Low Temperature Treatment of Desulfurized Bittern Mixed with Carnallite

Abstract

The previous paper [This Journal 18,276 (1965)] reported that the composition of salts deposited as the result of this concentration of desulfurized bittern mixed with carnallite was studied and that the potassium salt was found to be deposited as potassium chloride.
The present paper gives a description on the study that was conducted by chemical analysis on the composition of mother liquor and of those salts deposited by the cooling of desulfurized bittern mixed with carnallite at 0°C. The results obtained were as follows:
(1) Potassium salt deposited was found as potassium and/or carnallite, and the ratio of the potassium salt was decided by the amount of carnallite added.
(2) When a small amount of carnallite was added to desulfurized bittern, potassium salt was deposited as potassium chloride. For example, when 40% carnallite was added to desulfurized bittern, the potassium chloride content of the deposited salt was 91.13%.
(3) The compostion of the mother liquor coincided with the result of D'Ans's equilibrium diagram of the four component system, MgCl₂-KCl-NaCl-H₂O at 0°C.