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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.