Settling behaviour of cerium oxalate particles in the solution was investigated by batch settling tests. The settling curves were experimentally generated for different overall solid fractions (OSF), initial dispersion height (h_t) and batch cylinder diameter (d). Settling curves were analysed to obtain bulk settling velocity, and it was observed that bulk settling velocity decreases with increase in OSF and remains unchanged with change in cylinder diameter. Bulk settling velocity was found more or less same with increase in initial suspension height as long as the OSF was maintained constant. The particle settling time is delayed at higher OSF due to dense particle population as the movement of one particle is affected by the presence of neighbouring particle. Regression analysis of the settling curve was performed to identify suitable mathematical model. Two parameter based model was found to represent the settling curve better in comparison to three and five parameter based models. Applicability of dispersion number for characterizing the solid–liquid suspension was checked, and it was found that the dispersion number was not unique for the solid-liquid system where it was influenced by the operating and dimensional parameters.

中文翻译：

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草酸铈颗粒在草酸-硝酸介质中沉降行为的实验研究

通过批量沉降试验研究溶液中草酸铈颗粒的沉降行为。沉降曲线是针对不同的总固体分数 ( OSF )、初始分散高度 ( _ht ) 和批料筒直径 ( d )实验生成的。分析沉降曲线以获得整体沉降速度，并且观察到整体沉降速度随着OSF的增加而降低，并且随着圆筒直径的变化保持不变。只要OSF保持恒定，散装沉降速度与初始悬浮高度的增加或多或少相同。粒子沉降时间在较高OSF时延迟由于密集的粒子群，因为一个粒子的运动受到相邻粒子的存在的影响。对沉降曲线进行回归分析以确定合适的数学模型。与基于三参数和五参数的模型相比，发现基于二参数的模型更好地表示沉降曲线。检查了分散数对表征固液悬浮液的适用性，发现分散数对于固液系统并不是唯一的，它受操作和尺寸参数的影响。