外文资料--ANEWAPPROACHTOTHEPREDICTIONOFPARTICLE.pdfVIP

0960–3085/00/$10.00+0.00 # Institution of Chemical Engineers Trans IChemE, Vol 79, Part C, December 2001 A NEW APPROACH TO THE PREDICTION OF PARTICLE SEPARATION BY SIEVING IN FLOUR MILLING F. M. SULTANBAWA, W. G. OWENS and S. S. PANDIELLA The Satake Centre for Grain Process Engineering, Department of Chemical Engineering, UMIST, Manchester, UK ieving is probably the oldest and most widely used method for solid-solid separation. It is relatively rapid and simple and, therefore, a popular method, but it has not received Sthe scienti c attention it deserves. This could be due to the fact that in this unit operation the variables involved are numerous and, as a result, their interactions are so complex that no satisfactory method of evaluating and predicting the sieving process has yet been developed. This has led to the inef cient operation of industrial sieving equipment. It is, therefore, important to have a better understanding of the process to de ne the optimum operating conditions for a sieve or for a sifter cascade. It is also evident that the kinetic aspects of sieving have been particularly neglected, even though they govern the ef ciency of the separation and the economy of the screening process at industrial scale. In practice, sieving is performed based more on experience and intuition rather than theoretical foundation. In our milling breakage of particles is always followed