Once the solution contains as much salt as it can hold, it is said to be saturated any further additions of salt will not dissolve.Įvaporation is the reverse of this process. Only a certain quantity of salt will dissolve in water at any given temperature. Bulk handling has been greatly facilitated by the use of anticaking agents which allow the salt to be stored uncovered and outdoors without becoming a hard mass again. The salt is mined in large lumps that are first crushed, then more finely ground and screened by size into various grades the salt is then bulk-loaded into trucks, hoppers, or barges or loaded into bags for further handling. When the rock salt is of a high degree of purity, as in Poland and the United States, the salt may be ground, screened, and marketed without further processing.
The method affords opportunities for purification of the salt. The mined rock salt sometimes is dissolved and the salt manufactured by treatment of the brine, as described below. The beds of rock salt are mined or quarried by the usual excavation methods, depending on the depths and thicknesses of the deposits and on local conditions. A considerable amount of brine itself is used directly in industrial countries. Most of the artificial brines are obtained by pumping water into underground salt beds. Commercial salt is manufactured from rock salt, as well as from seawater and other natural and artificial brines.
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