摘要
膜法海水淡化中钙离子在膜表面沉积形成垢层是提高产水率的瓶颈问题.本文研究了聚合物膜表面的不同物理化学特性对碳酸钙、硫酸钙等难溶钙盐的结晶过程的影响,并分析了其诱导成核机理.结果表明:聚四氟乙烯膜对钙盐晶体的诱导作用最快.膜的孔径在0.45 μm时,对晶体成核的诱导作用最强.花瓣状或球状的球霞石和纤维状或片状的二水硫酸钙分别为碳酸钙和硫酸钙的主要晶型和形貌.
Scaling of calcium salts on membrane surface is a bottleneck in desalination process to increase the efficiency of the water recovery. Several polymer membrane surfaces with different chemistry were used to investigate the mechanism of surface induced nucleation of sparling soluble calcium salts. The results show that flowerlike or sphere vaterite and fiber or plates like gypsum constitute the main forms and morphologies. PVDF membrane has the strongest acceleration effect on the nucleation. Pore size of the membrane at 0.45 μm influences the most on the nucleation.
出处
《河北工业大学学报》
CAS
2016年第3期80-84,共5页
Journal of Hebei University of Technology
基金
河北省自然科学基金(E2014202266)
河北省人社厅留学人员科技活动项目择优资助(C2015003039)
河北省科技计划项目(15273105)
关键词
聚合物
膜
结垢
诱导
成核
碳酸钙
硫酸钙
结晶
polymer
membrane
scaling
induce
nucleation
calcium carbonate
calcium sulfate
crystallization
