If all that is needed is minimal suspension of slowly settling particles, the following mixer should be sufficient for a 5.0 m diameter vessel with a 7.5 m height and four vertical baffles to prevent uncontrolled swirling. A 1.25 m diameter pitched-blade impeller with 45 degree angled blades and rotating at 45 rpm should be sufficient. The impeller power will be about 1.8 kW, so a 3.75 kW motor is recommended. If the shaft does not have a bottom support, it needs to be 89 mm in diameter. If it has a bottom support, the shaft diameter can be reduced to 51 mm.
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