “Gaseous reduction of wustite with H2, CO and H2-CO mixtures”, Trans. ISIJ,vol. 25, pp. 449-458, 1985

[11] H. Ono-Nakazato, T. Yonezawa and T. Usui,“Effect of water-gas shift reaction on reduction of iron oxide powder packed bed with H2-CO mixtures”, ISIJ Int., vol. 43, pp. 1502-1511, 2003

[12] E. Donskoi, D.L.S. McElwain, and L.J. Wibberley, “Estimation and modelling of parameters for direct reduction in iron ore/coal composites: Part II: Kinetic parameters”,Met. Mater. Trans. B, vol. 34B (2003), 255-266

[13] J.Y. Shi, E. Donskoi, D.L.S. McElwain, and L.J. Wibberley, “Modelling novel coal based direct reduction process”,Ironmaking and Steelmaking,vol. 35, pp. 3-132008

[14] S.Kongkarat, R.Khanna, P.Koshy, P.O’Kane, and V. Sahajwalla, “Use of waste bakelite as a raw material resource for recarburization in steelmaking processes”,Steel Research International, vol. 82 no. 10, pp. 1228-1239, 2011

[15] E.T. Turkdogan and J.V. Vinters, “Gaseous reduction of iron oxides. 3.Reduction-oxidation of porous and dense iron oxides and iron”, Metall. Trans., vol. 3,no. 6, pp. 1561-1574 , 1972

[16] R.J. Fruehan,“The rate of carburization of iron in CO-H2 atmospheres: Part I. The effect of temperature and CO and H2-pressures”, Metall. Trans., vol. 4,issue 9, pp. 2123-2127, 1973

[17] R.J. Fruehan,“The rate of carburization of iron in CO-H2 atmospheres: Part II. The effect of H2O and H2S on the rate of carburization of iron in CO-H2 atmospheres”, Metall. Trans., vol. 4, issue 9, pp. 2129-2132, 1973

[18] J.H. Kaspersma and R.H. Shay, “A model for carbon transfer in gas-phase carburization of steel”,J. Heat Treating, vol. 1, issue 4, pp. 21-28, 1980

[19] O. Karabelchtchikova, “Fundamentals of mass transfer in gas carburizing”, PhD. Thesis, Worcester Polytechnic Institute, New England, USA, 1997

[20] S. Kongkarat, R. Khanna, V. Sahajwalla, Interactions of polymer/coke blends with molten steel at 1823 K”,Steel Res. Int., vol. 84, issue 4, pp. 362-369, 2013

[21] S. Kongkarat. “Recycling of waste polymers in electric arc furnace steelmaking: slag/carbon and steel/carbon interactions”,PhD Thesis, UNSW-Sydney, Australia, (2011)

[22] T. Matsuda, M. Hasegawa, A. Ikemura, K. Wakimoto, and M. Iwase, “Utilization of waste plastic for production of metallic iron, hydrogen and carbon monoxide without generating carbon dioxide” ISIJ Int., vol. 48, pp. 1188-1196, 2008