Spiral Classifier

According to the height of the overflow weir, the position of the spiral in the water tank is different from the height of the slurry surface, the spiral classifier can be divided into three types: high weir type, low weir type and submerged type.

High weir type spiral classifier. The overflow weir position of the high weir type spiral classifier is usually higher than the bearing center at the lower end of the screw shaft, and lower than the upper edge of the overflow end spiral, so the area of the settlement area is larger than that of the low weir type spiral classifier, and the weir height is also higher. It can be adjusted within a certain range, that is, the area of the sedimentation zone can be slightly changed according to the classification requirements, so as to adjust the classification particle size.

Low weir type spiral classifier. The overflow weir of the low-weir spiral classifier is often lower than the center of the bearing at the overflow end, so the area of the settlement area is too small. The overflow production capacity is too low, and the agitation of the spiral to the slurry surface is large, so in actual production only It is used for flushing sand ore with little mud content and dehydration of coarse particles, and is rarely used in grading process.

Submerged spiral classifier. The overflow end of the submerged spiral classifier generally has 4-5 turns of spiral blades, and all the spiral blades are submerged under the liquid level in the settling area, so the area of the settling area is large and the classification pool is deep.

Due to the difference in structure between the high weir type and the submerged spiral classifier, their functions are also different. The high-weir spiral classifier is more suitable for separating coarse grains larger than 0.15mm, and is often used in the first stage of grinding; while the submerged spiral classifier has a stable classification surface, high overflow output, and fine particle size. Therefore, it is more suitable for separating overflow products with a particle size of less than 0.15mm, and it is often combined with the grinding machine in the second stage of grinding.