Rude ore mining method for ion type RE ore

Abstract

The present invention discloses one kind of rude ore mining method for ion type RE ore, and the rude ore mining method includes static pressure injecting liquid via geotechnical engineering process, establishing impermeable layer in the bottom of ore block, and forming V-shaped draining holes, liquid injecting holes, tunnel, impermeable layer, etc. in the mine mount. The technological scheme includes proving up the RE ore bed thickness, establishing tunnel in the bottom of the rich ore, setting V-shaped draining holes, setting impermeable layer or transverse draining holes below the V-shaped draining holes, setting liquid injecting holes or tunnels for layer by layer injecting and collecting. The present invention can avoid the adsorption of soil to RE ion and water and soil loss caused by mining.

Description

Technical field [0001] The present invention relates to a mining method of ion-type rare earth ore mining (ion-adsorption type rare earth ore leaching), specifically applying the static pressure grouting method commonly used in geotechnical engineering to inject liquid in the original mountain leaching mining. Build an anti-seepage layer at the bottom of the ore deposit; and adopt layered liquid injection method and layered liquid collection method when injecting liquid in the ore bed. Background technique [0002] The known ion-adsorption type rare earth ore former mountain leaching method is made up of liquid injection holes, tunnels and drainage holes arranged above the impermeable layer at the foot of the mountain or the soil layer containing groundwater (see figure 1 ). When chemical reagents (now (NH 4 ) 2 SO 4 For example, the same below) After injecting from the liquid injection hole on the top of the mountain, it penetrates into t...

AI Technical Summary

Problems solved by technology

The shortcoming of this method is: 1. because the rare earth ore layer is mainly distributed in the strong weathered layer of the mountain body above the mountainside, the rare earth ore content of the mountain body below the mountainside is low or has no rare earth ore, and when the rare earth solution penetrates into this layer, the rare earth ion is absorbed by the soil colloid A large amount of adsorption, the rare earth grade of the solution that finally flows into the tunnel is very low, if the adsorbed rare earth is to be leached out, it is necessary to increase (NH 4 ) 2 SO 4 and the amount of water; or when the permeability coefficient of the soil layer under the tunnel is large, the rare earth solution will infiltrate into the soil layer below the tunnel, resulting in less rare earth solution collected

2. The shallow injection method has the following shortcomings: a. Due to the structure of the mountain, the inhomogeneity of the permeability coefficient of each part of the mountain body, the same method of injection at the same time at the same time, the place with a small permeability coefficient (NH 4 ) 2 SO 4 Solution penetration is less, most (NH 4 ) 2 SO 4 The solution infiltrates along the soil layer with high permeability coefficient of the mountain

b. As we all know, within a certain period of time, the amount of positive ions adsorbed is proportional to the time. The longer the time, the more positive ions are absorbed. When the thickness of the ore layer exceeds a certain thickness, or the permeability coefficient of the soil layer is small, Inject from the injection hole (NH 4 ) 2 SO 4 It takes a long time for the solution to penetrate into the tunnel at the bottom of the mine, which causes a large amount of NH to be adsorbed on the soil above the tunnel 4 + , such as the underlying ore layer to achieve the NH required in the rare earth leaching process 4 + concentration, a large amount of injection is required (NH 4 ) 2 SO 4 the solution

From the above reasons, it can be seen that due to the adsorption of soil colloids, it will adsorb (NH 4 ) 2 SO 4 ammonium ions in solution, which leads to (NH 4 ) 2 SO 4 The amount of water and water is increased, and the increase of water amount leads to the low grade of rare earth in the rare earth solution flowing into the tunnel, so that the production cost is high; at the same time, due to the excessive and fast injection of liquid, it is easy to cause landslides and cause environmental problems.

Images