光卤石中氯化钾溶解度、介穏区、诱导期测定

doi:10.11962/1006-4990.2019-0406

Abstract

Abstract:

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

CLC Number:

TQ131.13

Qi Meiling,Wang Gang,Zhang Liyuan,Xie Yulong. Determination of KCl solubility,interfacial region and induction period in carnallite[J]. Inorganic Chemicals Industry, 2020, 52(5): 45-49.

Figures/Tables 9

References 15

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项目	质量分数/%	含量/g	项目	质量分数/%	含量/g
KCl	21.72	32.66	CaCl₂	0.52	0.01
MgCl₂	23.39	35.17	H₂O	33.50	50.38
NaCl	20.87	31.38	总干盐	66.50	100.00

温度/K	x₁	x₂	x₃	x
273.15	0.024 68	0.024 48	0.024 56	0.024 56
283.15	0.026 33	0.026 34	0.026 31	0.026 33
293.15	0.027 89	0.027 83	0.027 82	0.028 07
303.15	0.029 3 3	0.029 44	0.029 37	0.029 68
313.15	0.031 42	0.031 44	0.031 43	0.031 43

温度/K	成核拟合公式	m	R²
283.15	ln ΔT_max=1.170 8+0.339 1 ln b	2.51	0.963 08
293.15	ln ΔT_max=1.110 8+0.403 3 ln b	2.48	0.969 96
303.15	ln ΔT_max=0.991 8+0.403 3 ln b	2.48	0.975 81
313.15	ln ΔT_max=0.973 3+0.402 1 ln b	2.49	0.987 54
323.15	ln ΔT_max=0.908 4+0.406 4 ln b	2.46	0.983 55

温度/ K	低过饱和度			高过饱和度
温度/ K	α	γ/ （MJ・m^-2）	f	α	γ/ （MJ・m^-2）	f
283.15	0.011 88	2.217 3	0.356 7	0.217 52	5.844 2	0.940 1
293.15	0.011 87	2.295 0	0.356 6	0.228 65	6.152 1	0.955 9
303.15	0.012 59	2.420 3	0.363 7	0.213 16	6.214 9	0.933 8

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Determination of KCl solubility,interfacial region and induction period in carnallite

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