Abstract
AbstractPrecipitation of unseeded supersaturated aqueous solutions of SrSO4 and growth of SrSO4 crystals at the size of approximately 20 μm were studied. Within the examined range of supersaturations, i.e. Sa < 16, the nucleation in aqueous solutions is controlled by the heterogeneous nucleation mechanism. The induction period of precipitation depends on the rates of both the nucleation and growth of the formed nuclei. The growth of SrSO4 crystals in supersaturated solutions at S ⪅ 5.6 is of the 2nd order with respect to the concentration and at temperatures 25 ÷ 45°C the process is controlled by the surface reaction mechanism. The number of crystals in the precipitated slurry is decreasing rapidly as a result of the Ostwald maturing.
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