Adamczyk Zdzisław, Komorek Joanna, Kokowska-Pawłowska Magdalena, Nowak Jacek
Faculty of Mining, Safety Engineering and Industrial Automation, Silesian University of Technology, Akademicka 2A, 44-100 Gliwice, Poland.
Materials (Basel). 2024 Sep 12;17(18):4477. doi: 10.3390/ma17184477.
Rare earth elements are an essential critical raw material in the development of modern technologies and are highly sensitive to both supply chain disruptions and market turbulence. The presented study examines the characteristics of fuel, fly ash, and bottom ash from lignite combustion in power plant units. Also, we attempted to determine the amount of amorphous glass in the ashes and whether and to what extent the glass from the ash samples is bound to REY. The suitability of the ash was assessed as an alternative source of REY. The fuel and ash samples were acquired from power plants in Poland. The tests determined the fuel quality parameters, including the chemical and phase composition, of amorphous glass using ICP-MS and XRD methods, respectively. The study showed that all ash samples dissolved in 4% HF were enriched in REY. The efficiency of REY enrichment varied, and its presence in the residue samples was found to be in similar proportions compared to the raw sample. All ash residue samples were enriched in critical elements. The obtained values of the C prospective coefficient allowed for the classification of some of the analyzed ashes and their residues after dissolution in 4% HF as prospective REY raw materials.
稀土元素是现代技术发展中必不可少的关键原材料，对供应链中断和市场动荡高度敏感。本研究考察了电厂机组中褐煤燃烧产生的燃料、飞灰和底灰的特性。此外，我们试图确定灰中无定形玻璃的含量，以及灰样品中的玻璃是否与稀土元素钇（REY）结合以及结合程度如何。评估了灰作为稀土元素钇替代来源的适用性。燃料和灰样品取自波兰的发电厂。测试分别使用电感耦合等离子体质谱法（ICP-MS）和X射线衍射法（XRD）测定了燃料质量参数，包括无定形玻璃的化学和相组成。研究表明，所有溶解于4%氢氟酸（HF）中的灰样品都富含稀土元素钇。稀土元素钇的富集效率各不相同，且发现其在残留样品中的存在比例与原始样品相似。所有灰渣样品都富含关键元素。所得的C前景系数值使得一些分析的灰及其在溶解于4%氢氟酸后产生的残渣可被归类为潜在的稀土元素钇原材料。
