A novel recovery method for treating wastewater containing fluoride and fluoroboric acid

被引:21
作者
Itakura, Takeshi
Sasai, Ryo
Itoh, Hideaki
机构
[1] Nagoya Univ, Grad Sch Engn, Dept Appl Chem, Chikusa Ku, Nagoya, Aichi 4648603, Japan
[2] Nagoya Univ, EcoTopia Sci Inst, Div Environm Res, Chikusa Ku, Nagoya, Aichi 4648603, Japan
关键词
D O I
10.1246/bcsj.79.1303
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A new treatment method for wastewater containing concentrated fluoride and fluoroborate ions by hydrothermal treatment were developed. The treatment is an earth-mimetic method to produce natural minerals by hydrothermal treatment with Ca(OH)(2) as a mineralizer. Results of various analyses of the precipitate indicated that the recovered minerals were Ca2B2O5 center dot H2O (parasibirskite) and CaF2 (fluorite). By optimizing the conditions, it was possible to recover more than 98 percent of the boron and 99.9 percent of the fluorine from model wastewater samples containing fluoride (7000 mg L-1) and fluoroborate (8000 mg L-1) ions. Moreover, in the case of fluoroborate ions, the present treatment simultaneously caused the decomposition of the fluoroborate ion, the formation of each minerals, and the preventation of redissolution of parasibirskite. Therefore, the present hydrothermal mineralization treatment with the Ca(OH)(2) mineralizer is an effective technique to recover boron and fluorine from wastewater.
引用
收藏
页码:1303 / 1307
页数:5
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