In the course of our experiments to seek new salts by the addion of (NH₄)₂SO₄in various quantities to bittern at boiling point, we found out that besides (K, NH₄)₂SO₄·2MgSO₄which had already been reported, a new basic salt closely resembling 8 MgSO₄·Mg(OH)₂·8H₂O in shape was separated.
Though the constituents of the new basic salt were Mg, NH₄, SO₄, OH and H₂O as the result of chemical analysis, it was difficult to determine its chemical formula; because the contents of NH₄and OH were very small in comparison with those of Mg and SO₄.
It is very interesting to note that in spite of the fact that no basic substance was added to bittern the separated salt was basic. The specific gravity, thermogravimetric analysis and the X-ray diffraction patterns of the new salt were studied.

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In salt maaufacure brine coacentration in evaporators is usually measured by a Báume's hydrometer. A correction msut be made for density change due to variation in temperature drop of brine and a mount of the suspended calcium sulfate. A nomograph, based on our experimental results, is presented here.

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Colloidal calcium carbonate in a proportion of 0.1% of salt is being added to “Kitchen Salt” of 99% NaCl as an anti-caking agent. Table-feeder is used for the addition. Main problems of design and operation of the table-feeder have been solved after several experiments.

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Electrolytic production of magnesium basic hypochlorite (magnesium bleaching powder) from bittern containing a relatively large amount of sodium chloride (about 7%), was studied as the first process of the electrolytic utilization of bittern ingredients. By this process magnesium bleaching powder may be gained without any addition of alkali, because of OH ions formed on cathode.
The highest available chlorine content of magnesiun bleaching powder obtained was about 39%.
The most suitable temperature for electrolysis was about 30-40°C. The PbO₂electrode used consisted solely of PbO₂without any metallic lead base. Up to anode current density of about 0.2A/cm², PbO₂anode was found to be a suitable electrode for magnesium bleaching powder production by bittern electrolysis.

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In the electrolytic production of magnesium bleaching powder from bittern containing a small amount of sodium chloride, it was found that the yield decreased remarkably, because of the increased acidity.
Therefore, by the addition of alkali to the bittern, a good effect was expected. Magnesium hydroxide precipitates produced by the addition of sodium hydoxide, contaminate the magnesium bleaching powder gained, and lessen the available chlorine.
So, the relations between the amount of sodium hydroxide added and concentrations of ClO^-and ClO^-₃in electrolyte, pH of this solution and available chlorine increase of magnesium bleaching powder during electrolysis, were studied.
The optimum amount of sodium hydroxide to be added was found to be one equivalent to hydrogen chloride produced during electrolysis. This amount of sodium hydroxide gave the highest yield and the highest avilable chlorine. The optimum pH was 7-7.3, and PbO₂electrode as an anode was found to be suitable, also, in the alkaline solution.

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