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    Title: Recovery of Fluoride as Perovskite-like Minerals from Industrial Wastewater
    Authors: Lee, Meng-Ting;Li, Chi-Wang;Liu, Jhy-Chern
    Keywords: Cryolite;Elpasolite;Fluoride;Perovskite-like minerals;Wastewater
    Date: 2015-12-17
    Issue Date: 2016-01-06 10:55:47 (UTC+8)
    Publisher: Pergamon Press
    Abstract: This study investigated the recovery of fluoride (626.5 mg/L) from an industrial wastewater as perovskite-like minerals. Effects of equilibrium pH (pHeq), 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 (Na3AlF6) when NaOH was the pH reagent at Na/F of 12/6, Al/F of 1/6 and pHeq 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.
    Relation: Separation and Purification Technology 156(3), pp.1057-1063
    DOI: 10.1016/j.seppur.2015.09.058
    Appears in Collections:[水資源及環境工程學系暨研究所] 期刊論文

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