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首页> 外文期刊>Crystal growth & design >Analysis of Nonideal Shape Evolution during Potash Alum Crystallization Using Microcomputed Tomography and Three-Dimensional Image Analysis
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Analysis of Nonideal Shape Evolution during Potash Alum Crystallization Using Microcomputed Tomography and Three-Dimensional Image Analysis

机译：微型断层扫描和三维图像分析钾矾结晶期间非膜状演化分析

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摘要

Nowadays, it is common to analyze crystallization processes and crystalline products using two-dimensional image analysis. Various techniques exist but they are not fundamentally capable of capturing the full morphology of particles due to their limitation in two dimensions. This is particularly true when complex shapes, e.g., through agglomeration or broken crystals, occur. Here, an approach is presented in which potash alum crystals are sampled from a laboratory-scale reactor at six time points over the course of a crystallization process. Three-dimensional (3D) images of all crystals in the samples were obtained by microcomputed tomography and used for morphological characterization. The method directly yields volume and surface area distributions without the need for any assumption regarding particle morphology. Applying geometric crystal models allowed for a more detailed analysis of the crystals. In the example considered, it was shown that most crystals assumed nonideal shapes over the course of the process. The supporting model provides indication that the shapes approach ideality through face-independent crystal growth. Overall, more than 11?000 crystals were analyzed. In general, this work aims at demonstrating the potential of crystal analysis by means of microcomputed tomography and 3D image analysis.
机译：如今，使用二维图像分析来分析结晶过程和结晶产物是很常见的。存在各种技术，但由于其在二维中的局限性，它们基本上无法捕获粒子的完整形态。当出现复杂形状时尤其如此，例如通过凝聚或破碎的晶体。本文介绍了一种方法，即在结晶过程中的六个时间点，从实验室规模的反应器中对钾明矾晶体进行取样。通过微计算机断层扫描获得样品中所有晶体的三维（3D）图像，并用于形态学表征。该方法直接产生体积和表面积分布，无需任何关于颗粒形态的假设。应用几何晶体模型可以对晶体进行更详细的分析。在所考虑的例子中，大多数晶体在整个过程中呈现出非理想形状。支持模型表明，形状通过与面无关的晶体生长接近理想。总的来说，超过11个？分析了1000个晶体。总的来说，这项工作旨在通过微计算机断层扫描和三维图像分析来展示晶体分析的潜力。

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