Effect of Cr₂O₃ on the Reduction and Smelting Mechanism of High-Chromium Vanadium-titanium Magnetite Pellets

Coal-Based Reduction and Magnetic Separation Behavior of Low-Grade Vanadium-Titanium Magnetite Pellets

“…By analyzing the black areas H, K, and L, with corresponding results shown in Figure 8b-d, it is found that silicate phases, especially calcium silicate phases, transformed from calcium ferrite that was found at 1100 °C (see area G) with EDS analysis in Figure 8a, were observed and gradually aggregated with the increase in the temperature from 1200 °C to 1350 °C. However, some silicate phases were infiltrated into metallic iron since it appears that chromium carbides, and especially titanium carbides that were also found in the above XRD analysis, could probably contribute to the sintering phenomenon becoming serious at 1400 °C because it is well-known that those carbides Figure 8b-d, it is found that silicate phases, especially calcium silicate phases, transformed from calcium ferrite that was found at 1100 • C (see area G) with EDS analysis in Figure 8a, were observed and gradually aggregated with the increase in the temperature from 1200 • C to 1350 • C. However, some silicate phases were infiltrated into metallic iron since it appears that chromium carbides, and especially titanium carbides that were also found in the above XRD analysis, could probably contribute to the sintering phenomenon becoming serious at 1400 • C because it is well-known that those carbides with high melting points can increase the viscosity of the metallic iron and the slag, which would result in the hanging and diffusing of the slag in the metallic iron [4,25]. It has also been found that the slag and metallic iron were very difficult to separate from experimental studies of melting separation, thus, magnetic separation was employed to separate the magnetic and non-magnetic products.…”

“…Minerals 2017, 7, 86 9 of 13 with high melting points can increase the viscosity of the metallic iron and the slag, which would result in the hanging and diffusing of the slag in the metallic iron [4,25]. It has also been found that the slag and metallic iron were very difficult to separate from experimental studies of melting separation, thus, magnetic separation was employed to separate the magnetic and non-magnetic products.…”

Effect of TiO2 on the Sintering Behavior of Chromium-Bearing Vanadium–Titanium Magnetite

“…The calculation equation of productivity is given in Equation (1): 2 Return mine. 3 Gas-ash. 4 Magnetic powder.…”

“…As a kind of valuable iron ore resource, Hongge CVTM is found in the Panzhihua area in China. Similar types of ores are mainly distributed in Russia, Canada, Australia and other places [3,4]. As it is known, many studies have been done for the ordinary VTM, while the studies on CVTM with complex phase compositions and different properties are scarce [5,6].…”

Effects of Preheating Temperature and Time of Hongge Vanadium Titanomagnetite Pellet on Its Gas-Based Direct Reduction Behavior with Simulated Shaft Furnace Gases

“…6) Compared with the BF process, several new processes on the basis of direct reduction containing coal of HVTM or other minerals have been widely studied. [7][8][9][10][11][12][13][14][15][16][17] Zhao et al 8) surveyed the reduction behaviors of FeO·V 2 O 3 and FeO·Cr 2 O 3 during coal-based direct reduction of HVTM and the effects on the elements distribution in the subsequent magnetic separation.…”