Introduction of Spiral Classifier
Spiral Classifiers is art of separating the solid particles in a mixture of solids and liquid into fractions according to particle size or density by methods other than screening. In general, the products resulting, a partially drained fraction containing the coarse material, called the underflow; and a fine fraction along with the remaining portion of the liquid medium called the overflow.
The classifying operation is carried out in a pool of fluid pulp confined in a tank arranged to allow the coarse solids to settle out, whereupon they are removed by gravity, mechanical means, or induced pressure. Underflow materials will be sent back to the ball mill for re-grinding to make a close-circuit, overflow materials will come to next stage of beneficiation.
Normally, there are two types of spiral classifier, high weir type and submersion type. High weir type, the overflow spiral blade is higher than overflow level, but spiral central is lower than overflow surface. The high weir spiral classifier is applied in the classification of minerals with particle size 0.83-0.15mm. Submersion type, spirals are totally under overflow level, which is applied with particle size 0.15 to 0.07mm.
Spiral Classifier Technical Parameters
(LxWxH in mm)