Abstract
Cooling crystallization via hollow fiber devices emerges as a new technology suitable for salt production from concentrated seawater brine. To generate high-quality NaCl crystals, a solid hollow fiber cooling crystallization (SHFCC) system was developed in this study using lab-made PVDF hollow fibers as the heat-exchanger and magnetic stirring as the downstream mixing device. Experiments were conducted to investigate the influences of downstream agitation methods and operation parameters on crystal properties. Narrowly distributed NaCl crystals with a small size of around 35 μm were successfully produced by the SHFCC system combined with ultrasonication or magnetic stirring. Specifically, the magnetic stirring-based agitation was the most effective in facilitating crystal generation with the highest rates of nucleation and crystal salt production due to the enhanced mass transfer in the diffusion-controlled crystallization process. The influences of feed solution and stirring speed on NaCl crystal product...
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