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Extraction of Aluminum from Coal Fly Ash Using Pressurized Sulfuric Acid Leaching with Emphasis on Optimization and Mechanism
JOM ( IF 2.1 ) Pub Date : 2021-07-29 , DOI: 10.1007/s11837-021-04801-z
Peng Wang 1 , Huiyong Liu 1 , Fangyan Zheng 1 , Yue Liu 1 , Ge Kuang 1 , Rongdong Deng 2 , Huan Li 3
Affiliation  

Coal fly ash, commonly produced from thermal power plants, is not only an industrial waste but an aluminum-rich resource that needs to be disposed of properly. This study aims to extract aluminum from coal fly ash using pressurized sulfuric acid (H2SO4) leaching and to investigate the dissolution mechanism during the leaching process. The effects of initial concentration of H2SO4, reaction temperature and time on the extraction of aluminum were investigated. Under optimized conditions (3 mol/l H2SO4, 220°C and 180 min), the extraction of aluminum reached 82.51%. It was found that mullite (3Al2O3·2SiO2) contained in coal fly ash was completely dissolved during the leaching, while the dissolution of silica-alumina glass beads was at a limited degree. The un-leached aluminum was found to be locked inside the glass beads which H2SO4 was unable to access.



中文翻译:

以优化和机理为重点的加压硫酸浸出粉煤灰中铝

通常由火力发电厂产生的粉煤灰不仅是一种工业废物,而且是一种需要妥善处理的富含铝的资源。本研究旨在使用加压硫酸 (H 2 SO 4 ) 浸出从粉煤灰中提取铝,并研究浸出过程中的溶解机制。考察了H 2 SO 4初始浓度、反应温度和时间对铝提取的影响。在优化条件下(3 mol/l H 2 SO 4、220℃、180 min),铝的提取率达到82.51%。发现莫来石(3Al 2 O 3 ·2SiO 2) 粉煤灰在浸出过程中完全溶解,而硅铝玻璃珠的溶解程度有限。发现未浸出的铝被锁定在 H 2 SO 4无法进入的玻璃珠内。

更新日期:2021-08-26
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