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Anchor mixers are among the more common types of high-viscosity liquid mixers. They are used for liquid viscosities between 5000 and 50,000 cP.
The swing diameter of the anchor is generally 90 to 95% of the mixing vessel resulting in low clearance between the impeller and the internal wall of the vessel.
Anchor impellers are preferred when heat transfer through a jacket is desired along with good mixing.
Scraper arrangements or wipers may be provided to remove material deposited on internal walls of the vessel, further improving the transfer of heat.
Anchors are commonly used in crystallization reactors.
Speeds range from approximately 5.5 to 45 rpm
Impeller diameters range from 600 to 3000 mm. An anchor impeller is shown in Fig.