The influence of a permanent magnetic field on the crystallization of calcium carbonate from carbonate aqueous solutions

V.R. Gayevskii; B.D. Nechyporuk; S.G. Gayevska

doi:10.15330/pcss.24.4.616-622

Authors

V.R. Gayevskii National University of Water and Environmental Engineering, Rivne, Ukraine
B.D. Nechyporuk Rivne State University of Humanities, Rivne, Ukraine
S.G. Gayevska Rivne Scientific Research Forensic Center of the Ministry of Internal Affairs of Ukraine, Rivne, Ukraine

DOI:

https://doi.org/10.15330/pcss.24.4.616-622

Keywords:

magnetic treatment, crystallization of calcium carbonate, carbonate water system, electrolyte solutions, Debye-Hückel theory, approximation method, XRD, Debye-Scherrer method

Abstract

The effect of a permanent magnetic field on the crystallization of calcium carbonate from carbonate aqueous solutions was studied. Based on the equations for the first- and second-order dissociation constants of carbonic acid, the stability constants of NaCO₃^- and NaHCO₃⁰ complexes, the mass balance and electroneutrality equations, the values of the system components and the ratio between the components of the carbonate subsystem were determined, and it was established that the main species in experimental conditions are СО₃^2-, NaСО₃^- and HСО₃^- and the main components of the carbonate subsystem are СО₃^2- (86.7%) and HСО₃^- (13.19%). Studies have shown that with a significant excess of CO₃^2- over HCO₃^- ions in the solution at temperatures of 18-20˚C, calcite and vaterite are most likely formed. During the crystallization of calcium carbonate from an aqueous carbonate solution in a magnetic field of 125-250 mT, the size of the crystallites increases significantly compared to the absence of a magnetic field.

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