Abstract
The authors reported in this paper a relation of the liquid on the surface of common grade salt to mother liquid in a crystallizer. A week long experiment was carried out at Kinkai and Naikai Salt Manufacturing Companies on the chemical composition and specific gravities of the liquid in salt manufacturing process. And the results were discussed from an ideal concentration process of sea water reported in their previous paper. The results were;
1. The chemical composition of the liquid at Kinkai's was on the ideal concentration process of sea water as at many other salt manufacturing companies. The content of sodium, magnesium and sulfate ions in the liquid was proportional to dt15 (t=15-25°) within dt15 of 1.20 and 1.30.
2. The chemical composition of the liquid at Naikai's was not on the ideal concentration process of sea water in contrast with Naikai's.
3. Less sulfate salt was in the liquid on the surface of Kinkai's, while more sulfate salt was on the surface of Naikai's. Therefore the Naikai's. salt has more caking tendency than the Kinkai's. This accorded with the experimental results of caking tendency of common grade salt in stores and ware houses.
4. Chemical and X-ray diffraction analysis showed that deposited salts from mother liquid in salt manufacturing process were a sodium chloride, magnesium sulfate hexa and hepta hydrates, kainite (MgSO4·KCl·3H2O) and glauberite (Na2SO4·CaSO4). And this was discussed from an ideal concentration process of sea water.
