Single-stage mixers

Figure 12-96 illustrates a single-stage dryer employing a paddle mixer, recycle, and an ABB Raymond cage mill for tine grinding and... 

In continuous flow operations, a slurry is continuously added and withdrawn from a single-stage mixer. Progressive buildup must not occur in fillets, and the discharge composition to the mixer must equal the inlet composition. Discharge from the tank occurs at a particular draw-off point, the only point in the tank that requires the mixture to have the same composition as the inlet. 

Fig. 22. Rotor designs for (a) single-stage and (b) two-stage continuous internal mixers [147]...

Fig 10.3 Flow diagram for the single-stage mixer settler. 

Fig. 10.6 The single-stage FCM. (a) Size 15 FCM with chamber opened and rotated hydraulically (b) top view of staged apex twin rotors and the axial zones for carrying out the solids feed handling and the melting and mixing elementary steps (c) cross-sectional view of two rotor orientations, tip-to-tip (cx) and tip-to-flat (c2). [Reprinted by permission from E. L. Canedo and L. N. Valsamis, Farrel Continuous Mixer Systems for Plastics Compounding, in Plastics Compounding—Equipment and Processing, D. B. Todd, Ed., Hanser, Munich, 1998.]...

Figure 1. Single stage mixer-settler module [2]...

Due to the good performance of the single stage unit (see section 3) an extraction plant has been designed and built for pressures up to 30 MPa and temperatures up to 120 °C. The apparatus consists of five mixer-settler modules, as described above, which are composed in counter current flow (fig. 2). 

Other important features in assessing industrial extractions are whether one or more extraction stages are to be used. This will depend in part on the partition coefficient of the system of interest, and on the flow pattern of the solvent and extracted phase (the raffinate) to be used, if more than one extraction stage is employed. Single-stage extraction requires a mixer to bring about intimate contact between the two phases, followed by a settler which allows phase separation and a means for independent removal of the two phases (Fig. 10.7). 

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