Phase Equilibrium Investigation for CaO-SiO₂-5wt.%MgO-20wt.%Al₂O₃-TiO₂ System Relevant to Ti-bearing Slag System

Phase Equilibrium Study of the CaO-SiO2-MgO-Al2O3-TiO2 System at 1300°C and 1400°C in Air

“…Similar observations were also reported by Wang et al, 28 who compared predictions by Factsage with experimental data from different authors. 19,41,42 It was found that up to 130°C higher liquidus temperatures existed in the computational primary phase field of rutile. According to Wang et al, 28 the main reason for the disagreement was that the properties of the primary phase fields of spinel, as well as the pseudobrookite primary phase fields, for example, were not detailed enough in the thermodynamic databases of Factsage.…”

Effect of Al₂O₃ Addition on the Phase Equilibria Relations of CaO-SiO₂-5 wt%MgO-Al₂O₃-TiO₂ System Relevant to Ti-bearing Blast Furnace Slag

“…In order to clarify the transformation of equilibria phase relations related to practical composition of Ti-bearing slag system, the compositions of the experimental samples were designed mainly basing on the typical composition 29,30) of Ti-bearing slag ( Table 1) generated from the high blast furnace smelting process. During last few years, the equilibria phase relations at constant Al 2 O 3 content of 10 wt%, 28,35) 20 wt% 26) and 30 wt% 27) with varying w(CaO)/w(SiO 2 ) were continuous investigated by present authors, 25) which lays the foundation of studying equilibria phase relations for Ti-bearing slag system and makes it possible to carry out the analysis of the influence of Al 2 O 3 addition on the equilibria phase relations for CaO-SiO 2 -MgO-Al 2 O 3 -TiO 2 system. Therefore, samples from previous studies [25][26][27][28]35) with fixed w(CaO)/w(SiO 2 ) of 1.00 and different Al 2 O 3 content up to 30 wt% were selected to analysis the influence of Al 2 O 3 addition on the equilibria phase relations, and the projections of the sample compositions in tetrahedron and pseudo-ternary phase diagrams were shown in Figs.…”

“…Equilibria Experiment The experimental processes have been explained in detail in previous works [25][26][27][28]35) and will be simply described in this section. Generally, the experimental process could be divided into two parts, i.e.…”

“…Inspired by the SCPS technique with anosovite phase as the Ti-rich phase, Zhen Wang et al 18,22) conducted the phase equilibria study for the TiO 2 rich part of CaO-SiO 2 -TiO 2 -10wt%Al 2 O 3 system 18) and CaO-SiO 2 -TiO 2 -10wt%Al 2 O 3 -5wt%MgO system 22) to explore the primary crystal field of anosovite phase, however, the primary phase region of anosovite phase was not found within the composition and temperature ranges studied by Zhen Wang et al 18,22) Zhao et al 23 As point out and studied by Zhongmin Li et al 24) that the precipitation of Ti-rich phases could be obviously influenced by the addition of Al 2 O 3 , therefore, the phase equilibria relations for CaO-SiO 2 -MgO-Al 2 O 3 -TiO 2 system with the addition of Al 2 O 3 up to 30 wt% will be studied in present work, which is also a part of continuous researches aim at systematic studying the thermodynamic properties for Ti-bearing slag conducted during the past few years. [25][26][27][28]35) The results from present work will not only provide direct thermodynamic data for the comprehensive recovery of Ti-bearing slag and the high blast furnace smelting process of magnetite ore, but also can be served as important references for the optimization and development of Ti-containing thermodynamic database, i.e. Factsage, and HSC software, etc.…”

The Online Research of B2O3 on Crystal Behavior of High Ti-Bearing Blast Furnace Slag

“…Tasuku and Fumitaka [7] studied the effect of B 2 O 3 additives on desulfurization capacity in FeOx-CaO-MgO satd -SiO 2 slag at the temperature of 1300°C. Shi et al [8] studied the phase equilibrium law of CaO-SiO 2 -5wt.%MgO-20wt.%Al 2 O 3 -TiO 2 system at 1300°C and 1400°C by SEM-EDS, XRD, and XRF. Li et al [9] performed some studies about the effect of Al 2 O 3 additives on precipitated phase transformation, and the results showed that Al 2 O 3 additives could prompt phase change from perovskite to low melting point phase.…”