离子型稀土溶浸液毛细上升规律及影响因素研究

利用自制毛细试验装置,以寻乌某矿的离子型稀土为试验对象,采用3种不同浓度溶浸液,对4组不同粒径的稀土进行毛细上升试验。结果表明,毛细上升高度随时间增长的变化趋势一致,先快速上升,后缓慢上升,再趋于稳定;土样粒径和溶浸液浓度对毛细上升有影响;当土样粒径不同时,硫酸铵溶液浓度对毛细上升的敏感性各不相同,粒径越大,影响越小;溶质势对毛细现象有促进作用,浓度越大,作用越明显;最大毛细上升高度随土柱最大粒径的增大而减小,二者呈幂函数关系,毛细渗透系数随土样最大粒径的增大而增大,二者呈指数关系。

The study on effective factors of capillary rise of ion-absorbed rare earth and its laws

Ion-adsorption rare earth is protective and strategic mineral resources of China. The capillarity in the process of in-situ leaching mining will affect the leaching result of rare earth ions, and lead to waste of resources and environmental pollution. Based on the self-made capillary test device, four kinds of different particle size of Xunwu ion-adsorption rare earth has been test in three different concentration solution. The results indicate that the different kind of test has the same trend of capillary rise as time growth, which is the height of capillary rise first rises rapidly, and then increases slowly, and then tends to be stable. When the soil particle size is different, the sensitivity of the concentration of ammonium sulfate solution to the capillary rise is different, the bigger the particle size is, the smaller the influence is. The solute potential has a promoting effect on the capillary phenomenon, the greater the concentration, the more obvious effect. This paper predicts the maximum capillary rise height and the value decreases with the increase of soil particle size, which presents also a power function. The capillary permeability coefficient increases with the increase of soil particle size, which presents also a exponential relationship. The maximum capillary rise height and the capillary permeability coefficient is correlated negatively.