Study On The Influencing Factors And Regularity Of Ionic Rare Earth Capillary Rise

Ionic rare earth is characteristic of the mineral resources in China,it's widely used in-situ leaching mining process that belongs to the protective exploitation of mineral resources.Expecting to minimize losses from capillary cause the waste of resources,the engineering background was based on the study of in-situ leaching of ionic type rare-earth capillary loss phenomenon in the process of mining.On the basis of homemade capillary test apparatus,the test to study on effective factors of capillary rise of ion-absorbed rare earth ore and its laws have been done in laboratory,and the research object is the rare earth ions of a mine in Xunwu.There is a total of three kinds of exchange liquid as follows:water and concentration of ammonium sulfate solution for 3%and 5%.Soil samples were the maximum diameter of 4.75 mm,1.18 mm,0.6 mm and 0.3 mm.the following conclusions are obtained:(1)Under water capillary rise in ionic rare earth,the values of capillary permeability coefficient decrease and the maximum height of capillary rise increase gradually with increasing the maximum particle size of soils.For the ionic rare earth of the same particle size,the value of capillary permeability coefficient is less than saturated permeability coefficient.Capillary rise velocity takes on a rapid decline at first,and then slowly decreasing trend over time.With increasing the maximum particle size of soils,the values of capillary permeability coefficient was decrease gradually,but the maximum height of capillary rise increase.It's negative correlation between the maximum height of capillary rise and capillary permeability coefficient.(2)Excepting for the maximum particle size of soil samples 4.75mm,test results showed that the maximum height of capillary rise of 1.18mm,0.6mm,0.3mm is deeply influenced by the concentration of solution.For the perspective of in order to reduce the loss of in situ leaching capillary,3%ammonium sulfate solution been suggested.(3)The gravity of exchange liquid was blocking effect to the capillary rise,and also a decisive factor lead to not equal distance between capillary rise height and horizontal diffusion within the same time.In the process of capillary rise,in order to achieve the purpose of reducing the capillary loss and improving the economic benefit,the preparation of concentration of the injected liquid can be appropriately raised under the premise of not affecting the efficiency of rare earth ion exchange.(4)Based on the assumption of the distribution of moisture content was changed as linear,theoretical analysis shows that capillary infiltration rate was positively correlated with capillary rate and moisture content.Hydraulic change and energy transfer in the process of capillary are not only the fundamental cause of capillary phenomenon,but it's also an important component of the analysis of the capillary mechanism.In the process of capillary rise,hydraulic change is mainly reflected in the soil moisture content and matrix suction,and the relationship in the process of the transformation are narrowing the hydraulic gradient and eventually make the capillary action to stabilize.