氯化铷结晶介稳区宽度与生长动力学研究

摘要/Abstract

摘要： 为获得氯化铷工艺设计和建模所需结晶动力学参数,在等温间歇冷却实验装置中,采用浊度计测量氯化铷水溶液体系的介稳区宽度,加入晶种间歇冷却结晶实验测量氯化铷溶液过饱和度变化曲线,研究了氯化铷水溶液体系介稳区宽度和生长动力学。该体系的介稳区宽度随饱和温度升高而变宽,随搅拌速率的增加而变窄,随冷却速率增大而变宽。采用自洽Nvlt介稳区方程计算得到氯化铷成核级数和成核速率常数,成核级数小于3,为瞬时成核;且成核级数和成核常数均随着饱和温度的升高而增大,说明成核速率随温度的升高而增大。当加入晶种的量超过一定数,溶液的过饱和度快速下降;根据过饱和度变化曲线计算得到了氯化铷晶体生长动力学参数。晶体生长指数在实验温度范围内接近2,晶体生长速率常数随结晶温度的升高而增大。

关键词: 氯化铷晶体, 介稳区宽度, 冷却结晶, 过饱和曲线, 生长动力学

Abstract: In order to obtain dynamics parameters for the purpose of crystallization process design and modeling of rubidium chloride, it was investigated that crystallization metastable zone width and growth kinetic of rubidium chloride. The turbidity meter was used to detect the metastable zone width of the aqueous solution system under different linear cooling in an isothermal batch cooling experimental device. And the desupersaturation of rubidium chloride solution with time was measured by adding seed crystal to supersaturated solution at a certain temperature. The metastable zone width of the system increase with the increase of saturation temperature, decrease with the increase of stirring rate, and increase with the increase of cooling rate. The nucleation order and nucleation rate constant of rubidium chloride were obtained by the self-consistent equation of metastable zone width. The nucleation order value is less than 3, indicating that it is instantaneous nucleation. The nucleation order and nucleation constant both increase with the increase of saturation temperature, indicating that the nucleation rate increased with the increase of temperature. When the amount of seed added exceeds a certain amount, the supersaturation of the solution decreases rapidly. According to the supersaturation curve, the growth kinetics of rubidium chloride crystal were calculated. And the growth exponent is about 2 in the experimental temperature range. The constant of crystal growth rate increases with the increase of crystallization temperature.

Key words: rubidium chloride crystal, metastable zone width, cooling crystallization, desupersaturation curve, growth kinetic

中图分类号:

肖海, 曾向东, 曾英, 熊国元, 赵淑芳, 张学宁. 氯化铷结晶介稳区宽度与生长动力学研究[J]. 人工晶体学报, 2024, 53(12): 2141-2149.

XIAO Hai, ZENG Xiangdong, ZENG Ying, XIONG Guoyuan, ZHAO Shufang, ZHANG Xuening. Crystallization Metastable Zone Width and Growth Kinetic of Rubidium Chloride[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(12): 2141-2149.

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