Vliv hydrodynamických podmínek na růst sádrovce

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Title in English	Impact of hydrodynamic conditions on gypsum growth
Authors	POSPÍŠILOVÁ Jarmila FAIMON Jiří
Year of publication	2011
Type	Article in Periodical
Magazine / Source	Geologické výzkumy na Moravě a ve Slezsku
MU Faculty or unit	Faculty of Science
Citation
Field	Geochemistry
Keywords	gypsum; crystal growth; induction time; hydrodynamic conditions; nucleation; rate
Description	The interaction of gypsum (CaS04.2H20) with water is controlled by mixed transport-surface reaction kinetics. Therefore, the rate of gypsum growth/precipitation should depend on hydrodynamic conditions. Gypsum nucleation and crystal growth were studied in a batch reactor under ambient conditions in dependence on varying hydrodynamic conditions (advection of solution). The statistically significant dependence (R2 = 0.875), u = 4E-7*v+0.0007 (where u is crystal growth rate in mol/min and v is stirring rate in rpm) was found for gypsum growth rate and stirring rate of solution. In contrast, induction times at gypsum nucleation were slightly increasing, i.e., nucleation rates decreased with increasing stirring rate. However, no statistically significant dependence (R2 = 0.115) was found.
Related projects:	Interactions among the chemicals, environment and biological systems and their consequences on the global, regional and local scales (INCHEMBIOL)