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Topic: What is a good design for a stirred tank mixer?

anonymous
We manufacture epoxy products with stirred tanks. We blend the resin and hardener separately. What is a good design for a stirred tank mixer and what are the power requirements? The viscosity is between 2,500-5,000 cp, the volume is 2,000 liters, the dimensions of the tank are 1.5 meters in diameter and the height is 2.5 meters.
  • Avatar Dave Dickey Forum Moderator 283 Posts

    Re: What is a good design for a stirred tank mixer?

    For blending the two liquids described, a vertical, center-mounted mixer with two (2), 0.5 meter diameter, four-blade, 45-degree, pitched-blade impellers operating at 125 rpm with a 1.5 KW motor, should be sufficient.

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  • Avatar Chanelle Singh Community Member 1 Post

    Re: What is a good design for a stirred tank mixer?

    Good day, What sort of mixing would you advise for dissolving powder that has an insoluble component of 0.5%. I would also like guidance on liquid level/tank height ratios that will allow for the most effective mixng to be achieved.
  • Avatar Dave Dickey Forum Moderator 283 Posts

    Re: What is a good design for a stirred tank mixer?

    Dissolving a powder depends on the same variables as those in the laboratory, particle size and solubility being the most important.  The mixer design should achieve at least off-bottom suspension of the particles, which depends on particle size, density, and concentration.  Wetting powders at the surface may be the most difficult step in dissolving powders and requires effective surface motion.

    The liquid level to tank height ratio should be near one (1:1) for most effective mixing.