mineral processing technology and mineral processing equipment

Crushing circuits - open screening • Screening ahead of a crusher avoids packing • Less wear in the crusher • Higher total capacity • The screening media is “controlling” the product in two dimensions. No “flaky shortcuts”. Crushing circuits - closed screening • The screens are lowering the capacity • Calibration of the product is improved • Better cubical shape • Higher reduction ratio Grinding circuits – screening • Used for “trapping critical sizes” in AG - SAG circuits (1) • Used for taking out size fractions from AG circuits for pebble grinding (1) • Used in circuits with heavy minerals – avoiding over grinding (fine screening) (2) • Screens being static (fixed cut point) are not too tolerant to changes in product size, causing variations in circulating loads. • Mechanical damage or clogging of screening media can disturb operation. Grinding circuits – classification • Classifiers being dynamic (floating c...