Influence of Al2O3 on liquidus line of the FeOx-SiO2 system at 1523 and 1573 K

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In order to investigate the influence of Al2O3 on the FeOx-SiO2 phase diagram, experiments of phase equilibrium were investigated with 0 to 9 mass-% Al2O3, in oxygen potential of log pO2 = - 8.5 to -7 at 1523 and 1573 K. As a result, the liquidus line on SiO2 saturation moves to the lower value side of Fe/SiO2 with increasing Al2O3 concentration in the molten slag. In addition, it was found that the liquidus line of FeOx moves to the lower value side of Fe/SiO2 with the increase of the Al2O3 concentration in the molten slag. It was also found that the uniform melt range spreads with the rise in temperature. In the log pO2 = - 8 and 1573 K, 65 mass-% FeOx and 35 mass-%SiO2 slag which is a general copper smelting slag of Fe/SiO2 = 1.4 shows in a uniform melt at 0 mass-% Al2O3. When the Al2O3 concentration increased over 8 mass-%, Spinel was precipitated in the slag. In the case of the slag of Fe/SiO2 = 1.4, it is necessary to reduce the concentration of Al2O3 in the slag to lower than 8 mass-%. When the oxygen partial pressure increases from log pO2 = - 8 to - 7, the liquidus on the SiO2 side moves to the high Fe/SiO2 side, and the liquidus on the FeOx moves to the lower Fe/SiO2 side, and the homogeneous liquid phase was narrow. In the case of a slag of log pO2 = - 7 and Fe/SiO2 = 1.4, Spinel precipitates at about 5 mass-% Al2O3. An increase in oxygen partial pressure promotes the formation of spinel at lower Al2O3 concentrations.

Original languageEnglish
Title of host publicationProceedings of the 10th European Metallurgical Conference, EMC 2019
PublisherGDMB Verlag GmbH
Pages1331-1338
Number of pages8
ISBN (Electronic)9783940276896
Publication statusPublished - 2019
Event10th European Metallurgical Conference, EMC 2019 - Dusseldorf, Germany
Duration: 2019 Jun 232019 Jun 26

Publication series

NameProceedings of the 10th European Metallurgical Conference, EMC 2019
Volume3

Conference

Conference10th European Metallurgical Conference, EMC 2019
CountryGermany
CityDusseldorf
Period19/6/2319/6/26

Keywords

  • Copper Smelting Slag
  • Magnetite
  • Phase Diagram

ASJC Scopus subject areas

  • Metals and Alloys

Fingerprint Dive into the research topics of 'Influence of Al<sub>2</sub>O<sub>3</sub> on liquidus line of the FeO<sub>x</sub>-SiO<sub>2</sub> system at 1523 and 1573 K'. Together they form a unique fingerprint.

  • Cite this

    Yamaguchi, K. (2019). Influence of Al2O3 on liquidus line of the FeOx-SiO2 system at 1523 and 1573 K. In Proceedings of the 10th European Metallurgical Conference, EMC 2019 (pp. 1331-1338). (Proceedings of the 10th European Metallurgical Conference, EMC 2019; Vol. 3). GDMB Verlag GmbH.