Deflector wheel classifier with a high sharpness of cut for the classification of submicron particles at high loadings with integrated material sorting

工业相关粉末量的干式分级主要是在细颗粒范围内由反折轮分离器进行的，即使在高负载下也能提供几微米的切割尺寸。在本项目中，旨在进一步降低切割尺寸，同时提高切割的锋利度，并将细颗粒范围内的空气动力学分类与基于摩擦带电的材料特定分选相结合。在第一阶段，一个新的高速分级机和一个新的旋转分选设备的建设和特点，以及颗粒运动和摩擦带电的理解得到了改善，这应该在剩下的一年内进一步深化。在第二阶段，将建立一个具有高度分类和分选灵敏度的连续过程。为此，特别是双极摩擦带电的机制，甚至在相同材料的给定尺寸等级内发生，需要以可以实现根据尺寸和材料的多维分离的方式来阐明和技术处理。

The dry classification of industrially relevant powder quantities is dominated in the fine particles range by the decflection wheel separator, which provides even at high loadings cut sizes of a few microns. In the present project, it is intended to shift the cut size further down, increasing the sharpness of cut at the same time, and to combine the aerodynamic classification in the fine particle range with a material specific sorting based on the triboelectric charging. In the first period, a new high speed classifier and a novel rotational sorting apparatus were constructed and characterized as well as the understanding of the particle motion and the triboelectric charging was improved, which should be further deepened within the remaining year. In the second period, a continuous process with high classification and sorting sharpness will be established. To do so, in particular the mechanism of bipolar triboelectric charging, which even occurs within a given size class of the same material, needs to be elucidated and technically treated in a way that a multidimensional separation according to size and material can be realized.