A pipe type leaching device based on magnetic field strengthening and microbial leaching

Abstract

The utility model relates to the technical fields of metallurgy discloses a kind of pipe type leaching device based on magnetic field intensification and microbial leaching, including the leaching liquid preparation unit and the magnetic field intensification pipe type leaching reaction unit connected in sequence, and leaching liquid preparation unit includes bioreactor, flat plate membrane assembly, pump system, first online detection system, stirring motor, stirring paddle, air compressor and aeration ring;The magnetic field intensification pipe type leaching reaction unit includes pelletizer, vertically arranged pipe reactor main body, magnetic field generating device, second online detection assembly, leaching liquid collection tank, mineral powder particle collection tank, crusher and magnetic force sorting equipment.The application makes non-magnetic city ore powder be wrapped on magnetite core by granulation, gives it magnetism, by magnetic field controller dynamic adjustment solenoid, so that magnetic particle forms controlled motion in pipe reactor, completely eliminates settlement dead zone, greatly improves solid-liquid mass transfer efficiency and valuable metal leaching rate.

Description

Technical Field

[0001] This utility model relates to the technical field of metallurgy, and more specifically, to a tubular leaching device based on magnetic field enhancement and microbial leaching. Background Technology

[0002] Waste printed circuit boards, spent catalysts, and smelting slag contain large amounts of valuable metals. Traditional chemical leaching methods are characterized by high acid consumption and significant pollution; bioleaching utilizes acidophilic microorganisms to produce acid, which is environmentally friendly, but suffers from slow reaction rates and low solid-liquid mass transfer efficiency. In tubular reactors, solid particles tend to settle and accumulate under gravity, forming dead zones that severely impact leaching efficiency and metal recovery rates. Furthermore, online separation of microorganisms from the leachate, magnetic control of non-magnetic materials, and resource recycling of leaching residue are also challenges for industrial application. Therefore, there is an urgent need for a leaching device that can enhance mass transfer, flexibly control particle movement, and achieve internal circulation. Utility Model Content

[0003] In view of the above-mentioned technical problems in related technologies, this utility model provides a tubular leaching device based on magnetic field enhancement and microbial leaching, which can solve the above problems.

[0004] To achieve the above-mentioned technical objectives, the technical solution of this utility model is implemented as follows: A tubular leaching device based on magnetic field enhancement and microbial leaching includes a leachate preparation unit and a magnetic field-enhanced tubular leaching reaction unit connected in sequence. The leachate preparation unit includes a bioreactor, with a stirring paddle and an aeration ring in the reaction zone of the bioreactor. A flat sheet membrane module is located at the upper end of the reaction zone, and the permeate side of the membrane module is connected to the inlet of a pump system. The leachate preparation unit also includes a first online detection system, which at least includes a pH electrode, and its detection end is located in the reaction zone. The magnetic field-enhanced tubular leaching reaction unit includes a vertically arranged tubular reactor body, with several reaction tubes vertically arranged inside. A leachate inlet and a particle inlet are located at the top of the reactor body. The leachate inlet is connected to the output end of the pump system, and the particle inlet is connected to the output end of a granulator. The bottom of the tubular reactor body is equipped with a two-way valve for connecting the leachate outlet and the particle outlet. The leachate outlet is connected to the leachate collection tank, and the particle outlet is connected to the mineral powder particle collection tank. Several coil fixing frames are evenly arranged around the periphery of the tubular reactor body. Electromagnetic coils are installed on the coil fixing frames and are electrically connected to a magnetic field controller. The magnetic field enhanced tubular leaching reaction unit also includes a second online detection component. The detection end of the second online detection component is located in the reaction tube. The discharge port of the mineral powder particle collection tank is connected to the feed port of the crusher. The discharge port of the crusher is connected to a magnetic separation device. The magnetite outlet of the magnetic separation device is connected to the magnetite feed port of the granulator. The pump system, the first online detection system, the granulator, the second online detection component, the magnetic field controller, the crusher, and the magnetic separation device are all electrically connected to a main controller.

[0005] Furthermore, the stirring paddle is located in the middle of the reaction zone of the chamber, the driving end of the stirring paddle is connected to a stirring motor, the aeration ring is located at the bottom of the reaction zone of the chamber, the aeration ring is connected to an air compressor through a pipe, and both the stirring motor and the air compressor are electrically connected to the main controller.

[0006] Furthermore, the flat sheet membrane module is a microfiltration membrane or an ultrafiltration membrane module.

[0007] Furthermore, the first online detection system also includes a redox potential electrode and a dissolved oxygen electrode.

[0008] Furthermore, the granulator is used to mix and granulate urban mineral powder with magnetite powder to form magnetic particles.

[0009] Furthermore, the second online detection component includes a pH meter, a redox potential electrode, an electrochemical metal ion detection electrode, a temperature electrode, and a flow rate detection sensor.

[0010] Furthermore, the crusher is a ball mill.

[0011] Furthermore, a water bath system is provided on the outside of the tubular reactor body, the water bath system including a cooling water inlet and a cooling water outlet.

[0012] The beneficial effects of this utility model are as follows: This application uses granulation to coat non-magnetic urban ore powder onto a magnetite core, giving it magnetism. By dynamically adjusting the electromagnetic coil through a magnetic field controller, the magnetic particles form a controlled movement within the tubular reactor, completely eliminating the sedimentation dead zone and significantly improving the solid-liquid mass transfer efficiency and the leaching rate of valuable metals. At the same time, it integrates a crushing and magnetic separation system to dissociate and recover the magnetite in the leached ore powder and return it to the granulation system for recycling, reducing the need for magnetite replenishment. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a tubular leaching device based on magnetic field enhancement and microbial leaching, as described in an embodiment of this utility model. Figure 2 This is a schematic diagram of the structure of the leachate preparation unit according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the magnetic field-enhanced tubular leaching reaction unit described in this embodiment of the present invention.

[0015] In the picture: 100. Leachate preparation unit; 101. Bioreactor; 102. Flat sheet membrane module; 103. Pump system; 104. First online detection system; 105. Stirring motor; 106. Stirring paddle; 107. Air compressor; 108. Aeration ring; 200. Magnetic field enhanced tubular leaching reaction unit; 201. Granulator; 202. Tubular reactor body; 203. Electromagnetic coil; 204. Coil holder; 205. Magnetic field controller; 206. Second online detection component; 207. Leachate collection tank; 208. Mineral powder particle collection tank; 209. Crusher; 210. Magnetic separation equipment; 211. Cooling water inlet; 212. Cooling water outlet; 213. Water bath system; 214. Small magnetic coil. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0017] like Figures 1-3 As shown, this utility model discloses a tubular leaching device based on magnetic field enhancement and microbial leaching, which is composed of a leaching solution preparation unit 100 and a magnetic field enhanced tubular leaching reaction unit 200 connected together.

[0018] In one specific embodiment of this application, the leachate preparation unit 100 includes a bioreactor 101, a flat-sheet membrane module 102, a pump system 103, a first online detection system 104, a stirring motor 105, a stirring paddle 106, an air compressor 107, and an aeration ring 108. Acidophilic microorganisms and energy substances (such as sulfur powder, pyrite, etc.) are added to the bioreactor 101. The stirring motor 105 is turned on, driving the stirring paddle 106. The air compressor 107 introduces air and carbon dioxide into the reaction solution through the aeration ring 108, providing oxygen and a carbon source for microbial growth. The pH electrode, redox potential electrode, and dissolved oxygen electrode of the first online detection system 104 monitor the state of the reaction solution in real time. When the pH value drops to a set value, it indicates that the microorganisms have metabolized and produced sufficient acidic leachate. At this time, the pump system 103 is activated, and the reaction solution is filtered through the flat-sheet membrane module 102. Microorganisms and unreacted energy substances are retained, and the clear acidic leachate is extracted and sent to the magnetic field-enhanced tubular leaching reaction unit 200.

[0019] In one specific embodiment of this application, the granulator 201 of the magnetic field-enhanced tubular leaching reaction unit 200 mixes urban mineral powder (such as waste circuit board powder) with magnetite powder in a certain proportion, and then forms spherical particles with magnetite as the core and urban mineral powder as the outer coating through disc granulation or extrusion granulation. Multiple reaction tubes are connected in series or parallel within the tubular reactor body 202 according to the processing capacity. The particles enter through the particle inlet at the top of the tubular reactor body 202, while the leachate enters from the leachate inlet and flows downwards along the vertical pipe under the action of gravity.

[0020] In one specific embodiment of this application, multiple sets of electromagnetic coils 203 are uniformly arranged outside the tubular reactor body 202 and positioned by coil fixing brackets 204. The main controller receives and analyzes the real-time signals from the second online detection component 206 (including a pH meter, redox potential electrode, electrochemical metal ion detection electrode, temperature electrode, and flow rate detection device), and sends corresponding control signals to the magnetic field controller 205, thereby adjusting the magnitude and direction of the current in each set of electromagnetic coils 203 to form an alternating magnetic field inside the tube. Under the action of the magnetic field force, the magnetic mineral powder particles generate complex motion trajectories, constantly changing their relative positions with the leachate, completely avoiding particle accumulation and achieving full contact across the entire cross-section. The water bath system 213 circulates constant-temperature water to control the reaction temperature; simultaneously, during the reaction, fresh acidic leachate can be drawn from the outlet of the pump system 103 and replenished to the inlet at the top of the tubular reactor body 202, replenishing as needed to maintain a suitable pH value inside the tubular reactor. The reaction process is monitored by the second online detection component 206, and the reaction endpoint is determined when the metal ion concentration no longer increases and the pH tends to stabilize. At this time, the magnetic field controller 205 keeps the electromagnetic coil 203 energized to maintain the suspension of the mineral powder particles, and simultaneously activates the small magnetic coil 214 at the leachate outlet (or installs a filter or sieve plate at the leachate outlet) to prevent particles from flowing out; the leachate flows into the leachate collection tank 207 from the bottom outlet under the action of gravity. After the leachate is completely drained, the magnetic field controller 205 cuts off the current to all electromagnetic coils 203, and the mineral powder particles fall into the mineral powder collection tank 208 under the action of gravity.

[0021] In one specific embodiment of this application, the leached mineral powder particles are fed into a crusher 209 (such as a ball mill) for pulverization, causing the remaining particles to dissociate. The powder is then separated from the magnetite by a magnetic separator 210 and sent back to the granulator 201 for recycling. The non-magnetic tailings can be further processed into other valuable products.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tubular leaching device based on magnetic field enhancement and microbial leaching, characterized in that, The system includes a leachate preparation unit (100) and a magnetic field-enhanced tubular leaching reaction unit (200) connected in sequence. The leachate preparation unit (100) includes a bioreactor (101), the reaction zone of which is equipped with a stirring paddle (106) and an aeration ring (108). A flat sheet membrane module (102) is installed at the upper end of the reaction zone. The permeate side of the flat sheet membrane module (102) is connected to the inlet of a pump system (103). The leachate preparation unit (100) also includes a first online detection system (104). It includes at least a pH electrode, and the detection end of the first online detection system (104) is located in the reaction zone of the chamber; the magnetic field enhanced tubular leaching reaction unit (200) includes a vertically arranged tubular reactor body (202), and several reaction tubes are vertically arranged inside the tubular reactor body (202). The top of the tubular reactor body (202) is provided with a leachate inlet and a particle inlet. The leachate inlet is connected to the output end of the pump system (103), and the particle inlet is connected to the output end of the granulator (201). The bottom of the tubular reactor body (202) is provided with a connection for the leachate inlet. A dual-way valve is provided for the leaching liquid outlet and the particle outlet. The leaching liquid outlet is connected to the leaching liquid collection tank (207), and the particle outlet is connected to the mineral powder particle collection tank (208). Several coil fixing frames (204) are evenly arranged around the periphery of the tubular reactor body (202). Electromagnetic coils (203) are provided on the coil fixing frames (204). The electromagnetic coils (203) are electrically connected to the magnetic field controller (205). The magnetic field enhanced tubular leaching reaction unit (200) also includes a second online detection component (206). The detection end of the second online detection component (206) is located in the reaction tube. In this system, the discharge port of the mineral powder particle collection tank (208) is connected to the feed port of the crusher (209), the discharge port of the crusher (209) is connected to the magnetic separation device (210), and the magnetite outlet of the magnetic separation device (210) is connected to the magnetite feed port of the granulator (201). The pump system (103), the first online detection system (104), the granulator (201), the second online detection component (206), the magnetic field controller (205), the crusher (209), and the magnetic separation device (210) are all electrically connected to the main controller.

2. The tubular leaching device based on magnetic field enhancement and microbial leaching according to claim 1, characterized in that, The stirring paddle (106) is located in the middle of the reaction zone of the chamber. The driving end of the stirring paddle (106) is connected to the stirring motor (105). The aeration ring (108) is located at the bottom of the reaction zone of the chamber. The aeration ring (108) is connected to the air compressor (107) through a pipe. The stirring motor (105) and the air compressor (107) are both electrically connected to the main controller.

3. The tubular leaching device based on magnetic field enhancement and microbial leaching according to claim 1, characterized in that, The flat sheet membrane module (102) is a microfiltration membrane or an ultrafiltration membrane module.

4. The tubular leaching device based on magnetic field enhancement and microbial leaching according to claim 1, characterized in that, The first online detection system (104) also includes a redox potential electrode and a dissolved oxygen electrode.

5. A tubular leaching device based on magnetic field enhancement and microbial leaching according to claim 1, characterized in that, The granulator (201) is used to mix urban mineral powder and magnetite powder to form magnetic particles.

6. The tubular leaching device based on magnetic field enhancement and microbial leaching according to claim 1, characterized in that, The second online detection component (206) includes a pH meter, a redox potential electrode, an electrochemical metal ion detection electrode, a temperature electrode, and a flow rate detection sensor.

7. A tubular leaching device based on magnetic field enhancement and microbial leaching according to claim 1, characterized in that, The crusher (209) is a ball mill.

8. A tubular leaching device based on magnetic field enhancement and microbial leaching according to claim 1, characterized in that, The tubular reactor body (202) is also provided with a water bath system (213) on the outside, which includes a cooling water inlet (211) and a cooling water outlet (212).

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