Effect of ZrO2 on the phase relations for CaO-SiO2-TiO2 system related to efficient extraction of titanium from titania-bearing slag

IF 1.9 3区材料科学 Q4 CHEMISTRY, PHYSICAL Calphad-computer Coupling of Phase Diagrams and Thermochemistry Pub Date : 2024-04-28 DOI:10.1016/j.calphad.2024.102698

Ningning Lv , Yuchao Qiu , Junjie Shi , Chang Su

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Abstract

The selective crystallization and phase separation process has been regarded as a promising process for the recycling of titanium from titania-bearing furnace slag, however, the composition modification mechanism still remains unclear due to the lack of fundamental thermodynamic data. In the present work, the influence of ZrO₂ addition on the equilibrium phase relations and the 1400 °C isotherm for CaO-SiO₂-TiO₂ system were experimentally determined by using the high temperature equilibration-quenching technique, and Scanning Electron Microscopy-Energy Dispersive X-ray Spectrometry, and X-ray diffraction analysis. The equilibrium solid phases of rutile (TiO₂), perovskite (CaTiO₃), and tridymite (SiO₂) are determined to be coexisting with the liquid phase. In addition, comparisons of present results with thermodynamic calculation by FactSage show significant discrepancies. The present work is important for enriching the thermodynamic database of titania-bearing slag oxide systems as well as optimizing the selective crystallization and phase separation process.

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ZrO2 对 CaO-SiO2-TiO2 体系相关系的影响与从含钛渣中高效提取钛有关

选择性结晶和相分离过程一直被视为从含钛炉渣中回收钛的一种前景广阔的工艺，但由于缺乏基本的热力学数据，其成分改变机制仍不清楚。本研究采用高温平衡-淬火技术、扫描电子显微镜-能量色散 X 射线光谱法和 X 射线衍射分析法，实验测定了 ZrO2 添加量对 CaO-SiO2-TiO2 体系平衡相关系和 1400 ℃ 等温线的影响。确定了金红石（TiO2）、透辉石（CaTiO3）和三菱锰矿（SiO2）的平衡固相与液相共存。此外，将本研究结果与 FactSage 的热力学计算结果进行比较，发现两者之间存在显著差异。本研究对丰富含二氧化钛矿渣氧化物体系的热力学数据库以及优化选择性结晶和相分离过程具有重要意义。

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来源期刊

Calphad-computer Coupling of Phase Diagrams and Thermochemistry 化学-热力学

CiteScore

4.00

自引率

16.70%

发文量

审稿时长

2.5 months

期刊介绍： The design of industrial processes requires reliable thermodynamic data. CALPHAD (Computer Coupling of Phase Diagrams and Thermochemistry) aims to promote computational thermodynamics through development of models to represent thermodynamic properties for various phases which permit prediction of properties of multicomponent systems from those of binary and ternary subsystems, critical assessment of data and their incorporation into self-consistent databases, development of software to optimize and derive thermodynamic parameters and the development and use of databanks for calculations to improve understanding of various industrial and technological processes. This work is disseminated through the CALPHAD journal and its annual conference.