Composition
Bulk chemical composition of the AoG Bauxite Residue (BR) according to Vind et al, 2018*
LOI % | Al2O3 % |
% |
% |
% |
% |
% |
mg/kg |
mg/kg |
mg/kg | |
BR (AoG) | 9.14 | 20.64 | 41.65 | 6.76 | 5.32 | 10.07 | 2.87 | 1429 | 1029 | 97.6 |
The bulk chemical composition of the main elements was determined by standardized X-ray fluorescence (XRF), Cr and V were analyzed by inductively coupled plasma mass spectrometry (ICP-MS) after lithium metaborate/tetraborate fusion. Sc was analyzed in Activation Laboratories Ltd. (Ancaster, ON, Canada) by instrumental neutron activation analysis (INAA). (Vind et al, 2018)
*Vind, J., Malfliet, A., Bonomi, C., Paiste, P., Sajó, I.E., Blanpain, B., Tkaczyk, A.H., Vassiliadou, V., Panias, D. (2018) Modes of occurrences of scandium in Greek bauxite and bauxite residue, Minerals Engineering 123, 35–48.
Rare-earth elements (REE)* composition of the bauxite residue from Aluminium of Greece, Agios Nikolaos, Greece**, based on Borra et al, 2015***
Element | Concentration (g/t) |
Sc | 121 ± 10 |
Y | 75.7 ± 9.6 |
La | 114 ± 15 |
Ce | 368 ± 68 |
Pr | 28.0 ± 3.9 |
Nd | 98.6 ± 7.0 |
Sm | 21.3 ± 2.3 |
Eu | 5.0 ± 0.9 |
Gd | 22.0 ± 1.9 |
Tb | 3.5 ± 0.6 |
Dy | 16.7 ± 0.7 |
Ho | 3.9 ± 0.6 |
Er | 13.5 ± 1.8 |
Tm | 1.9 ± 0.3 |
Yb | 14.0 ± 1.9 |
*Detection limit of a REE is 1 g/t
** the bauxite residue originated from a mixture of karst and lateritic bauxites and is similar to the bauxite residue examined by Ochsenkühn-Petropulu et al. (1994).*** It was received from the alumina refinery after dewatering by filter presses and room temperature drying.
***Borra, C.R., Pontikes, Y., Binnemans, K. and Van Gerven, T. (2015) Leaching of rare earths from bauxite residue (red mud). Minerals Engineering, 76, 20–27.
***Ochsenkühn-Petropulu, M., Lyberopulu, T., Parissakis, G., 1994. Direct determination of lanthanides, yttrium and scandium in bauxites and red mud from alumina production. Anal. Chim. Acta 296 (3), 305–313