Abstract
Using Fourier shape analysis, differences in the shape mix of glass particles crushed under open and choke flow conditions were demonstrated. Particles crushed in open flow are more angular, have larger asperities and more complex shapes. Smaller particles are more elongate, complex and angular. Since it was found that smaller particles are more complex, irregular and have higher aspect ratios than larger ones, it is suggested that a major factor in lung damage from small particles may be due to the particle's shape. Because of their irregular shape, fine particles do not pack well and have a low bulk density. The particle shape distribution of feed, product and waste streams of mineral processing unit operations needs to be characterized to learn how shape affects the recovery of minerals, so that equipment and circuits may be designed to optimize recovery. Experiments were reproducible and the method of Fourier analysis for characterizing shape distributions was found to be a good, reproducible research tool for comminution shape studies.
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