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Cadmium Incorporation in the Crystallization of Calcium Sulfate Hemihydrate from Phosphoric Acid
Author(s) -
Tjioe T. T.,
Van Woude H. Der,
Verbiest J.,
Durville P. F. M.,
van Rosmalen G. M.
Publication year - 1986
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.2170211009
Subject(s) - phosphoric acid , cadmium , crystallization , chemistry , phosphate , hemihydrate , calcium , inorganic chemistry , nuclear chemistry , iodide , sulfate , materials science , organic chemistry , gypsum , metallurgy
Semi‐batch crystallization experiments of CaSO 4 · 1/2H 2 O(HH) were performed in concentrated phosphoric acid at various H 2 SO 4 contents in the absence and presence of additives. The influence of the operating conditions and additives on the cadmium and phosphate incorporation in the HH lattice were determined. The Cd uptake increased with raising H 2 SO 4 content. Addition of HNO 3 caused a reduced cadmium and phosphate incorporation. Addition of iodide also lowered the cadmium incorporation. The obtained results fits into a model for the incorporation of foreign ions during crystal growth. According to this model the incorporation is primarily a kinetically controlled process.