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Crystallization of glaserite from aqueous solutions
Author(s) -
Mazzarotta B.
Publication year - 1990
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.2170250810
Subject(s) - dissolution , solubility , crystallization , metastability , precipitation , aqueous solution , chemistry , salt (chemistry) , potassium , diffusion , mother liquor , sodium , analytical chemistry (journal) , thermodynamics , mineralogy , chromatography , organic chemistry , physics , meteorology
Crystallization of glaserite (double salt of potassium and sodium sulphate) from aqueous solutions was studied by determining solubility, metastable zone width, growth and dissolution kinetics. Solubility measurements confirmed the presence of a large range of mother liquor compositions from which the precipitation of glaserite at about 73 – 76 wt% K 2 SO 4 is obtained: inside this region the solubility lines resulted curvilinear. The metastability zone is quite large, ranging from 14 to 23 °C, and mainly increases by increasing the Na 2 SO 4 content in the mother liquor. The growth rate of glaserite is second order, slightly size dependent and primarily controlled by diffusion as for K 2 SO 4 but both growth and dissolution constants are quite lower than those for K 2 SO 4 .