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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/115810

    Title: Cryolite (Na3AlF6) crystallization for fluoride recovery using an electrolytic process equipped with a sacrificial aluminum anode
    Authors: Ya, Vinh;Chen, Yi-Chieh;Chou, Yi-Hsuan;Choo, Kwang-Ho;Liu, Jhy-Chern;Mameda, Naresh;Li, Chi-Wang
    Keywords: Electro-crystallization;Cryolite;Fluoride;RecoveryChemical equilibrium modeling
    Date: 2019-04-15
    Issue Date: 2019-02-22 12:12:24 (UTC+8)
    Abstract: An electro-crystallization process equipped with a sacrificial aluminum anode was operated under an optimum condition to promote the formation of crystalline cryolite for the recovery of fluoride from synthetic F-containing wastewater. The effects of pH, Al/F molar ratio, initial F concentration, and electrolytes were investigated experimentally, and the results were compared with data obtained from chemical equilibrium modeling. Cryolite was successfully produced under optimum pH values of 5 to 6 and Al/F molar ratios of less than 1/6. The F removal increased with increasing Al/F molar ratio until reaching the molar ratio of 1/6 and decreased thereafter due to the formation of AlFn3−n species. The adsorption of AlFn3−n by Al(OH)3 precipitates contributed part of F removal. The removal efficiency reached 100% when the initial fluoride concentration was high while it was around 90% with the low initial fluoride concentration. XRD and SEM/EDX analysis showed that the obtained solids matched well to the commercial cryolite. Finally, the operating costs of chemical-crystallization (the process with Al ions added chemically) and electro-crystallization were compared, and the cost of the former was less than the latter. Energy consumption was the main contributor to the operating cost of the electro-crystallization process.
    Relation: Journal of Hazardous Materials 368, p.90-96
    DOI: 10.1016/j.jhazmat.2019.01.033
    Appears in Collections:[Graduate Institute & Department of Water Resources and Environmental Engineering] Journal Article

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