Gas Generation Reactions during TiO₂ Reduction Using Molten Salt

• Haraguchi Yasushi

  Faculty of Engineering, Hokkaido University

• Shibuya Ryota

  Faculty of Engineering, Hokkaido University

• Natsui Shungo

  Faculty of Engineering, Hokkaido University

• Kikuchi Tatsuya

  Faculty of Engineering, Hokkaido University

• O. Suzuki Ryosuke

  Faculty of Engineering, Hokkaido University

Bibliographic Information

Other Title

• TiO₂溶融塩電解還元時のガス発生反応
• TiO₂溶融塩電解還元時のガス発生反応
• TiO ₂ ヨウユウエン デンカイ カンゲンジ ノ ガス ハッセイ ハンノウ

Abstract

Titanium dioxides were reduced to metallic titanium via molten salt electrolysis using CaCl₂. It was reported that the efficiency was low because some side reactions produced carbon precipitates. To produce titanium more efficiently, these electrochemical side reactions were examined by cyclic voltammetry (CV). O^2- reacted with the carbon anode to form CO and CO₂ gas bubbles, which easily dissolved into the molten salt and formed CO₃^2-, subsequently generating carbon powder. CV was performed after interrupting electrolysis temporarily. The electrochemical reduction of CO₃^2- in the cathodic scan was not observed, suggesting that CO₃^2- was spontaneously reduced by Ca during electrolysis. Anodic reactions preceding Cl₂ gas generation occurred in three steps: CO and CO₂ gas generation related to O^2-, and successive CO₂ generation related to CO₃^2-.

Journal

• Journal of the Japan Institute of Metals and Materials

  Journal of the Japan Institute of Metals and Materials 83 (11), 441-448, 2019-11-01

  The Japan Institute of Metals and Materials

Keywords

• molten salt
• calcium chloride
• titanium dioxide
• cyclic voltammetry
• carbonate ion
• gas evolution

Details

• CRID: 1390845702304068992
• NII Article ID: 130007732599
• NII Book ID: AN00062446
• DOI: 10.2320/jinstmet.jaw201901
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• HANDLE: 2115/76008
• NDL BIB ID: 030075490
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I030075490
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet/83/11/83_JAW201901/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • IRDB
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed