A mine wastewater chemical purification treatment system

Abstract

The application relates to the technical field of mine wastewater treatment, and discloses a mine wastewater chemical purification treatment system, which comprises a reactor, a magnetic flocculation sedimentation tank and a circular sedimentation tank; a stirring mechanism one is arranged in the reactor and used for feeding reaction reagents; a coagulation tank, a magnetic mixing tank and a coagulation aid tank are sequentially arranged in the magnetic flocculation sedimentation tank; the coagulation tank, the magnetic mixing tank and the coagulation aid tank are separated by two partition plates; the two partition plates are arranged in a low-high mode; and stirring mechanisms two are arranged in the coagulation tank, the magnetic mixing tank and the coagulation aid tank. According to the combined process of "pretreatment + magnetic flocculation sedimentation + deep purification", the mine wastewater can be treated to remove various pollutants such as suspended solids, sulfur, fluorine, arsenic, heavy metals, COD, ammonia nitrogen, total nitrogen, total phosphorus, petroleum, total salt, sulfate and the like.

Description

Technical Field

[0001] This application relates to the field of mine wastewater treatment technology, and in particular to a chemical purification system for mine wastewater. Background Technology

[0002] Mine wastewater mainly originates from mining water in coal mines, gold mines, and other underground mining operations. It contains various pollutants such as suspended solids, sulfur, fluoride, arsenic, heavy metals, COD, ammonia nitrogen, total nitrogen, total phosphorus, petroleum, and total salts and sulfates. Currently, mine wastewater treatment can be categorized into treated reuse or discharge, with different destinations requiring different water quality standards.

[0003] The mainstream process for treating high-salinity mine wastewater is pretreatment for turbidity / hardness removal + reverse osmosis membrane desalination + evaporation crystallization. This process has a high cost per ton of water and requires a large investment, which is not conducive to large-scale promotion and application. Therefore, a chemical purification system for mine wastewater is proposed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a chemical purification system for mine wastewater to solve the problems mentioned in the background art.

[0005] The chemical purification and treatment system for mine wastewater provided in this application adopts the following technical solution:

[0006] A chemical purification system for mine wastewater includes a reactor, a magnetic flocculation sedimentation tank, and a circular sedimentation tank. The reactor is equipped with a stirring mechanism for introducing reaction reagents. The magnetic flocculation sedimentation tank contains a coagulation tank, a magnetic mixing tank, and a coagulation aid tank arranged sequentially. These tanks are separated by two partition plates, one lower and one higher. Each tank is equipped with a stirring mechanism. The circular sedimentation tank is fixedly connected to the magnetic flocculation sedimentation tank on the side closest to the coagulation aid tank, and the circular sedimentation tank communicates with the inner cavity of the coagulation aid tank. The circular sedimentation tank is equipped with a sludge scraping mechanism.

[0007] Preferably, a magnetic mud pump is installed on the outer wall of the circular sedimentation tank, and a magnetic mud separator is installed on the outer wall of the magnetic flocculation sedimentation tank. The suction end of the magnetic mud pump is connected to the bottom inner cavity of the circular sedimentation tank, and its output end is connected to the magnetic mud separator. The magnetic mixing tank is connected to the magnetic mud separator.

[0008] Preferably, the stirring mechanism includes a support, a motor, a rotating shaft, and a stirring paddle. The support is fixedly connected to the top of the reactor, the rotating shaft is rotatably connected to the outer wall of the middle section of the support, the stirring paddle is fixedly connected to the bottom end of the rotating shaft, and the motor is fixedly installed on the top outer wall of the support, with its output shaft fixedly connected to the top end of the rotating shaft.

[0009] Preferably, a pump is fixedly installed on the outer wall of the magnetic flocculation sedimentation tank. The suction end of the pump is connected to the inner cavity of the reactor, and its output end is connected to the coagulation tank.

[0010] Preferably, the stirring mechanism 2 includes a support 2, a motor 2, a rotating shaft 2 and a stirring paddle 2. The support 2 is fixedly connected to the top outer wall of the magnetic flocculation sedimentation tank. Multiple rotating shafts 2 are rotatably connected to the inner wall of the support 2. The stirring paddle 2 is fixedly connected to the bottom outer wall of the rotating shaft 2. Multiple motors 2 are fixedly installed on the top outer wall of the support 2, and the end of their output shafts is fixedly connected to the top of the rotating shaft 2.

[0011] Preferably, the sludge scraping mechanism includes a support frame three, a motor three, a rotating shaft three, and a scraper plate. The support frame three is fixedly connected to the top outer wall of the circular sedimentation tank. The rotating shaft three is rotatably connected to the outer wall of the support frame three. The scraper plate is fixedly connected to the bottom end of the rotating shaft three and fits against the bottom inner wall of the circular sedimentation tank. The motor three is fixedly installed on the top outer wall of the support frame three, and the end of its output shaft is fixedly connected to the top end of the rotating shaft three.

[0012] Preferably, the outer wall of the circular sedimentation tank is provided with a water outlet.

[0013] In summary, this application includes the following beneficial technical effects:

[0014] 1. This system, through a combination of "pretreatment + magnetic flocculation sedimentation + deep purification" processes, can specifically remove various pollutants from mine wastewater, including suspended solids, sulfur, fluoride, arsenic, heavy metals, COD, ammonia nitrogen, total nitrogen, total phosphorus, petroleum, as well as total salt and sulfate. Among these, the fluoride content can be reduced to below 1.0 mg / L, the suspended solids content can be controlled within 10 mg / L, the hardness can be ≤50 mg / L, the sulfate content can be ≤100 mg / L, and the total salt (TDS) can be ≤1600 mg / L. This meets the water quality requirements for reuse (such as mining production water, fire fighting water, etc.) and also complies with the Class III / IV surface water and the limits for total salt and sulfate in various watersheds when discharged, realizing diversified treatment destinations for wastewater.

[0015] 2. Compared to the traditional "pretreatment for turbidity / hardness removal + reverse osmosis membrane desalination + evaporation crystallization" process, this system adopts a combination of chemical methods and magnetic flocculation technology. It does not rely on high-cost reverse osmosis membrane modules and evaporation crystallization equipment, and the investment cost is only 1 / 8 of the traditional process. At the same time, through the design of magnetic powder recycling (recycled in the magnetic mixing tank after separation by the magnetic mud separator) and efficient reagent reaction (such as the reversible anion exchange of LDH layered bimetallic hydroxide), the consumption of consumables is reduced, and the operating cost is only 1 / 5 of the traditional process, which significantly improves the economics of the process and its value for large-scale promotion.

[0016] 3. The system employs a staged reaction design (with coagulation tank, magnetic mixing tank, and coagulation aid tank acting sequentially), combined with enhanced mixing by a stirring mechanism (mechanical stirring by impeller one and impeller two), ensuring thorough reaction between the reagents and pollutants. The resulting magnetic composite flocs settle rapidly, achieving a separation efficiency in the circular sedimentation tank that is more than 30% higher than that of traditional sedimentation tanks. Furthermore, the staggered partition design allows wastewater to flow by gravity, reducing the energy consumption of power equipment. The sludge scraping mechanism promptly removes settled sludge, preventing tank blockage and ensuring long-term stable operation of the system.

[0017] 4. This system is not only suitable for treating wastewater from various mines such as coal mines and gold mines, but also meets the purification needs of industrial wastewater from metallurgy, coal gasification, and photovoltaic panel manufacturing. It can flexibly adjust the type of reagent according to different water quality characteristics (such as adding calcium salt for high-fluoride wastewater and adding LDH reagent for high-salt wastewater). At the same time, LDH precipitates contained in sludge can be further recycled and reused. The recycling of magnetic powder reduces solid waste emissions, which is in line with the environmental protection concept of "pollution reduction and carbon reduction" and achieves synergistic effect between pollutant treatment and resource recycling. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of an embodiment of the application;

[0019] Figure 2 This is a bottom-view perspective view of an embodiment of the application;

[0020] Figure 3 This is an internal cross-sectional view of an embodiment of the application.

[0021] Explanation of reference numerals in the attached diagram: 1. Reactor; 2. Magnetic flocculation sedimentation tank; 3. Coagulation tank; 4. Magnetic mixing tank; 5. Coagulation aid tank; 6. Circular sedimentation tank; 7. Support 1; 8. Motor 1; 9. Rotating shaft 1; 10. Agitator 1; 11. Pump; 12. Support 2; 13. Motor 2; 14. Rotating shaft 2; 15. Agitator 2; 16. Baffle plate; 17. Support 3; 18. Motor 3; 19. Rotating shaft 3; 20. Sludge scraper; 21. Magnetic mud pump; 22. Magnetic mud separator; 23. Outlet. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0023] This application discloses a chemical purification and treatment system for mine wastewater. (Refer to...) Figure 1-3A chemical purification system for mine wastewater is disclosed. The system includes a reactor 1, a magnetic flocculation sedimentation tank 2, and a circular sedimentation tank 6. The reactor 1 serves as the initial reaction site for wastewater treatment. An internal stirring mechanism ensures thorough mixing of the introduced reaction reagents with the mine wastewater, laying the foundation for subsequent treatment. The magnetic flocculation sedimentation tank 2 is divided into a coagulation tank 3, a magnetic mixing tank 4, and a coagulation aid tank 5 by two staggered partition plates 16. This staggered arrangement allows the wastewater to flow sequentially through each tank under gravity, eliminating the need for additional power transmission and saving energy. Each of the coagulation tank 3, magnetic mixing tank 4, and coagulation aid tank 5 is equipped with a stirring mechanism 2, which enhances the mixing reaction effect within each tank. The circular sedimentation tank 6 is fixed to the side of the magnetic flocculation sedimentation tank 2 near the coagulation aid tank 5 and is connected to the inner cavity of the coagulation aid tank 5, facilitating the entry of wastewater treated by the coagulation aid tank 5 for sedimentation. The internal sludge scraping mechanism promptly removes the sludge generated during sedimentation, ensuring the continuous and stable operation of the circular sedimentation tank 6.

[0024] A magnetic mud pump 21 is installed on the outer wall of the circular sedimentation tank 6, and a magnetic mud separator 22 is installed on the outer wall of the magnetic flocculation sedimentation tank 2. The suction end of the magnetic mud pump 21 is connected to the bottom cavity of the circular sedimentation tank 6, which can smoothly suck out the sludge at the bottom of the circular sedimentation tank 6. Its output end is connected to the magnetic mud separator 22, so that the sludge enters the magnetic mud separator 22 for treatment. The magnetic mixing tank 4 is connected to the magnetic mud separator 22. The magnetic powder and other materials separated by the magnetic mud separator 22 can be transported back to the magnetic mixing tank 4 for reuse, realizing the recycling of resources and reducing the operating cost of the system.

[0025] The stirring mechanism includes a support frame 7, a motor 8, a rotating shaft 9, and a stirring paddle 10. The support frame 7 is fixedly connected to the top of the reactor 1, providing stable support for the entire stirring mechanism. The rotating shaft 9 is rotatably connected to the outer wall of the middle section of the support frame 7. The stirring paddle 10 is fixedly connected to the bottom end of the rotating shaft 9. The motor 8 is fixedly installed on the top outer wall of the support frame 7, and its output shaft is fixedly connected to the top end of the rotating shaft 9. When the motor 8 is started, the output shaft drives the rotating shaft 9 to rotate, which in turn causes the stirring paddle 10 to rotate inside the reactor 1. This ensures that the reaction agent introduced into the reactor 1 is fully mixed with the mine wastewater, ensuring that the chemical reaction proceeds fully and improving the pretreatment effect.

[0026] A pump 11 is fixedly installed on the outer wall of the magnetic flocculation sedimentation tank 2. The suction end of the pump 11 is connected to the inner cavity of the reactor 1, which can draw out the pretreated wastewater in the reactor 1. Its output end is connected to the coagulation tank 3, which can accurately transport the drawn wastewater to the coagulation tank 3 for the next coagulation treatment, thus realizing the orderly transportation of wastewater between the reactor 1 and the coagulation tank 3.

[0027] The second stirring mechanism includes a second support frame 12, a second motor 13, a second rotating shaft 14, and a second stirring paddle 15. The second support frame 12 is fixedly connected to the top outer wall of the magnetic flocculation sedimentation tank 2, providing stable installation support for the second stirring mechanism. Multiple second rotating shafts 14 are rotatably connected to the inner wall of the second support frame 12. The second stirring paddle 15 is fixedly connected to the bottom outer wall of the second rotating shaft 14. Multiple second motors 13 are fixedly installed on the top outer wall of the second support frame 12, and the end of their output shafts is fixedly connected to the top of the second rotating shaft 14. When the coagulation tank 3, the magnetic mixing tank 4, and the coagulation aid tank 5 are working, the corresponding second motor 13 starts, and the output shaft drives the second rotating shaft 14 to rotate, which in turn causes the second stirring paddle 15 to rotate, thereby stirring and mixing the wastewater and reagents in each tank, enhancing the reaction effect, and ensuring that the coagulation, magnetic mixing, and coagulation aid processes are fully carried out.

[0028] The sludge scraping mechanism includes a support frame 17, a motor 18, a rotating shaft 19, and a scraper blade 20. The support frame 17 is fixedly connected to the top outer wall of the circular sedimentation tank 6, providing a stable installation base for the sludge scraping mechanism. The rotating shaft 19 is rotatably connected to the outer wall of the support frame 17. The scraper blade 20 is fixedly connected to the bottom end of the rotating shaft 19 and fits against the bottom inner wall of the circular sedimentation tank 6. The motor 18 is fixedly installed on the top outer wall of the support frame 17, and its output shaft end is fixedly connected to the top end of the rotating shaft 19. When the motor 18 starts, the output shaft drives the rotating shaft 19 to rotate, thereby causing the scraper blade 20 to rotate on the bottom inner wall of the circular sedimentation tank 6, scraping the settled sludge to the designated sludge collection area. This facilitates centralized sludge treatment and prevents sludge from accumulating at the bottom of the circular sedimentation tank 6, which would affect the sedimentation effect.

[0029] The outer wall of the circular sedimentation tank 6 is provided with an outlet 23. The purified water that meets the standards after being treated by the entire system can be discharged through the outlet 23 for reuse scenarios such as coal preparation and mineral processing water in the mining area, underground or surface dust control and fire fighting water, or directly discharged when the discharge requirements are met.

[0030] The implementation principle of the chemical purification system for mine wastewater in this application embodiment is as follows: Mine wastewater first enters reactor 1. The core of this step is based on the chemical precipitation and adsorption reaction mechanism. By introducing targeted reaction agents (such as calcium salt agents for fluoride ions, sulfide agents for heavy metals, etc.) into reactor 1, under the mechanical stirring action of the agitator 10, the agents are fully contacted with the target pollutants such as suspended solids, fluoride, arsenic, and heavy metals in the wastewater. At this time, the pollutants and the agents undergo chemical reactions. Fluoride ions combine with calcium ions to form calcium fluoride precipitate, heavy metal ions combine with sulfides to form sulfide precipitate, and suspended solids are initially coagulated through the adsorption bridging effect of the agents, thus completing the preliminary removal of pollutants in the pretreatment stage.

[0031] The pretreated wastewater enters the coagulation tank 3 via pump 11. The coagulant (such as PAC) added in the tank, under the stirring action of the agitator 15, causes the fine suspended particles and colloidal substances in the wastewater to lose stability through compression of the double electric layer and adsorption charge neutralization, and they collide with each other to form micro flocs, laying the foundation for the subsequent magnetic flocculation reaction.

[0032] After the wastewater passes through the separator 16 and enters the magnetic mixing tank 4, the system introduces magnetic powder and specific reactive agents (such as calcium-aluminum LDH layered bimetallic hydroxide for sulfate). Under the high-intensity stirring of the agitator 15, the magnetic powder is uniformly dispersed and combines with the micro-flocs formed during the coagulation stage. At the same time, the LDH agent efficiently adsorbs anions such as SO4²⁻ and Cl⁻ in the wastewater through interlayer anion exchange, causing the pollutants to form magnetic composite flocs with the magnetic powder and the agent. This process couples the enhanced sedimentation effect of magnetic flocculation, significantly improving the pollutant removal efficiency.

[0033] The wastewater entering the coagulation aid tank 5 is gently stirred by the agitator 15. The added coagulator (such as PAM) causes the magnetic composite flocs to grow further through the bridging effect of the polymer chains, forming large-particle flocs with stable structure and excellent settling performance, creating favorable conditions for subsequent sedimentation and separation.

[0034] Wastewater treated with coagulation aid enters the circular sedimentation tank 6. Relying on gravity settling, the magnetic composite flocs quickly sink to the bottom of the tank, achieving solid-liquid separation. The supernatant is the pre-purified water, which can be discharged through the outlet 23. The sludge settled at the bottom is collected in the sludge collection area by the mechanical scraping action of the scraper 20. This process utilizes the characteristics of magnetic flocs having a high specific gravity and fast settling speed. Compared with traditional sedimentation tanks, the separation efficiency is improved by more than 30%.

[0035] The sludge at the bottom of the circular sedimentation tank 6 is pumped to the magnetic mud separator 22 by the magnetic mud pump 21. The magnetic powder is separated from the sludge through physical separation. The separated magnetic powder is transported back to the magnetic mixing tank 4 for recycling. This not only reduces the cost of magnetic powder consumption, but also reduces the amount of sludge discharged. The LDH precipitates and other substances contained in the sludge can be further processed and recycled to achieve resource utilization.

[0036] The system as a whole adopts a synergistic process of "TT+R high-efficiency chemical reaction + M magnetic flocculation + FLO precipitation": the TT+R reactor enhances the reaction efficiency between pollutants and reagents, M magnetic flocculation improves the floc settling performance through magnetic carriers, and FLO precipitation achieves efficient solid-liquid separation. For high-salt mine wastewater, it can also be coupled with the ECR electrochemical reaction mechanism. The aluminum ions generated by the electrode react with the anions in the wastewater to generate LDH layered bimetallic hydroxide. Utilizing its interlayer anion exchange characteristics, it deeply removes dissolved pollutants such as TDS and SO4²⁻, so that the treated effluent hardness is ≤50mg / L, SO4²⁻≤100mg / L, and TDS≤1600mg / L, meeting the stringent standards for reuse or discharge.

[0037] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0038] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0039] Finally: 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 chemical purification and treatment system for mine wastewater, characterized in that: The system includes a reactor (1), a magnetic flocculation sedimentation tank (2), and a circular sedimentation tank (6). The reactor (1) is equipped with a stirring mechanism for introducing reaction reagents. The magnetic flocculation sedimentation tank (2) is equipped with a coagulation tank (3), a magnetic mixing tank (4), and a coagulation aid tank (5) in sequence. The coagulation tank (3), the magnetic mixing tank (4), and the coagulation aid tank (5) are separated by two partition plates (16), which are arranged at different heights. The coagulation tank (3), the magnetic mixing tank (4), and the coagulation aid tank (5) are all equipped with a stirring mechanism. The circular sedimentation tank (6) is fixedly connected to the magnetic flocculation sedimentation tank (2) on the side near the coagulation aid tank (5), and the circular sedimentation tank (6) is connected to the inner cavity of the coagulation aid tank (5). The circular sedimentation tank (6) is equipped with a sludge scraping mechanism.

2. The mine wastewater chemical purification system according to claim 1, characterized in that: A magnetic mud pump (21) is installed on the outer wall of the circular sedimentation tank (6), and a magnetic mud separator (22) is installed on the outer wall of the magnetic flocculation sedimentation tank (2). The suction end of the magnetic mud pump (21) is connected to the bottom cavity of the circular sedimentation tank (6), and its output end is connected to the magnetic mud separator (22). The magnetic mixing tank (4) is connected to the magnetic mud separator (22).

3. The mine wastewater chemical purification system according to claim 2, characterized in that: The stirring mechanism includes a support (7), a motor (8), a rotating shaft (9), and a stirring paddle (10). The support (7) is fixedly connected above the reactor (1). The rotating shaft (9) is rotatably connected to the outer wall of the middle section of the support (7). The stirring paddle (10) is fixedly connected to the bottom end of the rotating shaft (9). The motor (8) is fixedly installed on the top outer wall of the support (7), and its output shaft is fixedly connected to the top end of the rotating shaft (9).

4. The mine wastewater chemical purification system according to claim 1, characterized in that: A pump (11) is fixedly installed on the outer wall of the magnetic flocculation sedimentation tank (2). The suction end of the pump (11) is connected to the inner cavity of the reactor (1), and its output end is connected to the coagulation tank (3).

5. The mine wastewater chemical purification system according to claim 1, characterized in that: The stirring mechanism includes a support frame (12), a motor (13), a rotating shaft (14), and a stirring paddle (15). The support frame (12) is fixedly connected to the top outer wall of the magnetic flocculation sedimentation tank (2). Multiple rotating shafts (14) are rotatably connected to the inner wall of the support frame (12). The stirring paddle (15) is fixedly connected to the bottom outer wall of the rotating shaft (14). Multiple motors (13) are fixedly installed on the top outer wall of the support frame (12), and the end of their output shafts is fixedly connected to the top of the rotating shaft (14).

6. The mine wastewater chemical purification system according to claim 1, characterized in that: The sludge scraping mechanism includes a support three (17), a motor three (18), a rotating shaft three (19), and a scraper plate (20). The support three (17) is fixedly connected to the top outer wall of the circular sedimentation tank (6). The rotating shaft three (19) is rotatably connected to the outer wall of the support three (17). The scraper plate (20) is fixedly connected to the bottom end of the rotating shaft three (19) and fits against the bottom inner wall of the circular sedimentation tank (6). The motor three (18) is fixedly installed on the top outer wall of the support three (17), and the end of its output shaft is fixedly connected to the top end of the rotating shaft three (19).

7. The mine wastewater chemical purification system according to claim 1, characterized in that: The outer wall of the circular sedimentation tank (6) is provided with an outlet (23).

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