Inhibition of conversion process from Fe(OH)3 to β-FeOOH and α-Fe2O3 by the addition of silicate ions

Sang Koo Kwon; Ken'ichi Kimijima; Kiyoshi Kanie; Atsushi Muramatsu; Shigeru Suzuki; Eiichiro Matsubara; Yoshio Waseda

doi:10.2355/isijinternational.45.77

Inhibition of conversion process from Fe(OH)₃ to β-FeOOH and α-Fe₂O₃ by the addition of silicate ions

Sang Koo Kwon, Ken'ichi Kimijima, Kiyoshi Kanie, Atsushi Muramatsu, Shigeru Suzuki, Eiichiro Matsubara, Yoshio Waseda

Tohoku University

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

To examine the influence of silicate ions on a conversion process of condensed ferric hydroxide (Fe(OH)₃) gel to ferric oxyhydroxides and iron oxides, the Fe(OH)₃ gel was aged at 60°C in the presence and absence of silicate ions. Fine particles and supernatant solution were sampled from the aged suspensions containing colloidal particles. Powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) have been used for characterizing the resulting solid particles. XRD profiles and TEM micrographs showed that the Fe(OH)₃ gel transferred into β-FeOOH and α-Fe₂O₃ particles by aging in the absence of silicate ions. On the other hand, silicate ions suppressed the conversion of the Fe(OH)₃ gel to β-FeOOH and α-Fe₂O₃ particles. The conversion of the Fe(OH)₃ gel to α-Fe ₂O₃ particles is almost independent of pH of solution under the conditions in the present study, indicating that silicate ions essentially suppress the formation of β-FeOOH and α-Fe ₂O₃ particles.

Original language	English
Pages (from-to)	77-81
Number of pages	5
Journal	ISIJ International
Volume	45
Issue number	1
DOIs	https://doi.org/10.2355/isijinternational.45.77
Publication status	Published - 2005

Keywords

Akaganeite
Ferric oxyhydroxide
Fine particle
Gel
Hematite
Silicate ion

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10.2355/isijinternational.45.77

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title = "Inhibition of conversion process from Fe(OH)3 to β-FeOOH and α-Fe2O3 by the addition of silicate ions",

abstract = "To examine the influence of silicate ions on a conversion process of condensed ferric hydroxide (Fe(OH)3) gel to ferric oxyhydroxides and iron oxides, the Fe(OH)3 gel was aged at 60°C in the presence and absence of silicate ions. Fine particles and supernatant solution were sampled from the aged suspensions containing colloidal particles. Powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) have been used for characterizing the resulting solid particles. XRD profiles and TEM micrographs showed that the Fe(OH)3 gel transferred into β-FeOOH and α-Fe2O3 particles by aging in the absence of silicate ions. On the other hand, silicate ions suppressed the conversion of the Fe(OH)3 gel to β-FeOOH and α-Fe2O3 particles. The conversion of the Fe(OH)3 gel to α-Fe 2O3 particles is almost independent of pH of solution under the conditions in the present study, indicating that silicate ions essentially suppress the formation of β-FeOOH and α-Fe 2O3 particles.",

keywords = "Akaganeite, Ferric oxyhydroxide, Fine particle, Gel, Hematite, Silicate ion",

author = "Kwon, {Sang Koo} and Ken'ichi Kimijima and Kiyoshi Kanie and Atsushi Muramatsu and Shigeru Suzuki and Eiichiro Matsubara and Yoshio Waseda",

year = "2005",

doi = "10.2355/isijinternational.45.77",

language = "English",

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pages = "77--81",

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T1 - Inhibition of conversion process from Fe(OH)3 to β-FeOOH and α-Fe2O3 by the addition of silicate ions

AU - Kwon, Sang Koo

AU - Kimijima, Ken'ichi

AU - Kanie, Kiyoshi

AU - Muramatsu, Atsushi

AU - Suzuki, Shigeru

AU - Matsubara, Eiichiro

AU - Waseda, Yoshio

PY - 2005

Y1 - 2005

N2 - To examine the influence of silicate ions on a conversion process of condensed ferric hydroxide (Fe(OH)3) gel to ferric oxyhydroxides and iron oxides, the Fe(OH)3 gel was aged at 60°C in the presence and absence of silicate ions. Fine particles and supernatant solution were sampled from the aged suspensions containing colloidal particles. Powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) have been used for characterizing the resulting solid particles. XRD profiles and TEM micrographs showed that the Fe(OH)3 gel transferred into β-FeOOH and α-Fe2O3 particles by aging in the absence of silicate ions. On the other hand, silicate ions suppressed the conversion of the Fe(OH)3 gel to β-FeOOH and α-Fe2O3 particles. The conversion of the Fe(OH)3 gel to α-Fe 2O3 particles is almost independent of pH of solution under the conditions in the present study, indicating that silicate ions essentially suppress the formation of β-FeOOH and α-Fe 2O3 particles.

AB - To examine the influence of silicate ions on a conversion process of condensed ferric hydroxide (Fe(OH)3) gel to ferric oxyhydroxides and iron oxides, the Fe(OH)3 gel was aged at 60°C in the presence and absence of silicate ions. Fine particles and supernatant solution were sampled from the aged suspensions containing colloidal particles. Powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) have been used for characterizing the resulting solid particles. XRD profiles and TEM micrographs showed that the Fe(OH)3 gel transferred into β-FeOOH and α-Fe2O3 particles by aging in the absence of silicate ions. On the other hand, silicate ions suppressed the conversion of the Fe(OH)3 gel to β-FeOOH and α-Fe2O3 particles. The conversion of the Fe(OH)3 gel to α-Fe 2O3 particles is almost independent of pH of solution under the conditions in the present study, indicating that silicate ions essentially suppress the formation of β-FeOOH and α-Fe 2O3 particles.

KW - Akaganeite

KW - Ferric oxyhydroxide

KW - Fine particle

KW - Gel

KW - Hematite

KW - Silicate ion

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Inhibition of conversion process from Fe(OH)₃ to β-FeOOH and α-Fe₂O₃ by the addition of silicate ions

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