ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Experimental Determination of the Phase Diagram for CaO-SiO2-MgO-10%Al2O3-5%TiO2 System
Junjie ShiLifeng SunJiyu QiuZhaoyun WangBo ZhangMaofa Jiang
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2016 Volume 56 Issue 7 Pages 1124-1131

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Abstract

The phase diagrams of Ti-bearing slag have fundamental guiding significance for the comprehensive utilization of Ti resources. In this article, the pseudo-melting temperatures were determined by the single hot thermocouple technique (SHTT) and high equilibrium experiments for the specified contents of 5% to 15% MgO in the CaO-SiO2-MgO-10%Al2O3-5%TiO2 phase diagram system. The 1250°C to 1350°C liquidus lines were firstly calculated based on the thermodynamic equations in the specific primary crystal field. The phase equilibrium relationship was determined experimentally at 1300°C using the high temperature experimental technique followed by X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Energy Dispersive X-ray spectroscope (EDX) analysis, and the liquid Phase, liquid coexist with solid solution phase of (2CaO·MgO·2SiO2, 2CaO·Al2O3·SiO2)ss were found. Therefore, the phase diagram was constructed for the specified region of the CaO-SiO2-MgO-10%Al2O3-5%TiO2 system, which was consistent with the existing phase diagram except for somewhat larger liquidus area at 1300°C. The comparison proved that the combination of liquidus temperature determination by SHTT and the high temperature experimental technique was enabled to construct the correct phase diagram for slag systems.

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© 2016 by The Iron and Steel Institute of Japan
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