Abstract: The new concept "high efficient extraction and clarification tanks with double stirring" was put forward， that is， inserting a stirring unit in the clarifying chamber. By choosing an appropriate stirring condition， the separation rate of the aqueous phase and the organic phase was improved in the clarification extraction process， which increased the efficiency of the extraction equipment. A double stirring water model experimental device was designed and produced in this project. By means of cold state simulation， the influences of centrifugal field coupling with the gravity field on the separation of the oil and water phases in the extraction tank were studied under the different stirring conditions. Finally， combining with the experiment data， the dimensional analysis method was adopted. The dimensionless equation between the clarity under the open type 45 degrees of turbine blades and the stirring speed， distance from the bottom， the distance from the overflow entrance to the stirring blades was established. The experiments showed that the calculations are in good agreement with the experimental values.

Key words: extraction and clarification tanks, double stirring, clarity, dimensional analysis, physical simulation