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Experimental study of the phase relationships in the SiO2-SrO-Al2O3 system
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-3548-8638
2018 (English)In: Calphad, ISSN 0364-5916, E-ISSN 1873-2984, Vol. 62, p. 238-243Article in journal (Refereed) Published
Abstract [en]

The phase relationships in silica rich area in the SiO2-SrO-Al2O3 system were determined experimentally at 1723 K (1450 degrees C), 1823 K (1550 degrees C) and 1873 K (1600 degrees C) using quenching technique. Phases of the quenched samples were examined and identified using light optical microscopy (LOM), scanning electron microscope (SEM) and energy dispersive x-ray spectroscopy (EDS). X-ray Diffraction (XRD) was used to confirm the presence of solid phases. Based on the experimental results, the liquidus projections in the silica rich area for the studied temperatures were constructed.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2018. Vol. 62, p. 238-243
Keywords [en]
SiO2-SrO-Al2O3, Phase diagram, Quenching method, Experimental
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-235605DOI: 10.1016/j.calphad.2018.08.002ISI: 000444666200025Scopus ID: 2-s2.0-85051386453OAI: oai:DiVA.org:kth-235605DiVA, id: diva2:1252149
Note

QC 20181001

Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2019-03-29Bibliographically approved
In thesis
1. Studies of some thermodynamic aspects related to the production of silicon and ferrosilicon
Open this publication in new window or tab >>Studies of some thermodynamic aspects related to the production of silicon and ferrosilicon
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents a fundamental study on some thermodynamic aspects regarding the silicon and ferrosilicon production. The purity requirements for silicon and ferrosilicon alloys are stringent. In order to achieve a successful and efficient refining of the silicon and ferrosilicon produced by carbothermic reduction, it is of great importance to know the phase relations in the system and to have reliable thermodynamic, kinetic and other physical data for the elements involved.

The first part of the thesis includes a study of different phase relationships of the SrO-SiO2 and SiO2-SrO-Al2O3 systems. Experiments were performed to determine the phase relationships at temperatures between 1300 °C and 1625 °C in the binary system and at 1450 °C, 1500 °C and 1600 °C in the ternary system. The present result would be valuable when determining the compositions of the refining slags. A fully liquid slag would ensure favorable kinetic conditions in the refining process.

The activities of some metallic elements in the silicon melt were determined in the second part of the thesis. The activities of Sr, Al, Zr and Ca in silicon were experimentally determined at temperatures that varied between 1450 °C and 1600 °C. These activities would provide useful information regarding the process temperature and the design of refining slags.

The third part of the thesis covers the study of the activities in a ferrosilicon alloy. The activity coefficients for Al and Ca in FeSi50 were experimentally determined by equilibrating SiO2-Al2O3-CaO slags with ferrosilicon at 1550 °C. The activities obtained would be very useful information for the optimization of the refining process.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2019. p. 64
Series
TRITA-ITM-AVL ; 2019:13
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-247888 (URN)978-91-7873-157-2 (ISBN)
Public defence
2019-05-03, Sal F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2019-03-29 Created: 2019-03-29 Last updated: 2019-03-29Bibliographically approved

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