Effect of Al2O3 and MgO Additions on Liquidus for the CaO-SiO2-FeOx System at 1573 K

Thermodynamic Calculation of Liquidus Surface of FeOx–CaO–SiO2 System

“…10 that the temperature has a significant effect on the stability of wustite/magnetite, hence the liquidus of the wustite/mag- netite saturation region, where the composition of the sinter mixture falls in. 11) and Kimura et al 24) As can be seen, there is significant difference between the model prediction and the experimental data by Kimura et al,24) particular at the oxygen partial pressure of 10 Ϫ3 and 10 Ϫ6 atm. As pointed out by Matsuura et al, 8) the solid phases which coexist with the melt prior to quench were not accounted by Kimura et al 4,24) As Al 2 O 3 is introduced into the system, solid phase such as melilite is likely to precipitate from the melt.…”

Summarized Achievements of the Porous Meso-mosaic Texture Sinter Research Project

“…Also, the micro-pores of 10 mm or less reported by Sasaki et al 12) do not readily combine regardless of the melt viscosity or liquid phase ratio, unlike the macro pores, and are retained in the texture of the sinter. On the other hand, according to Tsukihashi et al's study, 19) increasing the content of CaO or FeO is an effective way of reducing the solid phase ratio of the melt and changing pores into voids. As a bed structure column assuming a blend with a large amount of limonite, Otomo's study 11) showed that there must be at least 20 % or so of fine grains that do not assimilate, and that it is important to maintain a solid phase ratio by mixing together fine and rough grain sizes so that thermal cracks do not readily form in order to maintain the solid phase ratio.…”

“…21, right side), the liquid phase ratios at points PЈ and FЈ corresponding to the abovementioned points P and F are found to be 50 % and 100 % respectively, which corresponds to suppression of assimilation of coarse grains and promotion of the assimilation of the powder bed. Furthermore, Tsukihashi et al's phase diagram 19) suggests that it might be possible to control the liquid phase ratio with the gradient of Al 2 O 3 and MgO. For a coarse granulated material, the addition of MgO to a composition where CaO/SiO 2 ϭ1 is preferable, but since these are conditions where the liquid phase ratio is small, it is important to use a fine granulated material to facilitate the expression of strength.…”

“…tion Properties According to the liquid phase diagram produced by Tsukihashi et al 19) (Fig. 21, right side), reducing the CaO and SiO 2 constituents in the sintered ore results in a smaller liquid phase ratio and lower strength in the sinter production process, but it is thought that the liquid phase ratio can be increased and the strength can be maintained by reducing the oxygen partial pressure.…”

Effect of Coarse-grain and Low-grade Iron Ores on Sinter Properties

“…13,15) Other components have shown different effects. 26) In the current study, the phase diagrams of Fe 2 O 3 -CaOSiO 2 system corresponding to the compositions of the three coarse-grain and low-grade ores were produced using FactSage™ 7.0, and the effect of ore gangue content on liquid phase at a temperature of 1 200-1 350°C was investigated. Because of the small and comparable concentrations of FeO in the three original ores, the FeO content in the following diagrams was fixed at 1.0%.…”