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Distribution examination and segregation of minerals cerium(Ce) and lanthanum (La) from metamorphic rocks of the Plattenkalk Unit in central Crete, Greece

Iliopoulos Gerasimos

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Summary

In this dissertation, the distribution of rare earth elements, mainly Ce and La in metamorphic rocks of Plattenkalk Group in Central Crete is being studied and examined. In this dissertation, there is reference and analysis to rare earth elements minerals as well as their metals. Metals of rare earth elements are of big commercial value and are used and applied in modern industry, amongst others, on the formulation of alloys, catalysts, ceramics and in pharmaceutical industry. Rare earth elements can be traced in allanite, a mineral of the epidote group. Allanite is traced in metamorphic rocks of the Plattenkalk Group. Overall, allanite can be found, mainly as an insignificant mineral, in a vast array of geological environment and different parts of Greece. Schist sample, quartz-schist sample in particular, has been collected in this religion. Mineral analysis of the original sample has been carried out, during which allanite has not been traced. After having fractured and sieved the sample at the size fraction (0,150mm+0,075mm), the albite mineral, connected to allanite in the region’s rocks, has been traced more specifically in size fractions. Five tests of beneficiation followed, using flotation, which focused on the above-mentioned size fractions. The rare earth elements were distributed mainly on a product of flotation of the first tests. In the end, based on the processing of data, the conclusion has been drawn that flotation is not regarded as an effective method of beneficiation of the allanite mineral, in the case where there are REE La and Ce, even though, flotation has been successful with specific products.

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