Development of continuous freeze concentration equipment

摘要

We have proposed a new method of continuous freeze concentration and performed tests of the equipment assembled. The equipment consists mainly of an ice making part, which continuously produced ice flakes on a rotating cooling drum,and a continuous centrifuge separating part. Tests were conduced under the following conditions: cooling drum temperature, -11--24 deg C; rotation period of the drum, 98-610s; and residence time of ice flakes in the centrifuge, 15-600s. Diluted seawater (Cl~- concentration of 0.62-0.67 wt%) was used as a sample. The following results were obtained. The CL~- concentration of the separated liquor and the separated ice were 1.6-3.9 wt% and 0.27-0.55 wt%, respectively. The residual liquor ratio or the separated ice was 0.10-0.20.