A high gradient magnetic separation device

Abstract

This utility model belongs to the field of wastewater treatment equipment, specifically relating to a high-gradient magnetic separation device, including a flocculation reaction tank, a magnetic field separation box, a sludge tank, and a clear water tank connected by pipes; the flocculation reaction tank is located above the magnetic field separation box, and the sludge tank and clear water tank are located below the magnetic field separation box; the magnetic field separation box is equipped with a stainless steel wool layer, and electromagnets are installed at the upper and lower ends of the magnetic field separation box, with rectifiers connected to the electromagnets; wastewater containing heavy metal ions is first mixed with the magnetic flocculation composite material in the flocculation reaction tank and stirred, and then flows into the magnetic field separation box under gravity. The rectifier applies a magnetic field to the upper and lower ends of the magnetic field separation box. Under the action of the magnetic field, the non-magnetic part is discharged into the clear water tank through the gaps in the stainless steel wool layer, while the magnetic part is captured in the stainless steel wool layer. After the magnetism is deactivated, the magnetic part enriched in the stainless steel wool layer flows into the sludge tank, thereby achieving the effect of sludge-water separation.

Description

Technical Field

[0001] This utility model belongs to the field of sewage treatment equipment, and more specifically, it relates to a high gradient magnetic separation device. Background Technology

[0002] One of the major environmental problems caused by abandoned mines is acidic mine runoff. This runoff typically has an extremely low pH, generally between 2 and 4, and contains various heavy metals harmful to the environment and human health, such as iron, manganese, zinc, copper, and lead. The levels of metal ions and other indicators in the water far exceed the Class IV water quality standards. If this untreated acidic runoff is directly discharged into natural water bodies, it will not only severely pollute surrounding water bodies and damage the local ecosystem, but may also pose a serious threat to the health of residents.

[0003] Currently, most methods for treating mine wastewater are physical and chemical, such as neutralization, precipitation, and adsorption. However, these methods often suffer from high costs, low efficiency, and secondary pollution. Therefore, developing a new, economical, and efficient technology for treating mine wastewater is urgently needed. Utility Model Content

[0004] To address the issues of poor treatment efficiency and high costs in existing mine wastewater treatment methods, this application proposes a high-gradient magnetic separation device based on the principle of treating acidic mine wastewater using magnetic flocculant composite materials. By discharging wastewater treated with magnetic flocculant composite materials into a magnetic field separation box and adjusting the magnetic field strength of the separation box, the device achieves the separation of clean water and sludge. This not only improves the efficiency of pollutant removal but also enables rapid separation using magnetic force, significantly reducing treatment costs.

[0005] Based on the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A high-gradient magnetic separation device includes a flocculation reaction tank, a magnetic field separation box, a sludge tank, and a clear water tank connected by pipes; the flocculation reaction tank is located above the magnetic field separation box, and the sludge tank and the clear water tank are located below the magnetic field separation box; the magnetic field separation box is equipped with a stainless steel bristle layer, and electromagnets are provided at the upper and lower ends of the magnetic field separation box, with rectifiers connected to the electromagnets.

[0007] The working principle of this device is as follows: wastewater containing heavy metal ions is first mixed with magnetic flocculation composite material in the flocculation reaction tank and stirred. Under the action of gravity, it flows into the magnetic field separation box. A magnetic field is applied to the upper and lower ends of the magnetic field separation box by a rectifier. Under the action of the magnetic field, the non-magnetic part (such as water) is discharged into the clear water tank through the gaps of the stainless steel layer, while the magnetic part (such as magnetic flocculant that enriches heavy metals) is captured in the stainless steel layer. After the magnetic field is demagnetized by the rectifier, the magnetic part enriched in the stainless steel layer flows into the sludge tank, thereby achieving the effect of sludge-water separation.

[0008] Furthermore, the filling height of the stainless steel frosting layer inside the magnetic field separation box is 30% to 80% of the height of the magnetic field separation box.

[0009] Furthermore, the filling height of the stainless steel frosting inside the magnetic field separation box is 50% of the height of the magnetic field separation box.

[0010] In practical use, the magnetic field separation box has a cylindrical structure, and the thickness of the stainless steel wool layer inside is within the above range, which helps to improve the contact efficiency between the magnetic flocculant and heavy metals in the wastewater, and at the same time facilitates the separation of mud and water.

[0011] Furthermore, the flocculation reaction tank and the magnetic field separation box are connected by a first drain pipe, with both ends of the first drain pipe connected to the bottom of the flocculation reaction tank and the bottom of the magnetic field separation box, respectively.

[0012] The flocculation reaction tank is located above the magnetic field separation box. The wastewater and magnetic flocculation composite material after the reaction in the flocculation reaction tank flow into the magnetic field separation box through the first drain pipe under the action of gravity.

[0013] Furthermore, the top and bottom of the magnetic field separation box are respectively connected to a second drain pipe and a sewage pipe; the outlet end of the second drain pipe is connected to the clear water tank; and the outlet end of the sewage pipe is connected to the sludge tank.

[0014] Furthermore, a high-pressure water pipe is also connected to the second drainage pipe.

[0015] A high-pressure water pipe is connected to the second drain pipe. After the magnetic field separation box is demagnetized, high-pressure water enters the magnetic field separation box through the high-pressure water pipe to wash off the magnetic solids attached to the stainless steel flocculant, thus achieving full recovery and reuse of the magnetic flocculant.

[0016] Furthermore, a first valve is installed on the first drain pipe; a second valve is installed on the sewage pipe; a third valve is installed on the second drain pipe; and a fourth valve is installed on the high-pressure water pipe.

[0017] Furthermore, the flocculation reaction tank is filled with magnetic flocculation composite material.

[0018] The magnetic flocculation composite material filled in the flocculation reaction tank can be recycled in the anhydrous treatment of heavy metals, reducing the waste of resources.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] This application employs a gradient configuration between the flocculation reaction tank and the magnetic field separation box. Wastewater in the flocculation reaction tank flows into the magnetic field separation box under gravity. A rectifier adjusts the magnetic field at both ends of the separation box. Under the influence of the magnetic field, the non-magnetic portion is discharged through the gaps in the stainless steel wool layer into the clear water tank, while the magnetic portion is captured within the stainless steel wool layer. After the rectifier demagnetizes the wastewater, the magnetic portion accumulated in the stainless steel wool layer flows into the sludge tank, thus achieving sludge-water separation. The process is simple, effective for heavy metal separation, and low-cost, making it a promising candidate for treating wastewater containing heavy metal ions. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the device in Example 1.

[0022] Attached figures and labels: 1. Flocculation reaction tank; 2. Magnetic field separation box; 3. Sludge tank; 4. Clear water tank; 5. Stainless steel lining; 6. Electromagnet; 7. First drain pipe; 8. First valve; 9. Sewage pipe; 10. Second valve; 11. Second drain pipe; 12. Third valve; 13. High-pressure water pipe; 14. Fourth valve. Detailed Implementation

[0023] To better illustrate the purpose, technical solution, and advantages of this application, the following detailed description will be provided in conjunction with specific embodiments. Those skilled in the art should understand that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. Example

[0024] This embodiment uses acidic wastewater from an abandoned mine in Yichang for treatment experiments. The high-gradient magnetic separation device used in this embodiment is as follows: Figure 1 As shown, the system includes a flocculation reaction tank 1, a magnetic field separation box 2, a sludge tank 3, and a clear water tank 4, all connected by pipes. The flocculation reaction tank 1 is located at the highest point. Magnetic flocculant composite material can be added directly to the tank before wastewater is introduced, or wastewater can be introduced first, followed by the addition of the magnetic flocculant composite material. The two materials are then stirred and reacted, allowing the magnetic flocculant to fully adsorb heavy metal ions in the wastewater. The magnetic flocculant composite material consists of magnetic seeds and flocculants. Magnetic seeds include magnetite, steel slag, fly ash, and activated carbon, while flocculants include aluminum sulfate, polyaluminum chloride, and polyacrylamide.

[0025] The magnetic field separation box 2 contains a stainless steel wool layer 5, and electromagnets 6 are located at both the top and bottom of the magnetic field separation box 2. The electromagnets 6 are connected to rectifiers. The filling height of the stainless steel wool layer 5 within the magnetic field separation box 2 is 30% to 80% of the height of the magnetic field separation box 2, preferably 50%. The magnetic field separation box 2 has an overall cylindrical structure, and the thickness of the stainless steel wool layer 5 within the above-mentioned range helps to improve the contact efficiency between the magnetic flocculant and heavy metals in the wastewater, while also facilitating sludge-water separation. The rectifier is used to control the intensity of the magnetic field applied to the magnetic field separation box 2, thereby facilitating the adsorption and separation of heavy metal ions in the wastewater.

[0026] The magnetic field separation box 2 is located below the flocculation reaction tank 1 and is connected to the flocculation reaction tank 1 through the first drain pipe 7, so that the sewage in the flocculation reaction tank 1 can flow into the magnetic field separation box 2 under the action of gravity. The first drain pipe 7 is equipped with a first valve 8, which is used to control the sewage to be discharged from the flocculation reaction tank 1 to the magnetic field separation box 2.

[0027] Below the magnetic field separation box 2 are a sludge tank 3 and a clear water tank 4, which are respectively connected to the clear water tank 4 and the sludge tank 3 through a second drain pipe 11 and a sewage pipe. The sewage pipe is equipped with a second valve 10, and the second drain pipe 11 is equipped with a third valve 12.

[0028] A high-pressure water pipe 13 is also connected to the second drain pipe 11, and a fourth valve 14 is installed on the high-pressure water pipe 13. By connecting the high-pressure water pipe 13 to the second drain pipe 11, after the magnetic field separation box 2 is demagnetized, the high-pressure water in the high-pressure water pipe 13 enters the magnetic field separation box 2, and washes off the magnetic solids attached to the stainless steel flocculant 5, so as to achieve full recovery and reuse of the magnetic flocculant.

[0029] The working principle of the device in this embodiment is as follows: Wastewater containing heavy metal ions is first mixed and stirred with the magnetic flocculation composite material in the flocculation reaction tank 1. Then, the first valve 8 is opened, and the wastewater flows into the magnetic field separation box 2 through the first drain pipe 7 under the action of gravity. A magnetic field is applied to the upper and lower ends of the magnetic field separation box 2 through the rectifier. Under the action of the magnetic field, the non-magnetic part (such as water) is discharged through the gaps of the stainless steel wool layer 5 and discharged to the clear water tank 4 through the second drain pipe 11. The magnetic part (such as magnetic flocculant enriched with heavy metals) is captured in the stainless steel wool layer 5. After the magnetic field is demagnetized by the rectifier, the magnetic part enriched in the stainless steel wool layer 5 flows into the sludge tank 3 through the sewage pipe 9, thereby achieving the effect of sludge-water separation. High-pressure water in the high-pressure water pipe 13 enters the magnetic field separation box 2 to wash off the magnetic solids attached to the stainless steel wool layer 5, thereby achieving full recovery and reuse of the magnetic flocculant.

[0030] This application is based on the principle of treating heavy metal ion wastewater using magnetic flocculation composite materials. Combined with the high-gradient magnetic separation device of this embodiment, a field treatment experiment was conducted on acidic mine wastewater in Yichang area, achieving the goal of efficiently removing heavy metals and other harmful substances. Furthermore, a comprehensive quality analysis of the treated wastewater ensures that it meets environmental standards, thereby mitigating the environmental harm caused by acidic wastewater.

Claims

1. A high-gradient magnetic separation device, characterized in that, It includes a flocculation reaction tank, a magnetic field separation box, a sludge tank, and a clear water tank connected by pipes; the flocculation reaction tank is located above the magnetic field separation box, and the sludge tank and clear water tank are located below the magnetic field separation box; the magnetic field separation box is equipped with a stainless steel bristle layer, and electromagnets are provided at the upper and lower ends of the magnetic field separation box, with rectifiers connected to the electromagnets.

2. The high gradient magnetic separation device according to claim 1, characterized in that, The filling height of the stainless steel wool layer in the magnetic field separation box is 30% to 80% of the height of the magnetic field separation box.

3. The high gradient magnetic separation device according to claim 1, characterized in that, The stainless steel wool layer fills 50% of the height of the magnetic field separation box.

4. The high-gradient magnetic separation device according to claim 1, characterized in that, The flocculation reaction tank and the magnetic field separation box are connected by a first drain pipe, with the two ends of the first drain pipe connected to the bottom of the flocculation reaction tank and the bottom of the magnetic field separation box, respectively.

5. The high gradient magnetic separation device according to claim 4, characterized in that, The top and bottom of the magnetic field separation box are respectively connected to a second drain pipe and a sewage pipe; the outlet end of the second drain pipe is connected to the clear water tank; and the outlet end of the sewage pipe is connected to the sludge tank.

6. The high-gradient magnetic separation device according to claim 5, characterized in that, A high-pressure water pipe is also connected to the second drain pipe.

7. The high gradient magnetic separation device according to claim 6, characterized in that, The first drain pipe is equipped with a first valve; the sewage pipe is equipped with a second valve; the second drain pipe is equipped with a third valve; and the high-pressure water pipe is equipped with a fourth valve.

8. The high-gradient magnetic separation device according to claim 1, characterized in that, The flocculation reaction tank is filled with magnetic flocculation composite material.

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