表面活性剂对光卤石中氯化钾结晶介稳区和诱导期的影响

doi:10.11962/1006-4990.2019-0473

Abstract

Abstract:

The solubility of potassium chloride in carnallite was measured by on-line monitoring system,and the solubility data was fitted by Van′t Hoff equation.The effects of different surfactants and contents on the metastable zone width of potassium chloride in carnallite,and the effects of surfactants on the induction period under different supersaturation were investigated respectively.The solid-liquid interfacial tension γ value was calculated by combining the induction period data.The results showed that the Van′t Hoff equation can fit well to the solubility of potassium chloride.Three surfactants broadened the width of the metastable zone.When the content of anionic and cationic surfactants was increased,the metastable zone width was also broadened.However,the content of non-ionic surfactant had little effect on the metastable zone width.At constant tempera-ture,with the increase of supersaturation,the induction period of crystallization became shorter.However,the addition of sur-factant made the induction period longer.

Key words: carnallite, potassium chloride, surfactant, solubility, metastable zone width, induction period

CLC Number:

TQ131.13

Zhang Liyuan,Wang Gang,Qi Meiling,Xie Yulong. Effect of surfactants on metastable zone and induction period of KCl crystals in carnallite[J]. Inorganic Chemicals Industry, 2020, 52(6): 46-49.

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References 19

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T/℃	物质的量分数x
T/℃	x₁	x₂	x₃	x
10	0.032 7	0.032 2	0.032 8	0.032 6
20	0.035 2	0.034 8	0.034 5	0.034 8
30	0.038 7	0.038 0	0.038 3	0.038 3
40	0.041 8	0.041 6	0.041 8	0.041 7

表面活性剂	T/ ℃	低过饱和度			高过饱和度
表面活性剂	T/ ℃	α	R²	γ/ （mJ·m^-2）	α	R²	γ/ （mJ·m^-2）
空白	20	0.018 49	0.892	9.011	0.829 28	0.904	32.04
阴离子	20	0.026 34	0.979	3.016	0.470 99	0.979	7.887
阳离子	20	0.026 70	0.945	3.030	0.556 83	0.974	8.340
非离子	20	0.026 88	0.939	3.037	0.216 49	0.969	6.080

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Effect of surfactants on metastable zone and induction period of KCl crystals in carnallite

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