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

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

研究成果: ジャーナルへの寄稿Conference article

14 引用 (Scopus)

抄録

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.

元の言語英語
ページ(範囲)161-166
ページ数6
ジャーナルThin Solid Films
345
発行部数1
DOI
出版物ステータス出版済み - 5 7 1999
イベント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
継続期間: 7 27 19987 29 1998

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Plasma Gases
Aluminum Oxide
Argon
thermal plasmas
hydrogen plasma
Silicon Dioxide
argon plasma
Hydrogen
Alumina
aluminum oxides
Silica
argon
silicon dioxide
Plasmas
Silicon
silicon
fumes
Coal Ash
Metal recovery
energy of formation

All Science Journal Classification (ASJC) codes

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

これを引用

Reduction and separation of silica-alumina mixture with argon-hydrogen thermal plasmas. / Watanabe, Takayuki; Soyama, Makoto; Kanzawa, Atsushi; Takeuchi, Akihiro; Koike, Mamoru.

:: Thin Solid Films, 巻 345, 番号 1, 07.05.1999, p. 161-166.

研究成果: ジャーナルへの寄稿Conference article

Watanabe, Takayuki ; Soyama, Makoto ; Kanzawa, Atsushi ; Takeuchi, Akihiro ; Koike, Mamoru. / Reduction and separation of silica-alumina mixture with argon-hydrogen thermal plasmas. :: Thin Solid Films. 1999 ; 巻 345, 番号 1. pp. 161-166.
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AU - Koike, Mamoru

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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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