Dependence Of The Bond Work Index On The Filling Ratio And Test Sieve Aperture

Abstract

Knowledge of the grindability behavior of solid materials can be considered as an important factor for the design of their grindability systems. Bond work index (Wi) can be considered as one of the most important affecting factors in the design of grinding systems which indicates the value of energy (kwh) consumed per ton of the ground ore. In this research the Bond work index (Wi) was appointed using the standard Bond test and Karra's and Kapur's abbreviated algorithms for some Egyptian ores which can be used in some strategic industries such as ceramics and cement. These ores include quartz, white marble, Nephline syenite, cement clinker, kaolin, ilmenite and barite. Experiments were carried out at different ore filling ratio percentages and at different test sieve apertures. From the obtained results it was clear that, values of the Bond work index (Wi) resulted from the three mentioned methods were quite similar. It was shown also that the filling ratio affects greatly on the value of the work index. The index value increases by decreasing the test screen aperture (degree of fineness). It was recommended to identify the filling ratio and degree of fineness for appointing the work index as a prerequisite for the design of grinding systems.