Spiral Classifier

The spiral classifier is a commonly used equipment for mineral processing (sand washing). It is often paired with a ball mill to form a closed-circuit circulation to divert ore. It is also used in gravity concentrators to classify ore and fine mud, ore slurry in metal mineral processing processes, particle size classification, desliming, dehydration, and other operations in mineral washing operations. It has a long longitudinal axis installed in an inclined semicircular groove. Rotating blades are installed on the axis. The upper transmission mechanism drives the rotation. There is a spiral lifting device at the lower part.

The spiral classifier relies on the principle that the solid particles have different sizes and specific gravity and have different settling speeds in the liquid. The fine ore particles float in the water and overflow, while the coarse ore particles sink to the bottom of the tank and are pushed to the upper part by the spiral and discharged. A device for mechanical grading. It can filter the powder ground out of the mill, screw the coarse material into the feed port using a spiral blade and discharge the filtered fine material from the overflow pipe.