製塩工程における微量元素の行動について

概要

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The behaviors of copper, zinc, lead, iron, aluminum, manganese and molybdenum in the process of salt making in 5 representative plants of Japan were traced through the analysis of the various samples obtained from the plants, and following results were obtained. 1. The distribution tendency of these metals coincided with the results already reported in part 1 of these studies. 2. Among these metals, molybdenum was the only metal which was derived from sea water. The other metals entered mainly as suspended matter in raw materials, or originated from the salt field or the apparatus. 3. Copper entered mainly from the tube of the preheater or evaporator, and zinc was derived mainly from the zinc plate used for the cathodic protection of evaporators. Greater parts of both these metals were concentrated in the bittern. 4. Molybdenum was concentrated mostly, and lead and iron partly, in the bittern. A presumption was made on the behavior of 12 minor metals in a salt field through comparison of the results of the analysis of solar salt and that of shallow water mud. In solar salt, iron, aluminum, titanium, cobalt, chromium, nickel, molybdenum and perhaps vanadium entered as mud itself, and copper, zinc, lead and manganese were derived mainly through dissolution of these metals from the mud of salt field.
日本海水学会の論文