抄録
This study was conducted to examine the validity of phase diagrammatical method on the separation and utilization of oceanic salts in sea water.
There are various methods for the separation and utilization of oceanic salts which are complicated salt solutions. However, it must be considered that the multiphase equilibria in salts and water systems such as mixed salt solution treatments are accompanied by phase transition.
Therefore, the author devised the method of surmising various qualitative and quantitative relations in the case of solution treatment, under a phase rule analysis by drawing the equilibrium diagrams of the five-component system in oceanic salts and by making graphical calculations including the samples and conditions. The validity of this graphical method was confirmed by experiments.
The drawing of the equilibrium diagrams, the graphical calculations and the experiments were carried out on the preparation of potassium chloride from carnallite and on the preparation of potassium sulphate from bitter, especially for the purpose of recovering potassium salts.
As the result of the study, the author found theoretical relations on the optimum conditions, yields, etc., which have not been made clear yet by the oceanic salt industry depending on just experiences.
The results of the author's diagram-drawing, graphical calculations and phase rule analysis coincided fairly well with the values actually determined. Thus, the method proposed by the author was proved to be valid and useful.
The conclusion of the author was that the method was fairly reliable and could be used for making judgements, estimations and fundamental operation in the case of planning of factory manipulation, investigation, etc.
