Modularized pre-sedimentation tank suitable for strip mine water treatment and pre-sedimentation method

Abstract

The invention discloses a modular pre-sedimentation tank suitable for strip mine water treatment and a pre-sedimentation method, and belongs to the technical field of strip mine water treatment. A plurality of tank bodies are formed in the modular pre-sedimentation tank, and each tank body is internally provided with a modular mud storage system; the modular sludge storage system is provided with a flow control system for controlling water inlet and outlet, a drying sludge discharge system is arranged above the modular pre-sedimentation tank, and the drying sludge discharge system can lift the modular sludge storage system from the tank body to drain off the modular sludge storage system and then discharge sludge in a moving manner. According to the invention, frequent faults of the pre-sedimentation regulation sludge treatment system of the open pit coal mine water treatment station are reduced, the sludge discharge period is prolonged, the service life of the filter cloth of the sludge discharge system is prolonged, the water content of discharged coal slime is reduced, the energy consumption is reduced, a sludge scraping and sucking machine and a filter pressing system in the regulation tank are protected, and stable operation of the pre-sedimentation regulation system in mine water treatment is ensured.

Description

Technical Field

[0001] The invention relates to a modular pre-sedimentation tank and a pre-sedimentation method suitable for open-pit mine water treatment, belonging to the technical field of open-pit mine water treatment. Background Art

[0002] Coal mine water refers to all the water that seeps into the underground mining space during the coal mining process, and sometimes also contains a small amount of surface water that seeps in. The main technologies for treating coal mine water include: neutralizing acidic water, removing suspended particles by flocculation treatment, removing soluble salts by reverse osmosis, and other technologies and combinations. Various methods are used to remove or reduce harmful substances in mine water so that it meets the discharge standards and the requirements of the receiving water environmental quality standards, or is treated to the target water quality for various needs.

[0003] The pre-sedimentation and adjustment treatment link of the traditional mine water treatment station is generally composed of a pre-sedimentation adjustment tank, a traveling scraper and suction mud machine, a mud pump and a filter press system. The scraper and suction mud machine of this system often has the phenomenon of bottom mud compaction, scraper deformation or driving running all over when the mud concentration is high, the coal mud sedimentation is uneven or the mud discharge is not timely; the mud pump often has the phenomenon of mud discharge pipeline blockage due to discontinuous mud discharge; for open-pit mines, there will be a phenomenon of mine water and initial rainwater confluence during the rainy season, and the gravel and large pieces of gangue and other pollutants brought by rainwater erosion will enter the mud discharge system and cause accidents of filter cloth damage. The above problems of the traditional pre-sedimentation adjustment system often occur in the mine water treatment of open-pit mines, becoming the main factor restricting the development of open-pit mine water treatment technology. Therefore, it is necessary to invent a new pre-sedimentation tank suitable for open-pit mine water treatment, which is used before the adjustment tank to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a modular pre-sedimentation tank and a pre-sedimentation method suitable for open-pit mine water treatment. For open-pit mine water treatment stations with high influent suspended matter concentration and inability to completely divert rainwater and mine water, the present invention reduces the occurrence of frequent failures of the pre-sedimentation regulating sludge treatment system of the open-pit coal mine water treatment station, extends the sludge discharge cycle, extends the service life of the filter cloth of the sludge discharge system, reduces the water content of the discharged coal sludge, reduces energy consumption, protects the scraper and suction sludge machine and the filter press system in the regulating tank, and ensures the stable operation of the pre-sedimentation regulating system in mine water treatment.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] In the first aspect, the present invention provides a modular pre-sedimentation tank suitable for open-pit mine water treatment, wherein a plurality of tank bodies are opened in the modular pre-sedimentation tank, and a modular mud storage system is installed in each tank body, and the modular mud storage system is installed with a flow control system for controlling the inlet and outlet of water, and a drying mud discharge system is installed above the modular pre-sedimentation tank, and the drying mud discharge system can lift the modular mud storage system from the tank body and drain it, and then unload the sludge by moving it.

[0007] Furthermore, the modular mud storage system includes four groups of mud storage tanks divided according to the size of the modular pre-sedimentation tank body, and the four groups of mud storage tanks are arranged and distributed along the water flow direction.

[0008] Furthermore, the mud storage tank includes a steel mud storage tank wall and a double-layer tank bottom, wherein the upper tank bottom is a steel mud storage tank water filtration bottom plate, and the lower tank bottom is a steel mud storage tank water-stop bottom plate with a steel plate structure, and steel guide rails and electric gates are installed on the surface of the steel mud storage tank water-stop bottom plate.

[0009] Furthermore, the water filtering bottom plate of the steel sludge storage tank adopts a steel grating plate structure, and the grating gap is 5mm, and the water-stop bottom plate of the steel sludge storage tank is made of a solid steel plate.

[0010] Furthermore, the flow control system includes an electric valve installed on the top of the steel mud storage tank wall.

[0011] Furthermore, an inspection door is installed on the wall surface of the steel mud storage tank.

[0012] Furthermore, a lifting pull ring is installed on the top of the steel mud storage tank wall.

[0013] Furthermore, the modular mud storage system includes a set of spare mud storage tanks, and the spare mud storage tanks are located in a placement area outside the modular pre-sedimentation tank close to the water inlet direction.

[0014] Furthermore, the drying and mud discharge system includes a steel support column installed on the periphery of the pre-sedimentation tank, a steel beam installed on the top of the steel support column, and an electric hoist that moves on the steel beam and can lift the modular mud storage system for mud unloading.

[0015] In a second aspect, the present invention provides a modular pre-sedimentation method suitable for open-pit mine water treatment, comprising the following steps:

[0016] Step 1: Turn on the flow control system, and the mine water inflow flows through each mud storage tank in the modular mud storage system for pre-sedimentation;

[0017] Step 2: When the amount of coal slime deposited in the first mud storage tank close to the water inlet direction in the modular mud storage system reaches a specified value, the flow control system corresponding to the first mud storage tank is closed;

[0018] Step 3: Start the electric hoist in the drying and mud discharge system, hang the mud storage tank and lift it to the highest point, then move it to the top of other mud storage tanks for drainage. When the coal slime in the tank is completely dried, move the electric hoist to move the mud storage tank to the outside of the pre-sedimentation tank to unload the sludge;

[0019] Step 4: Move the electric hoist to move the spare mud storage tank into the pool body of the mud storage tank 1, and open the corresponding flow control system to allow the mine water to continue to flow in.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention adds a pre-settling unit in front of the regulating tank, divides the pre-settling system into grids and lines it with a modular mud storage system, cooperates with a drying mud discharge system and a flow control system, and when the coal sludge in the mud storage tank is nearly full, closes the front and rear electric gate valves, lifts the mud storage tank that needs to be discharged to the upper part of the regulating tank, and discharges the excess water in the mud storage tank to other mud storage tanks through the bottom electric valve by an electric hoist. The mud storage tank stays in the air for natural drying. After the drying is completed, the electric hoist is moved to move the mud storage tank to the coal sludge unloading area, and the mud truck pulls it away. During the sludge drying period, the spare mud storage tank is placed in the lifting grid to maintain the normal operation of the system. This pre-settling tank does not have the problem of coal sludge compaction affecting the operation of the system, can maximize the extension of the mud discharge cycle, discharges the coal sludge to dry naturally, does not pass through the coal sludge filter press system, does not need to consider the problem of large particles damaging the filter cloth, greatly reduces the mud intake and mud particle size of the regulating tank, protects the scraper and suction mud machine in the regulating tank, and is particularly suitable for open-pit mine water treatment systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 A schematic plan view of a modular pre-sedimentation tank and a pre-sedimentation method suitable for open-pit mine water treatment provided in the first embodiment of the present invention;

[0024] Figure 2 A schematic cross-sectional view of a modular pre-sedimentation tank and a pre-sedimentation method suitable for open-pit mine water treatment provided in the first embodiment of the present invention;

[0025] Figure 3 A schematic plan view of a waterproof bottom plate of a steel mud storage tank for a modular pre-sedimentation tank and a pre-sedimentation method for open-pit mine water treatment provided in the first embodiment of the present invention;

[0026] Figure 4 A schematic side view of a sludge storage tank of a modular pre-sedimentation tank and a pre-sedimentation method suitable for open-pit mine water treatment provided in Example 1 of the present invention.

[0027] In the figure: 1. Mud storage tank; 101. Steel mud storage tank wall; 102. Steel mud storage tank water filter bottom plate; 103. Steel mud storage tank water stop bottom plate; 104. Install steel guide rails; 105. Electric gate; 106. Maintenance door; 107. Spare mud storage tank; 108. Lifting pull ring; 201. Steel support column; 202. Steel beam; 203. Electric hoist; 3. Electric gate valve. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0029] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0030] Embodiment 1:

[0031] The present invention provides Figures 1 to 4 A modular pre-sedimentation tank suitable for open-pit mine water treatment is shown, comprising a modular mud storage system, a drying mud discharge system and a flow control system, wherein:

[0032] The modular mud storage system includes a plurality of mud storage tanks 1 arranged and distributed along the water flow direction. The mud storage tank 1 is installed in the pre-sedimentation tank and can be lifted. The mud storage tank 1 includes a steel mud storage tank wall 101 and a double-layer tank bottom with a steel plate structure. The first layer is a steel mud storage tank water filtering bottom plate 102 with a steel grating plate structure, and the grating gap is 5mm. The second layer is a steel mud storage tank water stop bottom plate 103 with a steel plate structure, which is made of solid steel plate; a steel guide rail 104 and an electric gate 105 are installed on the surface of the steel mud storage tank water stop bottom plate 103, and an inspection door 106 is installed on the surface of the steel mud storage tank wall 101; a lifting pull ring 108 is installed on the top of the steel mud storage tank wall 101; a spare mud storage tank 107 is arranged outside the pre-sedimentation tank;

[0033] The drying mud discharge system includes a steel support column 201 installed on the periphery of the pre-sedimentation tank, a steel beam 202 installed on the top of the steel support column 201, and an electric hoist 203 that moves on the steel beam 202 and can lift the modular mud storage system. The electric hoist 203 can lift the mud storage tank 1 using the lifting pull ring 108;

[0034] The flow control system comprises an electric gate valve 3 which is installed in the pre-sedimentation tank and can control the water inlet and outlet of each modular mud storage system.

[0035] Specific working process: after calculating the volume of the pre-sedimentation tank of the mine water treatment station according to the treatment scale of the mine water, the regulating water tank is divided into several tank bodies according to the calculation results. Each tank body (axis spacing) is 3m long, 2.02m wide and 2.035m deep. The electric valve 3 is installed on the top of the steel mud storage tank wall 101. The steel support column 201 and the steel beam 202 for fixing the electric hoist 203 are installed along the long side direction of the pre-sedimentation tank. The height of the steel support column 201 is set to ensure that the lifting space below the electric hoist 203 meets the lifting needs of the mud storage tank and the loading needs after the coal slime is dried. The pre-sedimentation tank is close to the water inlet direction as the spare mud storage tank 107 placement area, and away from the water inlet direction as the coal slime loading area. The length of the steel support column 201 exceeds the outer wall of the pre-sedimentation tank by 4.5m on the left and 5m on the right. In this figure, taking 6 groups of tank bodies as an example, the normal working conditions of the pre-sedimentation tank and the conditions during the coal slime drying process are described.

[0036] Normal working conditions: Under normal working conditions, all electric valves 3 in the figure are open, electric valve 105 is closed, and electric hoist 203 is in a non-working state. The mine water flows from left to right through each pre-sedimentation tank to achieve the function of pre-sedimentation. The water after sedimentation and pre-sedimentation flows into the subsequent processing unit by gravity, and the precipitated coal slime is deposited at the bottom of each mud storage tank.

[0037] Drying and sludge discharge working condition: As the coal sludge is continuously deposited in each sludge storage tank, the amount of coal sludge deposited from the water inlet direction to the water outlet direction increases, and the amount of coal sludge deposited near the water inlet direction is the largest. When the coal sludge deposited is close to three-quarters of the total height of the sludge storage tank (because the deposition surface of the coal sludge may be non-planar, it is not easy to observe whether the coal sludge deposited has reached three-quarters of the total height of the sludge storage tank in actual operation. Here, a weight sensor can be set at the bottom of the sludge storage tank to detect the amount of sludge stored in the sludge storage tank. When the weight of the sludge in the sludge storage tank reaches the specified value, the sensor sends a signal to remind the outside, so as to facilitate timely cleaning of the coal sludge), close the leftmost switch. The electric valves 3 in front and behind the mud tank 1 on the side are opened, the electric hoist 203 is started to hang the lifting ring 108 to lift the mud tank 1 to the highest point, and the mud tank 1 is moved to the top of the mud tanks in other grids by moving the electric hoist 203, and the electric valve 105 is opened to drain the water in the mud tank. The mud tank stays at a high place. After the coal slime in the tank is completely dried, the electric hoist 203 is moved to move the mud tank 1 outside the pre-sedimentation tank, and directly transferred to the sludge transport vehicle through the lifting ring 108. The mud in the mud tank is unloaded from the top to the sludge transport vehicle through the sludge dump truck. If it is not cleaned up, the inspection door 106 can be opened for manual cleaning. After unloading the mud, the mud tank is moved to the left side of the pre-sedimentation tank and waits for the next use.

[0038] Each group of regulating water tanks has a spare mud storage tank 107 along the water inlet direction. After the mud storage tank enters the working condition of drying and discharging mud, the spare mud storage tank 107 is moved to its corresponding grid pre-sedimentation tank, and the front and rear water inlet valves of the grid pre-sedimentation tank are opened to enter the normal working condition.

[0039] This solution can be used for open-pit mine water treatment stations where the concentration of suspended solids in the influent is high and rainwater and mine water cannot be completely diverted. The present invention can reduce the frequent failures of the pre-settling and regulating sludge treatment system of the open-pit coal mine water treatment station, extend the sludge discharge cycle, extend the service life of the filter cloth of the sludge discharge system, reduce the water content of the discharged coal sludge, reduce energy consumption, protect the scraper and suction sludge machine and filter press system in the regulating tank, and ensure the stable operation of the pre-settling and regulating system in mine water treatment.

[0040] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its essence or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the essence and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A modular pre-sedimentation tank suitable for open-pit mine water treatment, characterized in that: A plurality of tank bodies are provided in the modular pre-sedimentation tank, and a modular sludge storage system is installed in each tank body. The modular sludge storage system is installed with a flow control system for controlling the inflow and outflow of water. A drying sludge discharge system is installed above the modular pre-sedimentation tank. The drying sludge discharge system can lift the modular sludge storage system from the tank body, drain it, and then remove the sludge by moving it.

2. The modular pre-sedimentation tank suitable for open-pit mine water treatment according to claim 1 is characterized in that: The modular mud storage system comprises four groups of mud storage tanks (1) divided according to the size of the modular pre-sedimentation tank body, and the four groups of mud storage tanks (1) are arranged and distributed along the water flow direction.

3. The modular pre-sedimentation tank suitable for open-pit mine water treatment according to claim 2 is characterized in that: The mud storage tank (1) comprises a steel mud storage tank wall (101) and a double-layer tank bottom, wherein the upper tank bottom is a steel mud storage tank water filtering bottom plate (102), and the lower tank bottom is a steel mud storage tank water stop bottom plate (103) with a steel plate structure, and a steel guide rail (104) and an electric gate (105) are installed on the surface of the steel mud storage tank water stop bottom plate (103).

4. The modular pre-sedimentation tank suitable for open-pit mine water treatment according to claim 3 is characterized in that: The steel mud storage tank water filtering bottom plate (102) adopts a steel grating plate structure, and the grating gap is 5mm, and the steel mud storage tank water stop bottom plate (103) is made of a solid steel plate.

5. The modular pre-sedimentation tank suitable for open-pit mine water treatment according to claim 3 is characterized in that: The flow control system comprises an electric valve (3) installed on the top of the steel mud storage tank wall (101).

6. The modular pre-sedimentation tank suitable for open-pit mine water treatment according to claim 3 is characterized in that: An inspection door (106) is installed on the surface of the steel mud storage tank wall (101).

7. The modular pre-sedimentation tank suitable for open-pit mine water treatment according to claim 3 is characterized in that: A lifting pull ring (108) is installed on the top of the steel mud storage tank wall (101).

8. The modular pre-sedimentation tank suitable for open-pit mine water treatment according to claim 1 is characterized in that: The modular mud storage system comprises a set of spare mud storage tanks (107), and the spare mud storage tanks (107) are located in a placement area outside the modular pre-sedimentation tank close to the water inlet direction.

9. The modular pre-sedimentation tank suitable for open-pit mine water treatment according to claim 1 is characterized in that: The drying mud discharge system comprises a steel support column (201) installed on the periphery of the pre-sedimentation tank, a steel beam (202) installed on the top of the steel support column (201), and an electric hoist (203) that moves on the steel beam (202) and can lift the modular mud storage system for mud discharge.

10. A modular pre-sedimentation method for treating open-pit mine water, characterized in that: The steps include: Step 1: Turn on the flow control system, and the mine water inflow flows through each mud storage tank in the modular mud storage system for pre-sedimentation; Step 2: When the amount of coal slime deposited in the first mud storage tank close to the water inlet direction in the modular mud storage system reaches a specified value, the flow control system corresponding to the first mud storage tank is closed; Step 3: Start the electric hoist in the drying and mud discharge system, hang the mud storage tank and lift it to the highest point, then move it to the top of other mud storage tanks for drainage. When the coal slime in the tank is completely dried, move the electric hoist to move the mud storage tank to the outside of the pre-sedimentation tank to unload the sludge; Step 4: Move the electric hoist to move the spare mud storage tank into the pool body of the mud storage tank 1, and open the corresponding flow control system to allow the mine water to continue to flow in.

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