Science of Sintering 2021 Volume 53, Issue 2, Pages: 169-185
https://doi.org/10.2298/SOS2102169M
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Assessment of efficiency of rare earth elements recovery from lignite coal combustion ash via five-stage extraction
Miličić Ljiljana 
(Institute for Testing of Materials IMS, Belgrade, Serbia)
Terzić Anja (Institute for Testing of Materials IMS, Belgrade, Serbia), anja.terzic@institutims.rs
Pezo Lato (Institute of General and Physical Chemistry, University of Belgrade, Belgrade, Serbia)
Mijatović Nevenka (Institute for Testing of Materials IMS, Belgrade, Serbia)
Brčeski Ilija (Faculty of Chemistry, University of Belgrade, Belgrade, Serbia)
Vukelić Nikola (Faculty for Physical Chemistry, University of Belgrade, Belgrade, Serbia)
Rare earth elements (REE) are frequently referred to as ingredients for
enhancements in modern industry, as they are extensively applied in many
industrial branches due to their accented electro-magnetic and optical
properties. REE have end-utilizations as catalysts, magnets, and as dopants
for ceramic materials. Rare earth minerals are scarce therefore the
unconventional REE-containing resources such as waste materials and
industrial byproducts are continuously being investigated. Coal combustion
products comprise REE concentrations varying between 200 ppm and 1500 ppm.
This quantity can be isolated though the extraction procedure. In this
study, the five stages extraction was conducted on the coal combustion ash
from the selected landfill site. The extractions of 32 elements (As, Ga, Ce,
Be, Ge, Nd, Cr, Zr, Eu, Cu, Nb, Gd, Co, Mo, Dy, Li, Ag, W, Mn, Cd, Au, Ni,
In, Hg, Pb, Sn, Tl, V, Sb, Th, Zn, and La) were conveyed. Chemical analyses
were conducted via XRF, ICP-OES, ICP-MS, and AAS techniques. The complexity
of the obtained data was examined by Principal component analysis and
Cluster analysis in order to derive interconnections between quantity of
elements and landfill characteristics, as well as mutual relationships among
the elements of interest, and to assess the accomplishment of REE recovery
from the coal ash.
Keywords: Powdery materials, Industrial byproduct, Chemical extraction, Analytical modeling, Dopants for ceramic materials
Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. 451-03-68/2020-14/200012