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Crystallization of Calcium Sulfate Dihydrate from Phosphoric Acid
Author(s) -
Jamialahmadi M.,
MüllerSteinhagen H.
Publication year - 2000
Publication title -
developments in chemical engineering and mineral processing
Language(s) - English
Resource type - Journals
eISSN - 1932-2143
pISSN - 0969-1855
DOI - 10.1002/apj.5500080510
Subject(s) - phosphoric acid , supersaturation , crystallization , nucleation , activation energy , chemistry , seed crystal , arrhenius equation , reaction rate constant , calcium , inorganic chemistry , sulfate , crystal growth , triglycine sulfate , chemical engineering , materials science , kinetics , crystallography , single crystal , organic chemistry , optoelectronics , dielectric , ferroelectricity , physics , quantum mechanics , engineering
Knowledge of the kinetics of calcium sulfate dihydrate crystallization from phosphoric acid solutions is essential for design and operation of the dihydrate process, which is frequently used in fertilizer industries for the production of phosphoric acid A continuous crystallizer was used to investigate the effect of operating parameters on nucleation and growth rates, and ultimately on the crystal size distribution of calcium sulfate dihydrate. It is shown that growth rate increases with the square of supersaturation and that the effect of temperature on the growth rate constant follows an Arrhenius relationship with an activation energy of 65.2 kJ/mol. The predictions of the suggested kinetic models are verified against plant data.