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Kinetics of precipitation of nickel ammonium sulphate hexahydrate from aqueous solutions
Author(s) -
Söhnel O.,
Mullin J. W.
Publication year - 1979
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19790140215
Subject(s) - supersaturation , nucleation , aqueous solution , precipitation , ammonium , nickel , chemistry , induction period , crystal (programming language) , inorganic chemistry , crystal growth , ammonium sulfate , chemical engineering , crystallography , chromatography , catalysis , organic chemistry , meteorology , physics , computer science , programming language , engineering
The precipitation of nickel ammonium sulphate [Ni(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O] prepared by mixing of equimolar aqueous solutions of (NH 4 ) 2 SO 4 and NiSO 4 has been studied at 25 °C. Precipitation induction periods and the number of crystals formed per unit volume have been determined experimentally as functions of supersaturation for values of S a, H < 2.6. The mechanisms of nucleation and crystal growth are assessed by comparing the experimental results with theoretical predictions. In this system, heterogeneous nucleation and crystal growth are assessed by comparing the experimental results with theoretical predictions. In this system, heterogeneous nucleation appears to operate at S a, H < 1.3, whereas at S a, H > 1.6 crystals are generated predominantly by homogeneous nucleation and grow by a polynuclear mechanism. The interfacial tension of nickel ammonium sulphate crystals in contact with their supersaturated solution is estimated to be about 20 mJ/ m 2 .