为研究含氟岩层地下水中氟的迁移与富集特性，以包头市包钢尾矿坝附近浅层含水层为研究区，采用三类室内试验分别模拟了不同岩性含氟地下水迁移特性、离子强度对地下水氟滞留影响及雨水对氟的淋滤作用。研究结果表明：氟在不同岩样中的迁移特性不同，同时与颗粒级配存在一定的相关关系，氟迁移能力由强至弱依次是中粗沙、粉细沙、黏沙土和沙黏土；对固液相界面上 F -浓度影响最大的离子是 Ca2+，但影响程度有限；含氟较高岩样的淋滤量较多，随着黏粒含量增多，淋滤比例相对减少。%In order to research the characteristics of fluorine migration and enrichment in groundwater aquifer within higher fluoride environment, taking Baotou City as research area,this paper applied three experiments to simulate the migration characteristics of groundwater with fluoride in different lithology,the effect of ionic strength on fluoride retention and leaching action of rainwater. The experimental results show that:a)the mi-gration characteristics of fluoride are different in different lithology and have some correlation with grain size distribution. The migration ability from stronger to weaker is middle coarse sand,silt and fine sand,sandy soil and sandy clay;b)the most influent factor of F-concentration on the inter-face between solid and liquid is Ca2 + ionic,but the effect is limit;c)the higher fluoride background value of the rock sample has high leaching a-mount and the leaching proportion decreases relatively with the increase of clay content.
展开▼
