Spiral Classifier

Application of Spiral Classifier:

Spiral Separator has 4 types, high-dam single spiral, high-dam double spiral, submerged single spiral and submerged double spiral.

The spiral classifier overflow position shall be higher than the bearing central part of spiral bearing lower end but lower than spiral upper edge of the overflow end. There is a certain settlement region suitable for classifying rough grains to get the overflow size bigger than 100 mesh.

The spiral separator is widely used in beneficiation plants for classifying mineral sand with ball mill to form closed cycle, in gravity beneficiation plant for classifying mineral sand and fine mud, in the process of metal beneficiation for granularity classifying of ore magma and ore washing process for desliming and dewatering. It has the features of simple structure, reliable operation, and convenient operation.

Operating principle of Spiral Classifier:

The ore pulp is fed into the water trough from the feed inlet in the center of the settlement region.

The classifying settlement region is under the water trough. As the spiral rotates in low speed to stir the pulp and makes the light and fine particles suspend on the top and overflow to the edge to next processing step. On the other hand, the heavy and rough particles settle to the bottom and discharged as returning sand from discharge opening by spiral conveying.

The main structure of the high weir spiral classifier is the semicircle trough, which is made up of steel plate and profile steel. Feed outlet is on the side wall of the central trough body, returned sand outlet is on the lower part of the upper trough body, and drain valve is on the bottom of the lower trough body. Drain valve is closed at normal operation time, and the ore pulp will only be discharged from the drain valve when emergency happens. Vertical hollow shaft is installed inside the trough body, and a support shelf which is compatible with the spiral lead angle is equipped on the vertical hollow shaft. Beside, helical blades are fixed on the top, the helical system mainly adopts double-threaded uniform pitch screw, and wearable liner is equipped on the edge of blade (normally is made up of medium-manganese nodular cast iron). When the spiral is rotating, the light-fine particle are floating by agitated ore pulp, and the heavy-rough particles sunk at bottom of the trough are sent to the upper part. The hollow shaft is made up of seamless steel tube generally, or to be made by welding from long steel plates which are rolled as annular shape. Axle journals are welded at each two ends of the hollow shaft, and the upper end is supported inside the lower support. The shaft head on both sides of the supporting base is supported on the gear frame, hence the spiral axis can do the motions of both rotation and up-and-down.

Due to the bearing support of the lower part is immersed in the ore pulp for long time, good condition of sealing device is required. The machine adopts packing labyrinth type and high pressure of oil type, therefore the sealing performance is improved.

The spiral axis is transmitted by the motions of motor, speed reduction device, gear, and the transmission device is located on the upper part of the equipment. Due to the helical blade will be buried by sand setting when the machine stops, it may causes difficult machine starting, spiral lifting gear is equipped necessarily. On the other hand, the motor via speed reduction device and the gear drive the lead screw so that the axle can be lifted and do up-and-down motions.

Delivery of spiral Separator:

Technical Parameters of spiral Separator: