102,017 research outputs found
Foreste fossili del Miocene inferiore e implicazioni paleoambientali nella Sardegna settentrionale
No full textIl Monte Zuighe (Sardegna centro-occidentale): osservazioni stratigrafiche e litogeochimiche
No full text
Colmamento vulcano-sedimentario del bacino di Oschiri-Berchidda, una struttura trasversale del rift oligo-miocenico della Sardegna.
No full textCaratteristiche paleobotaniche e stratigrafiche delle foreste fossili mioceniche della Sardegna settentrionale.
No full textPalmocaulon logudorensenov. sp. (Arecaceae) from the Lower Miocene of the Rio Mannu Basin (Sardinia, Italy)
No full textOn a etudie l'anatomie d'un petiole fossile de palmier (Arecaceae) decouvert dans le Bassin du Rio
Mannu di Ittiri (NO Sardaigne), dans des sediments d'age burdigalien. La comparaison des caract~res de l'echantillon
avec ceux des taxa fossiles et actuels conduit h la conclusion qu'il appartient a une nouvelle espece,
Palmocaulon logudorenseViene qui presentato lo studio anatomico di un picciolo fossile di palma (Arecaceae). Il reperto proviene
da sedimenti di età burdigaliana del Bacino del Rio Mannu (Ittiri, Sardegna NW). Dal confronto con taxa fossili
e attuali si deduce che il fossile appartiene alla nuova specie Palmocaulon logudorenseAn anatomical study of a fossil palm petiole (Arecaceae) was carried out. The fossil was found in sediments
of Burdigalian age in the Rio Mannu basin (Ittiri, NW Sardinia). From a comparison with both fossil and existing
taxa it is concluded that the fossil palm belongs to the new species, Palmocaulon logudorense
Reuse of products from waste anodes of aluminium smelter
No full textThis study aims to assess the presence of fluorine in products (concentrates and
tailings) of selective froth flotation of materials resulting from demolition of electrolytic cells
used in aluminium electromining. In fact in a previous work (Ciccu et al. 2009) the possibility of
recovering a combustible matter from this wastes using froth flotation has been studied.
In particular the following aspects have been evaluated:
· The relationship between F and C contents in flotation products
· The need to reduce the content of F in the concentrates for use them as fuels in accordance
with the current national and international laws
· The convenience to reduce the content of F in the flotation tailings destined to waste deposits.
The levels of F assessed in the products suggest to consider the possibility of recovering this
element as by-product to be used in the cement industry. The results show that the presence of F
in the products of froth flotation, although being a penalizing element, does not preclude the
recovery of this material to be used as fuel, especially if appropriate precautions are taken
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