Abstract
When sea water or brine are treated with slaked lime, Mg2+is separated as hydroxide. And small quantity of SO42-is deposited as calcium salts during the early stages of the concentration and thus removed from the solution before it becomes saturated with any other salts. The solution may be considered to form the quaternary system CaCl2-KCI-NaCl-H2O. So, the author investigated the following 2 relations.
(1) The isotherms for the quaternary system CaCl2-KCl-NaCl-H2O were determined at 25°. 0° and -10°C.
(2) The solution was evaporated at the boiling point to various degrees of concentration, cooled down to 25° or 0°C, and alkali chlorides were deposited out. The amounts of alkali chlorides obtained were compared with the values calculated by using the equilibrium diagram. As the result, it was found that these two results coincided fairly well.
