Synergistic extraction of rare earth elements and alumina from coal fly ash by potassium pyrosulfate,Journal of Rare Earths

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Synergistic extraction of rare earth elements and alumina from coal fly ash by potassium pyrosulfate
Journal of Rare Earths ( IF 5.2 ) Pub Date : 2024-01-19 , DOI: 10.1016/j.jre.2024.01.008
Jingjing Zou , Yiping Sun , Chunbin Guo , Daye Chen , Yonghong Song , Yongfeng Wu , Zhaotianhui Li

Although coal fly ash (CFA) contains a high content of rare earth elements (REEs), the related extraction methods have limitations because of their low efficiencies, high levels of energy consumption, and other drawbacks. To address these problems, in this study, we examined the coextraction of REEs and AlO from two types of AlO-rich CFA, pulverized CFA (PCFA) and circulating fluidized bed fly ash (CFBFA) using low-temperature calcination in the presence of KSO. The total REEs, heavy REEs (HREEs), and light REEs (LREEs) extraction efficiencies were determined using different KSO/AlO molar ratios and calcination temperatures and correlated with the AlO extraction efficiency using Pearson correlation coefficient analysis. The REEs are concentrated within CFA particles encapsulated in an aluminosilicate glass phase, and the REEs extraction efficiency is related to the form of Al in CFA. The extraction efficiencies of AlO and REEs increase as the KSO/AlO molar ratio and calcination temperature increase, and the extraction selectivity of the more industrially valuable HREEs from CFBFA is higher. At high KSO/AlO molar ratios, the extraction of REEs from PCFA is more efficient than that from CFBFA with the regeneration of the highly active Al–O–Si bonds in CFBFA. The AlO extraction efficiencies of PCFA as well as CFBFA correlate strongly with the total REEs, HREEs, and LREEs extraction efficiencies. The developed extraction technology has the potential to promote CFA valorization and expand REEs resources, thus mitigating the bottlenecks of REEs procurement.

更新日期：2024-01-19

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