Modelling fine grinding in a fluidized bed opposed jet mill

High-intensity ultrasound, is sought as a means to break particles. A horn-type ultrasonic transducer is used to apply HIU into a suspension of alumina particles causing breakage to occur. The rate of particle breakage is monitored continuously via in-line laser-based particle chord length measurement. Kapur function analysis is used to arrive at the grinding kinetics under variations of ultrasonic power, particle loading, temperature of the suspension and particle size. The first Kapur function increases monotonically with increase in input ultrasonic power. Increasing temperature also increases the first Kapur function but an optimum in the range investigated (10-50 C) is observed near 25 C. An exponential relation is found for the variation of first Kapur function with particle size, this being unique to ultrasound-mediated particle breakage. The breakage mechanism is attributed mainly to particle abrasion. Different breakage mechanisms are observed at different temperatures.

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Dry Desagglomeration of Nanoparticle Agglomerates in an Air Classifier Mill

Füchsel

Husemann

Peuker

2011

Chemie Ingenieur Technik

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Durch das Dispergieren von Partikeln in Gasen können Dry Desagglomeration of Nanoparticle Agglomerates in an Air Classifier MillProduction of aerosol by dry dispersion is important for many technical processes, e.g., coating. The desagglomeration of materials from the product class nanoparticle flocks is a specific challenge. An insight in results and experiences by the dry desagglomeration with an air classifier mill (jet mill) is given. The variable main influences are the cage wheel ratio, the process air flow, the specific surface of the model substances and the length of the transport pipe.

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Modelling fine grinding in a fluidized bed opposed jet mill

Cited by 26 publications

References 3 publications

Jets in Fluidized Beds

Jets in Fluidized Beds

Particle grinding by high‐intensity ultrasound: Kinetic modeling and identification of breakage mechanisms

Dry Desagglomeration of Nanoparticle Agglomerates in an Air Classifier Mill

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