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: Contribution to journalArticle査読

3 被引用数 (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.

本文言語英語
ページ(範囲)281-284
ページ数4
ジャーナルResource Geology
55
3
DOI
出版ステータス出版済み - 2005

All Science Journal Classification (ASJC) codes

  • 地質学
  • 地球化学および岩石学

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