Effect of Using Oxygen-Enriched Gas during Induration Process of Iron Ore Pellets Containing Solid Fuel

Document Type: Research Paper

Author

Materials and Energy Research Center, P.O. Box 31787-316, Karaj, Tehran, Iran

Abstract

In this research, the effects of oxygen injection during the induration process were studied in order to improve the quality specifications and increase the rate of production of the iron oxide pellets. Several experiments were carried out in palletizing pilot plant in different conditions of oxygen injection. The results suggested that if only the extra oxygen was injected into the furnace in a specific range of time and temperature, shortening of the time of heating process and increasing the rate of production in the induration machine could be achievable. Furthermore, the optimal condition for oxygen injection into the combustion gas was determined for the pellets containing the coke powder. The microstructures of a cross section of the pellets were investigated via scanning electron microscopy. The results showed that oxygen injection into the furnace provided the condition for the production of a uniform homogenous structure without cracks and microstructure defects in iron ore pellet.

Keywords


[1] Q.D. Zhou and L.T. Kong: Theory and Process
of Iron Ore Agglomeration, Metallurgical Industry
Publisher, China, (1992).
[2] P.O. Pape, R.D. Frans and G.H. Geiger: Ironmaking
Steelmaking, 3(1976), 138.
[3] K. Meyer: Pelletizing of Iron Ores, Verlag
Stahleisen, Germany, (1995).
[4] L.A. Haas, J.C. Nigro and R.C. Moe: Oxygen
Enrichment in Iron Ore Pelletizing, Cleveland Cliffs
Inc. and U.S. Bureau of Mines, USA, (1990).
[5] S.P.E. Forsmo: Int. J. Miner. Process, 75(2005),
135.
[6] L.X. Yang and E. Matthews: ISIJ Int., 37(1997),
1057.
[7] L.X. Yang and C.E. Loo: ISIJ Int., 37(1997), 449.
[8] S.P.E. Forsmo, S.E. Forsmo, P.O. Samskog and
B.M.T. Bjorkman: Powder Tech., 183(2008), 247.