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

页码：1057 / 1063

页数：7

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