Abstract
In the previous paper [Sci. Papers Centr. Res. Inst., Japan Monop. Corp., Nos. 105,229 (1963)], the Compostion of salts deposited by the concentration of raw bittern was studied by chemical analysis and X-ray diffraction.
In the present paper, the author conducted an experimental study on the concentration of desulfurized bittern by adding carnallite for the purpose of extracting potassium chloride from bittern. The results thus obtained were as follows:
(1) In the early stage of evaporation, the compositions of the mother liquor well coincided with the equilibrium diagram of the four-component system, MgCl2-NaCl-KCl-H2O, but the coincidence became worse toward the end of evaporation.
(2) The content of potassium chloride ranged from 71.6 to 73.1g per 100g of the salt deposited by concentration and from 88.4 to 91.8g per 100g of the salt washed with saturated potassium chloride solution.
