Abstract
Iron nugget and boron-rich slag can be obtained in a short time through high-temperature reduction of boronbearing iron concentrate by carbonaceous material, both of which are agglomerated together as a carbon composite pellet. This is a novel flow sheet for the comprehensive utilization of boron-bearing iron concentrate to produce a new kind of man-made boron ore. The effect of reducing agent species (i.e., carbon species) on the reduction and melting process of the composite pellet was investigated at a laboratory scale in the present work. The results show that, the reduction rate of the composite pellet increases from bituminite, anthracite, to coke at temperatures ranging from 950 to 1300°C. Reduction temperature has an important effect on the microstructure of reduced pellets. Carbon species also affects the behavior of reduced metallic iron particles. The anthracite-bearing composite pellet melts faster than the bituminitebearing composite pellet, and the coke-bearing composite pellet cannot melt due to the high fusion point of coke ash. With anthracite as the reducing agent, the recovery rates of iron and boron are 96.5% and 95.7%, respectively. This work can help us get a further understanding of the new process mechanism.
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References
Y. Quan, Research and Development of Boron and Boron Compounds, Dalian University of Technology Press, Dalian, 2008, p. 1.
X.P. Zhang, J.F. Lang, and C.M. Cui, Comprehensive utilization of low grade ludwigite ore with blast furnace smelting, Iron Steel, 30(1995), No. 12, p. 9.
L. Lehtinen, J. Hansen, and N. Rokop, Iron dynamics process: a new way to make iron, AISE Steel Technol., 76(1999), No. 12, p. 37.
O. Tsuge, S. Kikuchi, K. Tokuda, S. Ito, I. Kobayashi, and A. Uragami, Successful iron nuggets production at ITmk3 pilot plant, [in] Proceedings of the 61st Ironmaking Conference, Nashville, 2002, p. 511.
T. Matsumura, Y. Takenaka, and M. Shimizu, Effect of the carbon content on reduction and melting behavior of carbon composite iron ore pellet, Tetsu-to-Hagane, 85(1999), No. 9, p. 652.
K. Nagata, R. Kojima, T. Murakami, M. Susa, and H. Fukuyama, Mechanisms of pig-iron making from magnetite ore pellets containing coal at low temperature, ISIJ Int., 41(2001), No. 11, p. 1316.
G. Wang, J.S. Wang, Y.G. Ding, S. Ma, and Q.G. Xue, New separation method of boron and iron from ludwigite based on carbon bearing pellet reduction and melting technology, ISIJ Int., 52(2012), No. 1, p. 45.
T. Murakami and K. Nagata, New ironmaking process from the viewpoint of carburization and iron melting at low temperature, Miner. Process. Extr. Metall. Rev., 24(2003), No. 3–4, p. 253.
J. Yang, T. Mori, and M. Kuwabara, Mechanism of carbothermic reduction of hematite in hematite-carbon composite pellets, ISIJ Int., 47(2007), No. 10, p. 1394.
T. Matsui, N. Ishiwata, Y. Hara, and K. Takeda, Influence of gangue composition on melting behavior of coal-reduced iron mixture, ISIJ Int., 44(2004), No. 12, p. 2105.
K. Satoh, T. Noguchi, and M. Hino, Reduction and carburization of iron oxide by carbonaceous materials, Steel Res. Int., 81(2010), No. 10, p. 834.
H.S. Kim, J.G. Kim, and Y. Sasaki, The role of molten slag in iron melting process for the direct contact carburization: wetting and separation, ISIJ Int., 50(2010), No. 8, p. 1099.
H.S. Kim, Y.B. Kang, J.G. Kim, and Y. Sasaki, The role of iron oxide bearing molten slag in iron melting process for the direct contact carburization, ISIJ Int., 51(2011), No. 1, p. 166.
Y. Iguchi and S. Endo, Carburized carbon content of reduced iron and direct carburization in carbon composite iron ore pellets heated at elevated temperature, ISIJ Int., 44(2004), No. 12, p. 1991.
X.M. Huang, K. Asano, T. Fujisawa, Z.T. Sui, and C. Yamauchi, Thermodynamic properties of the MgO-BO1.5-SiO2 system at 1723 K, ISIJ Int., 36(1996), No. 11, p. 1360.
J.N. Shao and W.P. Tao, Mineral Resources Industrial Requirements Manual, Geology Publishing House, Beijing, 2010, p. 372.
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Wang, G., Ding, Yg., Wang, Js. et al. Effect of carbon species on the reduction and melting behavior of boron-bearing iron concentrate/carbon composite pellets. Int J Miner Metall Mater 20, 522–528 (2013). https://doi.org/10.1007/s12613-013-0760-1
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DOI: https://doi.org/10.1007/s12613-013-0760-1