Effect of particle breakage conditions on child particle aspect ratio

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In particulate processes, the goal is often to control the particle size and aspect ratio distributions. One common unit operation is solution crystallization in agitated vessels, where a rotating impeller can break newly formed crystals. This study used sodium chloride crystals in three sets of laboratory scale experiments to investigate the effects of agitation rate, parent particle size, and solids concentration on crystal breakage. The first set used agitation rates of 1000, 1250, 1750, and 2000 rpm; the second set used average parent particle lengths of 569, 656, 3350, and 4690 μm; and the third set used solids concentrations of 1, 5, 7, and 10 g crystals/100 ml liquid. As expected, increasing the agitation rate produced a higher number fraction of particles smaller than 50 μm. The resulting child particle aspect ratios were primarily a function of the child particle size under the conditions studied.

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