Rotary spiral chute combines the characteristics of spiral concentrator, shaking, centrifugal concentrator is dressing plant for production and scientific research of the model of gravity concentration equipment of. In a deeper theory to the practice of speaking, than the ordinary screw slip re-election machine more than a "function" is defined as the center with a low speed, through the experimental study and production practice proof against the pulp flow direction (counterclockwise) favorable in improving the condition of spiral surface upflow membrane and enhance the recovery of useful minerals, the subject is aiming at the intersection of the membrane of the inner layer and the outer edge of the turbulence in the middle region of the laminar flow and turbulent flow spiral flow -- quite the secondary flow in the middle of the "zero" position. It is the center of the speed to adjust to play a certain role. So it is generally better than the ordinary gravity recovery of fine machine. The device has the advantages of high concentration ratio, high recovery rate, small occupation area, less water consumption, convenient operation and strong adaptability. Another with frequency conversion control system, can adjust the speed of equipment, in order to achieve the best effect of mineral processing.