Mechanism of Fine Particle Formation in a Three-phase Reactor

近十年来，超细粉体技术推动了功能材料生产工艺的发展。微细碳酸钙（CaCO_3）是一种用途广泛的功能性填料，广泛应用于纸张涂料、油漆、聚合物等领域。三种类型的方解石颗粒，即。例如，通过改变操作条件，最终得到了菱形、圆形和细长的颗粒，研究了颗粒形状和尺寸与操作条件的关系，探讨了三种颗粒的形成机理，特别是对气泡在固液悬浮液中的作用进行了实验研究。

In the last decade, fine powder technology has advanced the process development of functional materials production. Fine calcium carbonate (CaCO_3) particles are one of the most versatile functional filler which are utilized for a wide range of products such as paper coatings, paints, polymersetc.Calcium carbonate particles are produced from precipitate in an aqueous suspension of calcium hydroxide by injecting carbon dioxide gas. Three types of calcite particles, i. e., rhombohedral, rounded and slender particles, were finally obtained by changing operation conditions.The relationship between the particle shape or size and the operation condition was investigated, and the mechanism for formation of three types of particles was discussed, especially the role of bubbles which are rising in a solid-liquid suspension was experimentally explored.