Dissolution of aluminum hydroxide to provide Al and to neutralize acidity for the removal and recovery of fluoride through cryolite crystallization
學年 111
學期 2
出版（發表）日期 2023-03-27
作品名稱 Dissolution of aluminum hydroxide to provide Al and to neutralize acidity for the removal and recovery of fluoride through cryolite crystallization
作品名稱（其他語言）
著者 Sabine Jessica Ouedraogo; Ya Vinh; Pongsak (Lek) Noophan; Vincenzo Naddeo; Chi-Wang Li
單位
出版者
著錄名稱、卷期、頁數 Journal of Cleaner Production
摘要 Dissolution of aluminum hydroxide (Al(OH)3(s)) was investigated for providing Al and at the same time neutralizing the acidity generated in the recovery of fluoride through the crystallization of cryolite. The alkalinity provided by the dissolution of Al(OH)3(s) combined with Na2CO3 reduces the total treatment cost for fluoride recovery by 45%, compared to when other aluminum salts were used. In this study, two types of aluminum hydroxide having different degrees of crystallinity of 61.53% and 25.57%, denoted as crystalline Al(OH)3(s) (CAH) and amorphous Al(OH)3(s) (AAH), respectively, were investigated. The results showed that the dissolution of AAH was very efficient but an excess amount of AAH adsorbed the freshly formed complexes, impairing the purity of cryolite. On the other hand, the dissolution of the CAH was mostly dependent on the time, the Al dosage, and the initial pH of the solution. Upon reaching equilibrium, the dissolved Al to the initial F molar ratio reached 2/6. With the mixed volume ratio of 1:1 between the raw HF solution and the HF solution being equilibrated with CAH initially, the removal of F reached 96% and the cryolite formation was positively confirmed based on the XRD analysis of the resulting solid.
關鍵字
語言 en
ISSN 1879-1786; 0959-6526
期刊性質 國外
收錄於 SCI
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
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/123108 )

SDGS 潔淨水與衛生,產業創新與基礎設施