Formation and decomposition of tetrafluoroborate ions in the presence of aluminum

被引：0

作者：

Junya Katagiri

Siqingaowa Borjigin

Toshiaki Yoshioka

Tadaaki Mizoguchi

机构：

[1] Tohoku University,Environment Conservation Research Institute

[2] Tohoku University,Graduate School of Environmental Studies

来源：

Journal of Material Cycles and Waste Management | 2010年 / 12卷

关键词：

Tetrafluoroborate ion; Boron; Fluoride; Aluminum; Formation; Decomposition;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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.

引用

页码：136 / 146

页数：10

共 39 条

[1]

Ando J.(1974)Removal of fluorine from wastewaters (1). Lime addition and effect of aluminum ion Gypsum Lime 133 216-221

[2]

Mori M.(1978)Advanced treatment process of fluoridecontaining waste water (in Japanese) Yosui to Haisui 20 667-674

[3]

Ohno Y.(2000)Technologies for treating fluoride and boron-containing waste water (in Japanese) Kankyo Gijutsu 29 283-289

[4]

Eto Y.(1982)Sludge reduction in coal-fired power plant flue-gas desulfurization waste treatment (in Japanese) Karyoku Genshiryoku Hatsuden 33 1319-1324

[5]

Takadoi T.(1982)Sludge reduction in coal-fired power plant flue-gas desulfurization waste water treatment (in Japanese) Karyoku Genshiryoku Hatsuden 33 913-921

[6]

Asada H.(1980)The trace element chemistry of coal during combustion and the emissions from coal-fired plants Prog Energy Combust Sci 6 53-119

[7]

Eto Y.(1999)Partitioning behaviour of some toxic volatile elements during stoker and fluidised bed combustion of alkaline sub-bituminous coal Fuel 78 1379-1385

[8]

Shirakura S.(2000)Partitioning behaviour of some toxic trace elements during coal combustion — the influence of events occurring during the deposition stage Fuel 79 1781-1784

[9]

Eto Y.(2006)Basic study on the determination of total boron by conversion to tetrafluoroborate ion (BF Anal Chim Acta 570 65-72

[10]

Takadoi T.(1982)) followed by ion chromatography PPM 13 57-64

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