Abstract
The influence mechanism of vanadic titanomagnetite solid-state reduction was studied in this paper. Optical microscopy (OM), scanning electron microscope (SEM), and X-ray diffraction (XRD) were used to characterize the structure and phases of the samples. The results show that the dense structure is not the reason that limits the reducibility of Panxi vanadic titanomagnetite. Metallization rate of 93 % was achieved when it was reduced at 1100 °C for 100 min. After pre-oxidation, Fe9TiO15 and Fe2O3 are the main phases of samples. Pre-oxidation could destroy the dense structure of vanadic titanomagnetite and increase the specific surface area of particles. However, reducibility of vanadic titanomagnetite is not improved obviously by pre-oxidation, with metallization rate increasing only 1 % under the same reduction conditions, and the generated metallic iron grains are smaller. Phase transformation of vanadic titanomagnetite at different reduction temperatures shows that the presence of FeTi2O5 is the main reason that limits the reducibility of Panxi vanadic titanomagnetite.
Similar content being viewed by others
References
Si XG, Lu XG, Li CW, Li CH, Ding WZ. Phase transformation and reduction kinetics during the hydrogen reduction of ilmenite concentrate. Int J Miner Metal Mater. 2012;19(5):384.
Chen DS, Song B, Wang LN, Qi T, Wang Y, Wang WJ. Solid state reduction of Panxi titanomagnetite concentrates with pulverized coal. Miner Eng. 2011;24(8):864.
Han YF, Sun TC, Li J, Qi T, Wang LN, Qu JK. Preparation of titanium dioxide from titania-rich slag by molten NaOH method. Int J Miner Metal Mater. 2012;19(3):205.
Han GH, Jiang T, Zhang YB, Huang YF, Li GH. High-temperature oxidation behavior of vanadium, titanium-bearing magnetite pellet. J Iron Steel Res Int. 2011;18(8):14.
Liu XH, Gai GS, Yang YF, Sui ZT, Li L, Fu JX. Kinetics of the leaching of TiO2 from Ti-bearing blast furnace slag. J China Univ Min Technol. 2008;18(2):275.
Liu YM, Lv H, Qi T, Zhang Y. Extraction behaviours of titanium and other impurities in the decomposition process of ilmenite by highly concentrated KOH solution. Int J Miner Metal Mater. 2012;19(1):9.
Li J, Zhang ZT, Zhang M, Guo M, Wang XD. The influence of SiO2 on the extraction of Ti element from Ti-bearing blast furnace slag. Steel Res Int. 2011;82(6):607.
Taylor PR, Shuey SA, Vidal EE, Gomez JC. Extactive metallurgy of vanadium-containing titaniferous magnetite ores, review. Miner Metal Proc. 2006;23(2):80.
Fu WG, Wen YC, Xie HE. Development of intensified technologies of vanadium-bearing titanomagnetite smelting. Iron Steel Res Int. 2011;18(4):7.
Zhou LH, Wang J, Gou SY, Chen LY, Li ZR. Development of utilization of vanadic titanomagnetite. Appl Mech Mater. 2012;184:949.
Ye GH, He W, Tong X, Wu N. Extracting vanadium from argillaceous vanadium ore by direct acid leaching without grinding and roasting. Chin J Rare Met. 2013;37(4):621.
Wang F, Zhang YM, Huang J, Liu T, Wang Y, Yang X, Zhao J. Mechanisms of aid-leaching reagent calcium fluoride in the extracting vanadium processes from stone coal. Rare Met. 2013;32(1):57.
Hukkanen E, Walden H. The production of vanadium and steel from titanomagnetites. Int J Miner Process. 1985;15(1–2):89.
Gonzalez LM, Forssberg K. Utilization of a vanadium-containing titanomagnetite, possibilities of a beneficiation-based approach. Miner Process Extr Metall. 2011;110(2):63.
Zhang GH, Yan Z, Feng YJ, Zhang M, Guo M, Wang XD, Li LF, Zhou GZ. Reduction kinetics of vanadic titanomagnetite in Panzhihua. J Chin Rare Earth Soc. 2008;26(s1):210.
Qi DG, Yan GN, Zhang GX, Fan ZZ. The reduction mechanism study of vanadium-titanium magnetite. Chem Eng Metall. 1980;(2):166.
Zhang JL, Wang CL, Liu ZJ, Wang J, Cao MM. Influencing factors of the reduction of vanadium titano-magnetite carbon composite pellets. J Univ Sci Technol Beijing. 2012;34(5):512.
Cao MM, Zhang JL, Xing XD, Wen YC, Wang CL. Study on direct reduction of carbon-containing pellet made of vanadium-bearing titaniferous magnetite. Iron Steel Vanadium Titanium. 2012;33(4):28.
Zhou LH, Tao DP, Fang MX, Zeng FH, Pu X. Carbothermic reduction of V-Ti magnetite ore. Chin J Rare Met. 2009;33(3):406.
Xu JC, Yang YY, Liu ZH, Fu BY, Yu KT, Cai RZ, Liu YY, Zhang QC, Li SG, Liao CY, Dai BH. New technology of coal-based direct reduction of cold bond pellets with complex binders. Chinese Patent, No.CN92111782.5, 1994.
Guo YF, You G, Jiang T, Qiu GZ. Solid-state reduction behavior of Panzhihua ilmenite. J Cent South Univ. 2010;41(5):1639.
Acknowledgments
This study was financially supported by the Program for New Century Excellent Talents in University (No. NCET-10-0834).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Liu, SS., Guo, YF., Qiu, GZ. et al. Mechanism of vanadic titanomagnetite solid-state reduction. Rare Met. 39, 1348–1352 (2020). https://doi.org/10.1007/s12598-014-0294-3
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12598-014-0294-3