Effect of Al<SUB>2</SUB>O<SUB>3</SUB> Content on Sinter Cake Structure

Liquidus Lines in the Fe-rich Region of the FeO_x–CaO–SiO₂–Al₂O₃ System at 1573 K under Oxygen Partial Pressures between 10⁻⁶ and 10⁻² atm

“…4,5) However, the phase equilibria of the FeO x -SiO 2 -CaO system containing Al 2 O 3 have been investigated in air 6) and in the limited compositional ranges, which are insufficient to deal with ores with high Al 2 O 3 content.…”

Role of MgO in Sinter from Perspective of MgO Distribution between Liquid and Magnetite Phases in FeO_x–CaO–SiO₂–MgO System

“…Miyuki HAYASHI, 1) * Hiroki TANAKA, 2) Takashi WATANABE 1) and Masahiro SUSA The chemical compositions of liquid in equilibrium with FeO x in the FeO x -CaO-SiO 2 -MgO system at 1 573 K and oxygen partial pressures of 10 − 7 atm and 10 − 6 atm have been determined along with the MgO concentrations in the liquid and FeO x phases to understand the role of MgO in improvement of reducibility of the sinter produced from deteriorated iron ores. The liquid area in the FeO x -rich side was decreased with additions of MgO over the measurement range of C/S ratios between 0.32 and 2.28, and was separated into silicate-based and calcium ferrite-based liquid phases, where 2CaO·SiO 2 phase becomes stable thermodynamically in the C/S ratios between 1.66 and 1.96.…”

“…Iron ores contains more phosphorus, combined water and alumina concentrations than before, which brings about various problems for the blast furnace operation. [1][2][3][4] In particular, the increase of Al 2 O 3 content in iron ore is very serious because Al 2 O 3 lowers the reducibility of iron ore sinter and decreases the gas permeability in a blast furnace. 5,6) To overcome these problems, many attempts have been done, such as introducing micro pores into the sinter, 7) decreasing the volumes of gangue minerals in the sinter 7) and optimizing the compositions 4,[8][9][10] of gangue minerals in the sinter.…”

Crystalline Phase Quantitation of Sintered Ore with Powder X-ray Diffractometry with Rietveld Refinement

“…According to the fitting patterns and the R factors, the observed diffraction patterns largely match the calculated patterns. Generally speaking, the ratio [44][45][46] of ingredients composing sintered ore is 40-70 mass% iron ores, 20-50 mass% ferrites (most of which are SFCA), < 10 mass% glasses, and < 10 mass% calcium silicates. The results (Table 2) of the XRD/Rietveld refinement are within these reported ranges.…”