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Supersaturation and crystal size distribution changes during the precipitation of Nickel ammonium sulphate hexahydrate
Author(s) -
Mullin J. W.,
Ang H.M.,
Ang H.M.
Publication year - 1977
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.19770120202
Subject(s) - supersaturation , crystallization , precipitation , crystal (programming language) , nickel , salt (chemistry) , aqueous solution , ammonium , chemistry , yield (engineering) , ammonium sulfate , materials science , inorganic chemistry , chromatography , metallurgy , meteorology , organic chemistry , physics , computer science , programming language
The desupersaturation of nickel ammonium sulphate aqueous solutions, during the precipitation of the hydrated salt, has been followed by refractive index measurements. The addition of seed crystals has a considerable effect on the desupersaturation process: the induction and latent periods and the crystal size distribution are all greatly reduced. The precipitated crystal size follows V . W EIMARN'S rules, viz, the median size (a) passes through a maximum with increasing supersaturation for a given crystallization time, and (b) decreases with increasing supersaturation, for precipitations which have virtually ceased. The crystal yield increases with both supersaturation and time, but the size distribution remains fairly constant with time for supersaturations, S > 2.