Analysis of enrichment, correlation, and leaching patterns of rare earth elements in coal fly ash assisted by statistical measures

Ju, Tongyao; Meng, Yuan; Han, Siyu; Meng, Fanzhi; Lin, Li; Li, Jinglin; Jiang, Jianguo

doi:10.1016/j.scitotenv.2023.166070

Cited by 5 publications

(1 citation statement)

References 40 publications

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“…From the economic aspect, the REYs were also divided into the critical (Eu, Tb, Nd, Dy, Y, Er) and excessive (Ce, Yb, Ho, Tm, Lu) REY groups [ 7 ]. Critical percentage and the outlook coefficient (C outl ) are the two parameters that verify if CFA is worth recovering the REY or not [ 64 ]. Thus, if %Critical ≥ 30% and C outl ≥ 0.7, the material can be considered a promising secondary source to recover the REY.…”

Section: Resultsmentioning

confidence: 99%

Ecological and Health Risks Attributed to Rare Earth Elements in Coal Fly Ash

Slavković-Beškoski,

Ignjatović,

Ćujić

et al. 2024

Toxics

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The occurrence and distribution of yttrium and rare earth elements (REYs), along with major elements and heavy metal(loid)s (HMs) in coal fly ash (CFA) from five coal-fired power plants (CFPPs), were analyzed, and the REY-associated ecological and health risks were assessed. The individual REYs in CFA were abundant in the following order: Ce > La > Nd > Y > Pr > Gd > Sm > Dy > Er > Yb > Eu > Ho > Tb > Tm > Lu. The total REY content ranged from 135 to 362 mg/kg, averaging 302 mg/kg. The mean light-to-heavy REY ratio was 4.1, indicating prevalent light REY enrichment in CFA. Significantly positive correlations between the REYs suggested that they coexist and share similar origins in CFA. REYs were estimated to pose low to moderate ecological risks, with risk index (RI) values ranging from 66 to 245. The hazard index (HI) and target cancer risk (TCR) of REYs from CFA, estimated to be higher for children (HIc = 0.15, TCRc = 8.4 × 10−16) than for adults (HIa = 0.017, TCRa = 3.6 × 10−16), were well below the safety limits (HI = 1, TCR = 1.0 × 10−6). However, the danger to human health posed by HMs in the same CFA samples (HIc = 5.74, TCRc = 2.6 × 10−4, TCRa = 1.1 × 10−4) exceeded the safe thresholds (excl. HIa = 0.63). The mean RI and HI attributed to REYs in CFA were 14% and 2.6%, respectively, of the total risks that include HMs.

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Section: Resultsmentioning

confidence: 99%