In order to classify fine particles in slurry flow, vertical type water sieve with electro-potential applied to flow is newly developed. The 50％ cut size decreases with the increase of under-flow rate of coarse side. The maximum particle size in the over-flow side decreases as the over-flow rate decreases.
By use of the electro potential applied to the upper and lower plates, the 50％ cut size decreases with the increase of applied potential. The minimum cut size of about 0.62μm was obtained from the experimental data. The accuracy of classification also increases with the increase of applied potential. The experimental data of cut size agreed with the calculation results based on gravity and electro migration effect in particle sedimentation velocity.
