Mine water treatment device

Abstract

The invention discloses a mine water treatment device, and belongs to the technical field of mine water treatment. The device comprises a pre-precipitation tank and an electrochemical softening device, a main water inlet pipe and a feeding tank are arranged on the pre-precipitation tank, and an inner cavity of the electrochemical softening device is divided into an anode chamber, a cathode chamber, an anode chamber and a cathode chamber through a vertical partition composed of a closed partition plate and a cation exchange membrane. The tops of the two cathode chambers are connected with the top of the pre-precipitation tank, and the tops of the two anode chambers are connected with the softening water outlet pipe. The device is scientific in design, reasonable in structure, easy to manufacture, convenient to use and good in treatment effect, the purpose of softening mine water can be achieved by using the device, and the recycling rate of the mine water is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine production, and particularly relates to the treatment of mine water, in particular to a mine water treatment device. Background Art

[0002] Coal resources are important energy and chemical raw materials for human life. The global coal resources are large in reserves, widely distributed and have high output. However, coal mining produces a large amount of mine water. According to statistics, in the Netherlands and China, about 2 tons of mine water are produced for every ton of coal mined; in the UK, about 3 tons of mine water are produced for every ton of coal mined. Based on this, it is estimated that one trillion tons of mine water are produced worldwide every year.

[0003] However, due to the dual influence of natural water-rock interaction and human mining activities, mine water contains pollutants such as suspended matter, salt, and special components. Direct and disorderly discharge will induce many problems such as water resource waste, water environment pollution, and surface ecological damage. Therefore, it is very important to treat mine water resources for production, life, ecology, etc. At the same time, if mine water can be used reasonably, it will also greatly alleviate the shortage of water resources.

[0004] Mine water can be used for dust reduction in coal mines, but the current problem is that there is some coal dust and rock dust in the mine water, and there are many scaling ions, which not only affect the dust reduction effect, but also cause the clogging of the dust reduction atomizing nozzle. This leads to an increase in the cost of mine water reuse and fails to achieve the original effect. A mine water treatment technology is urgently needed.

[0005] At present, the conventional mine water treatment methods mainly include: chemical softening method, ion exchange method and membrane separation technology. Chemical softening method is to roughly remove scaling ions in mine water by adding chemicals to mine water, but it cannot deeply remove scaling ions; ion exchange method has mature technology and high removal rate, but the disadvantage is that ion exchange membrane needs to be regenerated, the regeneration process is relatively cumbersome, and it will increase the mining cost; the most widely used membrane separation technology is electrodialysis, which is a combination of electrolysis and dialysis diffusion. It uses the selective permeability of ion exchange membrane, that is, cationic membrane theoretically only allows cations to pass through, and anionic membrane theoretically only allows anions to pass through. Under the action of an external DC electric field, anions and cations move to the anode and cathode respectively. If the fixed charge of the membrane is opposite to the charge of the ion, the ion can pass through. If their charges are the same, the ion is repelled, so that fresh water can be produced. Summary of the invention

[0006] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide a mine water treatment device of a completely new design.

[0007] The present invention is achieved through the following technical solutions: A mine water treatment device comprises a pre-precipitation tank and an electrochemical softening device.

[0008] A main water inlet pipe is arranged on the side wall of the pre-precipitation tank, and a first peristaltic pump is arranged on the main water inlet pipe; a feeding pipe is arranged on the top of the pre-precipitation tank, and a feeding tank is arranged on the top of the feeding pipe.

[0009] The electrochemical softening device comprises an insulating shell, the inner cavity of which is divided into four compartments by three vertical partitions, the upper part of each vertical partition is arranged as a closed partition, and the lower part is arranged as a cation exchange membrane; the four compartments are, from left to right, a first anode chamber, a first cathode chamber, a second anode chamber, and a second cathode chamber, and the first anode chamber and the second anode chamber are both provided with a positive electrode, and the first cathode chamber and the second cathode chamber are both provided with a negative electrode; the tops of the first cathode chamber and the second cathode chamber are both connected to a softening water inlet pipe, the other end of the softening water inlet pipe is connected to the top of a pre-precipitation tank, and a second peristaltic pump is arranged on the softening water inlet pipe; the tops of the first anode chamber and the second anode chamber are both connected to a softening water outlet pipe.

[0010] Furthermore, conductivity monitors are provided on both the softening water inlet pipe and the softening water outlet pipe.

[0011] Furthermore, valves are arranged on the main water inlet pipe, the feeding pipe, the softening water inlet pipe and the softening water outlet pipe.

[0012] Furthermore, the pre-sedimentation tank comprises a detachably connected tank body and a tank bottom, and the tank bottom is an inverted triangle-shaped tank bottom.

[0013] Furthermore, aluminum chloride is added into the feeding tank.

[0014] Furthermore, the insulating shell includes a detachably connected shell body and a shell bottom, and the shell bottom is provided with four semicircular chamber bottoms, which are the chamber bottoms of the first anode chamber, the first cathode chamber, the second anode chamber, and the second cathode chamber respectively.

[0015] Furthermore, both the anode electrode and the cathode electrode are made of ruthenium-iridium-titanium electrodes, which are mesh-shaped, 1 meter in diameter and 5 cm in thickness.

[0016] Furthermore, the overall dimensions of the electrochemical softening device are 5 m in length, 1 m in width and 1 m in height.

[0017] Furthermore, the sedimentation time of the mine water in the pre-sedimentation tank is 10 minutes.

[0018] Furthermore, the time for softening the mine water in the electrochemical softening device is 10 minutes.

[0019] The device of the present invention has scientific design, reasonable structure, simple manufacture, convenient use and good treatment effect. The use of the device of the present invention can soften the mine water and improve the reuse rate of the mine water. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings herein are used to provide further explanation of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their description are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] Figure 1 It is a schematic diagram of the structure of the device of the present invention.

[0022] Figure 2 It is a plan view schematic diagram of the anode electrode and the cathode electrode in the device of the present invention.

[0023] In the figure: 1-pre-precipitation tank, 2-electrochemical softening device, 3-main water inlet pipe, 4-first peristaltic pump, 5-feeding tank, 6-enclosed partition, 7-cation exchange membrane, 8-first anode chamber, 9-first cathode chamber, 10-second anode chamber, 11-second cathode chamber, 12-positive electrode, 13-negative electrode, 14-softening water inlet pipe, 15-second peristaltic pump, 16-softening water outlet pipe, 17-conductivity monitor. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "left", "right", "upper", "lower", "bottom", "top" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] This embodiment provides a mine water treatment device, such as Figure 1 and Figure 2 As shown, it includes a pre-precipitation tank 1 and an electrochemical softening device 2.

[0028] A main water inlet pipe 3 is installed on the side wall of the pre-sedimentation tank 1 , and a first peristaltic pump 4 is installed on the main water inlet pipe 3 ; a feeding pipe is connected to the top of the pre-sedimentation tank 1 , and a feeding tank 5 is installed on the top of the feeding pipe.

[0029] For the above-mentioned pre-precipitation tank 1, the pre-precipitation tank 1 includes a detachably connected tank body and a tank bottom. The tank bottom adopts an inverted triangular tank bottom. Compared with a flat tank bottom, the inverted triangular tank bottom is easier to precipitate, collect and clean large particles of impurities, and the sedimentation effect will be better. When it is necessary to clean the precipitated impurities, the inverted triangular tank bottom can be opened for cleaning, which is convenient and quick. Aluminum chloride (PAC) is filled in the feeding tank 5. Aluminum chloride (PAC) is a coagulant with strong interfacial adsorption capacity. It can form surface precipitation under high concentration and high pH conditions, and can be converted from polyaluminum to aluminum gel until aluminum hydroxide precipitation. Valves are provided on the main water inlet pipe 3 and the feeding pipe for easy control and adjustment.

[0030] The electrochemical softening device 2 comprises an insulating shell, the inner cavity of which is divided into four compartments by three vertical partitions, the upper part of each vertical partition being provided with a closed partition 6 and the lower part being provided with a cation exchange membrane 7, i.e., only cations can pass through the lower part; the four compartments are, from left to right, a first anode chamber 8, a first cathode chamber 9, a second anode chamber 10, and a second cathode chamber 11, wherein both the first anode chamber 8 and the second anode chamber 10 are provided with an anode electrode 12, and both the first cathode chamber 9 and the second cathode chamber 11 are provided with a cathode electrode 13; the tops of the first cathode chamber 9 and the second cathode chamber 11 are connected with a softening water inlet pipe 14, the other ends of the softening water inlet pipe 14 are connected with the top of the pre-precipitation tank 1, and a second peristaltic pump 15 is provided on the softening water inlet pipe 14; the tops of the first anode chamber 8 and the second anode chamber 10 are connected with a softening water outlet pipe 16.

[0031] For the above-mentioned electrochemical softening device 2, its overall size is 5m long, 1m wide and 1m high. The insulating shell includes a detachable shell body and a shell bottom, and four semicircular chamber bottoms are arranged on the shell bottom, and the four semicircular chamber bottoms are respectively the chamber bottom of the first anode chamber 8, the chamber bottom of the first cathode chamber 9, the chamber bottom of the second anode chamber 10 and the chamber bottom of the second cathode chamber 11. The chamber bottom of each electrode chamber is set as a semicircular chamber bottom, which is easier to precipitate, collect and clean up impurities, and the sedimentation effect will be better. When it is necessary to clean up the precipitated impurities, the shell bottom can be opened to clean up, which is convenient and quick. The positive electrode 12 and the negative electrode 13 are both ruthenium iridium titanium electrodes, which are mesh-shaped, 1m wide in diameter and 5cm thick. Valves are arranged on the softening water inlet pipe 14 and the softening water outlet pipe 16 for convenient control and regulation.

[0032] The softened water inlet pipe 14 and the softened water outlet pipe 16 are both provided with conductivity monitors 17. The conductivity monitors 17 at the two locations constitute a conductivity monitoring device, which can determine whether to flush the electrode by monitoring the conductivity of the mine water.

[0033] Furthermore, regarding the working principle of the mine water treatment device described in this embodiment, the mine water first enters the pre-precipitation tank 1 for precipitation treatment. The precipitation time of the mine water in the pre-precipitation tank 1 is 10 minutes. The impurities are precipitated to the inverted triangle bottom of the tank, and the upper clear liquid enters the electrochemical softening device 2 through the softening water inlet pipe 14 for softening treatment. The softening time of the mine water in the electrochemical softening device 2 is 10 minutes, and the impurities in the pre-precipitation tank 1 can be cleaned by opening the inverted triangle bottom of the tank through the switch. The inlet and outlet of the mine water in the electrochemical softening device 2 is from top to bottom and then discharged from bottom to top. This method can alleviate two problems: one is that it can extend the working time of the electrochemical softening device 2, because in the conventional electrochemical softening device 2, the OH near the cathode - The highest concentration, easily reacts with Ca in water 2+ Mg 2+ The precipitate is attached to the cathode surface, which greatly reduces the working time of the device; the other is to reduce OH - The unnecessary loss of OH produced at the cathode - It is easy to react with H generated at the anode + reaction, thus forming OH - Unnecessary loss; the present invention effectively solves the above problems by changing the water inlet method. The positive electrode 12 and the negative electrode 13 in the electrochemical softening device 2 are isolated, which can improve the softening effect. The time for the mine water to be softened in the electrochemical softening device 2 is 10 minutes. The conductivity monitor 17 arranged on the softening water inlet pipe 14 and the softening water outlet pipe 16 constitutes a conductivity monitoring device, which can test the conductivity of the solution. The conductivity is determined by the ion concentration in the solution. When the scale adheres to the negative electrode 13 and has reached a point that seriously affects the treatment effect, the scaling ions in the solution cannot be removed, which will cause the conductivity value to increase. When the conductivity value reaches the predetermined value, turn off the switch to stop the water inlet and start cleaning the electrode.

[0034] Furthermore, the method for treating mine water using the mine water treatment device described in this embodiment comprises the following steps: Step 1, pre-precipitation: The mine water is powered by the first peristaltic pump 4 and enters the pre-precipitation tank 1 through the main water inlet pipe 3. Aluminum chloride (PAC) is added through the feeding tank 5 on the top of the pre-precipitation tank 1 to precipitate large particles of impurities and scale; after 10 minutes of precipitation, the valve on the softening water inlet pipe 14 is opened, and the upper clear liquid is powered by the second peristaltic pump 15 and enters the electrochemical softening device 2 through the softening water inlet pipe 14; the lower sediment enters the inverted triangle tank bottom, and the inverted triangle tank bottom is opened to clean the sediment inside.

[0035] Step 2, electrochemical softening: The pre-precipitated mine water enters the first cathode chamber 9 and the second cathode chamber 11 of the electrochemical softening device 2 respectively; the pre-precipitated mine water passes through the cathode 13, the cation exchange membrane 7, and the anode 12, and is discharged from the softening outlet pipe 16 at the top of the first anode chamber 8 and the second anode chamber 10.

[0036] Step 3, monitoring: monitor whether the conductivity of the treated mine water reaches a predetermined value. If it is below the predetermined value, it can be discharged smoothly; if the measured conductivity is greater than the predetermined value, close the valve on the softening water inlet pipe 14, and clean the cathode and anode electrodes 13, 12 and the bottom sediment.

[0037] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The phrase "includes an element defined by ..." does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mine water treatment device, characterized in that: It includes a pre-precipitation tank and an electrochemical softening device; A main water inlet pipe is arranged on the side wall of the pre-precipitation tank, and a first peristaltic pump is arranged on the main water inlet pipe; a feeding pipe is arranged on the top of the pre-precipitation tank, and a feeding tank is arranged on the top of the feeding pipe; The electrochemical softening device comprises an insulating shell, the inner cavity of which is divided into four compartments by three vertical partitions, the upper part of each vertical partition is arranged as a closed partition, and the lower part is arranged as a cation exchange membrane; the four compartments are, from left to right, a first anode chamber, a first cathode chamber, a second anode chamber, and a second cathode chamber, and the first anode chamber and the second anode chamber are both provided with a positive electrode, and the first cathode chamber and the second cathode chamber are both provided with a negative electrode; the tops of the first cathode chamber and the second cathode chamber are both connected to a softening water inlet pipe, the other end of the softening water inlet pipe is connected to the top of a pre-precipitation tank, and a second peristaltic pump is arranged on the softening water inlet pipe; the tops of the first anode chamber and the second anode chamber are both connected to a softening water outlet pipe.

2. The mine water treatment device according to claim 1, characterized in that: Conductivity monitors are provided on both the softening water inlet pipe and the softening water outlet pipe.

3. The mine water treatment device according to claim 1, characterized in that: Valves are arranged on the main water inlet pipe, the feeding pipe, the softening water inlet pipe and the softening water outlet pipe.

4. The mine water treatment device according to claim 1, characterized in that: The pre-sedimentation tank comprises a detachably connected tank body and a tank bottom, and the tank bottom adopts an inverted triangle-shaped tank bottom.

5. The mine water treatment device according to claim 1, characterized in that: Aluminum chloride is added to the feeding tank.

6. The mine water treatment device according to claim 1, characterized in that: The insulating shell comprises a detachably connected shell body and a shell bottom, wherein the shell bottom is provided with four semicircular chamber bottoms, which are respectively the chamber bottoms of a first anode chamber, a first cathode chamber, a second anode chamber and a second cathode chamber.

7. The mine water treatment device according to claim 1, characterized in that: Both the positive electrode and the negative electrode are made of ruthenium-iridium-titanium electrodes, which are mesh-shaped, 1m in diameter and 5cm in thickness.

8. The mine water treatment device according to claim 1, characterized in that: The overall dimensions of the electrochemical softening device are 5 m in length, 1 m in width and 1 m in height.

9. The mine water treatment device according to claim 1, characterized in that: The sedimentation time of mine water in the pre-sedimentation tank is 10 minutes.

10. The mine water treatment device according to claim 1, characterized in that: The time for softening mine water in the electrochemical softening device is 10 minutes.

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