Phase Transformations and Thermodynamics of Binary Systems Fe2О3 - V2O5 and Fe2О3 - MnO at High Temperatures

Rossitza Paunova; Radost Alexandrova; Maksim Marinov

doi:doi:10.11648/j.ijmsa.20140302.17

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Phase Transformations and Thermodynamics of Binary Systems Fe2О3 - V2O5 and Fe2О3 - MnO at High Temperatures

Rossitza Paunova, Radost Alexandrova, Maksim Marinov

Published in International Journal of Materials Science and Applications (Volume 3, Issue 2)

Received: 13 February 2014 Published: 20 March 2014

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Abstract

The phase transformations and thermodynamics of the binary systems of Fe2O3-MnO2 as well as Fe2O3-V2O5 have been investigated. Pure oxides, waste vanadium catalyst (containing 4.12% V2O5) and manganese carbonate ore concentrate containing  44.56% MnO have been used for preparation of the mixtures. The purpose of these investigations was to study phase transformations, some thermodynamic characteristics of waste products, containing Fe-Mn-V-Si-O and further producing real Fe-Mn-V alloys from this products. Two methods have been used to study these systems. Four mixtures were prepared for the investigation: mix 1 - pure oxides - V2O5, Fe2O3, SiO2; mix 2 - waste vanadium catalyst, Fe2O3; mix 3 - pure oxides - MnO2, Fe2O3, SiO2; mix 4 - manganese concentrate, Fe2O3. Phase transformations have been defined by DTA and X-ray analysis up to 1473K. The formation of new phases FeV2O4 and MnFe2O4 (Jacobsite) in the samples can be formed up to this temperature only if in the initial materials there is waste vanadium catalyst and manganese concentrate. In the temperature range 853K – 953K solid solution between Fe2О3 and Мn2О3 is formed (for pure oxides – mix3) and then it decomposes peritectically at 1203K. The oxygen potential, respectively Gibbs energy in the temperature range 1073К – 1173К has been calculated using EMF method with reference electrode Ni/NiO. Gibbs energy values for mix 1 and mix 2 are very close compared to the theoretical indications calculated for Fe2O3. Gibbs energy for mix 3 is in compliance with the data of manganese oxide.

Published in	International Journal of Materials Science and Applications (Volume 3, Issue 2)
DOI	10.11648/j.ijmsa.20140302.17
Page(s)	49-57
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2014. Published by Science Publishing Group

Keywords

DTA Analysis, EMF Method, Gibbs Energy

References

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[3]	Takashi Miyano and Nicolas J. Beukes, Physicochemical environments for the formation of quartz-free manganese oxide ores from the early Proterozoic Hotazel Formation, Kalahari manganese field, South Africa, Economic Geology, 1 May 1987; vol. 82; No 3; pp 706-718.
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[12]	Jacob, K. T. ; Alcock, C. B. , The oxygen potential of the systems Fe+FeCr2O4+Cr2O3 and Fe+FeV2O4+V2O3 in the temperature range 750-1600°C, (1975), Metallurgical and Materials Transactions B, 6 (2). pp. 215-221.
[13]	Masataka Wakihara and Takashi Katsura, The Phase Equilibria in the FeO-Fe2O3-V2O3 system at 1500K, Bulletin of the Chemical Society of Japan, Vol.44, №11 (1971), pp3043-3046.
[14]	A Petric, K T Jacob, Thermodynamic Properties of Fe3O4-FeV2O4 and Fe3O4-FeCr2O4 Spinel Solid Solutions, Journal of the American Ceramic Society, Volume 65, Issue 2, February 1982, pages 117–123.
[15]	R. Paunova – "Thermodynamics study of reduction of titanium magnetite concentrate with solid carbon", "Metallurgical and Materials Transaction" B, 33B, 4, 2002, p 633 –638.
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APA Style

Rossitza Paunova, Radost Alexandrova, Maksim Marinov. (2014). Phase Transformations and Thermodynamics of Binary Systems Fe2О3 - V2O5 and Fe2О3 - MnO at High Temperatures. International Journal of Materials Science and Applications, 3(2), 49-57. https://doi.org/10.11648/j.ijmsa.20140302.17

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ACS Style

Rossitza Paunova; Radost Alexandrova; Maksim Marinov. Phase Transformations and Thermodynamics of Binary Systems Fe2О3 - V2O5 and Fe2О3 - MnO at High Temperatures. Int. J. Mater. Sci. Appl. 2014, 3(2), 49-57. doi: 10.11648/j.ijmsa.20140302.17

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AMA Style

Rossitza Paunova, Radost Alexandrova, Maksim Marinov. Phase Transformations and Thermodynamics of Binary Systems Fe2О3 - V2O5 and Fe2О3 - MnO at High Temperatures. Int J Mater Sci Appl. 2014;3(2):49-57. doi: 10.11648/j.ijmsa.20140302.17

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@article{10.11648/j.ijmsa.20140302.17,
  author = {Rossitza Paunova and Radost Alexandrova and Maksim Marinov},
  title = {Phase Transformations and Thermodynamics of Binary Systems Fe2О3 - V2O5 and Fe2О3 - MnO at High Temperatures},
  journal = {International Journal of Materials Science and Applications},
  volume = {3},
  number = {2},
  pages = {49-57},
  doi = {10.11648/j.ijmsa.20140302.17},
  url = {https://doi.org/10.11648/j.ijmsa.20140302.17},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmsa.20140302.17},
  abstract = {The phase transformations and thermodynamics of the binary systems of Fe2O3-MnO2 as well as Fe2O3-V2O5 have been investigated. Pure oxides, waste vanadium catalyst (containing 4.12% V2O5) and manganese carbonate ore concentrate containing  44.56% MnO have been used for preparation of the mixtures. The purpose of these investigations was to study phase transformations, some thermodynamic characteristics of waste products, containing Fe-Mn-V-Si-O and further producing real Fe-Mn-V alloys from this products. Two methods have been used to study these systems. Four mixtures were prepared for the investigation: mix 1 - pure oxides - V2O5, Fe2O3, SiO2; mix 2 - waste vanadium catalyst, Fe2O3; mix 3 - pure oxides - MnO2, Fe2O3, SiO2; mix 4 - manganese concentrate, Fe2O3. Phase transformations have been defined by DTA and X-ray analysis up to 1473K. The formation of new phases FeV2O4 and MnFe2O4 (Jacobsite) in the samples can be formed up to this temperature only if in the initial materials there is waste vanadium catalyst and manganese concentrate. In the temperature range 853K – 953K solid solution between Fe2О3 and Мn2О3 is formed (for pure oxides – mix3) and then it decomposes peritectically at 1203K. The oxygen potential, respectively Gibbs energy in the temperature range 1073К – 1173К has been calculated using EMF method with reference electrode Ni/NiO. Gibbs energy values for mix 1 and mix 2 are very close compared to the theoretical indications calculated for Fe2O3. Gibbs energy for mix 3 is in compliance with the data of manganese oxide.},
 year = {2014}
}

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TY  - JOUR
T1  - Phase Transformations and Thermodynamics of Binary Systems Fe2О3 - V2O5 and Fe2О3 - MnO at High Temperatures
AU  - Rossitza Paunova
AU  - Radost Alexandrova
AU  - Maksim Marinov
Y1  - 2014/03/20
PY  - 2014
N1  - https://doi.org/10.11648/j.ijmsa.20140302.17
DO  - 10.11648/j.ijmsa.20140302.17
T2  - International Journal of Materials Science and Applications
JF  - International Journal of Materials Science and Applications
JO  - International Journal of Materials Science and Applications
SP  - 49
EP  - 57
PB  - Science Publishing Group
SN  - 2327-2643
UR  - https://doi.org/10.11648/j.ijmsa.20140302.17
AB  - The phase transformations and thermodynamics of the binary systems of Fe2O3-MnO2 as well as Fe2O3-V2O5 have been investigated. Pure oxides, waste vanadium catalyst (containing 4.12% V2O5) and manganese carbonate ore concentrate containing  44.56% MnO have been used for preparation of the mixtures. The purpose of these investigations was to study phase transformations, some thermodynamic characteristics of waste products, containing Fe-Mn-V-Si-O and further producing real Fe-Mn-V alloys from this products. Two methods have been used to study these systems. Four mixtures were prepared for the investigation: mix 1 - pure oxides - V2O5, Fe2O3, SiO2; mix 2 - waste vanadium catalyst, Fe2O3; mix 3 - pure oxides - MnO2, Fe2O3, SiO2; mix 4 - manganese concentrate, Fe2O3. Phase transformations have been defined by DTA and X-ray analysis up to 1473K. The formation of new phases FeV2O4 and MnFe2O4 (Jacobsite) in the samples can be formed up to this temperature only if in the initial materials there is waste vanadium catalyst and manganese concentrate. In the temperature range 853K – 953K solid solution between Fe2О3 and Мn2О3 is formed (for pure oxides – mix3) and then it decomposes peritectically at 1203K. The oxygen potential, respectively Gibbs energy in the temperature range 1073К – 1173К has been calculated using EMF method with reference electrode Ni/NiO. Gibbs energy values for mix 1 and mix 2 are very close compared to the theoretical indications calculated for Fe2O3. Gibbs energy for mix 3 is in compliance with the data of manganese oxide.
VL  - 3
IS  - 2
ER  -

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Author Information

Rossitza Paunova

Department of Ferrous Metallurgy and Metal Foundry, University of Chemical Technology and Metallurgy, Sofia, Bulgaria
Radost Alexandrova

Department of Ferrous Metallurgy and Metal Foundry, University of Chemical Technology and Metallurgy, Sofia, Bulgaria
Maksim Marinov

Department of Ferrous Metallurgy and Metal Foundry, University of Chemical Technology and Metallurgy, Sofia, Bulgaria

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APA Style

Rossitza Paunova, Radost Alexandrova, Maksim Marinov. (2014). Phase Transformations and Thermodynamics of Binary Systems Fe2О3 - V2O5 and Fe2О3 - MnO at High Temperatures. International Journal of Materials Science and Applications, 3(2), 49-57. https://doi.org/10.11648/j.ijmsa.20140302.17

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ACS Style

Rossitza Paunova; Radost Alexandrova; Maksim Marinov. Phase Transformations and Thermodynamics of Binary Systems Fe2О3 - V2O5 and Fe2О3 - MnO at High Temperatures. Int. J. Mater. Sci. Appl. 2014, 3(2), 49-57. doi: 10.11648/j.ijmsa.20140302.17

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AMA Style

Rossitza Paunova, Radost Alexandrova, Maksim Marinov. Phase Transformations and Thermodynamics of Binary Systems Fe2О3 - V2O5 and Fe2О3 - MnO at High Temperatures. Int J Mater Sci Appl. 2014;3(2):49-57. doi: 10.11648/j.ijmsa.20140302.17

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@article{10.11648/j.ijmsa.20140302.17,
  author = {Rossitza Paunova and Radost Alexandrova and Maksim Marinov},
  title = {Phase Transformations and Thermodynamics of Binary Systems Fe2О3 - V2O5 and Fe2О3 - MnO at High Temperatures},
  journal = {International Journal of Materials Science and Applications},
  volume = {3},
  number = {2},
  pages = {49-57},
  doi = {10.11648/j.ijmsa.20140302.17},
  url = {https://doi.org/10.11648/j.ijmsa.20140302.17},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmsa.20140302.17},
  abstract = {The phase transformations and thermodynamics of the binary systems of Fe2O3-MnO2 as well as Fe2O3-V2O5 have been investigated. Pure oxides, waste vanadium catalyst (containing 4.12% V2O5) and manganese carbonate ore concentrate containing  44.56% MnO have been used for preparation of the mixtures. The purpose of these investigations was to study phase transformations, some thermodynamic characteristics of waste products, containing Fe-Mn-V-Si-O and further producing real Fe-Mn-V alloys from this products. Two methods have been used to study these systems. Four mixtures were prepared for the investigation: mix 1 - pure oxides - V2O5, Fe2O3, SiO2; mix 2 - waste vanadium catalyst, Fe2O3; mix 3 - pure oxides - MnO2, Fe2O3, SiO2; mix 4 - manganese concentrate, Fe2O3. Phase transformations have been defined by DTA and X-ray analysis up to 1473K. The formation of new phases FeV2O4 and MnFe2O4 (Jacobsite) in the samples can be formed up to this temperature only if in the initial materials there is waste vanadium catalyst and manganese concentrate. In the temperature range 853K – 953K solid solution between Fe2О3 and Мn2О3 is formed (for pure oxides – mix3) and then it decomposes peritectically at 1203K. The oxygen potential, respectively Gibbs energy in the temperature range 1073К – 1173К has been calculated using EMF method with reference electrode Ni/NiO. Gibbs energy values for mix 1 and mix 2 are very close compared to the theoretical indications calculated for Fe2O3. Gibbs energy for mix 3 is in compliance with the data of manganese oxide.},
 year = {2014}
}

Copy | Download

TY  - JOUR
T1  - Phase Transformations and Thermodynamics of Binary Systems Fe2О3 - V2O5 and Fe2О3 - MnO at High Temperatures
AU  - Rossitza Paunova
AU  - Radost Alexandrova
AU  - Maksim Marinov
Y1  - 2014/03/20
PY  - 2014
N1  - https://doi.org/10.11648/j.ijmsa.20140302.17
DO  - 10.11648/j.ijmsa.20140302.17
T2  - International Journal of Materials Science and Applications
JF  - International Journal of Materials Science and Applications
JO  - International Journal of Materials Science and Applications
SP  - 49
EP  - 57
PB  - Science Publishing Group
SN  - 2327-2643
UR  - https://doi.org/10.11648/j.ijmsa.20140302.17
AB  - The phase transformations and thermodynamics of the binary systems of Fe2O3-MnO2 as well as Fe2O3-V2O5 have been investigated. Pure oxides, waste vanadium catalyst (containing 4.12% V2O5) and manganese carbonate ore concentrate containing  44.56% MnO have been used for preparation of the mixtures. The purpose of these investigations was to study phase transformations, some thermodynamic characteristics of waste products, containing Fe-Mn-V-Si-O and further producing real Fe-Mn-V alloys from this products. Two methods have been used to study these systems. Four mixtures were prepared for the investigation: mix 1 - pure oxides - V2O5, Fe2O3, SiO2; mix 2 - waste vanadium catalyst, Fe2O3; mix 3 - pure oxides - MnO2, Fe2O3, SiO2; mix 4 - manganese concentrate, Fe2O3. Phase transformations have been defined by DTA and X-ray analysis up to 1473K. The formation of new phases FeV2O4 and MnFe2O4 (Jacobsite) in the samples can be formed up to this temperature only if in the initial materials there is waste vanadium catalyst and manganese concentrate. In the temperature range 853K – 953K solid solution between Fe2О3 and Мn2О3 is formed (for pure oxides – mix3) and then it decomposes peritectically at 1203K. The oxygen potential, respectively Gibbs energy in the temperature range 1073К – 1173К has been calculated using EMF method with reference electrode Ni/NiO. Gibbs energy values for mix 1 and mix 2 are very close compared to the theoretical indications calculated for Fe2O3. Gibbs energy for mix 3 is in compliance with the data of manganese oxide.
VL  - 3
IS  - 2
ER  -

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