Formation and decomposition of tetrafluoroborate ions in the presence of aluminum

被引：11

作者：

Katagiri, Junya ^{[2
]}

Borjigin, Siqingaowa ^{[1
]}

Yoshioka, Toshiaki ^{[1
]}

Mizoguchi, Tadaaki ^{[2
]}

机构：

[1] Tohoku Univ, Grad Sch Environm Studies, Aoba Ku, Sendai, Miyagi 9808579, Japan

[2] Tohoku Univ, Environm Conservat Res Inst, Sendai, Miyagi 9808579, Japan

来源：

JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT | 2010年 / 12卷 / 02期

关键词：

Tetrafluoroborate ion; Boron; Fluoride; Aluminum; Formation; Decomposition; PARTITIONING BEHAVIOR; COMBUSTION; COAL; ELEMENTS; ACID;

D O I：

10.1007/s10163-009-0281-1

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The formation and decomposition of tetrafluoroborate ions (BF (4) (-) ) in H3BO3-Al3+-F- solutions were investigated via experiments and thermodynamic calculations. The concentration of the formed BF (4) (-) increased with decreasing pH, raising the total fluoride concentration and lowering the total aluminum ion concentration. Once formed, BF (4) (-) was stable under neutral and alkaline conditions. Fluoride in the form of BF (4) (-) was converted to fluoroaluminate ions by adding an aluminum compound under acidic conditions. A method for removing fluoride in the form of BF (4) (-) is proposed whereby fluoroaluminate ions formed by the reaction of BF (4) (-) 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.

引用

页码：136 / 146

页数：11

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