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在进行粘土、高岭土和蒙脱石三种胶体在含水介质中沉积和释放试验的基础上,重点研究不同种类胶体在含水介质中迁移、沉积和释放的差异性,同时探讨了胶体的迁移-沉积机理。结果表明,相对于粘土胶体和蒙脱石胶体,高岭土胶体最不容易在含水介质中迁移。胶体开始释放浓度随孔隙体积数的增大迅速降低,随后变化缓慢,最后趋于稳定。粘土、蒙脱石和高岭土三种胶体的总沉积率分别为28.91%、30.94%和56.13%,释放总量分别占总沉积量的41.14%、26.88%和77.53%,表明沉积在含水介质固体颗粒表面的胶体不容易完全释放出来。胶体本身的结构组成与表面化学特征的差异和空间排斥效应很好地揭示了胶体不同的迁移-沉积特征。
Based on the experiments of sedimentation and release of three colloids, clay, kaolin and montmorillonite in aqueous media, the differences of migration, deposition and release of different colloids in aqueous media were studied. The migration and deposition of colloids mechanism. The results show that kaolinite colloid is the least susceptible to migration in aqueous media relative to clay colloids and montmorillonite colloids. The initial release concentration of colloids decreased rapidly with the increase of pore volume, then changed slowly, finally stabilized. The total deposition rates of clay, montmorillonite and kaolin clay were 28.91%, 30.94% and 56.13%, respectively, and the total amount of release accounted for 41.14%, 26.88% and 77.53% of the total sediment respectively. The colloid is not easy to release completely. The differences in the composition of the colloids and the surface chemical features and the spatial exclusion effect reveal well the different migration-sedimentation characteristics of the colloids.