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Spiral classifier is mainly used for dressing grinding circuit, sand factory in classification and grade of inspection, in advance, and desliming, dehydration in sand washing operation etc. The machine according to the number of spiral can be divided into two single spiral and double spiral, according to the spiral blades in the overflow surface depth degree can be divided into high weir and sinking type two kinds. High weir type spiral classifier is used in the overflow particle size of 0.83 mm to 0.15 mm of ore grade, submerged spiral classifier is used in the overflow particle size from 0.15 mm to 0.15 mm of ore grade
The structure and principle of FG spiral classifier are approximately the same as the FC screw classifier. The overflow weir of FG spiral classifier is higher than the bearing center of the lower spiral shaft, but lower than the upper margin of the overflow spiral, it has a certain settlement area, so it is suitable for coarse grain washing. While the whole spiral of the fc-spiral classifier is immersed in the liquid surface of the settlement zone, the settlement area has a large area and depth, so it is suitable for fine cleaning sand.