Abstract
AbstractResults are presented for the equilibrium solubility of calcium sulphate hemihydrate in water containing large quantities of dissolved sodium chloride and magnesium sulphate over the temperature range 200–300°F. The concentrations of sodium chloride and magnesium sulphate in the solution correspond to the quantities of these salts found in sea water.It has been found that the saturation solubility of calcium sulphate is dependent on the content of magnesium ions as well as the sulphate ions and dissolved sodium chloride in the solution. This information is of particular importance in the evaporation of sea water where the degree of prior precipitation of magnesium hydroxide will directly influence the later deposition of calcium sulphate on heat‐transfer surfaces. The use of the results in this connexion is discussed.
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