2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 6: Yagi Intl. Symp. / Metals & Alloys Processing
| Editors: | Kongoli F, Akiyama T, Nogami H, Saito K, Fujibayashi A |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 480 pages |
| ISBN: | 978-1-987820-46-1 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Effect of MgO on Re-crystallization of Fe2O3 in Pellets
Gao Qiangjian1; Wei Guo1; Fengman Shen2; Zheng Haiyan3; Shen Fengman1;1SCHOOL OF METALLURGY, NORTHEASTERN UNIVERSITY, Shenyang, China; 2, Shenyang, China; 3SCHOOL OF METALLURGY, Shenyang, China;
Type of Paper: Regular
Id Paper: 30
Topic: 3
Abstract:
Induration process of oxidized pellets involves the oxidation of Fe3O4 and re-crystallization of Fe2O3. It is acknowledged that the re-crystallization of Fe2O3 in pellets is significant for pellets to obtain better ambient strength. In present work, the effect of MgO on the re-crystallization of Fe2O3 was studied. The results demonstrated that, as the mass fraction of MgO in pellets increased from 0% to 2.0%, the Fe2O3 crystallites would decrease gradually and distribute unevenly in pellets. Moreover, the crystallite connection of Fe2O3 would get weaker. In addition, MF-{(Fex Mg1-x) O • Fe2O3} phase would be generated in pellets. According to the quantitative analysis, with an addition of MgO content in pellets mentioned above, the volume-percentage of hematite decreased from 85.52% to 73.34%, and the magnetite and MF phase increased from 5.27% to 16.33%. Therefore, MgO plays a negative role in re-crystallization of Fe2O3. And the macro-performance of that was the compression strength (CS) of pellets which would be lower after the addition of MgO in pellets.
Keywords:
MgO; Pellets; Induration process; Fe2O3; Re-crystallizaitonReferences:
[1] Q.J. Gao, F.M. Shen, G. Wei, X. Jiang, H.Y. Zheng. Gas-solid reduction kinetic model of MgO-fluxed pellets. International Journal of Minerals, Metallurgy, and Materials, 2014, 21(1): 12-17.[2] F.M. Shen, Q.J. Gao, G. Wei, X. Jiang, Y.S. Shen. Densification Process of MgO Bearing Pellets. Steel Research International, 2015, 86(6): 644-650.
[3] Q.J. Gao, F.M. Shen, G. Wei, X. Jiang, H.Y. Zheng. Effects of MgO containing additive on low-temperature metallurgical properties of oxidized pellet. Journal of Iron and Steel Research International, 2013, 20(7): 25-28.
[4] T. Nishimura, K. Higuchi, M. Naito, K. Kunitomo, Evaluation of softening, shrinking and melting reduction behavior of raw materials for blast furnace. ISIJ International. 2011, 51(8): 1316-1322.
[5] M. Iljana, O. Mattila, T. Alatarvas, J. Kurikkala, T. Paananen, T. Fabritius, Effect of circulating elements on the dynamic reduction swelling behaviour of olivine and acid iron ore pellets under simulated blast furnace shaft conditions. ISIJ International, 2013, 53(3): 419-426.
[6] T.J. Chun, D.Q. Zhu, J. Pan, Influence of sulfur content in raw materials on oxidized pellets. Journal of Central South University of Technology, 2011, 18(6): 1924-1929.
[7] S.H. Li, T.J. Chen, Y.M. Zhang, J. Zhao. Experimental study on application of Mg -bearing additives in iron ore pellet. Sintering Pelletizing, 2011,36(1): 33-37.
[8] Q.J. Gao, G. Wei, X. Jiang, H.Y. Zheng, F.M. Shen. Characteristics of Calcined Magnesite and Its Application on Oxidized Pellet Production. Journal of Iron and Steel Research International, 2014, 21(4): 408-412.
[9] X. Jiang, G.S. Li, F.M. Shen. Study on improving the softening-melting properties of MgO bearing iron ores. Journal of Northeastern University (Natural Science), 2007, 28(3): 365-369.