Abstract
Rubidium jarosite was synthesized as a single phase by precipitation from aqueous solution. X-ray diffraction and scanning electron microscopy energy-dispersive spectrometry analysis showed that the synthetic product is a solid rubidium jarosite phase formed in spherical particles with an average particle size of about 35 μm. The chemical analysis showed an approximate formula of Rb0.9432Fe3(SO4)2.1245(OH)6. The decomposition of jarosite in terms of solution pH was thermodynamically modeled using FACTSage by constructing the potential pH diagram at 298 K (25 °C). The E-pH diagram showed that the decomposition of jarosite leads to a goethite compound (FeO·OH) together with Rb+ and \( {\text{SO}}_{4}^{2 - } \) ions. The experimental Rb-jarosite decomposition was carried out in alkaline solutions with five different Ca(OH)2 concentrations. The decomposition process showed a so-called “induction period” followed by a progressive conversion period where Rb+ and \( {\text{SO}}_{4}^{2 - } \) ions formed in the aqueous solutions, whereas calcium was incorporated in the solid residue and iron gave way to goethite. The kinetic analysis showed that this process can be represented by the shrinking core chemically controlled model with a reaction order with respect to Ca(OH)2 equals 0.4342 and the calculated activation energy is 98.70 kJ mol–1.
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Notes
BECKMAN COULTER is a trademark of Beckman Coulter, Inc., Fullerton, CA.
BRUKER is a trademark of Bruker-Physik Ag, Silberstreifen, DE.
JEOL is a trademark of JEOL LTD, Tokyo, Japan.
Abbreviations
- A:
-
rate constant
- C A :
-
concentration of reactant
- C p :
-
heat capacity
- E :
-
activation energy
- G298.15 :
-
standard Gibbs free energy at 298 K (25 °C)
- ∆Gf,298.15 :
-
Gibbs free energy of formation at 298 K (25 °C)
- H 298.15 :
-
standard enthalpy at 298 K (25 °C)
- ∆H f,298.15 :
-
enthalpy of formation at 298 K (25 °C)
- Kexp :
-
experimental rate constant
- Kq :
-
chemical rate constant
- M:
-
molarity (mol L–1)
- n :
-
reaction order
- [OH–]:
-
concentration of OH– ion
- R:
-
gas constant (8.314 J mol–1K–1)
- r 0 :
-
initial radius of particle
- S 298.15 :
-
standard entropy at 298 K (25 °C)
- ∆S f,298.15 :
-
entropy of formation at 298 K (25 °C)
- T :
-
absolute temperature (K)
- t :
-
time
- V :
-
molar volume
- X S :
-
fraction of sulfur converted into product
- ρ :
-
density
- θ :
-
induction time
- v :
-
stoichiometric coefficient
- σ :
-
standard deviation
- τ :
-
time for the complete reaction of a particle
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Acknowledgments
The authors wish to thank the Academic Area of Earth Science and Materials (AACTyM) UAEH for their assistance in the laboratory work, as well as the institutions IPN, COFAA, and SNI.
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Manuscript submitted June 21, 2011.
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Perez-Labra, M., Romero-Serrano, A., Salinas-Rodriguez, E. et al. Synthesis, Thermodynamic, and Kinetics of Rubidium Jarosite Decomposition in Calcium Hydroxide Solutions. Metall Mater Trans B 43, 773–780 (2012). https://doi.org/10.1007/s11663-011-9601-7
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DOI: https://doi.org/10.1007/s11663-011-9601-7