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|The fishhook effect, wherein the recovery of fine particles in the underflow increases with decreasing particle size, has been observed in hydrocyclone classification. A systematic study was carried out to determine the factors affecting the recovery of very fine particles to the underflow. Attempts were made to identify factors, i.e., design and operating variables, that affect the size at which this phenomenon occurs. Experimental results show that the sizes at which the fishhook effect occurs is mainly a function of feed size distribution and solids concentration and is less dependent on the design variables.|