Abstract
The paper contains the results of our previous investigations on the crystallization of ZnC 2O 4 · 2H 2O and a more detailed study of the behaviour of the solid phase based on the evolution of the crystal size distribution during the process. The overall supersaturation range (2.9 ⪕ S ⪕ 100) consists of three subranges which are characterized by different combinations of the elementary crystallization processes: (a) rapid growth of heterogeneous primary crystals accompanied by secondary processes (breaking and secondary nucleation) at low supersaturations ( S ⪕ 4 at pH = 2 and S ⪕ 20 at pH = 5); (b) molecular growth of primary crystals at medium supersaturations; (c) coagulation growth of homogeneous primary crystals followed by “pulsing” and formation of crystalline “coagulates” at high supersaturations ( S ⪖ 14 at pH = 2 and S ⪖ 75 at pH = 5).
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