Recovery of fluoride as perovskite-like minerals from industrial wastewater

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.