水化学作用对颗粒释放的影响  

Influence of hydro-chemical action on particle release

作　　者：王瑛[1] 韩志勇[2] 陈继红[2] 李梦[2] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]兰州理工大学石油化工学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2009年第4期57-60,共4页Journal of Lanzhou University of Technology

基　　金：甘肃省自然科学基金(ZS022-A25-025)

摘　　要：通过批量试验,对一价阳离子浓度(Na+浓度),二价阳离子浓度(Ca2+浓度)和pH值三个最常见水化学因素对砂柱中粘土颗粒释放的影响进行研究.试验结果表明:当加入的NaCl溶液从高浓度降到临界盐浓度以下时,砂柱中会产生颗粒释放现象;混合盐溶液中,Ca2+的存在会抑制颗粒的释放,即颗粒释放的临界离子强度值随着Ca2+浓度的增加而降低;在同等条件下,溶液pH值越低,颗粒释放量越少;pH值越高,颗粒释放量越多.The effect of three most commion hydro-chemical factors—univalent cation concentration（Na＋ ion concentration）,bivalent cation concentration（Ca2＋ ion concentration） and the value of pH — on the release of particle was investigated by means of series experiments.Results showed that the particles release from sand column took place when the concentration of added NaCl solution reached the critical value;in the NaCl/CaCl2 solution,the existence of Ca2＋ could restrain the particle release,meaning that the critical value of the total ionic intensity would decrease with the mass fraction of Ca^2＋ ; at the same condition, the lower the value of pH in solution, the less the total quantity of particle release; the higher the pH, the more the quantity of particle release.

关 键 词：水化学 颗粒释放 临界盐浓度 临界离子强度 

分 类 号：X523[环境科学与工程—环境工程]