Abstract
Increasing growth rate of salt crystals is essential to efficiently remove salt from brine, ensure the availability of water resources, and decrease the environmental load. This study investigated the effects of properties of microcrystals and impurities on the growth rate enhancement (GRE) phenomena by microcrystals and the product properties in suspension during evaporative crystallization. Through the experiments, it was found that the GRE was increased by adding microcrystals to the suspension using a Taylor-Couette (TC) crystallizer. Furthermore, the size of the added microcrystals significantly affected the size distribution of the obtained crystalline particles. Evaluating the ratio of crystals other than seed crystals and the GRE coefficient revealed that several ten times GRE could be achieved without deteriorating the size distribution by adding the microcrystals with single micron in size. Moreover, it was found that the GRE increased roughly four times in the presence of impurities as the growth of the microcrystals was suppressed. Consequently, it is concluded that GRE by microcrystals is increased by controlling the properties of the microcrystals and impurities, which enables the efficient removal of the salt from the feed solution.
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