الفهرس 
Investigating the surface changes under different grinding conditions and their impact on oil shale flotation
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Abstract
Oil shale surface sensitivity is one of the challenging problems. Therefore, the oil shale breakage, as well as its surface characteristics, was studied under different applied grinding loads in terms of the number of balls, ball diameter, grinding time, and density of balls (steel and ceramic) and fitted to first and second grinding kinetic laws. Although the d50 size decreases with increasing the applied load and time, the higher the load is the less the flotation performance. In addition, matching the FTIR spectra for heated oil shale samples surface with those for the ground product at different conditions indicated that the grinding zone temperature does not exceed 150 ºC with high oil shale oxidation with finer grinding. Furthermore, FTIR and Zeta potential indicated that although there is no organics release, the fine particles coating leads to bad flotation results. Finally, grinding and flotation mechanisms were suggested