Table 3 Distribution of REE occurrence modes of LREEs and HREEs in the three size fractions S1 (< 0.25 mm), S2 (0.25–0.5), S3 (0.5–2 mm).
Sample | Content mg/kg | Physically adsorbed (%) | Chemically adsorbed (%) | Mineralized (%) | ||||
|---|---|---|---|---|---|---|---|---|
LREE | HREE | LREE | HREE | LREE | HREE | LREE | HREE | |
S1 | 2887.6 | 1716.3 | 11% | 67% | 3% | 16% | 86% | 17% |
S2 | 1577.1 | 1208.0 | 16% | 72% | 2% | 10% | 82% | 18% |
S3 | 1043.8 | 609.4 | 8% | 50% | 2% | 11% | 90% | 39% |
