Parameter effects on dry fine pulverization of alumina particles in a fluidized bed opposed jet mill

The paper presents the experimental results on dry fine pulverization of alumina particles in a fluidized bed opposed jet mill. The effect of operating parameters (i.e., feed load, inlet air pressure and the distance between nozzle outlet and jet meeting point) on the grinding results was investigated in detail. The breakage behaviors of alumina particles with respect to the effects of different parameters were discussed via the selection and breakage functions calculated by the first Kapur function method. In addition, the product size distributions could be simulated by a proposed model.

Fig. 9 shows the breakage distribution function bi,j as a function of the particle sizes of the ground product for the other size classes (i.e., size classes 1, 5, 9, 15, 22 and 31) at various inlet air pressures. Apparently, the finer ‘daughter’ particles could be produced from the ‘mother’ particles in these size classes at a greater pressure (0.65 MPa and 0.50 MPa) rather than at a lower pressure (0.35 MPa) due to the higher energy input.Figure optionsDownload as PowerPoint slideHighlights
► The effect of operating parameters (i.e., feed load, inlet air pressure and the distance between nozzle outlet and jet meeting point) on the grinding results was investigated in detail.
► The breakage behaviors of alumina particles with respect to the effects of different parameters were discussed via the selection and breakage functions calculated by the first Kapur function method.
► In addition, the product size distributions could be simulated by a proposed model.