Development of a Wet Shape Separator for Fine Particles

1 .一、简介：在功能材料的开发中，已经揭示了组成颗粒的形状是影响物质质量的最重要因素之一。因此，产品中所需形状的颗粒应进行物理分选和初步回收，以尽可能有效地使用。在这项研究中，为了分离不同形状的细颗粒，开发了一种新的连续湿式形状分离器，并使用粒径约为50- 250 μ m的不同形状的二元固体混合物测试了其分离性能。开发的湿式分离器：将球形和非球形颗粒同时进料到填充有表面活性剂的稀水溶液的分离器中的缓慢旋转的锥形盘上，并在盘下的取样器中回收。实验结果表明：（1）利用液体射流扫过旋转锥盘，可实现连续的形状分离。（2）分离器的分离效率取决于锥盘材料的表面粗糙度、颗粒的粒径、吹扫颗粒的流量、表面倾角、锥盘转速和分离器转速。（3）在适当的操作条件下，即使是50 μ m的微细混合物也能得到有效的分离。(4)A开发了在液体中使用超声波场的湿式微进料器，并且发现其对于将细颗粒进料到形状分离器是有效的。

1 . Introduction : In the development of functional materials, it has been revealed that the shape of the constituent particles is one of the most important factors affecting the quality of the matter. Desirably-shaped particles in a product, therefore, should be physically sorted and recovered preliminary to use as effectively as possible. In this study, for the purpose of separation of fine particles differing in shape, a new continuous wet shape separator was developed and its separation performance was tested using differently shaped binary solid mixtures of about 50- 250 mum in particle size.2 . Wet shape separator developed : Spherical and non-spherical particles were simultaneously fed onto a slowly rotating conical disk in the separator filled with a dilute aqueous solution of a surfactant, and were recovered in the sampler under the disk. The shape separation mechanism of particles in the separator is based on the difference in trajectories between spherical and non-spherical particles resulting from their static rolling frictional characteristics on the disk.3 .Experimental results : (1)Continuous shape separations could be performed using an operation of sweeping particles on the rotating conical disk by a jet of liquid. (2)Separation efficiencies of the separator depended on surface roughness of disk material, particle size, flow rate for sweeping particles, surface inclination angle, and rotational speed of conical disk and of separator. (3)Even the fine mixture of S0mum-sized particles could be effectively separated under the appropriate operating conditions. (4)A wet micro-feeder using the ultrasonic field in liquid was developed, and was found to be effective for feeding fine particles to the shape separator.