Fluorine chemical production and processing wastewater treatment equipment

Abstract

The utility model relates to wastewater treatment equipment technical field especially relates to a kind of fluorine chemical production and processing wastewater treatment equipment, including container, for containing fluorine-containing wastewater;Stirring device is used to the fluorine-containing wastewater in container interior is stirred, so that fluorine-containing wastewater can be fully mixed with the precipitated solid fluorine-removal reagent of addition;Stirring device includes multiple evenly spaced circumferentially mounted in driven pulley rim edge position's stirring unit, multiple stirring units form turbulent flow when stirring fluorine-containing wastewater, the stirring paddle of stirring unit is also used to the solid particles generated by precipitated solid fluorine-removal reagent and fluorine-containing wastewater further carry out shearing crushing, by the stirring device of multiple stirring units composition jointly to the fluorine-containing wastewater in container interior is stirred, while turbulent flow and stirring paddle have higher shear force in this stirring process, so that calcium fluoride is wrapped the calcium ion carrier structure that does not carry out reaction is broken, sufficiently improve the utilization of calcium ion.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment equipment technology, and in particular to a wastewater treatment equipment for fluorochemical production and processing. Background Technology

[0002] Fluorochemical wastewater treatment equipment often uses additives to remove fluoride ions from the wastewater. For example, quicklime is added to the wastewater to react with fluoride ions, forming calcium fluoride precipitate, thus reducing the concentration of fluoride ions in the water. To ensure maximum removal of fluoride ions while minimizing the amount of quicklime used, the theoretical amount of quicklime to be added needs to be calculated based on the volume of water to be treated and the concentration of fluoride ions in the water. However, in practice, the amount of quicklime added is often much greater than the theoretical amount. The main reason is that quicklime reacts with fluoride ions in the water... During the ion reaction, the calcium fluoride precipitate formed coats the quicklime (or calcium hydroxide) to form an isolation layer, preventing calcium ions from continuously reacting with fluoride ions. Therefore, the actual dosage is often much greater than the theoretical dosage. In addition, during wastewater treatment, coagulants are usually added to accelerate the settling of calcium fluoride. Coagulants mainly work by altering the properties of colloidal particles through physicochemical action, causing them to aggregate from a dispersed state into larger flocs, thereby accelerating settling. The initial dispersion effect of the coagulant in the water also affects the settling speed and the proportion of sediment. Utility Model Content

[0003] This utility model provides a wastewater treatment device for fluorochemical production and processing. By improving the existing wastewater treatment device for fluorochemical production and processing, it uses a stirring device composed of multiple stirring units to stir the fluoride-containing wastewater inside the container. At the same time, the stirring process generates turbulence and the stirring paddle has high shear force, which breaks down the unreacted calcium ion carrier structure encapsulated by calcium fluoride, thereby fully improving the utilization rate of calcium ions.

[0004] The technical problem solved by this utility model is achieved by the following technical solution: This utility model provides a wastewater treatment device for fluorochemical production and processing, including a container for containing fluoride-containing wastewater; A stirring device is used to stir the fluoride-containing wastewater inside the container so that the fluoride-containing wastewater can be fully mixed with the added precipitated solid defluorinating agent. The stirring device includes multiple stirring units that are evenly spaced and circumferentially installed at the edge of the driven pulley. When the multiple stirring units stir the fluoride-containing wastewater, they form turbulence. The stirring paddles of the stirring units are also used to further shear and crush the solid particles generated by the precipitated solid defluorination agent and the fluoride-containing wastewater.

[0005] Preferably, a lifting rod is rotatably connected to the center of the driven pulley, the lifting rod is fixed to the container by a gantry frame, a first motor is fixedly connected to one side of the container, and a driving pulley is provided at the output end of the first motor. The driving pulley and the driven pulley are driven by a belt.

[0006] Preferably, the stirring unit includes a second motor, a rotating shaft at the output end of the second motor, and a stirring paddle on the outer surface of the rotating shaft, with the stirring paddles of two adjacent stirring units arranged alternately.

[0007] Preferably, the plurality of stirring units are divided into two groups, one group of stirring units having a high-shear-force stirring impeller, and the other group of stirring units using a low-shear-force stirring impeller.

[0008] Preferably, an aeration pipe is also provided on the inner bottom wall of the container, and the input end of the aeration pipe is connected to an air supply pump located outside the container.

[0009] Preferably, the aeration pipe is laid in a spiral shape on the inner bottom wall of the container.

[0010] The beneficial effects of this invention are: by using multiple stirring units to stir together to form turbulence and the stirring paddle having a high shear force, it can make full use of the target ion matrix that has not been fully utilized by the precipitation, thereby improving the utilization rate of the precipitated solid defluorination agent.

[0011] Compared to a single stirring unit, setting up multiple stirring units can create a multi-dimensional flow field, reducing dead zones that cannot be fully stirred. At the same time, driven by the first motor, multiple stirring units can also revolve inside the container, and their positions are constantly changing, further reducing the formation of dead zones.

[0012] By installing aeration pipes and air supply pumps, the coagulant can be fully dispersed in the wastewater through aeration when it is added, thus accelerating the sedimentation effect. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a first-person perspective view of the present invention. Figure 2 This is a perspective view of the present invention from a second perspective; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a structural diagram of the stirring device of this utility model.

[0015] In the diagram, 1. Container; 2. First motor; 3. Drive pulley; 4. Driven pulley; 5. Belt; 6. Gantry frame; 7. Lifting rod; 8. Center section; 9. Bearing; 10. Stirring unit; 11. Second motor; 12. Coupling; 13. Shaft; 14. Stirring paddle; 15. Air pump; 16. Output pipe; 17. Aeration pipe. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0017] Existing wastewater treatment equipment for fluorochemical production and processing includes a container 1 for containing fluoride-containing wastewater and a stirring device for stirring the fluoride-containing wastewater. When removing fluoride ions from the fluoride-containing wastewater, it is necessary to add a precipitating solid defluorinating agent (a solid defluorinating agent that can react with fluoride ions to form a precipitation reaction, such as calcium chloride or quicklime). Here, quicklime is used as an example of a precipitating solid defluorinating agent. When quicklime is added to water, calcium hydroxide is generated. After calcium hydroxide reacts with fluoride ions, calcium fluoride precipitates. Because the calcium fluoride precipitate may encapsulate quicklime or calcium ions that have not been fully utilized, the amount of quicklime added is often much larger than the theoretical amount. Based on this problem, this utility model adopts the following method to solve the problem.

[0018] A wastewater treatment device for fluorochemical production includes a container 1 and a stirring device. This stirring device differs from existing stirring devices in that: firstly, it consists of multiple stirring units 10; secondly, each stirring unit 10 has a stirring paddle 14 with high shear force (generally having a sharp blade, resulting in high shear force during high-speed rotation). During the stirring process, the multiple stirring units 10 cover a larger stirring area. Simultaneously, each stirring unit 10 forms a vortex, and the interaction between corresponding vortices creates turbulence. The turbulence causes the calcium fluoride precipitates to collide with each other or further break down the precipitates, exposing unutilized calcium ions and thus ensuring full utilization of calcium ions, reducing the amount of quicklime required. Furthermore, the high shear force of the stirring paddle 14 further pulverizes the calcium fluoride precipitates, exposing unutilized calcium ions and further reducing the amount of quicklime required.

[0019] Furthermore, the design of the aforementioned multiple stirring units 10 can also reduce the occurrence of stirring dead zones inside the container 1 (dead zones represent locations where turbulence does not occur or where the material is sheared by the stirring slurry; that is, although some sediment moves with the water flow under the action of stirring, it cannot be sheared or further crushed by turbulence). To further reduce the possibility of dead zones, multiple stirring units 10 are evenly spaced and circumferentially installed at the edge of the driven pulley 4. The driven pulley 4 is stabilized in position by the hanger 7 on the gantry 6. The center 8 of the driven pulley 4 is rotatably connected to the hanger 7 (specifically, it can be rotatably connected by the bearing 9 as shown in the attached figure). A first motor 2 is fixedly connected to one side of the container 1. The output end of the first motor 2 is fixedly connected to the driving pulley 3. The driving pulley 3 and the driven pulley 4 are driven by a belt 5. Specifically, during the stirring process, the rotational power of the first motor 2 is converted into the power of multiple stirring units 10 revolving (i.e., rotating around the axis of the driven pulley 4) through the driving pulley 3, belt 5, and driven pulley 4.

[0020] Furthermore, the stirring unit 10 includes a second motor 11, a rotating shaft 12 located at the output end of the second motor 11, and a stirring paddle 14 located on the outer surface of the rotating shaft 12. The stirring paddles 14 of two adjacent stirring units 10 are staggered. When each stirring unit 10 stirs the fluoride-containing wastewater, it is driven by its own second motor 11. Thus, each stirring unit 10 can have different speeds and different rotation directions when working, thereby enabling the stirring device to have multiple stirring modes. During the stirring process, different stirring modes can form turbulence at different positions, achieving further crushing of the precipitate.

[0021] Furthermore, the multiple stirring units 10 are divided into two groups. One group of stirring units 10 has a high-shear stirring paddle 14 (with a relatively sharp edge), and the other group of stirring units 10 uses a low-shear stirring paddle 14 (with a relatively blunt edge). As shown in the attached figure, three of the six stirring units 10 arranged at intervals use a low-shear stirring paddle 14, and the other three are arranged at intervals using a high-shear stirring unit 10. In the initial stage of stirring, in order to ensure that the limestone can be evenly dispersed in the fluoride-containing wastewater, the three high-shear stirring paddles 14 are operated to stir the fluoride-containing wastewater and further break down the generated calcium fluoride precipitate, so that the calcium ions in the fluoride-containing wastewater can be fully utilized. This embodiment is also suitable for the treatment of wastewater with low fluoride concentration. In the later stages of wastewater treatment, since the generated calcium fluoride needs to settle to the bottom quickly, flocculants (such as ferric chloride, polyacrylamide, and polyaluminum chloride) need to be added to the container 1. In order to avoid the high-shear force agitator 14 damaging the generated flocs, after adding the flocculant, the agitator unit 10 with a low-shear force agitator 14 needs to be used to agitate the fluoride-containing wastewater to ensure that the flocculant is fully mixed in the fluoride-containing wastewater, while avoiding the generated flocs being sheared and broken, which would affect the sedimentation effect. The alternating operation of the agitator unit 10 with high and low shear force can achieve the effect of energy saving.

[0022] Of course, the stirring unit 10 provided in the attached diagram can also be a stirring unit 10 with a high shear force stirring paddle 14, which is used in conjunction with an aeration device. That is, during the process of adding quicklime, multiple stirring units 10 work together to stir. Since each stirring unit 10 has a high shear force stirring paddle 14, it can not only make the quicklime and fluoride-containing wastewater fully mixed, but also further break down the generated calcium fluoride precipitate, so that the calcium ions in the fluoride-containing wastewater can be fully utilized. After the reaction is completed, the stirring device stops working, and flocculant is added so that the generated calcium fluoride precipitate can settle quickly. In the initial stage of adding flocculant... When the aeration device is in operation, the air supply pump 15 draws air and delivers it to the aeration pipe 17 through the output pipe 16 at its output end. The aeration pipe 17 is located at the bottom of the container 1. The airflow rises and disperses in the fluoride-containing wastewater, allowing the flocculant and calcium fluoride precipitate in the fluoride-containing wastewater to be fully and evenly mixed. The generated flocs quickly adsorb the calcium fluoride precipitate, causing it to settle rapidly. Using the airflow generated by aeration to mix the fluoride-containing wastewater and flocculant can avoid damaging the flocs, and the airflow can carry large flocs to move in the wastewater of the container 1, fully adsorbing the calcium fluoride precipitate. When the air supply pump 15 stops operating, the large flocs adsorbed with calcium fluoride can settle rapidly.

[0023] To ensure that the flocculant can quickly disperse into the fluoride-containing wastewater during the aeration process in container 1, the aeration pipe 17 is laid in a vortex shape at the bottom of container 1 to achieve full coverage of the fluoride-containing wastewater in container 1.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above-described embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A wastewater treatment device for fluorochemical production and processing, comprising: Container (1) is used to contain fluoride-containing wastewater; A stirring device is used to stir the fluoride-containing wastewater inside the container (1) so that the fluoride-containing wastewater can be fully mixed with the added precipitated solid defluorinating agent. Its features are, The stirring device includes multiple stirring units (10) that are evenly spaced and circumferentially installed at the edge of the driven pulley (4). The multiple stirring units (10) form turbulence when stirring the fluoride-containing wastewater. The stirring paddle (14) of the stirring unit (10) is also used to further shear and crush the solid particles generated by the precipitated solid defluorination agent and the fluoride-containing wastewater.

2. The wastewater treatment equipment for fluorochemical production and processing according to claim 1, characterized in that, The driven pulley (4) is rotatably connected to a boom (7) at its center. The boom (7) is fixed to the container (1) by a gantry frame (6). A first motor (2) is fixedly connected to one side of the container (1). A drive pulley (3) is provided at the output end of the first motor (2). The drive pulley (3) and the driven pulley (4) are driven by a belt (5).

3. The wastewater treatment equipment for fluorochemical production and processing according to claim 1, characterized in that, The stirring unit (10) includes a second motor (11), a rotating shaft (12) at the output end of the second motor (11), and a stirring paddle (14) on the outer surface of the rotating shaft (12). The stirring paddles (14) of two adjacent stirring units (10) are staggered.

4. The wastewater treatment equipment for fluorochemical production and processing according to claim 1, characterized in that, The multiple stirring units (10) are divided into two groups, one group of stirring units (10) having a high shear force stirring paddle (14) and the other group of stirring units (10) using a low shear force stirring paddle (14).

5. The wastewater treatment equipment for fluorochemical production and processing according to claim 1, characterized in that, An aeration pipe (17) is also provided on the inner bottom wall of the container (1), and the input end of the aeration pipe (17) is connected to an air supply pump (15) located outside the container (1).

6. The wastewater treatment equipment for fluorochemical production and processing according to claim 5, characterized in that, The aeration pipe (17) is laid in a spiral shape on the inner bottom wall of the container (1).

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