Deposited Salt from the Liquid Attached to the Surface of Common Salt When Cooled
Caking Mechanism of Sodium Chloride (Part 4)
1966 Volume 20 Issue 2 Pages 67-71
Details
1966 Volume 20 Issue 2 Pages 67-71
The author discussed a relation of liquid attached to the surface of the crystals to the caking tendency of common salt from two view-points;deposit of salt from liquid when cooled and vapor pressure of liquid (reported later).
In this paper, the author treated the liquid on the surface of common salt as an oceanic quinary system saturated with sodium chloride, and discussed the kind and quantity of deposited salts other than sodium chloride when the liquid was cooled by applying phase diagram in graphical method. Calculation results were;
1. When the liquid saturated with sodium chloride and more than one salt other than sodium chloride at 55° and 110° is lowered to 25° as a standard temperature, salt other than sodium chloride deposits in the area near K2axis in Jänecke's figure.
2. When 10° was set as a standard temperature as discussed in 1., salt other than sodium chloride deposits in the both areas near K2and SO4axes.
3. When 0° and 10° were taken as a standard temperature, as discussed in 1., salt other than sodium chloride deposits in all the areas.
4. When 0° and 10° were taken as a standard temperature, transition of double salts occurs in the cooling process especially near Mg-S04line. And this was supposed to cause common salt to cake.
