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Effect of Dissolved Silica on Immobilization of Boron by Magnesium Oxide

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Title: Effect of Dissolved Silica on Immobilization of Boron by Magnesium Oxide
Authors: Nozawa, Shoko Browse this author
Sato, Tsutomu Browse this author →KAKEN DB
Otake, Tsubasa Browse this author
Keywords: immobilization
magnesium oxide
magnesium silicate hydrates (M-S-H)
Issue Date: 24-Feb-2018
Publisher: MDPI
Journal Title: Minerals
Volume: 8
Issue: 2
Start Page: 76
Publisher DOI: 10.3390/min8020076
Abstract: The effect of silica on the immobilization reaction of boron by magnesium oxide was investigated by laboratory experiments. In the absence of silica, due to dissolution of the magnesium oxide, boron was removed from solutions by the precipitation of multiple magnesium borates. In the presence of silica, magnesium silica hydrate (M-S-H) was formed as a secondary mineral, which takes up boron. Here B-11 magic-angle spinning nuclear magnetic resonance (MAS-NMR) and Fourier transform infrared spectrometer (FT-IR) data show that a part of the boron would be incorporated into M-S-H structures by isomorphic substitution of silicon. Another experiment where magnesium oxide and amorphous silica were reacted beforehand and boron was added later showed that the shorter the reaction time of the preceding reaction, the higher the sorption ratio of boron. That is, boron was incorporated into the M-S-H mainly by coprecipitation. The experiments in the study here show that the sorption of boron in the presence of silica is mainly due to the incorporation of boron during the formation of the M-S-H structure, which suggests that boron would not readily leach out, and that stable immobilization of boron can be expected.
Rights: © 2018 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution License (
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 佐藤 努

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