Effect of Taylor Vortex Flow on Powder Properties in a Synthesis Process of Hydrocalumite from Simulated Seawater

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In this study, in order to develop a method for the mass production of hydrocalumite （HC） with desired powder properties from concentrated seawater discharged from salt manufacturing processes in Japan, a Taylor vortex accelerating mass transfer was utilized for the continuous crystallization of HC. For adding the functionality of HC, the control of powder properties such as crystallinity, particle size distribution, and trivalent cation ratio in HC during the crystallization process are indispensable. Application of the Taylor vortex generates large supersaturation regions because of the acceleration of mass transfer caused by multiple vortex flows in the gap between coaxial cylinders. Hence, the continuous crystallization of HC particles with desired powder properties can be expected. In the present experiments, HC was crystallized by continuously feeding solutions contained two kind of metal ions, Ca2+ and Al3+, and a NaOH solution into the Taylor vortex crystallizer. As the operation parameters, the concentration of Ca2+ in the solution and the rotating speed of the inner cylinder of the Taylor vortex crystallizer were varied in order to change the supersaturation state in the crystallizer. Consequently, during the crystallization of HC, the crystallinity of HC exhibited a maximum value at the Ca2+ concentration and rotating speed owing to the formation of higher supersaturation regions. Based on nucleation and growth mechanism, the fine particles with narrower size distribution crystallized due to homogeneous concentration regions.

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