A washing and separating device for pseudo-boehmite production

Abstract

The utility model belongs to the production equipment field of pseudo-boehmite, especially relates to a kind of washing and separating device for pseudo-boehmite production. Including plate-and-frame filter press and heavy suspension tank, wherein, the heavy suspension tank includes tank body and the feed inlet being set in the top of tank body, the top of tank body is also provided with premixing tank, the premixing tank includes auxiliary tank body and the rotating shaft being set in auxiliary tank body, the rotating shaft is through tank body and is connected with driving motor, the side of driving motor is provided with feed pipe, the feed pipe is communicated with the setting in auxiliary tank body, spiral blade, crushing rod are successively installed on the rotating shaft from top to bottom, the utility model is improved to the structure of heavy suspension tank, premixing of part filter cake is realized by the setting of premixing tank, reduce the mixing amount in tank body, to reach the purpose of improving mixing efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of boehmite production equipment, and particularly relates to a washing and separation device for boehmite production. Background Technology

[0002] Boehmite is an amorphous or weakly crystalline structure, exhibiting a wrinkled, lamellae morphology. Compared to fully crystalline boehmite, it has lower crystallinity and smaller grain size (typically less than 10 nm). Its crystal structure contains a large amount of interlayer water and surface-adsorbed water, giving it thixotropic gel properties. Due to its high specific surface area, controllable pore volume (0.4~1.0 mL / g), excellent colloidal solubility, thermal stability, and weakly crystalline structure, boehmite has irreplaceable applications in petrochemicals, environmental protection, new energy, high-end materials, and biomedicine.

[0003] The existing washing and separation processes for pseudoboehmite are mainly divided into continuous production and intermittent production based on the continuity of operation. Continuous production uses a "multi-stage countercurrent washing tower" or a "belt filter + countercurrent spray system" to achieve integrated washing and filtration. Intermittent production uses a "plate and frame filter press + resuspension tank" to re-filter after each stage of washing to ensure that the washing liquid and filter cake are in full contact.

[0004] Because plate and frame filter presses are involved in other processes, the combination of a plate and frame filter press and a resuspension tank has become a common setup for existing pseudo-boehmite washing and separation processes. In this combination, the plate and frame filter press performs a dual function of "solid-liquid separation + filter cake dewatering"—by applying pressure (0.6-2.0 MPa), the liquid in the slurry passes through the filter cloth, trapping solid particles to form a filter cake, while simultaneously achieving contact penetration between the washing liquid and the filter cake during the washing stage. The resuspension tank, on the other hand, performs the function of "filter cake dispersing + impurity desorption"—by mixing the filtered filter cake with fresh / recycled washing liquid, the "bridging structure" and particle agglomerates of the filter cake are broken down through stirring, allowing impurity ions (such as Na+) encapsulated within to be removed. + SO4 2- It is released into the solution to prepare for the next filtration and impurity removal.

[0005] Existing heavy suspension tanks mainly consist of a tank body and a crushing rod that rotates inside the tank body to break up and mix the filter cake. Due to the large amount of filter cake, the existing mixing time is relatively long. Therefore, how to effectively improve the mixing efficiency is the direction that needs to be improved. Utility Model Content

[0006] This invention addresses the technical problems existing in the plate and frame filter press and gravity suspension tank used for washing and separating pseudoboehmite, and proposes a washing and separation device for pseudoboehmite production that is reasonably designed, simple in structure, easy to process, and can effectively improve mixing efficiency.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a washing and separation device for the production of pseudo-boehmite, including a plate and frame filter press and a resuspension tank. The resuspension tank includes a tank body and a feed inlet located at the top of the tank body. A premixing tank is also provided at the top of the tank body. The premixing tank includes an auxiliary tank body and a rotating shaft located within the auxiliary tank body. The rotating shaft passes through the tank body and is connected to a drive motor. A feed pipe is provided on one side of the drive motor and is connected to the auxiliary tank body. A spiral blade and a crushing rod are sequentially mounted on the rotating shaft from top to bottom. At least five spiral blades are provided. A washing liquid nozzle is also provided within the auxiliary tank body.

[0008] Preferably, the crushing rod includes an upper crushing rod, a middle crushing rod, and a lower crushing rod.

[0009] Preferably, the length of the middle layer crushing rod is shorter than that of the upper layer crushing rod and the lower layer crushing rod.

[0010] Preferably, the washing liquid nozzles are evenly distributed in a ring shape within the auxiliary tank.

[0011] Preferably, the washing liquid nozzle is positioned close to the middle layer crushing rod.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This utility model provides a washing and separation device for the production of pseudo-boehmite. By improving the structure of the resuspension tank and using the setting of a premixing tank, a portion of the filter cake is premixed, reducing the mixing volume in the tank and thus improving the mixing efficiency. At the same time, the solution provided by this utility model can be improved on the existing basis and is suitable for large-scale promotion and use. Attached Figure Description

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

[0014] Figure 1 This is a schematic diagram of the washing and separation device for producing boehmite provided in Example 1; Figure 2This is a schematic diagram of the structure of the weight suspension tank provided in Example 1; Figure 3 A schematic diagram of the structure of the helical blade provided in Example 1; In the above figures, 1 is a plate and frame filter press; 2 is a resuspension tank; 21 is a feed inlet; 3 is a premixing tank; 31 is a rotating shaft; 32 is a drive motor; 33 is a feed pipe; 34 is a discharge pipe; 35 is a spiral blade; 36 is an upper crushing rod; 37 is a middle crushing rod; 38 is a lower crushing rod; and 39 is a washing liquid nozzle. Detailed Implementation

[0015] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0016] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0017] Example 1, such as Figures 1-3 As shown, this embodiment aims to improve the mixing efficiency of the resuspension tank 2. To achieve this objective, the washing and separation device for producing boehmite provided in this embodiment includes a plate and frame filter press 1 and a resuspension tank 2. This is a commonly used device in existing intermittent washing and separation processes. In this embodiment, no improvements are made to the plate and frame filter press 1, so it will not be described in detail.

[0018] The resuspension tank 2 provided in this embodiment is the same as the existing ones, including a tank body and a feed inlet 21 set at the top of the tank body. Of course, there is also a stirring component set inside it. Considering that the main problem of low stirring efficiency is that the filter cake is insoluble and the entire mixed liquid medium is large, the stirring cycle is long. Therefore, in this embodiment, a premixing tank 3 is also set at the top of the tank body. Specifically, the premixing tank 3 includes an auxiliary tank body and a rotating shaft 31 set in the auxiliary tank body. The rotating shaft 31 passes through the tank body and is connected to a drive motor 32. A feed pipe 33 is set on one side of the drive motor 32. The feed pipe 33 is connected to the auxiliary tank body. A discharge pipe 34 is set at the bottom of the auxiliary tank body. The discharge pipe 34 is connected to the tank body and no valve is set on the discharge pipe 34 for sealing. In this way, the filter cake entering from the feed pipe 33 falls directly.

[0019] Therefore, it is necessary to delay, crush, and mix the directly falling filter cake. To achieve this, spiral blades 35 and a crushing rod are sequentially mounted on the rotating shaft 31 from top to bottom. At least five spiral blades 35 are provided; in this embodiment, six spiral blades 35 are used. The multiple spiral blades 35 reduce the vertical gap, effectively achieving the delay effect. The twisted structure of the spiral blades 35 also creates a horizontal discharge gap, ensuring material leakage. Thus, by utilizing the delay and crushing effects of the spiral blades 35 and the crushing action of the crushing rod, combined with the crushing action of the suspension tank 2 body, the crushing efficiency of the filter cake is effectively improved. To further improve the mixing efficiency, a washing liquid nozzle 39 is also provided in the auxiliary tank. Therefore, the premixing tank 3 not only assists in crushing but also plays a mixing role, thereby improving the mixing efficiency.

[0020] In practice, a screw conveyor is used to feed materials to both the tank and the premixing tank 3 simultaneously. This improves efficiency compared to the previous method, which was less efficient if only the premixing tank 3 was fed.

[0021] To maximize crushing efficiency, in this embodiment, the crushing rod includes an upper crushing rod 36, a middle crushing rod 37, and a lower crushing rod 38. The middle crushing rod 37 is shorter than the upper crushing rod 36 and the lower crushing rod 38. In this embodiment, the lower crushing rod 38, the middle crushing rod 37, and the lower crushing rod 38 are all arranged in a rectangular parallelepiped shape, and their edges crush the filter cake. This reasonable ratio of long and short rods also ensures that the rotating shaft 31 maintains good dynamic balance during high-speed rotation.

[0022] Meanwhile, to improve the mixing effect, the washing liquid nozzles 39 are evenly distributed in a ring shape within the auxiliary tank. The washing liquid nozzles 39 are positioned close to the middle layer crushing rod 37. The washing liquid nozzles 39 are positioned at the middle layer crushing rod 37 mainly because the filter cake at the middle layer crushing rod 37 is basically in a crushed state, and there is more space, which is conducive to the dispersion of the washing liquid.

[0023] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A washing and separation device for producing boehmite, comprising a plate and frame filter press and a resuspension tank, wherein, The suspension tank includes a tank body and a feed inlet located at the top of the tank body. The tank body is characterized by further including a premixing tank at the top. The premixing tank includes an auxiliary tank body and a rotating shaft located within the auxiliary tank body. The rotating shaft passes through the tank body and is connected to a drive motor. A feed pipe is located on one side of the drive motor and communicates with the auxiliary tank body. A spiral blade and a crushing rod are sequentially mounted on the rotating shaft from top to bottom. At least five spiral blades are provided. A washing liquid spray nozzle is also located within the auxiliary tank body.

2. The washing and separation device for producing boehmite according to claim 1, characterized in that, The crushing rod includes an upper crushing rod, a middle crushing rod, and a lower crushing rod.

3. The washing and separation device for producing boehmite according to claim 2, characterized in that, The length of the middle layer crushing rod is shorter than that of the upper layer crushing rod and the lower layer crushing rod.

4. The washing and separation device for producing boehmite according to claim 3, characterized in that, The washing liquid nozzles are evenly distributed in a ring shape within the auxiliary tank.

5. The washing and separation device for producing boehmite according to claim 4, characterized in that, The washing liquid nozzle is positioned near the middle layer crushing rod.

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