Abstract
The solubilities of the quinary system of NaCl-KCl-MgCl2-CaCl2-H2O and its surrounding systems at 0°C were investigated to get the basic data for the graphical computation of the treatment process for recovering valuable components in the ion exchange membrane brine and its bittern. The results obtained were as follows:
1. Four salts were precipitated lrom the quaternary eyetem of NaCl-KCl-MgCl9-H9O9i.e., Na CI, KCl, MgCl2·6H2O and carnallite (MgC12·EKCl·6H2O), and the KC1 crystallization region in the diagram on the triangular coordinate (g/100 g salts) was found to occupy 68.9% of the total area, while that of the NaC1 was 30.5%.
2. Three salts were precipitated from the quaternary system of NaCl-MgCl2-CaCl2-H2O,i.e., NaCl, MgCl2·6H2O and CaCl2·6H2O, and the area occupied by the NaCl was 99.1%.
3. Five salts were precipitated from the quinary system,i.e., NaCl, KCl, MgCl2·6H2O, CaCl2·6H2O and carnallite, and the area occupied by the simultaneous crystallization region of KCI and NaCl in the diagram (g/100 g (KCl+MgCl+CaCl)) was 86.8%, while that by the carnallite and NaCl was 10.8%.
