Add time:07/22/2019         Source:sciencedirect.com

The presence of impurities in a system can drastically affect the growth rates of crystals grown from solutions. In this study, growth experiments with tetrahydrate sodium perborate (SPB) crystals in the presence of additives have been performed in a batch fluidized bed crystallizer. First, it has been shown that sodium metaborate (SMB) affects the solubility of SPB, reducing it at low concentration and increasing it at high concentration. Related to this, it also modifies the growth rate of SPB crystals. The effect of various kinds of mineral additives, surfactants and a polymer on growth rate has also been investigated. The retarding action observed in the presence of some of these additives has been interpreted in terms of a Langmuir-type adsorption isotherm. The apparent accelerating effect on growth rate obtained with aluminium sulfate and cetyltrimethyl ammonium bromide, a cationic surfactant, was supposed to be related to an enhancement of nucleation and agglomeration processes.

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