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Spiral classifiers suitable for dewatering,de-medium,desliming and wet and dry classifying in mine.This machine is mainly used in the production flow of metal processing,according to the difference in sedimentation rate of mineral particles and mud,the ore with particle size 14-325 meshes can be classified,it also can separate waste mud or dewatering for the ore.According to liquid level the spiral classifier can be divided into high weir type and submersion(or sinking)type,The overflow weir of high weir classifier is higher than the center of the spiral axis at lower end,but lower than the upper edge of the spiral blade.The length of liquid level is short,so its surface can directly gets the stirring effect by the spiral blade,therefore it suitable for coarse particle classification,usually the classified particle size is over 0.15mm.The spiral blade of submersion classifier at lower end completely submerged under the liquid level,the classifying area is big and smooth,suitable for classification for fine particle which is less than 0.15mm,its overflow productivity is higher.