As to the fundamental experiments previously conducted on the production of brine with a smallscale Shijoka concentrator, we have already reported their results in this bulletin, 16, 177, 221 (1963). In this study, further experiments were conducted for a year‚s period on the production of brine
using larger Shijoka concentrators covered with plastic films. A pair of Shijoka concentrators (10m length, 12m depth and 5m height) were constructed in the salt field, and the one covered with plastic films was operated as an experiment plot, while the other was operated as a control plot. By using these apparatus, we experimented the evaporating efficiency, the brine droplets splashing from the Shijoka and the loss of salinity of each Shijoka caused by rainfalls. We were able to obtain some results which proved useful for the practical production of brine.

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前報に引き続き強制通風向流型枝条冷却塔の性能に検討を加えるため実用規模の装置を作成し, 塔内の液温分布, 空気温分布ならびに装置の総括容量係数をもとめた. その結果, 塔内の空気温は同場所における液温より低く, したがつて相対湿度が低く液入口温度も低い場合は塔内の空気温度が湿球温度に近づく点があることが明かになつた. また枝条を充填材とした場合は, その総括容量係数はかなり大きい値をとるが偏流のないよう設計の際に充分留意する必要がある.

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A study was conducted on the behaviors of strontium and calcium in the concentrating process of sea water. In this study, sea water was gradually evaporated at 50-70°C or at the boiling temperature until it reached one twentieth of its initial volume, and the behaviors of strontium and calcium were traced by using radioactive isotopes,⁸⁹Sr and⁴⁵Ca. Strontium in sea water and brine was spectrophotometrically determined by ο-cresolphthalein complexon method after it was separated from other elements by coprecipitation with calcium oxalate and by cation-exchange method.
The following conclusions were obtained from the experimental results:
1. In the early stage of concentration, the loss of strontium from the sample solution was negligible. When 85%(in volume) of sea water was evaporated, the concentration of strontium reached the maximum and was four times as much as the concentration of sea water. Strontium indicated rapid precipitation after it reached the maximum point, and a trace of strontium was detected in the bittern.
2. The behavior of calcium was almost the same as that of strontium although the depositing tendency of strontium was a little more remarkable than that of calcium, and most of strontium was considered to be distributed in the gypsum deposit.
3. As shown in Table 3, the ratios of strontium concentration in sea water and brine samples were in good agreement with the results obtained from the evaporation experiments.

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海水より淡水を蒸発分離するプロセスとしての間接伝熱の多段フラッシユ蒸発法の熱経済性に関係する事項について理論的考察の結果, 貫流型および循環型における成績係数, 所要エネルギーおよび濃縮率について次の関係式を得た.
1) 貫流型成績係数:
所要エネルギー:
濃縮率:
2) 循環型
成績係数:
所要エネルギー:
濃縮率:

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The vitreous sodium polyphosphate having the composition of Na₂O/P₂O₅=1 (molar ratio) is called Graham's salt, but its molecular weight or polymerization degree is different depending on the conditions of the manufacturing process. We measured the molecular weight of a Graham's salt by the light. scattering method, and obtained the value of approximately 1,580.
When the Graham's salt is added to the aqueous solution of calcium sulfate at the room temperature, a jelly-like substance with the composition of calcium salt is precipitated from the mixed solution of P/Ca=0.03-2.5 (atomic ratio).
Below 0.03 (P/Ca) the polyphosphate is dissolved as a calcium salt with the molecular weight of 22,000, and above 2.5 (P/Ca) the most part of polyphosphate as the sodium salt pocessing the molecular weight of 1,900.

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