Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: fractional crystallisation

Sortuj według:

Ogranicz wyniki do:

Structural state space in fractional crystallisation process synthesis

Dudczak J.

Polish Journal of Chemical Technology

2006

Vol. 8, nr 1

12-18

A method is presented for an algorithmic generation of all possible structures of a system in which a specified set of products is separated from a given set of feed streams by fractional crystallisation. The method employs three sets of transformation operators, which, together with some initial flowsheet, generate the space of system flowsheets in a systematic way. The space can be employed for the optimal crystallisation process design within the framework of optimisation methods of process synthesis.

Neoproterozoic flood basalts of the upper beds of the Volhynian Series (East European Craton)

Białowolska A., Bakun-Czubarow N., Fedoryshyn Y.

Geological Quarterly

2002

Vol. 46, No 1

37-58

The effusive rocks of the Ratno Beds of the Volhynian Series known from the western slope of the Ukrainian Shield are represented by lower Vendian flood basalts whose normative composition is that of quartz tholeiites. These are plagioclase-pyroxene basalts displaying intergranular, intersertal, doleritic, ophitic and amygdaloidal textures; they range from aphanitic to medium-grained and contain about 7 vol. % of palagonite - an altered glass with a high iron and considerable magnesium content. The range in composition of plagioclases (andesine-bytownite) and clinopyroxenes (augite-ferropigeonite) suggests that the Ratno Beds basalts formed by fractional crystallisation of a parent magma. Residual magma underwent liquation, producing a separate acid glass (69-73 wt. % of SiO2) phase within a basic one considerably poorer in SiO2 but rich in iron and magnesium. The Ratno Beds basalts are relatively rich in silica, iron, titanium and vanadium as well as in REE and LREE in particular but poor in Ni, Co and Cr. Normative composition, geochemical characteristics and tectonic position suggest classification as continental quartz tholeiites. Hydrothermal solutions are responsible for rich native copper mineralisation in basalts of certain parts of Volhynia (Ivance and Policy). The Vendian volcanism of the Volhynian Series lithologically correlated with the Sławatycze Series of eastern Poland, can be related to continental rifting accompanying the breakup of Rodinia, with crustal fractures mainly running concordantly with the suture zone between Fennoscandia and Sarmatia, thus almost perpendicular to the Tornquist rift; other fracture trends may also have controlled Vendian volcanism.