not shown for drying and or further processing conduit 41 which conducts the grit starch from the grit starch screens 28 joins conduit 47 conducting the fiber starch from the fiber washing stage 34 with the combined flows in conduit 49 forming the feed slurry to station c the feed slurry may contain from 5 to 15 protein gluten with approximately 8 protein on a dry basis the feed slurry at a density of from 6 u00b0 be to 12 u00b0 be and usually about 7 5 u00b0 be is introduced into the high rate washing classification centrifuge 61 as a strong flow of wash liquid a wash liquid draw off volume ratio in the range 1 to 2 is injected into the centrifuge through conduit 62 the purpose in having more wash water than draw off is to have a high net flow of wash water inward towards the center of the rotor this inward wash stream will 34 lift 34 the insoluble gluten away from the starch by changing the sedimentation situation so that the difference in density of the heavier starch and lighter gluten is emphasized magnified by having a powerful liquid current flowing inward whereas a strong gravitational centrifugal force is exerted outward the sloping surfaces of the rotor bowl walls and the discs serve to positively reinforce this separating action on the two insoluble fractions with their widely different sedimentation characteristics the net reversal in flow direction will prevent the hindered settlement action.