This work was done as a fundamental investigation to obtain data required for the improvement of the salt field. It is obviously advisable that the sea water of which salt content is nearly of the highest degree is to be used at the field. In this work it was cleared that the chlor content in water is different according to the condition and position of water:-the sea water in “Mis”-the cannals between fields, the sea water at the ebb-tide or at the high tide, the underground water at the fields.

View full abstract

The authors measured the spectral reflectance of various common salts, sand “shansha”, surface soil of salt field “Irihama” and bed clay of sloping salt field in Oshio and Akaho, and distingnished their optical surface-character by their, spectral reflectance curves, brightness and trichromatic coefficients.

View full abstract

Experiments about the dobule decomposition of KCL with MgSO₄ were condudted at 25°C. Fox the double decomposition, commercial reagents of KCl and MgSO₄ were used. The amounts of KCl, MgSO₄·7H₂O and H₂O in the initial mixtures were calculated graphically, as shown in the previous paper, by means of equilibrium diagram for the four components system of the reciprocal salts pair, K₂Cl₂+MgSO₄⇔K₂SO₄+MgCl₂. Four series or experimental condition were selected, i, e., two ones for the best yield of schoenite which give the mothor liquors at the points p and t, one for the best yield of leonite which gives the mothor liquor at the point s, and one for the best yield of potassium spluhate which gives the mothor liquor at the point m. The mixtures were stirred, at 25°C, by means of a glass stirrer for a certain period or time, the mothor liquors were separated, their compositions were determined, were compared with those calculated graphically, and thus the progress of reactions were followed. Sometimes, the compositions of crystalls gain were used for the same perposes.
As the results, the author concluded as follows: for the purpose to get “Kalimagnesia”, the reaction proceded most smoothly, when the mixture was chosen to give the mothor of the composition at the point p, and the point s was most difficult to reach. The reaction to get MgSO₄. directly seemes procede smoothly. Nevertheless, all reactions procede too slowly. The author suggested that this may by improved by the use or the finer crystalls or wet ones for the double decomposition.

View full abstract

Bittern and magnesium chloride solution were electrolysed under the various conditions; solution temparature, concentration, voltage, current density, current concentration, depth of electrodes, and distance between electrodes, according to the method (1939) of M. Ishibashi, one of the authers. Hypochorite and chlorate concentration, the amount and composition of precipitates were measured.

View full abstract