Formation and decomposition of tetrafluoroborate ions in the presence of aluminum

Junya Katagiri, Siqingaowa Borjigin, Toshiaki Yoshioka, Tadaaki Mizoguchi

研究成果: Article査読

8 被引用数 (Scopus)

抄録

The formation and decomposition of tetrafluoroborate ions (BF4-) in H3BO3-Al3+-F- solutions were investigated via experiments and thermodynamic calculations. The concentration of the formed BF4- increased with decreasing pH, raising the total fluoride concentration and lowering the total aluminum ion concentration. Once formed, BF4- was stable under neutral and alkaline conditions. Fluoride in the form of BF4- was converted to fluoroaluminate ions by adding an aluminum compound under acidic conditions. A method for removing fluoride in the form of BF4- is proposed whereby fluoroaluminate ions formed by the reaction of BF4- with aluminum are decomposed with calcium ions. This process was applied to the treatment of wastewater from flue gas desulfurization plants, and resulted in a satisfying level of reduction in the range of the fluoride emission limit of 8 mg/l.

本文言語English
ページ(範囲)136-146
ページ数11
ジャーナルJournal of Material Cycles and Waste Management
12
2
DOI
出版ステータスPublished - 2010 7 14

ASJC Scopus subject areas

  • 廃棄物管理と処理
  • 材料力学

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