不同阳离子引起微粒释放的临界盐浓度值

Critical salt concentrations of particle release caused by different cations

摘要: 通过水平渗流试验,以NaCl,KCl,LiCl,NH4Cl,CaCl2和MgCl2溶液为研究对象,分别测定不同阳离子引起微粒释放、导致多孔介质水敏感性发生的临界盐浓度值(CSC)。研究结果表明:临界盐浓度不是一个单一的浓度值,而是一个范围,其中一价阳离子Na+、K+、Li+和NH4+溶液的临界盐浓度分别为0.06±0.005、0.05±0.005、0.05±0.005和0.01±0.005mol/L;在二价阳离子中,Mg2+能引起极其轻微的微粒释放,但是没有明显的临界值,Ca2+不但不能引起微粒释放,而且有强烈地抑制微粒释放的作用,可以认为二价阳离子没有明显的临界盐浓度。

Abstract: With horizontal seepage experiments,this paper analyzes the critical salt concentrations（CSC）of the different cations,by examining such solutions as NaCl,KCl,LiCl,NH4Cl,CaCl2 and MgCl2,which can cause the particle release of water sensitivity of porous media.The research results show that the critical salt concentration is not a single value,but is a range;the critical salt concentrations of monovalent cation solutions of Na+,K+,Li+ and NH4+ are 0.06±0...