High efficiency dynamic separator0 pages

"

TSV : The high-efficiency dynamic classifier and its latest developments FCB-CRCM

nnTSVή : The high-efficiency dynamic classifier and its latest developments

Ph.Duhamel, A.Cordonnier and D.Lemaire FCB-Research Centre Cement and Mineral Industries CRCM >

nn1. General remarks on classifiers

The use of classifiers on a powdery product with a given grain size allows the product to be divided into two parts: the first one made up of fine particles and the second one of coarser particles. However, depending on the quality of the classifier cut, the segregation of fine and coarse particles is more or less precise. One of the traditional classifier applications is found in grinding plants for which the ground product feeds the classifier which sends the coarse part to the grinding mill inlet. This enables regularity of the finished product to be obtained in accordance with specific criteria for fineness. The performance of a grinding plant depends of course on the grinding mill used with however a significant part depending on the classifiers capabilities. The principle of separation lies in the use of centrifugal force generated by way of a flow with vortex (cyclone and derivatives, etc.) for static classifiers or a rotating turbine for dynamic classifiers. The evolution in the technology of classifiers can be summarized briefly. The first classifiers of the ғstatic type separate the coarse particles from the fine particles by a cyclone effect although limited with regard to the admissible material load for inlet as well as separation efficiency. The next generation, called first generation dynamic classifiers, has a rotating plate to disperse particles with a small axial selection turbine. Air circulation is ensured by a centrifugal rotor which is placed in the upper part. The fine product is recovered by decantation in a double conic casing. By adding an external air circuit to suck in the gas output with the fine particles instead of the integrated rotor, we have come to second generation dynamic classifiers which are traditionally installed with peripheral cyclones. The third generation includes a radial turbine which ensures radial separation and no longer axial separation. Figure 1 : Static classifier Figure 2 : First generation >
SRBII - fragmentation commitee Study day ԓDry screening and classification-28/3/1996 page 1 >

"