The essential features of distinction the particles are size, shape and surface roughness. The classical characterization of particles by using size analysis and geometric shape factors often cannot distinguish the valid differences between individual powders. By means of computer aided-image analysis, some parameters (which are used in estimation the surface roughness, shape and size of particles) can be determined. Detachment process of particles from the gas-liquid interface is a phenomena with important effects on interfacial processes such as flotation. An approach of the determination...