A study on the formation of smectite in silica scales precipitated from geothermal water: The effect of magnesium

Yoshinobu Aramaki, Takushi Yokoyama, Yoshihiro Okaue, Akira Imai, Koichiro Watanabe

研究成果: ジャーナルへの寄稿記事

3 引用 (Scopus)

抄録

Silica scales containing large amounts of smectite were recently found in the pipelines for geothermal water at a geothermal power plant. To elucidate the mechanism of smectite formation, seven silica scale samples were characterized by powder X-ray diffraction, chemical analysis and 27Al MAS NMR. Smectite was present in samples with MgO levels above 10 wt% and Al2O3 levels below 10 wt%. In 27Al MAS NMR spectra, peaks assigned to both tetrahedrally and octahedrally coordinated aluminum (Al(4) and Al(6)) were observed for Mg-rich samples, whereas a peak due to Al(4) alone appeared in Mg-poor samples. From these observation and comparison between 27Al MAS NMR spectra for synthesized precipitates of Al2O3-SiO2 containing MgO and not containing MgO, it is concluded that magnesium plays an important role in the stabilization of Al(6), and results in the formation of smectite.

元の言語英語
ページ(範囲)281-284
ページ数4
ジャーナルResource Geology
55
発行部数3
DOI
出版物ステータス出版済み - 1 1 2005

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Silicon Dioxide
smectite
Magnesium
MAS
magnesium
silica
nuclear magnetic resonance
Water
Nuclear magnetic resonance
Geothermal power plants
water
geothermal power
Aluminum
X ray powder diffraction
chemical analysis
Precipitates
power plant
stabilization
Stabilization
Pipelines

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

これを引用

A study on the formation of smectite in silica scales precipitated from geothermal water : The effect of magnesium. / Aramaki, Yoshinobu; Yokoyama, Takushi; Okaue, Yoshihiro; Imai, Akira; Watanabe, Koichiro.

:: Resource Geology, 巻 55, 番号 3, 01.01.2005, p. 281-284.

研究成果: ジャーナルへの寄稿記事

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abstract = "Silica scales containing large amounts of smectite were recently found in the pipelines for geothermal water at a geothermal power plant. To elucidate the mechanism of smectite formation, seven silica scale samples were characterized by powder X-ray diffraction, chemical analysis and 27Al MAS NMR. Smectite was present in samples with MgO levels above 10 wt{\%} and Al2O3 levels below 10 wt{\%}. In 27Al MAS NMR spectra, peaks assigned to both tetrahedrally and octahedrally coordinated aluminum (Al(4) and Al(6)) were observed for Mg-rich samples, whereas a peak due to Al(4) alone appeared in Mg-poor samples. From these observation and comparison between 27Al MAS NMR spectra for synthesized precipitates of Al2O3-SiO2 containing MgO and not containing MgO, it is concluded that magnesium plays an important role in the stabilization of Al(6), and results in the formation of smectite.",
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AU - Aramaki, Yoshinobu

AU - Yokoyama, Takushi

AU - Okaue, Yoshihiro

AU - Imai, Akira

AU - Watanabe, Koichiro

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N2 - Silica scales containing large amounts of smectite were recently found in the pipelines for geothermal water at a geothermal power plant. To elucidate the mechanism of smectite formation, seven silica scale samples were characterized by powder X-ray diffraction, chemical analysis and 27Al MAS NMR. Smectite was present in samples with MgO levels above 10 wt% and Al2O3 levels below 10 wt%. In 27Al MAS NMR spectra, peaks assigned to both tetrahedrally and octahedrally coordinated aluminum (Al(4) and Al(6)) were observed for Mg-rich samples, whereas a peak due to Al(4) alone appeared in Mg-poor samples. From these observation and comparison between 27Al MAS NMR spectra for synthesized precipitates of Al2O3-SiO2 containing MgO and not containing MgO, it is concluded that magnesium plays an important role in the stabilization of Al(6), and results in the formation of smectite.

AB - Silica scales containing large amounts of smectite were recently found in the pipelines for geothermal water at a geothermal power plant. To elucidate the mechanism of smectite formation, seven silica scale samples were characterized by powder X-ray diffraction, chemical analysis and 27Al MAS NMR. Smectite was present in samples with MgO levels above 10 wt% and Al2O3 levels below 10 wt%. In 27Al MAS NMR spectra, peaks assigned to both tetrahedrally and octahedrally coordinated aluminum (Al(4) and Al(6)) were observed for Mg-rich samples, whereas a peak due to Al(4) alone appeared in Mg-poor samples. From these observation and comparison between 27Al MAS NMR spectra for synthesized precipitates of Al2O3-SiO2 containing MgO and not containing MgO, it is concluded that magnesium plays an important role in the stabilization of Al(6), and results in the formation of smectite.

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