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Experimental Study on the Activities of Al and Ca in Ferrosilicon
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
2017 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 48, no 6, p. 3251-3258Article in journal (Refereed) Published
Abstract [en]

Experiments were carried out to determine the activities of Al and Ca in liquid ferrosilicon (with about 50 wt pct Si) at 1823 K (1550 A degrees C) in their dilution ranges. Liquid FeSi50 and SiO2-Al2O3-CaO slag were stirred mechanically in a graphite crucible to enhance the transfer of Al and Ca between the two phases. The stirring time for the two phases to reach equilibrium was studied. It was found that a time of 45 minutes was long enough to reach the slag-metal equilibrium. The activities of Al and Ca in the ferrosilicon alloy were calculated based on the compositions of the two liquid phases. The activity coefficients obtained for Al and Ca in the liquid FeSi50 at 1823 K (1550 A degrees C) were found to be nearly constant in the composition range studied.

Place, publisher, year, edition, pages
Springer, 2017. Vol. 48, no 6, p. 3251-3258
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-219498DOI: 10.1007/s11663-017-1119-1ISI: 000415806100040Scopus ID: 2-s2.0-85032699157OAI: oai:DiVA.org:kth-219498DiVA, id: diva2:1163600
Note

QC 20171207

Available from: 2017-12-07 Created: 2017-12-07 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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Tomé Torquemada, SilviaSichen, Du

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