Table 3.

Rare earth metal content in various anthropogenic waste (adapted for typical studies reported in the literature elsewhere)

REMs	REM wt %					REM mg/kg−1
	REPM Magnet NdFeB (Zhang et al. 2020b)	Battery (Lie and Liu 2021)	FCC Catalyst (Zhao et al. 2017; Sposato et al. 2021)	Phosphorous (Yurramendi et al. 2019)	Red Mud (Swain et al. 2020b)	Slags (Kasina and Michalik 2016)				Coal Mine (Zheng et al. 2017)	Coal Fly Ash (Franus et al. 2015)
						Steel Making Slag (SMS)	Blast Furnace Slag (BFS)	Electric arc furnace dust (EAF)	Ladle furnace slag (LFS)
Sc	–	–	–		121 ± 10	1.0	9–11	1.0	3.0	–	7–45
Y	–	–	–	6.29	75.7 ± 9.6	3.9–4.2	34.8–36.6	4.1	13.8	0.2–575	17.9–73.2
La	0–1.58	8.96	1.5–1.92	0.90	114 ± 15	2.8–3.8	24.5–25.9	9.4	12.7	0.2–32.9	15.5–81.7
Ce	–	2.7	0–0.29	0.74	368 + 68	4.4–3.8	50.3–58.2	18.1	26.3	0.13–255	30.7–172.5
Pr	0.07–7.1	–	–	–	28.0 ± 3.9	0.61–0.54	5.98–6.71	2	3.4	0.005–16.7	3.3–20.51
Nd	10–31	2.7	–	–	98.6 ± 7.0	2.3–2	23.1–27.1	8.4	12.4	0.05–86.2	12.7–81.3
Sm	0–0.77	–	–	–	21.3 ± 2.3	0.4–0.32	4.7–5.35	0.9	1.8	0.1–28.9	2.8–17.0
Eu	–	–	–	0.43	5.0 ± 0.9	0.07–0.08	1.44–1.57	0.15	0.31	0.003–8.16	0.56–3.81
Gd	0.02–1.51	–	–	0.14	22.0 ± 1.9	0.42–0.41	4.75–5.35	0.8	1.6	0.02–42.1	2.85–14.65
Tb	0–0.41	–	–	0.32	3.5 ± 0.6	0.06–0.07	0.82–0.9	0.1	0.2	0.003–3.52	0.45–2.4
Dy	–	–	–	–	16.7 ± 0.7	0.4–0.31	4.86–5.26	0.9	1.6	0.01–37.3	2.61–12.18
Ho	–	–	–	–	3.9 ± 0.6	0.08–0.09	0.91–1.03	0.1	0.3	0.003–7.31	0.59–2.58
Er	–	–	–	–	13.5 ± 1.8	0.27–0.24	2.98–3.2	0.5	0.8	0.02–19.4	1.79–7.41
Tm	–	–	–	–	1.9 ± 0.3	0.03	0.45–0.5	–	0.1	0.001–2.24	0.27–1.07
Yb	–	–	–	–	14.0 ± 1.9	0.26–0.21	2.76–3.09	0.3	0.7	0.0112.9	1.80–6.74
Lu	–	–	–	–	2.4 ± 0.3	0.04	0.41–0.46	–	0.1	0.002–1.84	3–1.03
Total	10.09–42.37	14.36	1.5–2.21	8.82	909.3	12.14–11.94	127–145	41.56	62.31	0.29–1134	101–543