Phase relations of the MgO–SiO2–CrOx system at 1600°C in air and reducing atmospheres

Min Chen; Dmitry Sukhomlinov; Pekka Taskinen; Mia Tiljander; Daniel Lindberg; Ari Jokilaakso

doi:10.1111/jace.19207

Phase relations of the MgO–SiO₂–CrO_x system at 1600°C in air and reducing atmospheres

Min Chen, Dmitry Sukhomlinov, Pekka Taskinen, Mia Tiljander, Daniel Lindberg, Ari Jokilaakso^*

^*Corresponding author for this work

Geological Survey of Finland

Research output: Contribution to journal › Article › Scientific › peer-review

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Abstract

The equilibrium phase relations of the MgO–SiO₂–CrO_x system were investigated at 1600°C in air and at pO₂ of 10^–10 to 10^–11 atm using a high-temperature isothermal equilibration technique followed by rapid quenching and direct phase composition analyses with electron probe X-ray microanalysis. Two-phase equilibria (liquid–cristobalite, liquid–spinel, liquid–corundum, and liquid–olivine) and three-phase equilibria (liquid–cristobalite–spinel, liquid–olivine–spinel, liquid–spinel–corundum, and cristobalite–spinel–corundum) were observed. The 1600°C isothermal sections at various oxygen partial pressures were constructed for the MgO–SiO₂–CrO_x system based on the experimentally determined liquid and solid compositions. Data from the literature and the predictions by FactSage and MTDATA software were compared with the present experimental results.

Original language	English
Pages (from-to)	6230-6243
Number of pages	14
Journal	Journal of the American Ceramic Society
Volume	106
Issue number	10
Early online date	25 May 2023
DOIs	https://doi.org/10.1111/jace.19207
Publication status	Published - Oct 2023
MoE publication type	A1 Journal article-refereed

Keywords

chromium oxide
electrolytic ferrochromium
phase diagram
thermodynamics
waste management

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1111/jace.19207Licence: CC BY-NC-ND

CHEM_Chen_et_al_Phase_Relations_2023_J_Am_Ceram_SocFinal published version, 3.39 MBLicence: CC BY-NC-ND

Cite this

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title = "Phase relations of the MgO–SiO2–CrOx system at 1600°C in air and reducing atmospheres",

abstract = "The equilibrium phase relations of the MgO–SiO2–CrOx system were investigated at 1600°C in air and at pO2 of 10–10 to 10–11 atm using a high-temperature isothermal equilibration technique followed by rapid quenching and direct phase composition analyses with electron probe X-ray microanalysis. Two-phase equilibria (liquid–cristobalite, liquid–spinel, liquid–corundum, and liquid–olivine) and three-phase equilibria (liquid–cristobalite–spinel, liquid–olivine–spinel, liquid–spinel–corundum, and cristobalite–spinel–corundum) were observed. The 1600°C isothermal sections at various oxygen partial pressures were constructed for the MgO–SiO2–CrOx system based on the experimentally determined liquid and solid compositions. Data from the literature and the predictions by FactSage and MTDATA software were compared with the present experimental results.",

keywords = "chromium oxide, electrolytic ferrochromium, phase diagram, thermodynamics, waste management",

author = "Min Chen and Dmitry Sukhomlinov and Pekka Taskinen and Mia Tiljander and Daniel Lindberg and Ari Jokilaakso",

note = "Funding Information: This work was partly financed by Aalto University, School of Chemical Engineering, and the TOCANEM project funded by Business Finland (grant number: 2118452). The utilization of the Academy of Finland's RawMatTERS Finland Infrastructure (RAMI) based at Aalto University, GTK Espoo, and VTT Espoo is acknowledged. Publisher Copyright: {\textcopyright} 2023 The Authors. Journal of the American Ceramic Society published by Wiley Periodicals LLC on behalf of American Ceramic Society.",

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AU - Taskinen, Pekka

AU - Tiljander, Mia

AU - Lindberg, Daniel

AU - Jokilaakso, Ari

N1 - Funding Information: This work was partly financed by Aalto University, School of Chemical Engineering, and the TOCANEM project funded by Business Finland (grant number: 2118452). The utilization of the Academy of Finland's RawMatTERS Finland Infrastructure (RAMI) based at Aalto University, GTK Espoo, and VTT Espoo is acknowledged. Publisher Copyright: © 2023 The Authors. Journal of the American Ceramic Society published by Wiley Periodicals LLC on behalf of American Ceramic Society.

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N2 - The equilibrium phase relations of the MgO–SiO2–CrOx system were investigated at 1600°C in air and at pO2 of 10–10 to 10–11 atm using a high-temperature isothermal equilibration technique followed by rapid quenching and direct phase composition analyses with electron probe X-ray microanalysis. Two-phase equilibria (liquid–cristobalite, liquid–spinel, liquid–corundum, and liquid–olivine) and three-phase equilibria (liquid–cristobalite–spinel, liquid–olivine–spinel, liquid–spinel–corundum, and cristobalite–spinel–corundum) were observed. The 1600°C isothermal sections at various oxygen partial pressures were constructed for the MgO–SiO2–CrOx system based on the experimentally determined liquid and solid compositions. Data from the literature and the predictions by FactSage and MTDATA software were compared with the present experimental results.

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KW - thermodynamics

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Phase relations of the MgO–SiO₂–CrO_x system at 1600°C in air and reducing atmospheres

Abstract

Keywords

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Phase relations of the MgO–SiO2–CrOx system at 1600°C in air and reducing atmospheres

Abstract

Keywords

UN SDGs

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-: TOCANEM, TDM

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Raw Materials Research Infrastructure

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Phase relations of the MgO–SiO₂–CrO_x system at 1600°C in air and reducing atmospheres