55 research outputs found
Kinetics of conversion of celestite to strontium carbonate in solutions containing carbonate, bicarbonate and ammonium ions and dissolved ammonia
Celestite concentrate (SrSO4) has been converted to SrCO3 in solutions
containing CO32-, HCO3- and NH4+ ions and dissolved ammonia. The effects of
stirring speed, CO32- ion concentration; temperature and particle size of
SrSO4 on the reaction rate were investigated. It was found that the
conversion of SrSO4 was increased by increasing the temperature and
decreasing the particle size, while the reaction rate was decreased with
increasing the CO32- ion concentration. However, there was no effect of the
stirring speed on the reaction rate. The conversion reaction was under
chemical reaction control and the Shrinking Core Model was suitable to
explain the reaction kinetics. The activation energy for the conversion
reaction was found to be 41.9 kJ mol-1. The amounts of the elements in the
reaction solution were determined quantitatively by inductively coupled
plasma-optical emission spectrometry. The characterization of the solid
reactant and product was made using scanning electron microscopy-energy
dispersive spectrometry and X-ray powder diffraction analytical techniques
The conversion of celestite to SrCO3 in ammoniacal solution containing ammonium carbonate/bicarbonate
Selestit’in Amonyum Karbonat/Bikarbonat İçeren Amonyaklı Çözeltilerde SrCO3’ a Dönüştürülmesi
Conversion of Strontium Sulfate to Strontium Oxalate in Solutions Containing Ammonium Oxalate as a Reactant
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