New Process in the Solid Liquid Separation: Safe Production even with a Wide Grain Size Spectrum

摘要

It is common practice to use centrifuge dryers for solid-liquid separation. Conventional centrifuge systems will fail with certain product properties, such as a wide grain size spectrum with a large fraction of fine grains. Thanks to a new production method, it is now possible to get around these difficulties in a safe and reliable way. The known production sequence in a centrifuge dryer is as follows (Fig. 1): The suspension is filled into the filter drum through the drive shaft. In the centrifugal field, the solid material is retained by the multi-layer filter and the mother liquor passes through the product cake. In the following step, the filter cake is washed. After the washing process, centrifugation starts for mechanical dehumidification. The residual capillary rise can be reduced by applying an overpressure. In the next step, an extremely efficient and gentle thermal drying process with fixed bed drying and/or fluid bed drying starts: After dislodging the product cake - the solid particles are accumulated in a heap in the process chamber - either a stop-and-go process or a continuous process is typically used for the fluid bed drying.