do you know about hydrocyclones of Starch processing

       Although some impurities go with the starch in the underflow, there is - by means of a sieve - a last chance to remove the larger particles - that is particles larger than 125 microns. The particles are not spherical. On the contrary, they are of irregular shape and may be forced through refining sieve, if the spray pressure is too high.Impurities not removed this way are not removable by any known technique.

    In the strong gravitational fields of a hydrocyclone and a centrifuge, starch settle quickly, while fibres (pulp residuals) just float in the water. The juice is directly diluted in the water and goes with the water phase.

By creating a water flow moving towards the starch, lots of fibres just floating in the water may be forced into the overflow. Soil, sand and many fungi etc. are of equal density or heavier than starch and it is not possible to separate these particles from starch by centrifugal force - that is why it is so important to remove as many impurities as possible from the potato surface in the washing station.