Browse > Article

Characteristics of Carbidization for Iron Ore Fines with a Wide Size Range  

Hwang Ho-Sun (대원특수강(주) 기술연구소)
Chung Uoo-Chang (부산대학교 신뢰성연구센터)
Chung Won-Sub (부산대학교 재료공학부)
Chung Won-Bae (부산대학교 재료공학부)
Publication Information
Resources Recycling / v.12, no.5, 2003 , pp. 42-49 More about this Journal
Abstract
Characteristics of reduction and carbidization for hematite ore with a wide size range have been investigated at high temperature(590∼64$0^{\circ}C$) under $H_2$ and $H_2$-CO gas mixtures. The apparent activation energy for reduction of hematite ore with H2 gas was found to be 20 kJ/mol. The weight loss by reduction was about 28% md the weight gain by carbidization was about 5%. The measured values of weight change were compared with those calculated from equation (3) & (5) and fairly good agreement was obtained. The rate of carbidization was increased with an decrease in temperature, particle diameter and gas ratio($H_2$/ CO). The free carbon was increased with decrease in gas ratio($H_2$/ CO). The rate of carbidization was increased with mixing of $H_2$ gas but this effect was not proportional to fraction of $H_2$ gas. It was also found that the rate of carbidization was the maximum in the $H_2$ gas fraction of 0.5. It is considered that $H_2$ plays a part as a catalyst for formation of iron carbide($Fe_3$C).
Keywords
hematite; gas mixture; reduction; carbidization; free carbon;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Pollock. B. A., 1993: Iron Steelmaker 20, pp. 25-28
2 Garraway., 1996: Nucor's Startup of the World's First Commercial Iron Carbide Plant, Iron Steelmaker, 23, pp. 27-31
3 Steeling. O., 1985: J0M, 10, pp. 290-299
4 Gray, P. R., and Leroy. B. J., 1975: U.S.A Patent 3 885 023
5 Osdoit. B., 1960: Mem, Sc. Rev. Met., 57, pp. 194-199
6 Hayashi, S., and Iguchi. Y, 1997: Synthesis of Iron Carbide by Reaction of Iron Ores with $H_2$-C0 Gas Mixtures Bearing Traces of Sulfur, ISIJ Int., 37, pp. 16-20   DOI   ScienceOn
7 Kolesnik, N. F., and St. Pierre. G. R., 1980: Metall. Trans., 11B, pp. 28
8 Stephenson, R. L., and Smailer. R. M., 1980: Direct Reduction Iron Technology and Economics of Production and Use, Iron & Steel Society of AIME, USA, pp. 24
9 Geiger, G. H., and Stephens. F. A., 1993: Ironmaking Conf. Proc., pp. 333-340
10 Chung, U. C., Lee, I. O., Kim, H. G., Sahajwalla, V., and Chung. W. B., 1998: Degradation Characteristics of Iron ore Fines of a Wide Size Distribution in the Fluidized-bed Reduction, ISIJ Int. 38, pp. 943-952   DOI
11 Manning, M. P., and Reid. R. C., 1977: Ind. Eng. Chem. Process Des. Dev., 16, pp. 358   DOI   ScienceOn
12 Gradke, H. J., Muller-Lorenz, E. M., and Schneider. A., 2001: Carburization and Metal Dusting on Iron, ISIJ Int., 41, p. S1-S8   DOI   ScienceOn
13 Nakagawa, H., Murayama, T., and Ono. Y., 1996: Tetsu-tohagane 82, pp. 1-8   DOI
14 Linoy, K., Gotoh, K., and Higashitani. K., 1991: Power Technology Handbook, Marcel Dekker, New York, PP. 13
15 Hager, J. P., Stephens, F. A. and Stephens. F. M., 1994: Method for Controlling the Conversion of Iron-Containing Reactor Feed into Iron Carbide, U.S.A Patent 5 366 897, Nov. 22
16 Hayashi, S. and Iguchi. Y., 1998: Production of Iron Carbide from Iron Ores in a Fluidized Bed, ISIJ Int., 38, pp. 1053-1061   DOI   ScienceOn
17 Edstr$\"o$m. J. 0., 1953: J. Iron Steel Inst., pp. 289
18 Olmer. F, 1942: J. Phys. Chem., 46, pp. 405   DOI
19 Hayashi, S. and Iguchi. Y., 1997: Iron Carbide Synthesis by Reaction of Iron Ore with $H_2$-$CH_4$ GasMixtures Containing Traces of Sulfur, ISIJ Int., 37, pp. 345-349   DOI   ScienceOn
20 Turkogan. E. T., 1980: Physical Chemistry of High Temperature Technology, Academic Press, New York, pp. 412
21 Conejo, A. N., and Martins. G. R, 1997: Conversion of Hematite to Iron Carbides by Gas Phase Carbidization, ISIJ Int., 37, pp. 967-976   DOI   ScienceOn