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首页> 外文期刊>Crystal Research and Technology: Journal of Experimental and Industrial Crystallography >Rate of sodium chloride attrition fragment generation in a mixed-suspension crystallizer
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Rate of sodium chloride attrition fragment generation in a mixed-suspension crystallizer

机译:混合悬浮结晶器中氯化钠磨损碎片的产生速率

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摘要

Attrition of crystals in industrial crystallization is the major source of secondary nucleation and has strong effects on product quality. This work describes attrition in industrial crystallizers using an empirical engineering model based on dimensionless groups describing crystal properties, suspension properties, and crystallizer geometry and operating conditions. Here the attrition rate of sodium chloride crystals in a small scale mixed-suspension crystallizer is studied, varying the following parameters: impeller speed, parent crystal size, suspension density, draft-tube impeller clearance, off-bottom impeller clearance, impeller type, and impeller material. It was found that the attrition rate depends on most of the variables investigated. The direction of the dependence is predictable based on intuitive modeling. An empirical power law model based on dimensionless groups predicted by Buckingham-Pi theory (using variables mentioned above) gives a good fit to the data.
机译:工业结晶中的晶体损耗是二次成核的主要来源,并且对产品质量有很大影响。这项工作使用经验工程模型描述工业结晶器中的损耗,该模型基于描述晶体特性,悬浮特性以及结晶器几何形状和操作条件的无因次基团。在这里研究了小型混合悬浮结晶器中氯化钠晶体的磨损率,改变了以下参数:叶轮速度,母体晶体尺寸,悬浮液密度,尾管叶轮间隙,底部叶轮间隙,叶轮类型和叶轮材料。发现损耗率取决于所研究的大多数变量。依赖的方向是基于直观建模可预测的。基于白金汉-皮理论(使用上述变量)预测的基于无量纲组的经验幂定律模型可以很好地拟合数据。

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