- AutorIn
- Georgia Wollmann
- Titel
- Crystallization Fields of Polyhalite and its Heavy Metal Analogues
- Zitierfähige Url:
- https://nbn-resolving.org/urn:nbn:de:bsz:105-qucosa-32906
- Übersetzter Titel (DE)
- Existenzgebiete des Polyhalits und seiner schwermetallhaltigen Analoga
- Datum der Einreichung
- 10.10.2009
- Datum der Verteidigung
- 05.03.2010
- Abstract (EN)
- Polyhalite is an abundant distributed mineral in rock salt formations, and considered to respond as a natural heavy metal sink because the Mg2+ ion can be substituted by other bivalent metal ions like Mn2+, Co2+, Ni2+, Cu2+ and Zn2+. One of the quantities needed to predict mineral solubilities in multi-electrolyte solutions is the solubility constant Ksol. Since polyhalite forms slowly over months or years at 298 K, the solid-liquid phase equilibria experiments were accomplished at 313 K. Enthalpies of dissolution were measured and used to extrapolate lnKsol from 313 K to 298 K. Pitzer’s equations have been applied to describe activities of solute and water, with Pitzer parameters estimated from experimental data. The solubility constants for the polyhalites were applied to calculate the solubility equilibria in the quaternary systems K+, M2+, Ca2+ / SO42- // H2O (M = Mg, Mn, Co, Cu, Zn) at 298 K and 313 K, and in case of Mg-polyhalite also in the hexary system Na+, K+, Mg2+, Ca2+ / Cl-, SO42- // H2O.
- Freie Schlagwörter (DE)
- Polyhalit, Leightonit, Löslichkeit, Löslichkeitskonstante, Lösungsenthalpie, Phasengeichgewichte, ozeanisches System
- Freie Schlagwörter (EN)
- polyhalite, leightonite, solubility, solubility constant, enthalpy of dissolution, phase equilibria, oceanic system
- Klassifikation (DDC)
- 540
- Klassifikation (RVK)
- UQ 2140, UQ 3300
- GutachterIn
- Prof. Dr. Wolfgang Voigt
- Prof. Dr. Axel König
- BetreuerIn
- Prof. Dr. Wolfgang Voigt
- Den akademischen Grad verleihende / prüfende Institution
- TU Bergakademie Freiberg, Freiberg
- Förder- / Projektangaben
- URN Qucosa
- urn:nbn:de:bsz:105-qucosa-32906
- Veröffentlichungsdatum Qucosa
- 14.05.2010
- Dokumenttyp
- Dissertation
- Sprache des Dokumentes
- Englisch