Abstract
Pump-mix mixers, widely used in rare earth extraction, are quite different from stirred tanks in their suction effect. The effects of impeller type, diameter, clearance, blade width, blade number, orifice diameter, orifice height and liquid flow rate at different impeller speeds on the head generated by a rotational impeller have been studied. Results show that Both sides Shrouded Turbine with Radial Trapezoidal Blade (BSTRTB) has the best performance for suction. Clearance and orifice height affect the suction head largely. At a large clearance and orifice height, the phenomenon of double recirculation loop flow pattern is observed with weak suction head and high power consumption. Further discussion of pump-mix action was then carried out on the flow pattern and the results show that a large amount of liquid in the low recirculation loop flows to the impeller and results in high power consumption and low head.
