脉冲萃取柱筛板表面浸润性的研究  

STUDIES ON THE WETTING PROPERTIES OF PLATE SURFACES USED IN PULSED EXTRACTION COLUMNS

作　　者：邰德荣[1] 杨欣[1] 王欣昌[1] 

机构地区：[1]清华大学核能技术设计研究院

出　　处：《核科学与工程》1991年第4期331-341,6,共11页Nuclear Science and Engineering

摘　　要：本文对30％TBP(煤油)-HNO_3-UO_2(NO_3)_2平衡体系,研究了诸因素下不锈钢筛板表面浸润性随时间的变化。结果表明:筛板在空气中放置50天后,由亲水性变成憎水性;在敞开的两相体系中,由亲水性变成几乎中性;在密闭体系中,可以保持亲水性。对筛板施加超声波作用,不论在何种环境下,均能保持其亲水性。两相界面张力随时间无明显变化,因此可以不必考虑它对浸润性变化的影响。Many factors influence the hydrodynamic characteristics of pulsed column. Of all the factors the surface effect at liquid-liquid interfaces and liquid-solid boundaries may be the most influential factor to the state of droplets. In order to get some understanding of the behaviour of droplets in a pulsed column, it was decided to study the time history of wetting properties of plates under different conditions in 30% TBP (Kerosene) -HNO_3-UO_2 (NO_3)_2—H_2O systems. The results show that the hydrophilic wetting behaviour of the plates changes into the hydrophobic and neutral conditions, respectively after they have been exposed to air and put in the 'open system'within about 50 days after contacting with process solutions. For the case where the access of air is prohibited at the upper organic phase boundary by a well fitting cover, or supersonic pulse cleaning is used to the cartridge, the behaviour of the metal surface stays in the original good hydrophilic wetting condition constant with time. The uranium charged liquid systems can conserve hydrophilic behaviour better than the non—charged systems under identical conditions. It is also found that the interfacial tension is unvaried with time for saturated process systems, hence it has no effects on the variation of wettability.

关 键 词：脉冲筛板柱 萃取 表面浸润性 

分 类 号：TL241[核科学技术—核燃料循环与材料]