A method for reverse liquid injection at the bottom of an ion-type rare earth ore

Abstract

The application discloses a kind of ion type rare earth ore bottom reverse liquid injection methods, comprising the following steps: test the permeability of ore bed, preset an ore bed permeability value;According to the test result of the permeability of ore bed, open injection hole, when the permeability of ore bed tested is greater than the preset permeability value, then using conventional injection hole injection;When the permeability of ore bed tested is less than the preset permeability value, then using reverse injection hole injection;The reverse injection hole penetrates the ore bed from the topsoil layer downward, so that the lower end of the reverse injection hole extends to the boundary between the ore bed and the bedrock;Inject leaching solution, use water pipe to deliver leaching solution to the bottom of reverse injection hole, and soak the ore bed from the bottom of reverse injection hole. The present application has high ore recovery rate, reduces the advantages such as topsoil landslide.

Description

Technical Field

[0001] This invention relates to the field of rare earth ore leaching technology, and in particular to a bottom reverse injection hole and method for ion-type rare earth ore. Background Technology

[0002] Ionic rare earth elements are rare earth elements adsorbed in ionic form onto aluminosilicate minerals, primarily kaolinite, and are a unique type of rare earth found in my country that can be extracted using electrolyte leaching. Ionic rare earth resources are characterized by short mining cycles and low mining value per unit area. In-situ leaching mining technology not only facilitates the recovery of low-grade resources but also effectively protects the mining environment. Therefore, in-situ leaching mining technology is currently being promoted and applied in ionic rare earth mines in southern China.

[0003] Ion-adsorption rare earth mining has gone through pond leaching and heap leaching processes. In response to the shortcomings of these two processes, in-situ leaching technology for mining ion-adsorption rare earth resources was explored starting in the 1980s. Implementing in-situ leaching is not easy, and the key lies in the injection and collection of the leaching solution.

[0004] For ore bodies with a depth of less than 2 meters, injection wells with a diameter of 0.5-0.8 m can be used for injection. For ore bodies with a depth exceeding 2 meters, injection holes with a diameter of 0.15-0.3 m can be used, with 0.2 m being the most commonly used diameter. The injection hole (well) depth is 0.5-1.0 meters from the ore entry point. Φ6mm PVC pipes can be used, with the lower 1m drilled into a perforated pattern and inserted to the bottom of the hole. The pipe wall and the hole wall are filled with brambles or other materials. A quincunx pattern is often used for the injection holes. For large deposits with good permeability, the injection holes (wells) can be arranged in rows and columns, while for small ore bodies or those with poor permeability, a grid pattern can be used. For ore bodies with very low permeability, pressurized injection methods are used to increase the leaching rate. The spacing between injection holes and the row spacing are designed based on the downward penetration rate and the lateral diffusion rate, while the penetration rate and diffusion rate are determined based on core tests and field experiments.

[0005] like Figure 1 Above the ore-bearing layer is topsoil layer 1, and below it is bedrock 4. When the ore layer 3 has good permeability, the conventional injection hole 2 is drilled to a depth of 0.5m into the ore layer, and the leaching solution normally soaks the ore layer 3 without soaking the topsoil layer 1.

[0006] like Figure 2 When the permeability of ore layer 3 is poor, if the following methods are still used... Figure 1 The conventional injection method, which starts injection from a depth of 0.5m in the ore layer 3, results in slow downward penetration of the ore layer and fast upward penetration of the topsoil layer 1. Before the ore layer 3 is fully soaked, the topsoil layer 1 is already partially soaked, resulting in a low ore recovery rate and a high risk of landslides in the topsoil layer 1 of the mining area.

[0007] The disclosure of the foregoing Background is only used to assist in understanding the concept and technical solutions of the present application and does not necessarily constitute the prior art of the present patent application. If there is no explicit evidence that the foregoing is disclosed in the prior art of the present patent application on the filing date of the present patent application, the foregoing background should not be used to evaluate the novelty and inventiveness of the present application. SUMMARY

[0008] The present application aims to provide a novel ion-type rare earth ore bottom reverse liquid injection hole and method with good ore leaching effect and high ore recovery rate.

[0009] To this end, the present application provides an ion-type rare earth ore bottom reverse liquid injection hole and method.

[0010] Preferably, the present application can also have the following technical features:

[0011] An ion-type rare earth ore bottom reverse liquid injection method, comprising the following steps:

[0012] Test the permeability of the ore layer, and preset a permeability value of the ore layer;

[0013] According to the test result of the permeability of the ore layer, a liquid injection hole is opened, when the test result of the permeability of the ore layer is greater than the preset permeability value, a conventional liquid injection hole is used for liquid injection; when the test result of the permeability of the ore layer is less than the preset permeability value, a reverse liquid injection hole is used for liquid injection; the reverse liquid injection hole penetrates the ore layer from the topsoil layer downward, so that the lower end of the reverse liquid injection hole extends to the boundary between the ore layer and the bedrock.

[0014] Inject the ore leaching liquid, and use a water pipe to deliver the ore leaching liquid to the bottom of the reverse liquid injection hole, and then reverse soak the ore layer from the bottom of the reverse liquid injection hole.

[0015] Further, the diameter of the reverse liquid injection hole is 110-180mm.

[0016] Further, the diameter of the reverse liquid injection hole is 120-160mm.

[0017] Further, when testing the permeability of the ore layer, the ore leaching liquid is injected into the conventional liquid injection hole, when the liquid level height of the ore leaching liquid in the conventional liquid injection hole is located at the boundary between the ore layer and the topsoil layer, the liquid level height is maintained within 24 hours, and according to the comparison result of the amount of ore leaching liquid consumed within the 24 hours and the permeability value of the ore layer, it is judged whether the conventional liquid injection hole needs to be rebuilt into a reverse liquid injection hole.

[0018] Further, when the liquid level height of the ore leaching liquid in the conventional liquid injection hole is located at the boundary between the ore layer and the topsoil layer, the ore leaching liquid is added according to the permeation speed of the ore leaching liquid, so that the permeation amount and the added amount are balanced.

[0019] Further, the preset permeability value of the ore layer is 2 cubic meters of ore leaching liquid per 24 hours.

[0020] A method for testing the permeability of a mineral layer, comprising:

[0021] A regular injection hole is drilled in the mine for testing, and leaching solution is injected into the regular injection hole, and when the liquid level of the leaching solution in the regular injection hole reaches the boundary between the mineral layer and the surface soil layer, the liquid level is maintained for 24 hours.

[0022] The amount of leaching solution consumed in the 24 hours is calculated, and if the calculated amount of leaching solution consumed is less than a preset mineral layer permeability value, it indicates that the permeability of the mineral layer is poor, and vice versa.

[0023] Further, the diameter of the regular injection hole for testing is 110-180 mm, and the depth of the regular injection hole into the mineral layer is 500 mm.

[0024] A reverse injection hole for ion-type rare earth ore, the reverse injection hole penetrates the mineral layer from the surface soil layer downward, and the lower end of the reverse injection hole extends to the boundary between the mineral layer and the bedrock.

[0025] Further, the reverse injection hole is vertically arranged, and the diameter of the reverse injection hole is 110-180 mm; the water pipe conveying the leaching solution extends to the bottom of the reverse injection hole.

[0026] The beneficial effects of the present application compared with the prior art include: when the permeability of the mineral layer is poor, the bottom reverse injection method is used. The reverse injection hole penetrates the mineral layer, and the mineral layer is soaked from the bottom to the top, which improves the ore recovery rate and avoids soaking the surface soil layer and landslides. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of the arrangement of a regular injection hole in the prior art, wherein the arrow direction is the direction of the permeation of the leaching solution when the permeability of the mineral layer is good.

[0028] Figure 2 is a schematic diagram of the arrangement of a regular injection hole in the prior art, wherein the arrow direction is the direction of the permeation of the leaching solution when the permeability of the mineral layer is poor.

[0029] Figure 3 is a schematic diagram of the arrangement of a reverse injection hole of the present application, wherein the arrow direction is the direction of the permeation of the leaching solution.

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 1, surface soil layer; 2, regular injection hole; 3, mineral layer; 4, bedrock; 5, reverse injection hole; 6, water pipe. DETAILED DESCRIPTION

[0032] The application will be described in further detail below with reference to the drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the application and its applications.

[0033] With reference to the following drawings, non-limiting and non-exclusive embodiments will be described, in which the same reference numerals denote the same parts, unless otherwise specified.

[0034] With reference to Figure 3 As shown in the figure, a reverse liquid injection method for ion-type rare earth ore bottom, comprising the following steps:

[0035] Test the permeability of the ore layer 3, and preset a permeability value of the ore layer;

[0036] According to the test results of the permeability of the ore layer, the liquid injection hole is opened, when the test results of the permeability of the ore layer are greater than the preset permeability value, the conventional liquid injection hole 2 is used for liquid injection; when the test results of the permeability of the ore layer are less than the preset permeability value, the reverse liquid injection hole 5 is used for liquid injection. The reverse liquid injection hole 5 penetrates the ore layer 3 from the topsoil layer 1 downward, so that the lower end of the reverse liquid injection hole 5 extends to the boundary between the ore layer 3 and the bedrock 4.

[0037] The ore leaching liquid is injected, and the water pipe 6 is used to deliver the ore leaching liquid to the bottom of the reverse liquid injection hole 5, and the ore layer 3 is soaked from the bottom of the reverse liquid injection hole 5. Generally, when the existing conventional liquid injection hole is used for liquid injection, the water pipe 6 for delivering the ore leaching liquid extends to the upper part of the conventional liquid injection hole 2 or extends into the conventional liquid injection hole 2 for a short distance, and the ore leaching liquid starts to be injected, and the ore leaching liquid is soaked in the upper part of the conventional liquid injection hole. In this embodiment, the water pipe 6 for delivering the ore leaching liquid extends to the bottom of the reverse liquid injection hole 5, so that the ore leaching liquid starts to be soaked from the bottom of the reverse liquid injection hole 5.

[0038] By using the water-impermeable characteristics of the bedrock 4, when the ore leaching liquid flows out of the reverse liquid injection hole 5, the ore leaching liquid starts to permeate the ore layer 3 from the boundary between the ore layer 3 and the bedrock 4. On the one hand, the bedrock is water-impermeable, which can effectively recover the ore leaching liquid; on the other hand, the ore leaching liquid slowly rises from the bottom of the reverse liquid injection hole 5, which realizes the upward soaking of the ore leaching liquid from the bottom of the ore layer, effectively avoids the ore leaching liquid from soaking into the topsoil layer 1, reduces the landslide risk of the topsoil layer 1, and fully soaks the ore layer to improve the ore recovery rate.

[0039] Preferably, the diameter of the reverse liquid injection hole 5 is 110-180 mm. When mining, a plurality of liquid injection holes are opened on the mine, and according to the test results of the permeability of the ore layer below each liquid injection hole, the conventional liquid injection hole 2 or the reverse liquid injection hole 5 is selected.

[0040] In the above scheme, when the permeability of the ore bed is tested, the ore leaching liquid is injected into the conventional injection hole, and when the liquid level of the ore leaching liquid in the conventional injection hole 2 is located at the boundary between the ore bed 3 and the surface soil layer 1, the liquid level is maintained for 24 hours. According to the comparison result of the amount of ore leaching liquid consumed in the 24 hours and the ore bed permeability value, it is judged whether the conventional injection hole 2 needs to be further deepened, and the conventional injection hole 2 is converted into a reverse injection hole 5. The diameter of the conventional injection hole is 110-180 mm, and in the embodiment, the diameter of the conventional injection hole used when the permeability of the ore bed is tested is 120 mm, and the depth into the ore bed is 500 mm. When the liquid level of the ore leaching liquid in the conventional injection hole 2 is located at the boundary between the ore bed 3 and the surface soil layer 1, the ore leaching liquid is added according to the permeation speed of the ore leaching liquid, and the permeation amount and the added amount are balanced. Specifically, the preset ore bed permeability value is 2 cubic meters of ore leaching liquid per 24 hours.

[0041] A method for testing the permeability of an ore bed applied in the above reverse injection method, comprising:

[0042] A conventional injection hole 2 for testing is opened in a mine, and ore leaching liquid is injected into the conventional injection hole 2. When the liquid level of the ore leaching liquid in the conventional injection hole 2 is located at the boundary between the ore bed 3 and the surface soil layer 1, the liquid level is maintained for 24 hours.

[0043] The amount of ore leaching liquid consumed in the 24 hours is calculated. If the calculated amount of ore leaching liquid consumed is less than the preset ore bed permeability value, it indicates that the permeability of the ore bed is poor, and the conventional injection hole 2 needs to be processed into a reverse injection hole 5. Otherwise, it indicates that the permeability of the ore bed is good, and the conventional injection hole 2 can continue to be used. Preferably, the diameter of the conventional injection hole 2 for testing is 110-180 mm, preferably 120 mm, and the depth into the ore bed is 500 mm.

[0044] In combination Figure 3 A reverse injection hole for ion-type rare earth ore, the reverse injection hole 5 penetrates the ore bed 3 from the surface soil layer 1 downward, so that the lower end of the reverse injection hole 5 extends to the boundary between the ore bed 3 and the bedrock 4. Preferably, the reverse injection hole 5 is vertically arranged, and the diameter thereof is 110-180 mm, preferably 120 mm. The water pipe 6 for conveying ore leaching liquid extends to the bottom of the reverse injection hole 5, and the ore leaching liquid is soaked upward from the bottom of the reverse injection hole 5 to the ore bed 3.

[0045] In the mining example of a certain mining area of Huashan rare earth ore: when the permeability is less than 1 m 3In the case of ore body injection at a depth of 1 meter, if conventional injection hole 2 is used for top-down injection, the recovery rate is only 36-59%. However, by using the reverse injection hole 5 of this invention for bottom-up injection, the recovery rate increases to 78-86%. This demonstrates that when the ore layer permeability is low, the reverse injection hole 5 injection scheme of this invention significantly improves the recovery rate compared to the conventional injection hole 2 scheme, resulting in good economic benefits. (Note: The last sentence appears to be incomplete and possibly refers to a 1m...) 3 / Kong.Tianzhi injection hole is soaked with 1 cubic meter of leaching solution every 24 hours.

[0046] Those skilled in the art will recognize that numerous variations are possible with respect to the above description, and the embodiments and figures are merely for describing one or more specific implementations.

[0047] Although exemplary embodiments of the invention have been described and illustrated, those skilled in the art will understand that various changes and substitutions can be made thereto without departing from the spirit of the invention. Furthermore, many modifications can be made to adapt specific situations to the doctrine of the invention without departing from the central concepts of the invention described herein. Therefore, the invention is not limited to the specific embodiments disclosed herein, but may include all embodiments and equivalents that fall within the scope of the invention.

Claims

1. A bottom reverse injection method for ion-adsorption rare earth ores, characterized in that: Includes the following steps: Test the permeability of the ore layer, and preset a ore layer permeability value; The preset leaching value for the ore layer is 2 cubic meters of leaching solution every 24 hours; Injection holes are opened based on the ore layer permeability test results. If the tested ore layer permeability is greater than the preset permeability value, conventional injection holes are used for injection. When the tested permeability of the ore layer is less than the preset permeability value, reverse injection holes are used for injection; the reverse injection holes penetrate the ore layer from the topsoil layer downwards, so that the lower end of the reverse injection holes extends to the boundary between the ore layer and the bedrock. Inject leaching solution and use water pipes to transport the leaching solution to the bottom of the reverse injection hole, and leach the ore layer from the bottom of the reverse injection hole. The method for testing the permeability of a mineral seam includes the following steps: A conventional injection hole for testing is opened in the mine. Leaching solution is injected into the conventional injection hole. When the liquid level of the leaching solution in the conventional injection hole is at the boundary between the ore layer and the topsoil layer, leaching solution is added according to the leaching rate to keep the leaching amount and the added amount in balance, and the liquid level is maintained for 24 hours. Calculate the amount of leaching solution consumed within 24 hours. If the calculated amount of leaching solution consumed is less than the preset leaching value of the ore layer, it indicates that the ore layer has poor permeability. The conventional injection hole should be processed into a reverse injection hole. Conversely, it indicates that the ore layer has good permeability, and conventional injection holes can continue to be used.

2. The bottom reverse injection method for ion-adsorption rare earth ore as described in claim 1, characterized in that: The diameter of the reverse injection hole is 110–180 mm.

3. The bottom reverse injection method for ion-adsorption rare earth ores as described in claim 2, characterized in that: The diameter of the reverse injection hole is 120-160 mm.

4. The bottom reverse injection method for ion-adsorption rare earth ores as described in claim 1, characterized in that: The diameter of the conventional injection hole used for testing is 110-180 mm, and it extends 500 mm into the ore layer.

5. The bottom reverse injection method for ion-adsorption rare earth ores as described in claim 1, characterized in that: The reverse injection hole is set vertically, and the water pipe for conveying the leaching solution extends to the bottom of the reverse injection hole.

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