Reduction and separation of silica-alumina mixture with argon-hydrogen thermal plasmas

Takayuki Watanabe; Makoto Soyama; Atsushi Kanzawa; Akihiro Takeuchi; Mamoru Koike

doi:10.1016/S0040-6090(99)00071-1

Reduction and separation of silica-alumina mixture with argon-hydrogen thermal plasmas

Takayuki Watanabe, Makoto Soyama, Atsushi Kanzawa, Akihiro Takeuchi, Mamoru Koike

Research output: Contribution to journal › Conference article › peer-review

16 Citations (Scopus)

Abstract

Thermal plasma reduction of a SiO₂-Al₂O₃ mixture for metal production was investigated. The understanding of the reaction mechanism would be applied to metal recovery from coal ash. Thermal equilibrium and free energy of formation of the reaction systems were estimated to predict the evaporated species and to evaluate the predominant reactions. Atomic hydrogen plays an important role in the reduction of the SiO₂-Al₂O₃ mixture. Argon and argon-hydrogen plasma jets were used for the treatment of the SiO₂-Al₂O₃ mixture with various compositions. The argon plasma produces gaseous silicon and SiO from the SiO₂-Al₂O₃ mixture, though the recovered amount was very little, while Al₂O₃ has not been reduced. The argon-hydrogen plasma produces mainly gaseous silicon with some additions of gaseous SiO and aluminum. Both of the argon and the argon-hydrogen plasmas produce the silicon component collected as the fumes having the purity of 98-99% from the SiO₂-Al₂O₃ mixture.

Original language	English
Pages (from-to)	161-166
Number of pages	6
Journal	Thin Solid Films
Volume	345
Issue number	1
DOIs	https://doi.org/10.1016/S0040-6090(99)00071-1
Publication status	Published - May 7 1999
Externally published	Yes
Event	Proceedings of the 1998 11th Symposium on Plasma Science for Materials (SPSM-11) / 4th Asia-Pacific Conference on Plasma Science and Technology (APCPST-4) - Sydney, NSW, Aust Duration: Jul 27 1998 → Jul 29 1998

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Surfaces and Interfaces
Surfaces, Coatings and Films
Metals and Alloys
Materials Chemistry

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10.1016/S0040-6090(99)00071-1

Cite this

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title = "Reduction and separation of silica-alumina mixture with argon-hydrogen thermal plasmas",

abstract = "Thermal plasma reduction of a SiO2-Al2O3 mixture for metal production was investigated. The understanding of the reaction mechanism would be applied to metal recovery from coal ash. Thermal equilibrium and free energy of formation of the reaction systems were estimated to predict the evaporated species and to evaluate the predominant reactions. Atomic hydrogen plays an important role in the reduction of the SiO2-Al2O3 mixture. Argon and argon-hydrogen plasma jets were used for the treatment of the SiO2-Al2O3 mixture with various compositions. The argon plasma produces gaseous silicon and SiO from the SiO2-Al2O3 mixture, though the recovered amount was very little, while Al2O3 has not been reduced. The argon-hydrogen plasma produces mainly gaseous silicon with some additions of gaseous SiO and aluminum. Both of the argon and the argon-hydrogen plasmas produce the silicon component collected as the fumes having the purity of 98-99% from the SiO2-Al2O3 mixture.",

author = "Takayuki Watanabe and Makoto Soyama and Atsushi Kanzawa and Akihiro Takeuchi and Mamoru Koike",

year = "1999",

month = may,

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doi = "10.1016/S0040-6090(99)00071-1",

language = "English",

volume = "345",

pages = "161--166",

journal = "Thin Solid Films",

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number = "1",

note = "Proceedings of the 1998 11th Symposium on Plasma Science for Materials (SPSM-11) / 4th Asia-Pacific Conference on Plasma Science and Technology (APCPST-4) ; Conference date: 27-07-1998 Through 29-07-1998",

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TY - JOUR

T1 - Reduction and separation of silica-alumina mixture with argon-hydrogen thermal plasmas

AU - Watanabe, Takayuki

AU - Soyama, Makoto

AU - Kanzawa, Atsushi

AU - Takeuchi, Akihiro

AU - Koike, Mamoru

PY - 1999/5/7

Y1 - 1999/5/7

N2 - Thermal plasma reduction of a SiO2-Al2O3 mixture for metal production was investigated. The understanding of the reaction mechanism would be applied to metal recovery from coal ash. Thermal equilibrium and free energy of formation of the reaction systems were estimated to predict the evaporated species and to evaluate the predominant reactions. Atomic hydrogen plays an important role in the reduction of the SiO2-Al2O3 mixture. Argon and argon-hydrogen plasma jets were used for the treatment of the SiO2-Al2O3 mixture with various compositions. The argon plasma produces gaseous silicon and SiO from the SiO2-Al2O3 mixture, though the recovered amount was very little, while Al2O3 has not been reduced. The argon-hydrogen plasma produces mainly gaseous silicon with some additions of gaseous SiO and aluminum. Both of the argon and the argon-hydrogen plasmas produce the silicon component collected as the fumes having the purity of 98-99% from the SiO2-Al2O3 mixture.

AB - Thermal plasma reduction of a SiO2-Al2O3 mixture for metal production was investigated. The understanding of the reaction mechanism would be applied to metal recovery from coal ash. Thermal equilibrium and free energy of formation of the reaction systems were estimated to predict the evaporated species and to evaluate the predominant reactions. Atomic hydrogen plays an important role in the reduction of the SiO2-Al2O3 mixture. Argon and argon-hydrogen plasma jets were used for the treatment of the SiO2-Al2O3 mixture with various compositions. The argon plasma produces gaseous silicon and SiO from the SiO2-Al2O3 mixture, though the recovered amount was very little, while Al2O3 has not been reduced. The argon-hydrogen plasma produces mainly gaseous silicon with some additions of gaseous SiO and aluminum. Both of the argon and the argon-hydrogen plasmas produce the silicon component collected as the fumes having the purity of 98-99% from the SiO2-Al2O3 mixture.

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DO - 10.1016/S0040-6090(99)00071-1

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AN - SCOPUS:0033531804

SN - 0040-6090

VL - 345

SP - 161

EP - 166

JO - Thin Solid Films

JF - Thin Solid Films

IS - 1

T2 - Proceedings of the 1998 11th Symposium on Plasma Science for Materials (SPSM-11) / 4th Asia-Pacific Conference on Plasma Science and Technology (APCPST-4)

Y2 - 27 July 1998 through 29 July 1998

ER -

Reduction and separation of silica-alumina mixture with argon-hydrogen thermal plasmas

Abstract

All Science Journal Classification (ASJC) codes

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