Quality of Thai Solar Salt and Chemical Composition of Mother Liquid in Concentrating and Crystallizing Ponds
Studies on Mother Liquid in Salt-Manufacturing Process (Part 35)
1985 Volume 38 Issue 5 Pages 314-321
Details
1985 Volume 38 Issue 5 Pages 314-321
In the previous papers, the quality of solar salts of various countries was studied from the amount of impurities and the crystal-form. In this paper, the author studied the relation between the quality of Thai solar salts and the composition of mother liquid in both concentrating and crystallizing ponds. And the following results were obtained:
1. The amount of impurities of Thai solar salt was much more than those of other countries.
2. Crystals of Thai solar salt consisted of 2-3 mm unit-crystals, which weakly attached to each other. And they easily separated from each other when they were crushed by hand.
3. The chemical composition of mother liquids in the crystallizing ponds was 20-40 Mg mol/1,000 mol H2O and was rich in magnesium sulfate as compared with the one in the normal con-centrating process of sea water.
4. The author has estimated as follows how Thai salt comes to contain lots of impurities: Thai solar salt crystallized in the mother liquid of high magnesium concentration with high crystallizing rate. Those conditions cause the salt to have many cavities in crystals as well as much room surrounded by small unit-crystals. Both the cavities and rooms were filled with mother liquid containing many impurities.
