Cryolite (Na3AlF6) crystallization for fluoride recovery using an electrolytic process equipped with a sacrificail aluminum anode
學年 108
學期 1
發表日期 2019-12-11
作品名稱 Cryolite (Na3AlF6) crystallization for fluoride recovery using an electrolytic process equipped with a sacrificail aluminum anode
作品名稱（其他語言）
著者 Vinh Ya; Chi-Wang Li
作品所屬單位
出版者
會議名稱 Deammonification and Environmental Technology and Management
會議地點 Bangkok, Thailand
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;Recovery;Chemical equilibrium modeling
語言 en
收錄於
會議性質 國際
校內研討會地點 無
研討會時間 20191211~20191213
通訊作者
國別 THA
公開徵稿
出版型式
出處
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/118749 )