磷酸二氢钠结晶过程研究  

Research on crystallization process of sodium dihydrogen phosphate

作　　者：张晓光[1] 

机构地区：[1]宁夏大学化学化工学院,宁夏银川750021

出　　处：《化工矿物与加工》2013年第1期13-16,27,共5页Industrial Minerals & Processing

摘　　要：研究了降温速率、搅拌速率、pH值等因素对磷酸二氢钠结晶的影响,并以诱导期表征晶核形成,以结晶速率表征晶体生长,以粒度分布、长径比衡量晶体形态。研究结果表明,降温速率为0.1～0.15℃/min,搅拌速率为150～200r/min,pH值控制在2.5～3.5时,磷酸二氢钠晶体粒度分布均匀、颗粒大、质量高。本文的研究成果可用于指导湿法磷酸制备磷酸二氢钠工业生产。Theoretical and experimental approaches were under- taken to find out the influence of cooling rate, stirring rate and pH value on the crystallization process of sodium dihydrogen phosphate. Induction period, crystallization rate, particle size distribution were applied to characterize nucleation, crystal growth and crystal morphology, respectively. The experimental results indicated that crystal product of sodium dihydrogen phos- phate was uniform distribution, large size, high quality under the conditions of cooling rate 0.1-0.15 C/min, stirring rate 150- 200 r/min, pt-｜ value 2.5-3.5. The research results described in the paper can be taken as guidance in the industrial production of sodium dihydrogen phosphate by use of wet-process phosphoric acid.

关 键 词：磷酸二氢钠 结晶过程 诱导期 粒度分布 

分 类 号：TQ126.3[化学工程—无机化工]