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Synergistic extraction of rare earth elements and alumina from co.l fly ash by potassium pyrosulfate

Journal of Rare Earths 2024年第4期42卷 749-758页

作者： Jingjing Zou Yiping Sun Chunbin Guo Daye Chen Yonghong Song Yongfeng Wu Zhaotianhui Li Department of Environment Science and Engineering Liaoning Technical UniversityFuxin23000China Department of Materials Science and Engineering Liaoning Technical UniversityFuxin123000 China Technology Research and development Department Chinese Institute of Coal ScienceBeijing100013China shenhua zhungeer energy and resource comprehensive development co. Ltd.Erdos10300China Liaoning Yingguan High-tech Ceramic co. Ltd.Jinzhou121213China

Although co.l fly ash(CFA)co.tains a high co.tent of rare earth elements(REEs),the related extraction methods have limitations because of their low efficiencies,high levels of energy co.sumption,and other *** address these problems,in this study,we examined the co.xtraction of REEs and Al_(2)O_(3)from two types of Al_(2)O_(3)-rich CFA,pulverized CFA(PCFA)and circulating fluidized bed fly ash(CFBFA)using low-temperature calcination in the presence of K_(2)S_(2)O_(7).The total REEs,heavy REEs(HREEs),and light REEs(LREEs)extraction efficiencies were determined using different K_(2)S_(2)O_(7)/Al_(2)O_(3) molar ratios and calcination temperatures and co.related with the Al_(2)O_(3) extraction efficiency using Pearson co.relation co.fficient *** REEs are co.centrated within CFA particles encapsulated in an aluminosilicate glass phase,and the REEs extraction efficiency is related to the form of Al in *** extraction efficiencies of Al_(2)O_(3) and REEs increase as the K_(2)S_(2)O_(7)/Al_(2)O_(3) molar ratio and calcination temperature increase,and the extraction selectivity of the more industrially valuable HREEs from CFBFA is *** high K_(2)S_(2)O_(7)/Al_(2)O_(3) 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 *** Al_(2)O_(3) extraction efficiencies of PCFA as well as CFBFA co.relate strongly with the total REEs,HREEs,and LREEs extraction *** developed extraction technology has the potential to promote CFA valorization and expand REEs resources,thus mitigating the bottlenecks of REEs procurement.

关键词： Rare earths Alumina co.l fly ash Potassium pyrosulfate Calcination Extraction

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Study on extracting alumina from fly ash by co.pound additive activation method

引用

Global Geology 2014年第3期17卷 182-188页

作者： WANG Yongwang shenhua zhungeer energy resources comprehensive development co. Ltd.

Acco.ding to the chemical and mineral co.position characteristics of the fly ash,alumina can be extracted from fly ash through the calcining method by using sodium carbonate and calcium carbonate *** effects on leaching rate of alumina have been investigated. The results showed that the fly ash can be activated effectively and the leaching rate of alumina can be improved to more than 92% through this method. The best process parameters were the ratio of raw materials,i. e. the material weight ratio of fly ash,calcium carbonate and sodium carbonate was 1. 0∶1. 2∶0. 9. The activating temperature was 850℃-900℃,activating time was 3 h. This process has a potential application prospect and improves the value of comprehensive utilization of fly ash.

关键词：复合添加剂激活方法氧化铝粉煤灰提取综合利用价值工艺参数活化温度

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