Method for intensifying ion adsorption type rare earth ore in-situ leaching based on chaotic circuit

Abstract

The invention provides a method for intensifying ion adsorption type rare earth ore in-situ leaching based on a chaotic circuit. According to the method, the in-situ leaching efficiency of ion adsorption type rare earth is improved by taking an adjustable chaotic voltage signal as an electric mining electric signal. Specifically, chaotic voltage is connected to a graphite pole rod to form a chaotic circuit path of a lower cathode and an upper anode; and carrying out in-situ leaching on the leachate, and collecting enriched liquid. The chaotic circuit is a nonlinear voltage sequence, and a direct current signal is changed into a chaotic signal through an analog multiplier and an operational amplifier.

Description

Technical Field

[0001] This invention relates to the fields of rare earth mineral mining and beneficiation and electric field-enhanced metallurgy, specifically to an in-situ leaching equipment and technology for rare earth minerals based on green electricity-driven chaotic circuit-enhanced ion adsorption. Background Technology

[0002] Rare earth products are used in high-tech fields that are a vital pillar of China's current economic development, creating enormous economic value and employment opportunities for the country. Faced with increasing international demand for strategic medium and heavy rare earth resources, how to both increase the leaching rate of medium and heavy rare earths in rare earth mines and minimize environmental impact has become a key research focus that urgently needs to be addressed.

[0003] Current photovoltaic energy storage technologies suffer from high costs for long-term storage and poor grid connection stability. Appropriate measures must be taken to ensure a balance between renewable and traditional energy sources. Researchers have designed an electric rare earth mining technology using solar energy. By applying direct current (DC) to leach rare earths, results show that DC power can accelerate the directional migration of ions, reduce leaching agent consumption by 80%, and efficiently and sustainably recover rare earth elements while reducing metal impurities by 70%. However, electric mining requires significant electrical energy to handle the large volume of ion-adsorption rare earth ores in situ and the high resistivity of the soil itself.

[0004] A chaotic circuit is a nonlinear current and voltage circuit, similar to a pulse current. However, unlike a pulse current which continuously switches between on and off, a chaotic circuit is a current signal that changes continuously. It is often used in the field of metal electrolysis in industry to achieve energy saving and improve manganese deposition.

[0005] To address this issue, a mixed magnesium ammonium sulfate synergistic leaching method is employed for ion-adsorption rare earth ores. An adjustable chaotic circuit is used to modify the DC current and intermittent current of the electro-mining technology into a chaotic voltage signal with a nonlinear component. Leveraging the instantaneous high driving force of this nonlinear component, the leaching solution system is shifted from being dominated by electrolysis to one that accelerates electromigration, activates rare earth ions adsorbed on the clay, reduces rare earth ion precipitation caused by concentration polarization around the electrodes, and minimizes the leaching rate reduction due to bubbles generated by hydrogen and oxygen evolution reactions. This reduces power consumption and leaching time, thereby increasing the leaching rate of ion-adsorption rare earths. The goal is to achieve the maximum leaching rate of medium and heavy rare earths using the lowest salt content leaching agent and with extremely low power consumption, thus establishing a green technology system for rare earth leaching. This approach is expected to provide theoretical support for the development of efficient and stable leaching processes and equipment for ion-adsorption rare earths. Summary of the Invention

[0006] The purpose of this invention is to provide a method for in-situ leaching of rare earth minerals based on chaotic circuit-enhanced ion adsorption, characterized in that:

[0007] The device used includes a reactor (1), an upper electrode (3), an upper filter layer (4), a lower filter layer (6), a lower electrode (7), and a collector (8); the reactor (1) is cylindrical, and its lower end is connected to a funnel-shaped collector (8). The upper electrode (3), the upper filter layer (4), the lower filter layer (6), and the lower electrode (7) are located inside the reactor (1).

[0008] The leaching method includes the following steps:

[0009] 1) Install the lower filter layer (6) and the lower electrode (7) at the bottom of the reactor (1);

[0010] 2) Load the rare earth ore (5) into the reactor (1), and install a filter layer (4) and an upper electrode (3) on top of the rare earth ore (5);

[0011] 3) A mixed solution of magnesium sulfate and ammonium sulfate was used as the leachate and passed into reactor (1);

[0012] 4) Connect the upper electrode (3) and the lower electrode (7) to the chaotic circuit via wires;

[0013] 5) After leaching is completed, rare earth ore leachate is obtained from the funnel outlet at the bottom of the collector (8).

[0014] Furthermore, the upper electrode (3) and the lower electrode (7) are graphite electrode rods.

[0015] Furthermore, the rare earth ore (5) in step 2) is an ion-adsorption type rare earth ore; before leaching, the rare earth ore (5) is dried and sieved, and the sieve is a 20-mesh sieve.

[0016] Furthermore, the ammonium sulfate content and magnesium sulfate content in the leachate of step 1) are 14.95–15.05 g / L and 14.95–15.05 g / L, respectively.

[0017] Furthermore, in step 4), the chaotic circuit has a voltage fluctuation range of 0.2 to 7.5V, a current rise range of 0 to 22.0mA, and a power fluctuation range of 84.2 to 86.6W.

[0018] Furthermore, methods such as Figure 5 The chaotic circuit shown has the following components:

[0019]

[0020] Furthermore, the chaotic circuit is controlled by an analog multiplier and an operational amplifier according to the continuously changing voltage signal of the chaotic attractor, and the chaotic attractor of the chaotic circuit is monitored in real time by an oscilloscope.

[0021] Furthermore, the leaching time in step 5) is 6 hours.

[0022] The technical effects of this invention are undeniable; chaotic circuits can enhance the leaching of ion-adsorption rare earth minerals. The beneficial effects of this invention are:

[0023] (1) It improves the leaching rate of rare earth ions and reduces the use of salt ion leaching agents;

[0024] (2) Reduce power consumption;

[0025] (3) Reduce leaching time. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the device of the present invention;

[0027] Figure 2 This is a schematic diagram of the experiment in Example 1;

[0028] Figure 3 It is a comparison chart of power consumption, leaching rate and leaching time for different circuits;

[0029] Figure 4 It refers to the range of current fluctuations in chaotic circuits and DC circuits.

[0030] Figure 5 This is a chaotic circuit diagram;

[0031] In the figure: reactor (1), leachate (2), upper electrode (3), upper filter layer (4), rare earth ore (5), lower filter layer (6), lower electrode (7), collector (8). Detailed Implementation

[0032] The present invention will be further described below with reference to embodiments, but it should not be construed that the scope of the present invention is limited to the following embodiments. Various substitutions and modifications made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention should be included within the scope of protection of the present invention.

[0033] Example 1:

[0034] The apparatus used in this embodiment includes a reactor (1), an upper electrode (3), an upper filter layer (4), a lower filter layer (6), a lower electrode (7), and a collector (8); Figure 2 As shown, in the experiment, an organic glass cylinder was used to simulate the reactor (1), with holes on its side to allow wires to pass through, and its lower end was connected to a funnel-shaped collector (8) as a collection device.

[0035] The leaching method includes the following steps:

[0036] 1) Filter paper and graphite rods are loaded at the bottom of the simulated reactor (1) to simulate the lower filter layer (6) and the lower electrode (7).

[0037] 2) The rare earth ore (5) is loaded into the reactor (1). The ion adsorption type rare earth ore is dried and sieved before leaching. The sieve is a 20-mesh sieve.

[0038] Graphite rods and filter paper are placed on top of rare earth ore (5) to simulate the upper filter layer (4) and upper electrode (3);

[0039] 3) A mixed solution of magnesium sulfate and ammonium sulfate is used as a leachate and passed into reactor (1); in the example, the content of ammonium sulfate and magnesium sulfate in the leachate is 15.0 g / L;

[0040] 4) Connect the upper electrode (3) and the lower electrode (7) to the chaotic circuit through wires; the voltage fluctuation range of the chaotic circuit is 0.2 to 7.5V, the current rise range is 0 to 22.0mA, and the power fluctuation range is 84.2 to 86.6W.

[0041] 5) After leaching for 6 hours, the rare earth ore leachate was obtained from the funnel outlet at the bottom of the collector (8). Comparative Example 1:

[0042] In Comparative Example 1, the apparatus and steps used are the same as in Example 1. The difference is that in step 4), a DC power supply is used in the circuit. The voltage fluctuation range of the DC circuit is 3.9 to 4.1V, the current rise range is 0 to 28mA, and the power fluctuation range is 103.2 to 106.5W.

[0043] Comparative Example 2:

[0044] In Comparative Example 2, the apparatus and steps used are the same as in Example 1, except that the electrodes are not connected to the circuit.

[0045] Experimental results:

[0046] like Figure 3 As shown: When the leaching rate of ionic rare earth elements using the chaotic voltage group (Example 1) reached 94.12% after 2.0 hours, compared to the 88.79% leaching rate obtained using a DC circuit (Comparison 1), this method improved the rare earth leaching rate by 5.33%, reduced power consumption by 36.75%, and reduced the average voltage by 0.41V; compared to the 86.34% leaching rate obtained using in-situ leaching without power (Comparison 2), the leaching rate of the chaotic voltage group improved by 7.78%. Both the DC voltage group and the in-situ leaching group without power require 2.5 hours to reach a leaching rate of over 95%, therefore the leaching rate of the chaotic voltage group is increased by 20%. (Note:) Figure 3 In the text, "In-situ" refers to in-situ leaching without electricity, "DC" refers to direct current voltage leaching, and "Chaos" refers to chaotic voltage leaching.

Claims

1. A method for enhancing in-situ leaching of ion-adsorption type rare earth ore based on chaotic circuit, characterized in that: the device used comprises a reactor (1), an upper electrode (3), an upper filter layer (4), a lower electrode (7), a lower filter layer (6) and a collector (8); the reactor (1) is cylindrical, and its lower end is connected to a funnel-shaped collector (8); the upper electrode (3), the upper filter layer (4), the lower filter layer (6) and the lower electrode (7) are located in the inner cavity of the reactor (1); the leaching method comprises the following steps: 1) installing the lower filter layer (6) and the lower electrode (7) at the bottom of the reactor (1); 2) loading the rare earth ore (5) into the reactor (1), and installing the upper filter layer (4) and the upper electrode (3) on the top of the rare earth ore (5); 3) introducing a mixed solution of magnesium sulfate and ammonium sulfate as leaching liquid into the reactor (1); 4) connecting the upper electrode (3) and the lower electrode (7) to a chaotic circuit through wires; and 5) obtaining the rare earth ore leaching liquid from the funnel outlet at the bottom of the collector (8) after the leaching of the ore is completed. The upper electrode (3) and the lower electrode (7) are graphite electrode rods. The rare earth ore (5) in step 2) is ion-adsorption type rare earth ore; before leaching, the rare earth ore (5) is subjected to drying and sieving treatment, and the sieving is 20-mesh sieving. The content of ammonium sulfate and the content of magnesium sulfate in the leaching liquid in step 1) are 14.95-15.05 g / L and 14.95-15.05 g / L, respectively. The voltage fluctuation range of the chaotic circuit in step 4) is 0.2-7.5 V, the current rise range is 0-22.0 mA, and the power fluctuation range is 84.2-86.6 W. The leaching time in step 5) is 6 h. ​ ​ 2. The method according to claim 1, wherein the method is characterized by: ​ 3. The method according to claim 1, wherein the method is characterized by: ​ 4. The method according to claim 1, wherein the method is characterized by: ​ 5. The method according to claim 1, wherein the method is characterized by: ​ 6. The method according to claim 1, wherein the method is characterized by: ​

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