A REFLUX™ Classifier was used to classify a silica feed (0–710 µm) based on particle size. Split Fluidisation was used to generate remarkably sharp separations involving solids throughputs of up to 92 t/m2/h. This work builds on the previous study by Starrett and Galvin (2023) but with a focus on coarser separations at higher throughputs. As the separation size increased, there was increasing misplacement of fine particles in excess of 75 µm into the coarse underflow stream. This problem was averted by halving the cross-sectional area of the lower section of the REFLUX™ Classifier. This change led to a doubling of the superficial fluid velocity in the lower section for a given set of flow rates, ensuring fine particles were unable to settle into the coarse underflow. In general, the separations performed in this study show complete closure of the partition curve at both the coarse and fine ends. It was also found that to deliver sharp separations it is essential to introduce sufficient water to the separator, per unit of solids transport to the overflow, especially for higher solids throughputs with coarser separations. Although the fluidisation rate can be used to control the separation size at finer separations (below 180 µm) and lower throughputs, ultimately the bias flux provides the basis for controlling the separation size at coarser sizes and higher throughputs.

中文翻译：

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斜通道在矿物按粒度进行流体动力学分类中的应用 – 扩展到较粗的分离


使用 REFLUX™ 分类器根据颗粒大小对二氧化硅进料 （0–710 μm） 进行分类。分流流化技术用于产生非常尖锐的分离，涉及高达 92 t/m2/h 的固体吞吐量。这项工作建立在 Starrett 和 Galvin （2023） 之前的研究之上，但重点是在更高通量下进行较粗的分离。随着分离粒径的增加，超过 75 μm 的细颗粒误入粗底流的情况越来越多。通过将 REFLUX™ 分类器下部的横截面积减半，避免了这个问题。这种变化导致在给定的一组流速下，下部的表层流体速度增加了一倍，从而确保细颗粒无法沉降到粗大的底流中。一般来说，本研究中进行的分离显示粗端和细端的分配曲线完全闭合。研究还发现，为了实现清晰的分离，必须向分离器中引入足够的水，每单位的固体输送到溢流口，特别是对于较高的固体吞吐量和较粗的分离。尽管流化速率可用于控制较细分离（低于 180 μm）和较低通量的分离粒度，但最终偏压通量为控制较粗粒径和较高通量的分离粒度提供了基础。