Hydrocyclones are used for various classification purposes in the mining and minerals processing industries. Hydrocyclones are applicable in dividing the feed solids continuously into fine (overflow) and coarse (underflow) fractions, which opens great possibilities for their use for two main purposes: pretreatment of slurry prior to filtration, to enable cost-effective filtration of the coarse underflow fraction with vacuum filters, and concentrating the valuable components present in ores