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Deepening of hydration chemistry of silicates by in-situ analysis under wet conditions

Research Project

Project/Area Number 19H02487
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 26060:Metals production and resources production-related
Research InstitutionTohoku University

Principal Investigator

Shibata Hiroyuki  東北大学, 多元物質科学研究所, 教授 (50250824)

Co-Investigator(Kenkyū-buntansha) 助永 壮平  東北大学, 多元物質科学研究所, 准教授 (20432859)
川西 咲子  東北大学, 多元物質科学研究所, 助教 (80726985)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2021: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2020: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Keywordsシリケート構造 / 重合度 / 溶出 / ケイ酸塩物質 / 蛍光イメージング / ケイ酸塩 / 水和 / カルシウム / ハイドレーション / その場分光 / 核磁気共鳴 / その場分光解析 / 核磁気共鳴法 / ラマン分光法
Outline of Research at the Start

ケイ酸塩を骨格構造として持つ鉱物、ガラス、スラグは多方面で利用されるが、化学耐久性や反応性への多様化するニーズに応えるためには、水和および溶出挙動の理解が必要である。そこで本研究ではケイ酸塩物質の水和反応と、それに伴う構成元素の溶出メカニズムを解明する。核磁気共鳴法およびラマン分光法を、湿潤下でのその場分光手法として発展・融合させ、水和反応に伴う変質層の形成過程に迫り、ハイドレーション・ケミストリーを構築する。変質層の安定性の観点でケイ酸塩物質の化学耐久性を整理するとともに、材料設計指針を提言する。

Outline of Final Research Achievements

This research was performed with the aim of elucidating the elution mechanism of the constituent elements of silicate substances. Elution tests were conducted on a total of 15 types of samples in the CaO-SiO2 binary system and the ternary system in which MgO, FeO, CaF2 or Al2O3 was added to the binary system, and the samples were analyzed by various spectroscopic analyses. As a result, it was found that the silicate skeleton structure and network structure have a great influence on the Ca elution, which leads to an increase in pH. It was also clarified that the rate-determining step of Ca elution is the diffusion of Ca ions in the Ca-depleted layer near the surface. As described above, the elution behavior of the silicate substance into water was elucidated, and the effectiveness of the addition of the third component for suppressing the elution was shown.

Academic Significance and Societal Importance of the Research Achievements

国内外の溶出挙動に関する研究の多くは、スラグを想定した複合相を用いた溶出挙動の評価であるのに対し、本研究では高温合成により得られた鉱物単相を試料とした。これにより、シリケートの骨格構造やネットワーク構造とCaおよびSi溶出量との関係の解明や、添加成分の溶出抑制への有効性の理解に至った。ケイ酸塩物質の有効活用を実現するためには、利用環境下での化学耐久性や反応性への多様化するニーズに応える必要があり、本研究を通じて得られた基礎知見は材料設計への指針のひとつになりうる。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (13 results)

All 2022 2021 2020 2019 Other

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (8 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Remarks (2 results)

  • [Journal Article] Inhibitory Effect of MgO, FeO, CaF2, and Al2O3 Additives on the Dissolution Behavior of Ca from Silicate Mineral Phases into Water2021

    • Author(s)
      Ruan Fang、Kawanishi Sakiko、Sukenaga Sohei、Shibata Hiroyuki
    • Journal Title

      Metallurgical and Materials Transactions B

      Volume: 53 Issue: 1 Pages: 407-417

    • DOI

      10.1007/s11663-021-02376-3

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effect of the Silicate Skeleton Structure on the Dissolution Kinetics of Calcium Silicate Mineral Phases in Water2021

    • Author(s)
      Ruan Fang、Kawanishi Sakiko、Sukenaga Sohei、Shibata Hiroyuki
    • Journal Title

      Metallurgical and Materials Transactions B

      Volume: 52 Issue: 2 Pages: 1071-1084

    • DOI

      10.1007/s11663-021-02079-9

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effect of the Silicate Structure on Calcium Elution Behaviors of Calcium-silicate Based Mineral Phases in Aqueous Solution2020

    • Author(s)
      Ruan Fang、Kawanishi Sakiko、Sukenaga Sohei、Shibata Hiroyuki
    • Journal Title

      ISIJ International

      Volume: 60 Issue: 3 Pages: 419-425

    • DOI

      10.2355/isijinternational.ISIJINT-2019-263

    • NAID

      130007808508

    • ISSN
      0915-1559, 1347-5460
    • Year and Date
      2020-03-15
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Ca2+ and pH Imaging during Dissolution of CaSiO3 into Aqueous Solution2022

    • Author(s)
      Sakiko Kawanishi, Hinako Nakayama, Jun Kawano, Takeshi Yoshikawa, Hiroyuki Shibata
    • Organizer
      TMS 2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 蛍光イメージング法によるCaSiO3へのMgO添加によるCa2+溶出抑制のその場解析2022

    • Author(s)
      藤田真由、川西咲子、川野潤、助永壮平、柴田浩幸
    • Organizer
      日本鉄鋼協会 第183回春季講演大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Calcium Elution Mechanism from Silicate-Based Minerals into Water2021

    • Author(s)
      SHIBATA Hiroyuki, FANG Ruang, KAWANISHI Sakiko, SUKENAGA Sohei
    • Organizer
      2021 China Symposium on Sustainable Iron- and Steelmaking Technology
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 蛍光イメージングによるCaSiO3の水溶液への溶出挙動の可視化2020

    • Author(s)
      中山日菜子, 川西咲子, 川野潤, 柴田浩幸
    • Organizer
      日本鉄鋼協会, 第180回秋季講演大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Relationship between the Silicate Skeleton Structure and the Dissolution Kinetics of Calcium-Silicate Mineral Phases into Water2020

    • Author(s)
      Fang RUAN, Sakiko Kawanishi, Sohei Sukenaga, Hiroyuki Shibata
    • Organizer
      日本鉄鋼協会, 第180回秋季講演大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] The Preferential Dissolution Behavior of Calcium into Water from the Calcium-Silicate Mineral Phases2020

    • Author(s)
      Fang RUAN, Sakiko Kawanishi, Sohei Sukenaga, Hiroyuki Shibata
    • Organizer
      日本鉄鋼協会, 第179回春季講演大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] カルシウムシリケート系鉱物の水へのCa溶出挙動に及ぼす結晶構造の影響2019

    • Author(s)
      川西咲子, Ruan Fang, 柴田浩幸
    • Organizer
      日本鉄鋼協会, 第178回秋季講演大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Observation of Surface during Dissolution of Calcium-Silicate Mineral Phases into Water2019

    • Author(s)
      Fang RUAN, Sakiko Kawanishi, Sohei Sukenaga, Hiroyuki Shibata
    • Organizer
      日本鉄鋼協会, 第178回秋季講演大会
    • Related Report
      2019 Annual Research Report
  • [Remarks] [論文] ケイ酸塩鉱物の水への溶出挙動

    • URL

      http://www2.tagen.tohoku.ac.jp/lab/shibata/news/535/

    • Related Report
      2021 Annual Research Report
  • [Remarks] [受賞] 日本鉄鋼協会第180回秋季講演大会ポスター発表奨励賞/中山日菜子

    • URL

      http://www2.tagen.tohoku.ac.jp/lab/shibata/news/315/

    • Related Report
      2020 Annual Research Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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