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首页> 外文期刊>Journal of Crystal Growth >A fragmentation model for crystal attrition
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A fragmentation model for crystal attrition

机译:晶体损耗的碎片模型

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摘要

In industrial crystallizers, attrition at the surface of parent crystals disperses fines into the vessel, thus influencing the crystal size distribution. Attrition occurs primarily due to collisions between particles or with the impeller or walls of the equipment. We model this phenomenon by extending our distribution kinetics model of crystal growth to include attrition and random fragmentation and investigate how the contributions of attrition, fragmentation, growth, and Ostwald ripening influence the evolution of the crystal size distribution. When the rates of both attrition and fragmentation are negligible, growth and Ostwald ripening dominate and the crystals grow continuously. When fragmentation dominates, a steady state in particle size is reached irrespective of the size of the attrition product particle. When the rates of fragmentation and attrition are comparable, evolution to steady state occurs if the attrition product crystal is larger than the critical nucleus size.
机译:在工业结晶器中,母体晶体表面的磨损将细粒分散到容器中,从而影响晶体尺寸分布。磨损的发生主要是由于颗粒之间或与设备的叶轮或壁之间的碰撞。我们通过扩展晶体生长的分布动力学模型(包括损耗和随机碎裂)来对这种现象进行建模,并研究磨损,碎裂,生长和奥斯特瓦尔德熟化的贡献如何影响晶体尺寸分布的演变。当磨损和碎裂的速率都可以忽略不计时,生长和奥斯特瓦尔德熟化占主导地位,晶体连续生长。当碎裂占优势时,无论磨损产物颗粒的大小如何,都将达到稳态。当碎裂和磨损的速率可比时,如果磨损产物晶体大于临界核尺寸,则将演化为稳态。

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