Ion type rare earth ore magnetic field reinforced leaching test device and test method thereof

Abstract

The present application relates to a kind of ion type rare earth ore magnetic field intensification leaching test device and its test method, the ion type rare earth ore magnetic field intensification leaching test device includes magnetic field generation module, rare earth leaching module and control acquisition module, the control acquisition module is electrically connected with the magnetic field generation module and rare earth leaching module.Magnetic field generation module can set magnetic field intensity, pulse, frequency, gradient, direction and other parameters, create various magnetic field environment;Rare earth leaching module can fully simulate the high osmotic pressure leaching environment of deep buried rare earth ore layer, solve the test environment reproduction problem of low permeability difficult leaching ore layer, leaching liquid injection parameter accurate control, leaching effluent efficient collection, reduce the influence of test environment on test result;Control acquisition module can identify the diffusion path of seepage in initial stage of leaching, and the seepage deviation characteristics generated under the action of magnetic field driving.

Description

Technical Field

[0001] This invention relates to the field of efficient mining technology for ion-adsorption rare earth mines, and in particular to a magnetic field-enhanced leaching test device and test method for ion-adsorption rare earth mines. Background Technology

[0002] Ion-adsorption rare earth minerals, also known as weathering crust leaching rare earth minerals, are dominated by medium and heavy rare earth elements and have advantages such as complete composition, low radioactivity, and high comprehensive utilization value. These rare earth elements are adsorbed on the surface of clay minerals in the form of hydrated or hydroxyl hydrated cations and can be desorbed by more chemically reactive cations, such as NH4+. 4+ Na + Mg 2+ Ca 2+ Al 3+ Therefore, this type of deposit can be efficiently mined using solution leaching mining methods.

[0003] With the increasing demands for environmental protection and advancements in mining technology, ion-adsorption rare earth deposits are now primarily mined using in-situ leaching. This process involves excavating injection wells and holes within the ore body, injecting leaching agents into them, and then allowing the rare earth minerals within the ore body to undergo leaching processes such as wetting and dissolution, ion exchange, solute diffusion, and seepage transport. The leaching solution, along with the leaching agent, flows through guide holes and collection holes, converging into collection tunnels and collection ditches to obtain the rare earth mother liquor.

[0004] Mineral leaching processes are significantly influenced by geological characteristics, with common low-permeability and difficult-to-leach areas. In-situ leaching often results in leaching blind zones, limiting rare earth resource recovery rates and causing substantial resource waste. Using an additional physical field is a commonly used leaching enhancement method. This method does not change the type of leaching agent, introduce new impurity ions, or affect subsequent processes such as mother liquor enrichment, separation, and purification. A magnetic field can reduce the viscosity and surface tension of the solution, enhancing the dissolution of sparingly soluble salts and ion exchange, thereby accelerating the leaching rate and improving the leaching effect. A magnetic field can also lower the activation energy of the leaching reaction, increasing leaching efficiency and speed. Under the influence of a magnetic field, ionic solutions generate eddies biased to one side, reducing the thickness of the diffusion layer and its concentration polarization, thus increasing the solute diffusion coefficient. Furthermore, while altering the physicochemical properties of the solution, the magnetic field also increases its permeability coefficient within the pore structure of rare earth ore layers, thus enhancing permeability. By rationally controlling parameters such as magnetic field strength, pulse, frequency, gradient, and direction, the recovery efficiency of the leachate can be improved.

[0005] Existing magnetic field-enhanced leaching or seepage testing devices and methods primarily focus on small-scale samples or specimens, placing them inside electromagnetic coils or magnetic poles to adjust the magnetic field environment and then exploring the leaching or seepage characteristics of minerals in the samples. This current situation results in several shortcomings in existing methods: 1. The effect of a magnetic field involves parameters such as magnetic field strength, pulse, frequency, gradient, and direction. Existing research mainly focuses on magnetic field strength, which cannot fully explore and investigate the potential of magnetic field-enhanced leaching; 2. While altering the physicochemical properties of the solution, the magnetic field also increases its permeability coefficient in the pore structure of rare earth mineral layers, thus exerting a permeability-enhancing effect. Existing techniques struggle to explore the driving effect or permeability-enhancing effect of the magnetic field within the mineral layer; 3. Existing rare earth leaching tests and their physical field enhancement test techniques mainly employ atmospheric pressure leaching, making it difficult to reproduce the high permeability pressure environment of deeply buried rare earth mineral layers.

[0006] Therefore, how to provide an environment that can better simulate the actual leaching process and provide a multi-parameter adjustable magnetic field has become an urgent problem to be solved. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention provides a magnetic field enhanced leaching test device for ion-type rare earth minerals. The magnetic field enhanced leaching test device for ion-type rare earth minerals includes a magnetic field generating module, a rare earth leaching module, and a control and acquisition module. The control and acquisition module is electrically connected to the magnetic field generating module and the rare earth leaching module. The rare earth leaching module includes a leaching simulation box, which is disposed inside the magnetic field generating module.

[0008] This invention provides an external magnetic field to the rare earth leaching module through a magnetic field generating module, and controls parameters such as magnetic field strength, pulse, frequency, gradient, and direction during the experiment through a control and acquisition module, and collects the pressure of the rare earth leaching module, the seepage and diffusion path of the leaching liquid, and the liquid level of the leaching liquid in real time.

[0009] As a preferred embodiment of the present invention, the magnetic field generating module includes a Helmholtz coil.

[0010] Preferably, the magnetic field generating module further includes a programmable frequency converter, a shielded wire, and a magnetic field support. The programmable frequency converter is electrically connected to the Helmholtz coil through the shielded wire, and the Helmholtz coil is fixed on the magnetic field support.

[0011] The programmable frequency converter of the present invention programs the power supply and transmits electrical energy to the Helmholtz coil fixed on the magnetic field support through the shielded wire, which can provide a uniform, pulsed, gradient, high and low frequency, weak and medium strong magnetic field environment in the magnetic field space.

[0012] As a preferred technical solution of the present invention, the rare earth leaching module further includes a pressure-stabilizing gas source, a stirring pressure storage tank, a liquid delivery pipeline, a leaching simulation box, a square liquid collector, and a liquid collection cylinder. The pressure-stabilizing gas source is connected to the stirring pressure storage tank through a pipeline, and the stirring pressure storage tank is connected to the leaching simulation box through a liquid delivery pipeline.

[0013] As a preferred embodiment of the present invention, a pressure gauge is provided at the gas outlet of the pressure-stabilized gas source.

[0014] The pressure-stabilized gas source of this invention provides a stable driving force for the flow of leaching liquid and constructs a rare earth leaching environment, realizing the simulation of high permeability environment leaching in deeply buried rare earth ore layers. The pressure gauge can control the gas source pressure and monitor the pressure in real time.

[0015] As a preferred embodiment of the present invention, the stirring pressure storage tank is equipped with stirring blades.

[0016] This invention utilizes a stirring paddle inside a pressure storage tank to maintain stirring after the leaching agent is poured in, ensuring that the leaching process remains uniform and stable.

[0017] As a preferred technical solution of the present invention, the leaching simulation tank is provided with a sealing cover, and the sealing cover is provided with an exhaust valve.

[0018] As a preferred technical solution of the present invention, the leaching simulation tank is provided with a rectangular perforated filter plate, a square liquid collector and a liquid collecting cylinder in sequence.

[0019] Preferably, the number of square liquid collectors and liquid collecting cylinders is the same, and the square liquid collectors and liquid collecting cylinders are evenly arranged below the rectangular perforated filter plate.

[0020] This invention separates the rare earth mineral layer from the square liquid collector using a rectangular perforated filter plate. Each square liquid collector has a liquid collection cylinder below it. By observing the liquid level distribution of the leachate in the liquid collection cylinder, the seepage displacement characteristics of the leachate driven by the magnetic field can be monitored.

[0021] As a preferred technical solution of the present invention, the control acquisition module includes a control acquisition system and a vision acquisition device, wherein the control acquisition system is electrically connected to a programmable frequency converter, a pressure gauge of a regulated gas source, and the vision acquisition device.

[0022] As a preferred technical solution of the present invention, the visual acquisition device collects the seepage diffusion path and the liquid level height of the leachate in the rare earth leaching module, and studies the leaching trend of magnetic field-enhanced leaching by the seepage diffusion path and the distribution of the leachate in the complex magnetic field.

[0023] Secondly, the present invention provides a method for conducting tests using the magnetic field-enhanced leaching test apparatus for ion-type rare earth minerals as described in the first aspect, the method comprising the following steps:

[0024] S1: Rare earth samples were retrieved from the site and pretreated, and then reconstructed layer by layer in a leaching simulation chamber;

[0025] S2: Prepare the leaching solution according to the leaching plan, and inject it into the stirring pressure storage tank. Turn on the stirrer to keep the leaching solution uniform and stable.

[0026] S3: Start the pressure stabilizing air source to bring the air pressure inside the stirring pressure storage tank to the preset value;

[0027] S4: Start the pre-programmed programmable frequency converter and generate a magnetic field;

[0028] S5: Position the vision acquisition device facing the immersion simulation chamber, ensure it is stable, and start the machine.

[0029] S6: Open the exhaust valve and quickly inject the leaching solution. After the air in the upper part of the rare earth ore layer is exhausted, close the valve and start continuously injecting the leaching solution.

[0030] As a preferred technical solution of the present invention, after starting the programmable frequency converter, the magnetic field strength in the magnetic field space is checked using a magnetic field monitoring instrument.

[0031] Preferably, the pretreatment includes taking samples of rare earth ore and then sequentially performing processes such as sun-drying, drying, sieving, and mixing.

[0032] Compared with the prior art, the present invention has at least the following beneficial effects:

[0033] (1) This invention uses a large-size rare earth mineral layer sample in conjunction with a rectangular electromagnetic coil. During the experiment, the magnetic field strength, pulse, frequency, gradient, direction and other parameters can be adjusted to create various magnetic field environments and study the influence of complex magnetic fields on the enhanced leaching effect.

[0034] (2) The leaching simulation box of the present invention can use a square rare earth mineral layer sample, combined with a square liquid collector and a liquid collection cylinder arranged in a uniform manner. Through visual inspection, the diffusion path and seepage deviation characteristics of the liquid flow in the initial and stable stages of leaching can be detected in real time, which is convenient for further study on the influence of different magnetic fields on the seepage of the liquid flow in the leaching process.

[0035] (3) The pressure column leaching method used in this invention can fully simulate the high permeability leaching environment of deep-buried rare earth mineral layers, and solve the problem of reproducing the test environment of low-permeability and difficult-to-leach mineral layers. The permeability coefficient of low-permeability and difficult-to-leach mineral layers is low, the seepage velocity of the leaching liquid in the normal pressure environment is slow, the test cycle is long, and the collection and weighing of the leaching liquid are easily affected by the indoor environment, which affects the test results. The pressure column leaching method can shorten the test cycle and alleviate the influence of the test environment on the leaching liquid volatilization, loss and other factors on the test results. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the magnetic field-enhanced leaching test device for ion-type rare earth minerals provided in Embodiment 1 of the present invention;

[0037] Figure 2 This is a schematic diagram of the magnetic field generating module of the magnetic field enhanced leaching test device for ion-type rare earth minerals provided in Embodiment 1 of the present invention;

[0038] Figure 3 This is a schematic diagram of the rare earth leaching module and control acquisition module of the magnetic field-enhanced leaching test device for ion-type rare earth minerals provided in Embodiment 1 of the present invention.

[0039] Figure 4 This is a schematic diagram of the leaching simulation box structure of the magnetic field-enhanced leaching test device for ion-type rare earth minerals provided in Embodiment 1 of the present invention;

[0040] Figure 5 This is a schematic diagram of the disassembly of the leaching simulation box of the magnetic field-enhanced leaching test device for ion-type rare earth minerals provided in Embodiment 1 of the present invention;

[0041] Figure 6 This is a comparison chart of leached rare earth concentrations under 0T and 1T magnetic field strengths obtained by the test method provided in Example 1 of this invention.

[0042] Figure 7 This is a comparison chart of leached rare earth concentrations under 0T and 5T magnetic field strengths obtained by the test method provided in Example 1 of this invention.

[0043] Figure 8 This is a diagram showing the evolution of the wetting line of the extract obtained by testing the experimental method provided in Example 1 of this invention;

[0044] Figure 9 This is a diagram showing the liquid level distribution of the leachate in the measuring cylinder obtained by the test method provided in Example 1 of this invention.

[0045] Figure 10 This is a seepage velocity diagram obtained by testing using the experimental method provided in Example 1 of this invention;

[0046] Among them: 11. Programmable frequency converter, 12. Shielded wire, 13. Helmholtz coil, 14. Magnetic field support, 21. Stabilized gas source, 22. Stirring pressure storage tank, 23. Infusion pipeline, 24. Leaching simulation box, 25. Square liquid collector, 26. Liquid collecting cylinder, 27. Pressure gauge, 28. Sealing cover, 29. Exhaust valve, 210. Liquid injection port, 211. Rare earth mineral layer, 212. Rectangular perforated filter plate, 31. Control and acquisition system, 32. Vision acquisition device. Detailed Implementation

[0047] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the following examples are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

[0048] Example 1

[0049] This embodiment provides a magnetic field-enhanced leaching test device for ion-type rare earth minerals, including a magnetic field generation module, a rare earth leaching module, and a control and acquisition module.

[0050] like Figure 1 and Figure 2 As shown, the magnetic field generating module includes a programmable frequency converter 11, a shielded wire 12, a Helmholtz coil 13, and a magnetic field support 14. The programmable frequency converter 11 programs the power supply and transmits electrical energy through the shielded wire 12 to the Helmholtz coil 13 fixed on the magnetic field support 14, which can provide a uniform, pulsed, gradient, high and low frequency, and weak to medium strong magnetic field environment in the magnetic field space.

[0051] The rare earth leaching module includes, for example: Figure 3 The pressure-stabilizing gas source 21, stirring pressure storage tank 22, infusion pipeline 23, and leaching simulation chamber 24 shown are as follows: Figure 4 The square liquid collector 25 and the liquid collecting cylinder 26 are shown. The prepared rare earth leaching agent is introduced into the stirring pressure storage tank 22 and stirred to maintain the uniformity and stability of the leaching solution. The regulated pressure stabilizing gas source 21 is connected to the stirring pressure storage tank 22 to provide a stable driving force for the flow of the leaching solution. The stirring pressure storage tank 22 is connected to the leaching simulation box 24 through the liquid delivery pipe 23 to provide a stable pressure injection and rare earth leaching environment, realizing the simulation of leaching in a high-permeability environment of deeply buried rare earth ore layers.

[0052] like Figure 3 As shown, the pressure-stabilized gas source 21 is equipped with a pressure gauge 27, which can control the gas source pressure and monitor the pressure in real time.

[0053] The stirring pressure storage tank 22 is equipped with stirring blades. After the leaching agent is poured in, stirring is maintained to ensure that the leaching remains uniform and stable.

[0054] like Figure 4 As shown, the leaching simulation chamber 24 is equipped with a sealing cover 28, which provides a sealed environment for the injection of rare earth mineral layer 211. At the same time, the sealing cover 28 is equipped with an exhaust valve 29, which can discharge the air inside the leaching simulation chamber 24 at the beginning of the injection stage.

[0055] like Figure 5As shown, a rectangular perforated filter plate 212 is provided at the bottom of the leaching simulation box 24 to separate the rare earth ore layer 211 from the square liquid collector 25. The square liquid collector 25 is located at the bottom of the leaching simulation box 24 to collect the leaching liquid seeping from the ore layer and guide it into the liquid collection cylinder 26. The liquid collection cylinders 26 are arranged at intervals to identify the seepage displacement characteristics of the leaching liquid in the rare earth ore layer 211 driven by the magnetic field.

[0056] like Figure 1 As shown, the control and acquisition module includes a control and acquisition system 31 and a vision acquisition device 32. The control and acquisition system 31 can program the power supply for the programmable frequency converter 11 according to the test conditions, and can also control and monitor the pressure parameters of the regulated gas source 21.

[0057] The vision acquisition device 32 acquires data at the beginning of the injection stage, such as... Figure 5 The seepage diffusion path within rare earth ore layer 211 is shown. Simultaneously, during the leaching process, data is recorded in real-time under a complex magnetic field environment, such as... Figure 5 The liquid level of the leachate in the measuring cylinder 26 shown.

[0058] Application Example 1

[0059] This application example uses the magnetic field-enhanced leaching test apparatus for ion-type rare earth minerals provided in Example 1. The test method includes the following steps:

[0060] S1: Rare earth samples are retrieved on site and pre-treated. The pre-treatment includes rare earth ore sampling, sun drying, drying, sieving, and mixing. The samples are then reconstructed layer by layer in the leaching simulation box 24 and installed on the magnetic field support 14 of the system. A square liquid collector 25 and a liquid collection cylinder 26 are also placed in place.

[0061] S2: Prepare a leaching solution with a mass concentration of 2% and magnesium sulfate as the solute, and inject it into the stirring pressure storage tank 22. Turn on the stirrer to keep the leaching solution uniform and stable.

[0062] S3: Connect the pressure stabilizing air source 21 to the stirring pressure storage tank 22 and start it to make its internal air pressure reach the preset value of 0.2MPa;

[0063] S4: Start the pre-programmed programmable frequency converter 11 and generate a magnetic field. Use a magnetic field monitoring instrument to check the magnetic field strength in the magnetic field space.

[0064] S5: Position the visual acquisition device 32 directly opposite the immersion simulation chamber 24, ensure it is stable, and start the machine.

[0065] S6: Open the exhaust valve 29 and quickly inject the leaching solution. After the air in the upper part of the rare earth ore layer is basically exhausted, close the valve and start continuously injecting the leaching solution using controlled pressure injection. The injection rate of the leaching solution is 10~50 mL / min.

[0066] Test methods

[0067] Leaching experiments were conducted at magnetic field strengths of 0T, 1T, and 5T. The concentration of leached rare earth elements was calculated using the collected leachate. The test results are as follows: Figure 6 and Figure 7 As shown.

[0068] The seepage and diffusion path of the leachate was collected using a visual acquisition device under a magnetic field strength of 5T, and the evolution law of the wetting line was obtained as follows: Figure 8 As shown, the liquid level distribution of the leachate in the collecting cylinder is obtained as follows. Figure 9 As shown, where Figure 4 The measuring cylinders 26 for the central liquid are numbered 1 to 10 from left to right. The calculation of the seepage velocity is as follows: Figure 10 As shown.

[0069] The test results show that:

[0070] This invention simulates the actual leaching process to a high degree through the coordinated operation of a magnetic field generation module, a rare earth leaching module, and a control acquisition module. Furthermore, the magnetic field parameters are adjustable, enabling reliable investigation of the influence of different magnetic field conditions on the leaching effect of the magnetic field-enhanced leaching process of actual ion-adsorption rare earth ores. This provides technical support for the research on magnetic field-enhanced in-situ leaching technology of ion-adsorption rare earth ores and contributes to the development of green and efficient mining and beneficiation technologies for rare earth resources.

[0071] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A magnetic field-enhanced leaching test device for ion-type rare earth minerals, characterized in that, The magnetic field-enhanced leaching test device for ion-adsorption rare earth minerals includes a magnetic field generating module, a rare earth leaching module, and a control and acquisition module. The control and acquisition module is electrically connected to the magnetic field generating module and the rare earth leaching module. The rare earth leaching module includes a leaching simulation chamber, which is located inside the magnetic field generating module. The magnetic field generating module includes a Helmholtz coil, a programmable frequency converter, a shielding wire, and a magnetic field support. The programmable frequency converter is electrically connected to the Helmholtz coil through the shielding wire, and the Helmholtz coil is fixed on the magnetic field support. The rare earth leaching module also includes a pressure-stabilizing gas source, a stirring pressure storage tank, a liquid delivery pipeline, a square liquid collector, and a liquid collection cylinder. The pressure-stabilizing gas source is connected to the stirring pressure storage tank through a pipeline, and the stirring pressure storage tank is connected to the leaching simulation chamber through the liquid delivery pipeline. A rectangular perforated filter plate, a square liquid collector, and a liquid collection cylinder are arranged sequentially below the leaching simulation chamber. The number of square liquid collectors and liquid collection cylinders are the same, and they are evenly arranged below the rectangular perforated filter plate.

2. The magnetic field-enhanced leaching test device for ion-type rare earth minerals according to claim 1, characterized in that, A pressure gauge is installed at the gas outlet of the pressure-stabilized gas source.

3. The magnetic field-enhanced leaching test device for ion-type rare earth minerals according to claim 1, characterized in that, The stirring pressure storage tank is equipped with stirring blades.

4. The magnetic field-enhanced leaching test device for ion-type rare earth minerals according to claim 1, characterized in that, The leaching simulation chamber is equipped with a sealing cover, and the sealing cover is equipped with an exhaust valve.

5. The magnetic field-enhanced leaching test device for ion-type rare earth minerals according to claim 1, characterized in that, The control and acquisition module includes a control and acquisition system and a vision acquisition device. The control and acquisition system is electrically connected to the magnetic field generation module, the pressure gauge of the stabilizing gas source, and the vision acquisition device.

6. The magnetic field-enhanced leaching test device for ion-type rare earth minerals according to claim 5, characterized in that, The vision acquisition device collects the seepage diffusion path and the liquid level of the leachate in the rare earth leaching module.

7. A method for conducting tests using the magnetic field-enhanced leaching test apparatus for ion-type rare earth minerals as described in any one of claims 1-6, characterized in that, The method includes the following steps: S1: Rare earth samples were retrieved from the site and pretreated, and then reconstructed layer by layer in a leaching simulation chamber; S2: According to the leaching scheme, prepare the leaching solution and inject it into the rare earth leaching module, and turn on the stirring to keep the leaching solution uniform and stable. S3: To bring the internal air pressure of the rare earth leaching module to the preset value; S4: Activate the magnetic field generating module to produce a magnetic field; S5: Install smoothly and start the control acquisition module; S6: Quickly inject leaching solution to remove air. After the air in the upper part of the rare earth ore layer is completely removed, start continuously injecting leaching solution.

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