The works2>3)5) published to date on filter aid applications have not been concerned with prediction of the porosity of the mixed cake of a filter aid and a solid impurity, though Shirato et al.i] predicted the filtration characteristics of a mixture of two slurries of approximately the same filtration characteristics on the basis of the additive law.

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Twomodels are presented to estimate the average specific permeation resistance through a packed bed of binary mixture of particles. To confirm the validity of these models, packing and permeation experiments are carried out for systems of both spherical and non-spherical particles with particle size ratio ranging from about 2 to 10, and it is shown that estimated results agree well with experimental values. The variation of average specific permeation resistance with mixing ratio and particle size ratio is also shown.

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cal particles from mixtures of particles of different shapes by using a rotating tube. In this work, separation of particles according to shape was carried out by meansof a vibratory plate separator, which is quite different from the apparatus in the works referred to above.

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