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Determination of KCl solubility,interfacial region and induction period in carnallite
Received date: 2019-11-29
Online published: 2020-05-21
The solubility of potassium chloride in carnallite was determined by variable temperature dissolution dynamic method.Solubility data were calculated by simplified solid-liquid equilibrium equation.The effects of stirring speed and cool-ing rate on the width of the medial zone and the different supersaturation on the induction period were studied.The results showed that the simplified solid-liquid equilibrium equation can fit well to the solubility of potassium chloride;the width of the medial zone widens with the increase of the temperature drop rate,and becomes narrower with the increase of the stirring speed,the induction period is shorter withthe increase of the supersaturation,and the induction period at the same supersatu-ration is similar at different temperatures.Using the classical Nyvlt theoretical equation and 3D nucleation principle,com-bined with the data of experimental mediation and induction period,the nucleation series of potassium chloride in carnallite was calculated to be 2.46~2.51,and the surface tension γ of potassium chloride in the system is 0.019 8~0.556 0 at 283.15,293.15,303.15 K,the surface energy factor f<3,and the crystal grows continuously.
Key words： solubility; metastable zone; induction period; potassium chloride
Meiling Qi , Gang Wang , Liyuan Zhang , Yulong Xie . Determination of KCl solubility,interfacial region and induction period in carnallite[J]. Inorganic Chemicals Industry, 2020 , 52(5) : 45 -49 . DOI: 10.11962/1006-4990.2019-0406
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