Abstract SYMPHOS 2011
Abstract SYMPHOS 2011
Abstract SYMPHOS 2011
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EXTRACTION OF LANTHANIDES FROM<br />
THE BRAZILIAN PHOSPHATE ORES<br />
BN-O-08<br />
F. Pereira1 , E. Bilal1 and M. Nasraoui2 1 Ecole Nationale Supérieure des Mines de Saint-Etienne, FRANCE, CNRS - UMR 6524<br />
2 Institut Polytechnique LaSalle Beauvais, FRANCE<br />
Corresponding authors:<br />
Institut Polytechnique LaSalle Beauvais,<br />
19 rue Pierre Waguet, BP 30313, 60026<br />
BEAUVAIS Cedex, FRANCE<br />
École Nationale Supérieure des Mines<br />
de Saint-Étienne<br />
158, cours Fauriel F-42023<br />
SAINT-ÉTIENNE cedex 2, FRANCE<br />
The phosphate ore of Angico dos Dias (Caracol, Brazil) is composed of quartz, fluorapatite and mixed aggregates of<br />
kaolinite, Al-phosphates of the crandallite-group (with Ba, Sr and Ca), iron oxides/hydroxides, potassic feldspaths,<br />
titanite and magnetite with or without associated ilmenite. The principal rare earth elements (REE) bearing-mineral<br />
is monazite (64%) and to a lesser extent apatite (up to 1%). The monazite is characterized by a fine granulometry<br />
and occurs as inclusions either in apatite grains or in the mixed aggregates. Monazite is always bright contrasting<br />
with the light-grey Fe or Fe/Ti minerals. Agglomerates of several minerals are presents in high quantities.<br />
Figure 1 –BSE image of mixed aggregates<br />
(kaolinite, crandallite and iron oxides/hydroxides);<br />
monazite and apatite inclusions.<br />
The mean chemical composition of P-ore of Angico dos Dias show a CaO/P 2 O 5 ratio of 1.17 with high SiO 2 (25.06%)<br />
and Al 2 O 3 (9.06%) contents and low radioactive elements contents (Th and U
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