Effect of TiO 2 on the Crushing Strength and Smelting Mechanism of High-Chromium Vanadium-Titanium Magnetite Pellets
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HIGH-CHROMIUM vanadium-titanium magnetite (hereinafter abbreviated as high-Cr V-Ti magnetite), rich in valuable elements including Fe, V, Ti, and Cr, is a kind of significant mineral resources with great developing value.[1–4] In Panxi-Hongge District in China, there is more than 3.5 billion tons of high-Cr V-Ti magnetite. Domestic high-chromium vanadiumtitanium magnetite has not been exploited and made full use of on a large scale so far because of the immature utilization technology of the furnace slag and due to the fact that the utilization efficiency of valuable metals still urgently needs to be improved. Thus, it is significative to study the utilization of this special mineral resource. During the last decade, considerable quantities of researches of ordinary V-Ti magnetite have been done.[5–15] However, study on high-Cr V-Ti magnetite has been scarce.[2,3,16] Cr2O3, a refractory oxide, affects the blast furnace reduction and slagging process; furthermore, chromium in molten iron significantly affects the follow-up converter vanadium extraction process.[4] GONGJIN CHENG, Ph.D. Candidate, XIANGXIN XUE and TAO JIANG, Professors, and PEINING DUAN, Senior Engineer, are with the School of Materials and Metallurgy, Northeastern University, Shenyang 110819, P.R. China. Contact e-mail: [email protected]. edu.cn Manuscript submitted August 23, 2015. Article published online March 21, 2016. METALLURGICAL AND MATERIALS TRANSACTIONS B
Therefore, it is of great necessity to study the Cr-containing V-Ti magnetite. As is known, the blast furnace is the major iron producing unit and will remain so for the foreseeable future. At present, the feasible and mainstream utilization process of high-Cr V-Ti magnetite should also be the route of agglomeration-blast furnace smelting.[1–3,16] Thus, pelleting production is the foundation for high-Cr V-Ti magnetite utilization. Xu studied the crushing strength change regulation and pellet microstructure of the oxidized pellets with the high-Cr V-Ti magnetite before and after being ground as the original materials.[17] Ou made researches on the effect of the MgO on the crushing strength of high-Cr V-Ti magnetite pellets.[18] However, till now there are no research documentations on the effect of TiO2 on the high-Cr V-Ti magnetite pelleting at home and abroad, let alone on the high-Cr V-Ti magnetite smelting mechanism in the blast furnace. Cheng et al.[2] studied the non-isothermal reduction mechanism and kinetics of high-chromium vanadium-titanium magnetite pellets under the simulated conditions of the lumpy zone of the blast furnace. Liu et al.[3] studied the reduction process of pellet containing high chromic vanadium-titanium magnetite in cohesive zone. Paananen et al.[19] researched the effect of TiO2 content on reduction of iron ore agglomerates, realized on the basis of adding rutile to magnetite and hematite concentrate. In addition, it is well known that TiO2 has great influence on the smelting of V-Ti magnetite, and it is supposed that TiO2 should have VOLUME 47B, JUNE 2016—1713
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