Fluidization Needed to Achieve Reliable Fine Powder Flow The Need Manufacturers of asphalt roofing shingles often use fine, hot limestone as filler with liquid asphalt. In order to maintain uniform mix viscosity and temperature, flow of limestone into the batch mixer must be controlled and reliable. One manufacturer tried various surge bin designs for fine limestone which were unacceptable. Vibrating bin dischargers were most unsatisfactory since the discharge rate varied from no flow to uncontrolled flow, or flooding. Depending on the flow properties of material to be handled and operating conditions, gravity discharge is not always the most practical solution when designing bins, silos, and hoppers for handling bulk solids. An alternative design considered for the hot, fine limestone

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