摘要
采用MSMPR结晶器研究了不同悬浮密度、氨水浓度和过饱和度下,KNO3在氨-水体系中的结晶动力学特性,并得到KNO3在氨水溶液中的结晶动力学模型。研究结果表明:随着悬浮密度的减少,晶体平均粒径增大,粒径分布变得均匀;氨的浓度增加,结晶成核速率与生长速率均下降,晶体平均粒径减少,但粒径分布变均匀;随着过饱和度的加大,结晶成核速率与生长速率均增加,但晶体平均粒径减小,且粒径分布变差。研究结果可为硝酸钾生产工艺中结晶器的设计提供基础数据。
The effect of different suspension density, ammonia concentration and supersaturation on the kinetics properties of KNO3 crystallization in ammonia - water system were investigated by a MSMPR crystallizer. The crystallization kinetics model is obtained. The experimental results show that with the decrease of suspension density, the crystal mean particle size rises and the crystal size distribution （CSD） becomes well - proportioned; With the increase of ammonia concentration, both the nucleation rate and growth rate of crystal go down and the crystal mean particale size decreases but the CSD becomes symmetrical; With the augment of supersaturation, both the nucleation rate and growth rate of crystal increase but the crystal mean particle size decreases and the CSD of KNO3 becomes worse. The results can supply the basic data for design of crystallizer used in the technology of producing potassium nitrate.
出处
《海湖盐与化工》
北大核心
2006年第3期5-8,共4页
Sea-Lake Salt and Chemical Industry
基金
国家"十五"重点科技攻关项目(2004BA602B-06)河北省基金项目(203017)
关键词
硝酸钾
氨水体系
结晶动力学
potassium nitrate
ammonia - water system
crystallization kinetics
