Equilibrium phase relations of CaO-SiO2-TiO2 system at 1400 °C and oxygen partial pressure of 10-10 atm

被引：32

作者：

Wan, Xingbang ^{[1
]}

Shi, Junjie ^{[1
,2
,3
]}

Klemettinen, Lassi ^{[1
]}

Chen, Min ^{[1
]}

Taskinen, Pekka ^{[1
]}

Jokilaakso, Ari ^{[1
]}

机构：

[1] Aalto Univ, Sch Chem Engn, Dept Chem & Met Engn, POB 16100, FI-00076 Aalto, Finland

[2] Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China

[3] Northeastern Univ, Minist Educ, Key Lab Ecol Met Multimet Mineral, Shenyang 110819, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 847卷

关键词：

Ithermodynamic; Equilibrium; Ilmenite; Titanomagnetite; Smelting reduction; O SYSTEM; ILMENITE; LIQUIDS; DIAGRAM; MTDATA;

D O I：

10.1016/j.jallcom.2020.156472

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The equilibrium phase relations and liquidus contours for the TiOx-containing oxide system in reducing atmospheres are of importance in understanding the smelting process of Ti-containing resources. Equilibrium - quenching experiments were conducted at 1400 degrees C for the CaO-SiO2-TiOx system at oxygen partial pressure of 10(-10) atm controlled by a CO/CO2 gas mixture. The equilibrium phase compositions were analyzed by scanning electron microscopy - energy dispersive X-ray spectrometry. Perovskite, wollastonite, rutile, and silica were found to coexist with liquid oxide. The 1400 degrees C isotherm was then constructed for the CaO-SiO2-TiOx system, and the results revealed that lower oxygen partial pressures led to shrinkage of the rutile and wollastonite primary phase areas. The comparisons with the calculated sections by FactSage and MTDATA indicated that the oxygen partial pressure has an obvious influence on the molten phase domain and clear deviations from experimental data mainly existed in the primary phase field of rutile. Therefore, the present results are significant for updating the current TiOx-containing thermodynamic databases, giving a deeper understanding of the related high temperature processes. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：7

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