Journal
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
Volume 12, Issue 2, Pages 136-146Publisher
SPRINGER
DOI: 10.1007/s10163-009-0281-1
Keywords
Tetrafluoroborate ion; Boron; Fluoride; Aluminum; Formation; Decomposition
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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.
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