Assessment of efficiency of rare earth elements recovery from lignite coal combustion ash via five-stage extraction

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 cera...

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Bibliographic Details
Published in:Science of sintering 2021, Vol.53 (2), p.169-185
Main Authors: Milicic, Ljiljana, Terzic, Anja, Pezo, Lato, Mijatovic, Nevenka, Brceski, Ilija, Vukelic, Nikola
Format: Article
Language:English
Subjects:
analytical modeling
Antimony
Beryllium
By products
Cadmium
Cerium
Chemical elements
chemical extraction
Chromium
Cluster analysis
Coal
Cobalt
Combustion products
Composite materials
Copper
dopants for ceramic materials
Dysprosium
Extraction procedures
Fly ash
Gadolinium
Gallium
Gold
industrial byproduct
Landfill
Lanthanum
Lignite
Magnetic properties
Magnets
Nickel
Niobium
Optical properties
powdery materials
Principal components analysis
Rare earth elements
Recovery
Trace elements
Waste materials
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Summary: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.
ISSN:0350-820X
1820-7413
DOI:10.2298/SOS2102169M