Recovery of fluoride as perovskite-like minerals from industrial wastewater

被引：20
作者：
Lee, Meng-Ting [1 ]
Li, Chi-Wan [2 ]
Liu, Jhy-Chern [1 ]
机构：
[1] Natl Taiwan Univ Sci & Technol, Dept Chem Engn, Taipei 106, Taiwan
[2] Tamkang Univ, Dept Water Resources & Environm Engn, New Taipei 25137, Taiwan
来源：
SEPARATION AND PURIFICATION TECHNOLOGY | 2015年 / 156卷
关键词：
Cryolite; Elpasolite; Fluoride; Perovskite-like minerals; Wastewater; PILOT-SCALE; ALUMINUM; CRYOLITE; PRECIPITATION; REMOVAL;
D O I：
10.1016/j.seppur.2015.09.058
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
This study investigated the recovery of fluoride (626.5 mg/L) from an industrial wastewater as perovskite-like minerals. Effects of equilibrium pH (pH(eq)), molar ratio of Na to F (Na/F), and types of pH reagents were examined. Fluoride was recovered and confirmed by XRD as elpasolite (K2NaAlF6) when pH reagent was KOH. High fluoride removal efficiency (>94.7%) was found at Na/F of 3/6, Al/F of 1/6, room temperature, and pHeq range of 4.2-5.7. Satisfactory K2NaAlF6 recovery and fluoride removal were found as Na/F reduced to 1/6. Fluoride was recovered as cryolite (Na(3)AIF(6)) when NaOH was the pH reagent at Na/F of 12/6, Al/F of 1/6 and plieg range of 5.5-7.2, and good fluoride removal efficiency (>94.5%) was found. Size analysis and sedimentation test showed that both K2NaAlF6 and Na3AlF6 could be easily separated from water. The current study demonstrated simple and energy-efficient alternatives for fluoride recovery as potentially reusable minerals from wastewater. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：1057 / 1063
页数：7
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