製塩工程におけるフツ素の行動について

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  • Behavior of Fluorine in the Processes of Salt Making
  • 製塩工程におけるフッ素の行動について
  • セイエン コウテイ ニ オケル フッソ ノ コウドウ ニ ツイテ

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The behavior of fluorine in the processes of salt making was studied through the analysis of fluorine in the following samples.<BR>(1) Samples of scales deposited at the lower and at the higher concentration degrees, common salt, and the final mother liquor, prepared by the concentration of sea water in vitro under six different conditions.<BR>(2) Samples of sea water, brine, common salt, mother liquor, bittern, and scales, collected from four salt making plants of different processes.<BR>The results obtained were as follows:<BR>1. In the case of concentration of sea water in vitro:(1) There was no large difference in the behavior of fluorine among different concentration conditions.(2) The distribution percentages of fluorine (the percentage of the amount of fluorine in the deposits or mother liquor to the total amount of fluorine in the sea water used.) were 53 to 63% in the scale, 0 to 5% in the common salt, and 36 to 47% in the final mother liquor.<BR>2. In the case of plant processes:(1) The difference of salt making process had little effect on the behavior of fluorine.(2) The distribution percentages of fluorine were about 90% in the scale, 0 to 5% in the common salt, and 3 to 6% in the bittern.<BR>3. It was presumed that fluorine dissolved in sea water and brine might be in the form of calcium fluoride, and that, when the deposition of scales took place, dissolved calcium fluoride might be adsorbed on the scales and coprecipitated with them.

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