タワーミル粉砕機（ＫＤ−３型機）における微粒子実収率を高めるための捕集部と分級部の改良

Abstract

In the previous studies on pulverization of limestone by a Tower Mill Pulverizer, a product containing particles finer than 10μm could be obtained using a newly developed Tower Mill KD-3. From now, the Tower Mill KD-3 needs a higher level of efficiency for its further development, that achieves a high recovery of fine particles from the pulverized products. With this purpose, a series of investigations have been carried out on different types of cyclones and classifiers to clarify the factors which could affect the recovery of pulverized particles: Single Cyclone with Spiral Ribbons (SCSR), Twin Cyclone (TC), Twin Cyclone with Spiral Ribbons (TCSR), Simple Classifying Part (SCP), Classifying Part with Inclined Sieves (CPIS).The results of these investigations can be summarized as follows:(1) An increase in the recovery of fine particles was recorded using a TCSR and a CPIS. In both cases the achieved performances are certainly due to the high air flow rate in the cyclone.(2) The relationships between the maximum particle diameters and the 50 % particle diameters of the products were approximately straight lines whatever cyclones and classifiers were used.