A new technology using a vertical round tube filter with a wire mesh wall is developed, in order to separate ice crystals from the ice slurry generated in freeze concentration. The ice slurry discharged from an ice generator with rotating scrapers was introduced into the filter. The concentrate was filtered radially through the wire mesh filter and the ice cake was discharged from the upper exit in the form of an ice packed column with weight fraction of 0.50 to 0.53. The mean diameter of ice crystals was increased by 2 to 4 times during filtration. The increase in size is mainly due to contact and fusion of ice crystals. The concentrate contained in the ice cake was successfully recovered into a vacuum collector connected to a column filter packed with the ice cake by displacing the concentrate with fresh water fed to the column. As compared with ordinary centrifugal filtration, the residual concentration of solute among ice crystals is as low as a few 10 mg/l and also the loss of the concentrate is negligible.