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Rock Gold Spiral Classifier Grinding Closed Circuit. Fluctuations in feed rate and pulp density have little effect on the overflow particle size, so the classification size remains relatively stable. In addition to particle size classification, it also offers functions for washing, desliming, and slurry dewatering, which can reduce the need for downstream equipment. The unit price of the equipment is low. It does not require supporting slurry pumps, valves, or automatic control systems, so the initial investment is significantly lower than that of a hydrocyclone. It has strong processing capability for high-density slurries containing coarse particles and is not prone to clogging.