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

Model Spiral diameter
(mm)
Rotation speed
(r/min)
Drive motor
(KW)
Lift motor
(KW)
Overall size
(LxWxH in mm)
Weight
(Ton)
FG-300 300 12-30 1.1 —– 3850X490X1140 0.7
FG-500 500 8-12.8 1.1 —– 5430X680X1480 1.9
FG-700 750 6-10 3 —– 6720X980X1820 3.1
FG-1000 1000 5-8 5.5 —– 7590x1240x2380 4.9
FC-1000 1000 5-8 7.5 —– 9600x1240x2680 6.2
FG-1200 1200 4-6 7.5 2.2 8180x1570x3110 8.5
FC-1200 1200 4-6 7.5 2.2 10370x1540x3920 11.0
2FG-1200 1200 4-6 7.5×2 2.2×2 8230x2790x3110 15.8
2FC-1200 1200 4-6 7.5×2 2.2×2 10370x2790x3920 17.6
FG-1500 1500 4-6 7.5 2.2 10410x1880x4080 12.5
FC-1500 1500 4-6 7.5 2.2 12670x1820x4890 16.8
2FG-1500 1500 4-6 7.5×2 2.2×2 10410x3390x4080 22.1
2FG-1500 1500 4-6 7.5×2 2.2×2 12670x3370x4890 30.7
FG-2000 2000 3.6-5.5 11-15 3 10790x2530x4490 20.5
FC-2000 2000 3.6-5.5 11-15 3 15610x2530x5340 28.5
2FG-2000 2000 3.6-5.5 (11-15)x2 3×2 11000x4600x4490 35.5
2FC-2000 2000 3.6-5.5 (11-15)x2 3×2 15760x4600x5640 48.7