I have a tank that is 5 meters in diameter and 7.5 meters tall. The bottom is flat. The liquid is water. The solid is small metal oxide particles that are very easy to suspend. Settling time is more than minutes. Would like to build a mixer for suspension only (not vigorous mixing). Question: 1. What mixer diameter do I need? 2. What RPM? 3. What shaft diameter needed? 4. What HP do I need? 5. Do I need bottom shaft support and bearing?
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Dave Dickey Forum Moderator 286 Posts
Re: Can you suggest a mixer for minimal suspension of slowly settling particles?1 July 2010 at 1:29pmIf 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.