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On the optimization of the crystallization related to an aqueous copper sulfate (CuSO4.5H2O)

ABSTRACT Two main parameters of cooling conditions and anti-solvent (ethanol) were significant in the size and shape of the copper sulfate crystals, the feedstock solution of which was produced with the high-pure, copper cathode. In the slow cooling crystallization, increasing cooling time from 30 to 60 min increased the average size of the crystals from 87 μm (30 min) to 145 μm (60 min). On the contrary, in the fast one, no change in the crystal sizes was observed in the same time range. In the presence of ethanol, the average size of the crystals declined. Finally, based on the crystallization kinetics model, it was concluded that enhancing the super-saturation led to increasing the average rate of crystal growth. Also, the addition of the anti-solvent resulted in the declined average size of the crystals. The crystallization kinetics indicated that enhancing the super-saturation led to increased average rate of crystal growth.