Analysis of fly ash for obtaining rare earth elements
1
Zakład Geotechnologii, Instytut Gospodarki Surowcami Mineralnymi i Energią PAN, Kraków
2
Katedra Geotechniki, Wydział Budownictwa i Architektury, Politechnika Lubelska, Lublin
Polityka Energetyczna – Energy Policy Journal 2014;17(3):369-380
KEYWORDS
ABSTRACT
This paper presents the results of efforts to acquire rare earth elements from fly ash derived from
burning bituminous (Sample 1) and lignite (Sample 2) coals. On selected samples, analysis of XRD and
SEM-EDS was carried out to determine their mineral composition, while chemical analyses made it
possible to determine the composition of major trace elements and rare earth elements. Test ashes are
composedmainly of aluminosilicate, quartz, and in the case of Sample 1, mullite, magnetite, and hematite.
Sample 2 also contained lime, calcite, anhydrite, and plagioclase. Both tested ashes contained relatively
high quantities of rare earths (about 450 ppm). Greater content was recorded for the ash from lignite.
Among the studied rare earth elements, the largest quantities were recorded for cerium (110 ppm Sample
1, 142 ppm – Sample 2), lanthanum (55 ppm Sample 1, 76 ppm Sample 2), neodymium (49 ppm Sample 1,
69 ppm Sample 2), and yttrium (47 ppm – Sample 1, 63 ppm Sample 2). The content of rare earth elements
in the studied fly ashes are similar to the results obtained by other authors for this type of ash; they may
therefore be a potential source for REE acquisition.
METADATA IN OTHER LANGUAGES:
Polish
Analiza popiołów lotnych pod kątem uzyskania z nich
pierwiastków ziem rzadkich
REE, popiół lotny, pierwiastki śladowe
W pracy przedstawiono wyniki badań popiołów lotnych otrzymywanych ze spalania
węgla kamiennego (Próbka 1) i brunatnego (Próbka 2) w aspekcie pozyskiwania z nich pierwiastków
ziem rzadkich (REE). Na wybranych próbkach przeprowadzono analizy XRD
i SEM-EDS celem określenia ich składu mineralnego oraz chemiczne, które pozwoliły określić
ilość pierwiastków głównych, śladowych oraz pierwiastków ziem rzadkich. Badane popioły
w składzie mineralnym posiadają głównie szkliwo glinokrzemianowe, kwarc oraz w przypadku
Próbki 1: mullit, magnetyt i hematyt, natomiast w Próbce 2 stwierdzono: wapno, kalcyt, anhydryt,
pla- gioklazy. Analizując ilość pierwiastków ziem rzadkich oba badane popioły zawierają w sobie
stosunkowo wysokie ich ilości (rzędu 450 ppm).Większe zawartości REE posiada popiół z węgla
brunatnego. Spośród badanych pierwiastków ziem rzadkich największe ilości zanotowano dla
ceru (110 ppm – Próbka 1, 142 ppm Próbka 2), lantanu (55 ppm – Próbka 1, 76 ppm – Próbka 2),
neodymu (49 ppm – Próbka 1, 69 ppm – Próbka 2) i itru (47 ppm Próbka 1, 63 ppm – Próbka 2).
Zawartości pierwiastków ziem rzadkich w badanych popiołach lotnych są zbliżone do wyników
uzyskanych przez innych autorów dla tego typu popiołów, dlatego też mogą one stanowić
potencjalne źródło pozyskiwania z nich REE.
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