Laboratory testing the grindability of carbonate mineral raw material of the site Spasina Brdjani: Chalk samples

Abstract

This work presents the results of the Bond work index in a ball mill on samples of carbonate mineral raw material (chalk) of the site Spasina - Brdjani. Determination of the Bond Work Index was carried out on total of six samples of chalk from different exploration drill holes, as well as two samples of chalk from the exploration trenches. Comparing the results, it was found that in most cases the value of the Bond Work Index is between 2 and 3 Deviations, which means slightly higher values of Bond work index, were achieved in samples where the presence of alevrolyte interlayers was observed as well as a large concentration of calcified fossils. Very low value of the Bond Work Index 1,520 kWh/t was determined in chalk samples with high content of soft silty clayey component.

Keywords

• bond work index
• chalk