Carlo Adamoli
Process for the extration of bases of rare elements contained in ores and rocks

Pagina 3

[Indice]

According to the present invention, it has been found that in many cases by combining the action of strong acids such as HC1, HNO3, H2SO4 or trichloracetic acid, with the action of fluorides which are not easily soluble in water such as CaF2, MgF2, AlF2a, PbF2, LiF, CuF2, SrF2, it is possible to solubilize chemical elements of this kind which are contained in the treated mineral matter, without the siliceous or silico-aluminous gangue being converted or rendered soluble under the condition that a greater chemical affinity is preserved between them and suitable reagents formed, more particularly, of water soluble salts of the said acids. This novel extraction process can be applied without important modifications to elements of very different chemical groups such as, for instance, to heavy metals such as niobium, tantalum, thorium and zirconium, to earthy metals such as beryllium, germanium and scandium, and to alkali metals such as caesium and lithium. It is evident that by the character of the process itself, which is suitable for the extraction of small quantities of elements which are contained in much larger quantities of starting materials, the economy of the extraction process has a fundamental importance; it is precisely what is performed according to the process which will be presently described by means of a closed cycle of chemical conversions, the said cycle permitting the constant regeneration of the reagents which are used and which, furthermore, regardless of the quantity of mass which is submitted to the treatment, are stoichiometrically proportioned to the sole element to be extracted. For more clearness a typical non-limitative scheme of the cycle of operations will be disclosed and described hereinafter with reference to the appended drawing.

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