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Kinetic of potash alum crystallisation
Author(s) -
Karpinaski P.,
Nyavlt J.
Publication year - 1982
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.2170170324
Subject(s) - potash , alum , chemistry , metastability , nucleation , crystallization , thermodynamics , growth rate , mineralogy , reaction rate constant , mass transfer , analytical chemistry (journal) , kinetics , chromatography , potassium , physics , geometry , mathematics , organic chemistry , quantum mechanics
Metastable zone width of potash alum in aqueous solutions has been measured as function of the cooling rate in absence as well as in presence of seed crystals. From these data, the effective nucleation rate was calculated. Growth rate of potash alum crystals has been measured in a fluidized bed. Overall growth rate coefficient, k G , was then used for determination of the mass transfer coefficient, k D , and the rate constant of the intergration step k r . The dependence of k D on hydrodynamic conditions is discussed.