On the Extraction of Potassium Chloride in Bittern free from Mg<SUP>2+</SUP>

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  • マグネシウム除去にがりより塩化カリの採取について
  • マグネシウム ジョキョ ニ ガリ ヨリ エンカ カリ ノ サイシュ ニ ツイテ
  • Studies on the Treatment of Sea Water, Brine and Bittern with Slaked Lime (Part 3)
  • 海水, かん水およびにがりの石灰処理に関する研究 (第3報)

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In the previous paper, the equilibrium of five components system Ca(OH)2-CaCl2-KCl-NaCl-H2O was studied, and it was found that the range to form the double salts of calcium hydroxychloride in this system. So, in this report, extraction of potassium chloride in bittern free from Mg2+ was investigated in the various conditions to find effective factors.<BR>As the results, the reaction between bittern free from Mg2+ and calcium hydroxide was mainly decided by the amount of calcium hydroxide added, K/Ca ratio in the bittern was nearly increased proportionally to the amounts, for example, in the case of addition of 15% calcium hydroxide, the value of K/Ca was increased from 0.28 to 0.40.<BR>This treated solution was evaporated at the boiling point to various degrees of concentration, and cooled down to 25°C to separate potassium chloride. The extraction rates of potassium chloride calculated with equilibrium diagram, were compared with the ones obtained experimentally.<BR>As the results, it was found that the yield of potassium chloride from the solution treated with calcium hydroxide were some 15-20% more than the ones untreated, and in the best conditions, the absolute value of the yield reached 75-80% for the original bittern.

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