We found that this kind of salt field was superior to the Irihama salt field, according to the Research Data Hofu Salt Experiment Station, Japan Monopoly Corporation, No.47.
So we built a comparatively large scale one, about 7,600m², and studied in the concentration of sea water, from April 1956 to March 1957.
Comparing with the common sloping salt field of clay bed, we obtained the following results;
1) Amount of evaporation in this salt field was 530mm/year, and its value was about 70% of the other's.
2) Ratio of concentration was about 73%, yield was about 92%, and there were no differences in these values, between the sloping salt field of clay bed and this type.
And then we investigated on relation between evaporation in salt field and some atomospheric factors.

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以上を要約すると,
(1) CaC₂(市販品) と, 化学用CaOより水和して得られる石灰乳のCaCO₃化を比較して, 前者は生成直後CaCO₃の存在せぬことを認めた.
(2) CaC₂とMg(OH)₂を得る直接法と, 一度水でCa(OH)₂を造つた後MgCl₂と反応せしめる二段法を比較して, 工業原料である苦汁の濃度付近では, 直接法のMg(OH)₂は濾過性, 結晶子の大きさ共に大, かつCaOの含有率小なることを実測し, 著者らの従来の推測からその理由を説明した.

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Hitherto, the formula of evaporating velocity for a multi-vertical flow system concentrator in salt production had some fatal defects that it was inapplicable for all sorts of concentrator and was impossible to know the relation into evaporating velocity and elements of construction.
In this paper, the authors have researched in the formula for various concentrator by dimension analysis. Obtained results were as follow; the formula is
The relation into e and each element is
(1) proportional to 0.6'th power of wind velocity, Vs,
(2) proportional to 0.2'th power of liquid flow velocity, Vw,
(3) proportional to 0.75'th power of height, H,
(4) proportional to 0.3'th power of depth, B,
(5) proportional to 0.185'th power of density of body element, f,
(6) inversely proportional to 0.5th power of length, L,
(7) inversely proportional to 0.4'th power of pich of feed pipe, Pt,
(8) proportional to saturation deficit, ΔC,
and (9) k·S or e/ΔC decrease with dimensionless wind angle for direction of feed pipe, θ.

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In the previous report was proposed the two-step method for preparing activated magnesium silicate of “MgO: Si0₂:H₂O=2:3:n” mole ratio. This work was undertaken to investigate the activation mechanism of the above method.
The results are as follows;
1. The new method is processed by the two steps: firstly, magnesium silicate of “2.65:3.00:n” mole ratio is precipitated by the reacticn between magnesium salt and sodium silicate solution, secondly the precipitate is decomposed with the acid solution in order to convert the composition to “2:3:n” mole ratio.
2. The precipitate prepared by the first treatment is in the amorphous and voluminous state. The product of “2:3:n” mole ratio obtained by the second treatment is the coagulated precipitate of the fine palticles, the composition of which is magnesium silicate and the surface of these particles are covered with free SiO₂gel. These particles are, furthermore, very small, porous and inhibit themselves from the close packing, having large surface area.
3. Therefore, the high adsorbing power of “2:3:n” mole ratio product made by the two-step method originates in the particular state of the particles as described above.

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In a previous report, optimum conditions in direct electrolytic separation of dissolved magnesium and calcium in the sea water were studied, and it was found that a process which used a diaphragm and precipitated magnesium ion as hydroxide was better to complete removal of magnesium.
So, in this report, under the conditions using diaphragm and agitation in 30°C, factors that had been employed were the quantity of electrolytic current and current density, and the effects of the two factors on the variation of magnesium, calcium, and chlorine ion concentration, the removal ratio of magnesium and calcium, the ratio of calcium to magnesium in precipitate, adhessive ratic of magnesium and calcium to the cathode plate, oxidation current efficiency, decomposition ratio of chloride, and the pH value in electrolyte were studied, and the relations between above characteristic values and the quantity of electrolytic current were determined.

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The conditons of the precipitations of the various complex compounds formed of carboxylic acid such as tartaric acid, saccharic acid, mucic acid and glucuronic acid, and alkali earth metal such as barium, strontium and calcium, and boric acid have been investigated. Tartaric acid and saccharic acid precipitate the complex compound with barium or strontium respectively, and the precipitation conditions are not so limited, and the reactions are sensible. On the other hand, a little precipitate occurs for mucic acid and glucuronic acid at reasonable conditions. And with calcium, these carbo ylic acids are not precipitated. The quantities of these precipitates, generally not depend on the kinds of the buffer solutions, but the pH of the solutions.

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Boric acid adsorbes selectively in P. V. A. even in the presence of salt. Adsorption equilibrium of boric acid in P. V. A. reaches sufficiently in a night. The quantity of boric acid adsorbed in P. V. A. increases in small amount by addition of such a substance as polyoxy compound and urea which cause the increase of the solubility of boric acid in water. The quantity of boric acid adsorbed in P. V. A. is independent to the size of P. V. A. particle. Water may be used for elution of boric acid. Different from the Ion Exchanger Resin, boric acid can not be eluted with acid or alkali. Boric acid is less eluted with ethyl alcohol than with water.

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