Pre-oxidation integrated treatment equipment for removing heavy metals in mine gushing water

Abstract

The utility model belongs to the technical field of mine gushing water treatment, and relates to pre-oxidation integrated treatment equipment for removing heavy metals in mine gushing water. Comprising a pre-oxidation bin, a metal alkali environment precipitation reaction unit, a flocculation mixing reaction tank and a plate type filler precipitation unit, the flocculation mixing reaction tank comprises a first flocculation mixing reaction unit and a second flocculation mixing reaction unit, and an oxygen supply ring pipe and an oxygen releaser are arranged at the bottom of the pre-oxidation bin; a matched dosing device is integrated on the side wall of the treatment tank, and the dosing device comprises an alkali liquor dosing system, a PAC dosing system and a PAM dosing system; stirrers are arranged in the metal alkali environment precipitation reaction unit, the first flocculation mixing reaction unit and the second flocculation mixing reaction unit; pre-oxidation treatment is carried out before alkaline precipitation reaction and coagulation-flocculation reaction, so that valence of metal ions in the mine inflow water is increased, and then alkaline precipitation reaction is carried out on the metal ions, so that the removal rate of the metal ions and the stability of precipitates can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of mine water treatment technology, and in particular relates to an integrated pre-oxidation treatment device for removing heavy metals from mine water. Background Technology

[0002] Coal mining enterprises generate a large amount of mine water during the mining process. Mine water is characterized by high suspended solids content, high salinity, and the presence of heavy metals, with the salinity mainly consisting of calcium. 2+ Mg 2+ Na + K + SO4 2- HCO3 - Cl - F - The primary precipitate is plasma, with heavy metals mainly consisting of iron and manganese. In practical engineering, due to the high suspended solids in mine water, direct alkaline precipitation and coagulation reactions often affect the removal efficiency of metal ions. Lower valence metal ion precipitates are more easily reduced; for example, ferrous and manganese ions are oxidized to higher valence states, such as ferrous ions being oxidized to ferric ions, thus improving the precipitation ability and stability of metal ions and preventing the formation of unstable precipitates.

[0003] Therefore, this application proposes an integrated pre-oxidation treatment device for removing heavy metals from mine water. Utility Model Content

[0004] This invention proposes an integrated pre-oxidation treatment device for removing heavy metals from mine water. Before alkaline precipitation and coagulation reactions, pre-oxidation treatment should be carried out to increase the valence of metal ions in the mine water. Then, alkaline precipitation can be performed to improve the removal rate of metal ions and the stability of the precipitate.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An integrated pre-oxidation treatment device for removing heavy metals from mine water includes a one-piece treatment tank, which is divided into a pre-oxidation chamber, a metal alkaline environment precipitation reaction unit, a flocculation mixing reaction tank, and a plate-type packing sedimentation unit. The flocculation mixing reaction tank includes a first flocculation mixing reaction unit and a second flocculation mixing reaction unit.

[0007] The bottom of the pre-oxidation chamber is equipped with an oxygen supply loop and an oxygen release device;

[0008] The sidewall of the treatment tank is equipped with integrated dosing devices, which include an alkaline dosing system, a PAC dosing system, and a PAM dosing system.

[0009] A stirrer is installed in the metal alkaline environment precipitation reaction unit, the first flocculation mixing reaction unit, and the second flocculation mixing reaction unit.

[0010] Furthermore, the oxygen release device has a tubular structure and is evenly distributed on the oxygen supply loop, through which oxygen is supplied to the oxygen release device.

[0011] Furthermore, an inspection ladder is installed on the side wall of the plate-type packing sedimentation unit.

[0012] Furthermore, a pH meter is installed in the metal alkaline environment precipitation reaction unit, and the pH meter, dosing device and agitator are all connected to the control system.

[0013] This utility model has the following advantages:

[0014] This utility model's integrated pre-oxidation treatment equipment adopts a steel anti-corrosion integrated skid-mounted structure, which has the advantages of small footprint, convenient installation, and stable operation. Meanwhile, all reaction units and dosing devices inside the equipment are automatically controlled, and can be automatically adjusted and operated according to actual working conditions, improving the equipment's processing efficiency and stability.

[0015] Pre-oxidation treatment should be carried out before alkaline precipitation and coagulation / flocculation reactions to increase the valence of metal ions in the mine water. Then, alkaline precipitation can improve the removal rate of metal ions and the stability of the precipitate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the planar structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the elevation structure of this utility model;

[0018] In the diagram, 1-Pre-oxidation chamber; 2-Metal alkaline environment precipitation reaction unit; 3-First flocculation mixing reaction unit; 4-Second flocculation mixing reaction unit; 5-Plate packing precipitation unit; 6-Alkali dosing system; 7-PAC dosing system; 8-PAM dosing system; 9-Agitator; 10-Control system; 11-Oxygen release device; 12-Oxygen supply loop pipe; 13-Maintenance ladder. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, a further detailed description of this utility model will be provided below in conjunction with the accompanying drawings. It is hereby declared that the directional terms such as up, down, left, right, front, back, inside, and outside that appear or will appear in this document are based solely on the accompanying drawings and are not intended to specifically limit this utility model.

[0020] Example

[0021] An integrated pre-oxidation treatment device for removing heavy metals from mine water includes a one-piece treatment tank, which is divided into a pre-oxidation chamber 1, a metal alkaline environment precipitation reaction unit 2, a flocculation mixing reaction tank, and a plate-type packing sedimentation unit 5. The flocculation mixing reaction tank includes a first flocculation mixing reaction unit 3 and a second flocculation mixing reaction unit 4.

[0022] The pre-oxidation chamber 1 is equipped with an oxygen supply loop 12 and an oxygen release device 11 at its bottom. The oxygen release device 11 is a tubular structure and is evenly distributed on the oxygen supply loop 12. Oxygen is supplied to the oxygen release device 11 through the oxygen supply loop 12, causing the low-valence metal ions in the mine inflow to undergo a pre-oxidation reaction, increasing the valence state of the metal ions and providing favorable conditions for subsequent precipitation reactions. At the same time, the design of the oxygen supply loop 12 and the oxygen release device 11 ensures that oxygen can be fully dissolved in the mine inflow, improving oxidation efficiency. In addition, the pre-oxidation chamber 1 is also equipped with composite catalytic packing. Since the oxygen release device 11 is located at the bottom of the equipment, as the reaction proceeds and the sample volatilizes, the oxygen concentration in the wastewater gradually decreases from the bottom to the surface. If the water flow rate is too fast, the wastewater will enter a low-oxygen zone before complete oxidation. Therefore, based on the distribution structure of oxygen concentration in the water, catalytic packing is installed in the upper part of the pre-oxidation chamber 1. The catalytic effect of the packing accelerates the metal oxidation rate under oxygen loss conditions, further improving the pre-oxidation effect. Simultaneously, it can also oxidize some organic pollutants in the water, reducing the COD content in the water.

[0023] The treatment tank is equipped with integrated dosing devices on its sidewalls, including an alkali dosing system 6, a PAC dosing system 7, and a PAM dosing system 8. Within this unit, alkali is added to induce precipitation of metal ions in the mine water under alkaline conditions. The alkali dosage is monitored and controlled in real-time by a pH meter to ensure the pH remains within the suitable range for metal precipitation. Simultaneously, the PAC (polyaluminum chloride) and PAM (polyacrylamide) dosing systems add coagulants and flocculants to the reaction unit, respectively, promoting the formation of metal ion precipitates and flocs. After the precipitation reaction is complete, the mine water enters the flocculation and coagulation reaction tank.

[0024] A stirrer 9 is installed in the metal alkaline environment precipitation reaction unit 2, the first flocculation mixing reaction unit 3, and the second flocculation mixing reaction unit 4 to increase the mixing uniformity.

[0025] The plate-type packed sedimentation unit 5 is equipped with an inspection ladder 13 on its side wall for easy maintenance.

[0026] The metal alkaline environment precipitation reaction unit 2 is equipped with a pH meter. The pH meter, dosing device and stirrer 9 are all connected to the control system 10. The pH meter, dosing device, stirrer 9 and control system 10 are all purchased from the existing market, and their internal structure and circuit connection relationship are known in the art.

[0027] The working process of this utility model:

[0028] Mine water is first pumped to pre-oxidation chamber 1 by a booster pump. In pre-oxidation chamber 1, a pre-oxidation reaction occurs to increase the valence of metals in the mine water. After pre-oxidation, the mine water flows into metal alkaline environment precipitation reaction unit 2. In this unit, alkali solution is added, causing metal ions in the mine water to precipitate in an alkaline environment. The amount of alkali added is monitored and controlled in real time by a pH meter to ensure the pH range is within the suitable range for metal precipitation. Simultaneously, PAC dosing system 7 and PAM dosing system 8 add coagulants and flocculants to the reaction unit, respectively, to promote the formation of metal ion precipitates and flocs. After the precipitation reaction is complete, the mine water enters flocculation and coagulation reaction units 3 and 4. In these two units, further coagulation and flocculation cause suspended solids and precipitates to form larger particles, facilitating subsequent sedimentation and separation. Simultaneously, the agitation action of the stirrer ensures that the coagulants and flocculants are thoroughly mixed with the mine water, improving the coagulation and flocculation effect. Finally, the mine water, after undergoing flocculation and coagulation, enters the plate-type packing sedimentation unit 5. In this unit, by installing plate packing, sedimentation occurs as the mine water flows through it, separating suspended solids and precipitates. Simultaneously, the plate packing also increases the residence time of the mine water, improving the sedimentation effect.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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. An integrated pre-oxidation treatment device for removing heavy metals from mine water, characterized in that: It includes an integrally formed treatment tank, which is divided into a pre-oxidation chamber (1), a metal alkali environment precipitation reaction unit (2), a flocculation mixing reaction tank and a plate packing precipitation unit (5). The flocculation mixing reaction tank includes a first flocculation mixing reaction unit (3) and a second flocculation mixing reaction unit (4). The bottom of the pre-oxidation chamber (1) is equipped with an oxygen supply loop pipe (12) and an oxygen release device (11). The sidewall of the treatment tank is equipped with a dosing device, which includes an alkaline dosing system (6), a PAC dosing system (7), and a PAM dosing system (8); a mixer (9) is installed in the metal alkaline environment precipitation reaction unit (2), the first flocculation mixing reaction unit (3), and the second flocculation mixing reaction unit (4).

2. The integrated pre-oxidation treatment equipment for removing heavy metals from mine water according to claim 1, characterized in that: The oxygen release device (11) has a tubular structure and is evenly distributed on the oxygen supply ring pipe (12), through which oxygen is supplied to the oxygen release device (11).

3. The integrated pre-oxidation treatment equipment for removing heavy metals from mine water according to claim 1, characterized in that: A maintenance ladder (13) is provided on the side wall of the plate-type packed sedimentation unit (5).

4. The integrated pre-oxidation treatment equipment for removing heavy metals from mine water according to claim 1, characterized in that: The metal alkaline environment precipitation reaction unit (2) is equipped with a pH meter. The pH meter, dosing device and stirrer (9) are all connected to the control system (10).

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