Cryolite (Na3AlF6) crystallization for fluoride recovery using an electrolytic process equipped with a sacrificial aluminum anode
學年 107
學期 2
出版（發表）日期 2019-04-15
作品名稱 Cryolite (Na3AlF6) crystallization for fluoride recovery using an electrolytic process equipped with a sacrificial aluminum anode
作品名稱（其他語言）
著者 Ya, Vinh; Chen, Yi-Chieh; Chou, Yi-Hsuan; Choo, Kwang-Ho; Liu, Jhy-Chern; Mameda, Naresh; Li, Chi-Wang
單位
出版者
著錄名稱、卷期、頁數 Journal of Hazardous Materials 368, p.90-96
摘要 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.
關鍵字 Electro-crystallization;Cryolite;Fluoride;RecoveryChemical equilibrium modeling
語言 en_US
ISSN
期刊性質 國外
收錄於 SCI EI
產學合作
通訊作者 Chi-Wang Li
審稿制度 是
國別 GBR
公開徵稿
出版型式 ,電子版,紙本
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