Abstract
ABSTRACT An analysis is made of the way in which particles are captured and stressed in the Bond Grindability test (ores, cement clinker) and the Hardgrove Grindability lest (coals). The deficiencies of the test results for scale-up to full-scale mills and pulverizers are illustrated by experimental data, and some alternative test procedures are suggested. The concepts are extended to the tests developed for scale-up of grinding in high pressure grinding rolls, and comparisons are made. It is accepted that these standard tests of long standing are useful because of empirical correlations to observed experience, but their limitations must be understood. The Bond Work Index (Wi) and the Hardgrove Grindability Index (HGI) are poorly correlated, but a good correlation is obtained if the Bond test values are obtained from a Bond mill fitted with lifters.
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