Premium
Precipitation of Strontium Sulphate
Author(s) -
Sühnel Otakar,
Handlířová Marie
Publication year - 1984
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170190407
Subject(s) - supersaturation , nucleation , precipitation , aqueous solution , strontium , slurry , crystal growth , chemical engineering , chemistry , induction period , materials science , mineralogy , crystallography , catalysis , meteorology , organic chemistry , physics , engineering , composite material
Precipitation of unseeded supersaturated aqueous solutions of SrSO 4 and growth of SrSO 4 crystals at the size of approximately 20 μm were studied. Within the examined range of supersaturations, i.e. S a < 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 SrSO 4 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.