Abstract
In order to obtain fine powder, dry dispersion and classification are used in the several industries. In this paper, firstly, the effect of liquid dispersion aids on dry dispersion of submicron metal powder was investigated. Measurements of dispersabilities of test powder with and without Diethylene glycol monomethyl ether （DEG） revealed that DEG improves the dispersability of metal powder by the factor of about three compared to the dispersability of metal powder without the aids. Through the observation of structure of metal powder after mixing it with DEG, the improvement in dispersability is due to the change in agglomerate structure from compact agglomerates to chain-like agglomerates. Secondary, our group has proposed a classifier equipped with a particle-trap ring at the exit of the classification zone to prevent the escape of large particles entrained by shortcut flow. The visualized swirl flow compares favorably with simulation results obtained by CFD.
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