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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

Kinetics of conversion of celestite to strontium carbonate in solutions containing carbonate, bicarbonate and ammonium ions and dissolved ammonia