• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Development of pollution-free fining agent ; mechanism of fining reaction and redox eqilibrium

Research Project

Project/Area Number 13450357
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 無機工業化学
Research InstitutionEhime University

Principal Investigator

MAEKAWA Takashi  Ehime University, Faculty of Engineering, Professor, 工学部, 教授 (50000873)

Co-Investigator(Kenkyū-buntansha) YAMASHITA Hiroshi  Ehime University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (00182501)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥14,400,000 (Direct Cost: ¥14,400,000)
Fiscal Year 2002: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥10,800,000 (Direct Cost: ¥10,800,000)
KeywordsGlass melts / Differential pulse voltammetry / Half-wave potential / Redox equilibrium / Multivalent metal ion / Non-alkali glass / Fining / 高温融体 / 溶解酸素ガス / 清澄剤 / 亡硝 / 急冷ガラス
Research Abstract

1. Voltammetric Studies of Glass Melts
The differential pulse voltammetry was applied to investigate the Redox reaction of Fe, Sn, Ce and S ion in soda lime, phosphate, and non-alkali glass melts. Halfwave potential was computed from the peak position of current-potential curves, and discussed in relation with temperature and melt composition. It was seen that the concentration of reduced ions increases with an increase in temperature. In case of Fe ion in soda lime melt, it turns out that the Fe^<2+>/Fe^<3+> equilibrium is governed by the complex formation reaction Fe^<3+> ion and basicity of the melt. The equilibrium of Sn ion in nonalkali glass melt can be discussed by adding the amount of Na^+ ion in the melts and extrapolating the half wave potential to that of zero concentration of Na^+ ion.
2. The Spectroscopy of Glasses -- NMR study
By peak separation of ^<11>B, ^<27>Al and ^<29>Si NMR spectra of non-alkali glass(MO(M_2O)-SiO_2-Al_2O_3-B_2O_3), reactivity of alkali or alkaline earth oxides with SiO_2, Al_2O_3 and B_2O_3 was determined. The reactivity with B_2O_3 increase in order of K_2O>Na_2O>BaO>SrO>CaO>PbO>MgO>ZnO. The equilibrium constant, K, of the following reaction is applied to elucidate the experimental results. Si(Q_3)+B(Q_3)=Si(Q_4)+and B(Q_4) : K=[Si(Q_4)] [B(Q_4)] / [Si(Q_3)] [B(Q_3)]
3. Fining
The temperature dependence of Redox reaction of fining ions is important forclarifyingthe fining process. In the case of metal ion, it was important that [Ox]/[Red] concentration ratio is about unity in glass melting temperature, and it wasexpected that Sn ion is suitable for fining ion in non-alkali glass melts. In case of sulfur, irreversible decomposition of sodium sulphate contributes to fining process.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Taro Asahi: "Preparation and optical properties of ZnS-microcrystals deposited in silica gels"Ceramics International. 27. 39-43 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 朝日太郎: "硫黄含有アルカリホウ酸塩ガラスの着色と硫黄の存在状態"J. Ceram. Soc. Jpn.. 110. 576-582 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Taro Asahi, Hiroshi Yamashita, Takashi Maekawa: "Preparation and optical properties of ZnS-microcrystals deposited in silica gels"Ceramics International. 27. 39-43 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Taro Asahi, Yoshinari Miura, Hiroshi Yamashita, Takashi maekawa: "Coloration and chemical bonding state of sulfur in R_2S-B_2O_3(R=Li, Na, K) glasses"J.Ceram.Soc.Jpn.. 110-6. 576-582 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Taro Asahi: "Preparation and optical properties of ZnS-microcrystals deposited in silica gels"Ceramics International. 27. 39-43 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] 朝日太郎: "硫黄含有アルカリホウ酸塩ガラスの着色と硫黄の存在状態"J.Ceram.Soc.Jpn. 110・6. 576-582 (2002)

    • Related Report
      2002 Annual Research Report

URL: 

Published: 2001-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi