氯化钾在钾石盐溶液中的结晶动力学研究  

Study on crystallization kinetics of potassium chloride in sylvite solution

作　　者：汤毅慧 赵启文[1] 陈得清 TANG Yihui;ZHAO Qiwen;CHEN Deqing(School of Chemical Engineering,Qinghai University,Xining 810016,China)

机构地区：[1]青海大学化工学院,青海西宁810016

出　　处：《青海大学学报》2020年第5期46-51,共6页Journal of Qinghai University

基　　金：国家自然科学基金项目(21666032)。

摘　　要：为了优化热溶结晶法生产氯化钾时的工艺,文中采用间歇动态法,在分析搅拌速率、过饱和度、悬浮密度等参数对氯化钾在钾石盐溶液结晶过程影响的基础上,获得了结晶动力学方程。结果表明:搅拌速率增加会使晶体粒径变小,当搅拌速率不变时,晶体粒径稳定时间为20 min;生长速率和成核速率均随过饱和度的增加而增大,当过饱和度大于0.2432 g/100 g时,晶体粒径增长基本达到稳定。本研究获得了在搅拌速率250 r/min条件下的氯化钾在钾石盐溶液中的结晶动力学方程,对优化热溶结晶法生产氯化钾的工艺提供了理论基础。In order to optimize the production technology of potassium chloride by hot-melt crystallization,intermittent dynamic method is used in this paper so as to obtain the crystallization kinetic equation based on the analysis of the influence of stirring rate,supersaturation and suspension density on the crystallization process of potassium chloride in sylvite solution.The results show that the increase of stirring rate will make the particle size smaller and the stability time of crystal size is 20 minutes when the stirring rate keeps constant.Furthermore,the growth rate and nucleation rate increase with the increasing of supersaturation.The growth of crystal size is basically stable when the supersaturation is greater than 0.2432 g/100 g.The crystallization kinetics equation of potassium chloride in sylvite solution at stirring rate of 250 r/min is obtained in this paper,which provides a theoretical basis for optimizing the process of producing potassium chloride by hot-melt crystallization.

关 键 词：氯化钾 钾石盐 结晶动力学 生长速率 成核速率 

分 类 号：TS396.1[轻工技术与工程]