Abstract
Qualities of Korean solar salts were studied from the concentrating process of sea water and the growth of their crystals. And the following results were obtained;
1. According to the analytical results of the Korean solar salts imported in 1960-1962, they were composed of 88-91% sodium chloride, 6-7% water content, 0.3-0.5% ipsoluble matters, 0.3-0.4% magnesium ion and 0.09-0.17% calcium ion. They were much inferior to those of the Mexican and Australian solar salts which have been imported recently.
2. The observation of the samples taken from the Korean solar salt-field in 1971 showed that they were of 1-2 mm particle-size and porous crystals containing much mother liquid therein. Moreover, they contained a large amount of cavities in crystals.
3. Brines, mother liquids and salts from the worst section among Sorae Salt-Field (No.3100) taken in 1971 were analysed. The results showed that the compositions of the brines had been on the concentrating process line of sea water, while those of the mother liquids in the crystallizing pond had been excessively concentrated to such an extent of 30-32° Bé and shifted from the concentrating process line of sea water to the composition point of magnesium sulfate.
4. The inferior qualities of Korean solar salts are considered to be caused by the fact that they are crystallized in such an excessive concentrating process of sea water (30-32° Bé). Therefore, they contain much more cavities in crystals and because they are crystallized in the crystallizing pond where the depth of the brine is as shallow as about 10 mm, they grow rapidly towards {111} direction resulting in the porous structure containing a large amount of mother liquid. Also, only a day or two harvesting period brings about such small particle-size as 1-2 mm.
5. The apparent densities of the Korean solar salts were 0.7-0.8g/cm3(coarse) and 1.0-1.1g/cm3(dense), which were smaller than those of any other solar saits.
