A dust suppression and recovery device for a sizing tank when dry powder is added

Abstract

This utility model discloses a dust suppression and recovery device for adding dry powder materials to a slurry mixing tank, relating to the technical field of slurry production equipment. It aims to solve the problems of dust dispersion, material loss, and water waste when dry powder materials are added to the slurry mixing tank. The device includes a slurry mixing tank body and a feeding hopper installed at its inlet. Upper and lower spray pipes are symmetrically arranged on the inner walls of the left and right sides of the feeding hopper. Each spray pipe has two rows of spray holes. One row of spray holes on the upper spray pipe is vertically downward, and the other row is inclined inward and downward at 60°. One row of spray holes on the lower spray pipe is vertically downward, and the other row is inclined inward and downward at 45°. The spray pipes are connected to a water inlet pipe. This utility model constructs a "water mist surrounding net" through double-layer, double-sided directional spraying, achieving a dust suppression rate of 99%. Dust falls into the slurry mixing tank with the spray water, achieving material recovery. Simultaneously, the spray water is recycled as bottom water for slurry mixing. The structure is simple, easy to maintain, and meets environmental protection and energy-saving requirements.

Description

Technical Field

[0001] This utility model belongs to the technical field of slurry preparation equipment in rare earth smelting and separation, and relates to a dust suppression and recovery device for adding dry powder materials to the slurry preparation tank. Background Technology

[0002] In the pulping process of industries such as textiles, papermaking, and coatings, dry powder materials such as starch, talc, and pigment powder need to be added to the pulping tank. Current methods mostly involve directly pouring the dry powder from the inlet of the pulping tank, which presents several significant problems. Similarly, in the rare earth smelting and separation field, roasted rare earth concentrate, as a key raw material, needs to be added to the reaction vessel before subsequent leaching and purification processes. Current methods also primarily involve direct pouring, which faces similar but more unique problems, as follows:

[0003] 1. Severe Dust Pollution: During slurry preparation, the dry powder comes into intense contact with the air as it falls, generating a large amount of dust that escapes from the feed inlet, leading to deterioration of workshop air quality and endangering the health of operators. In the rare earth smelting and separation field, the roasted rare earth concentrate is in the form of fine powder with high fluidity; direct dumping results in a wider dust diffusion range and higher concentration. This rare earth dust not only pollutes the workshop air, but some rare earth elements may also cause specific hazards to the respiratory system and skin of operators, and long-term exposure can seriously affect their health.

[0004] 2. High Material Loss Rate: During slurry preparation, the flying dust is difficult to recover, resulting in raw material waste and increased production costs. For rare earth smelting and separation, the value of roasted rare earth concentrate is far higher than that of ordinary slurry materials. Direct dumping leads to dust loss, resulting in the waste of valuable rare earth raw materials, significantly increasing the raw material costs of production enterprises and reducing product profit margins. Moreover, rare earth resources are strategic and scarce resources, and material loss does not meet the requirements of efficient resource utilization.

[0005] 3. Significant Environmental Risks: During the slurry preparation process, dust leaks may occur, failing to meet environmental regulations such as the "Integrated Emission Standard for Air Pollutants," potentially leading to environmental penalties. In the rare earth smelting and separation sector, in addition to complying with general air pollutant emission standards, some regions have also formulated stricter local environmental standards specifically for the rare earth industry. The leakage of rare earth concentrate dust after roasting not only faces hefty environmental penalties for exceeding emission standards but may also cause potential pollution to surrounding soil, water bodies, and other ecological environments, triggering serious environmental problems and public pressure.

[0006] 4. Water Waste: In slurry preparation, some enterprises use top spraying for dust suppression. However, the sprayed water cannot be recycled, requiring additional water consumption, and the wastewater needs separate treatment, increasing environmental costs. In the rare earth smelting and separation process, if top spraying is used to treat the dust from roasted rare earth concentrate, on the one hand, rare earth smelting itself has a large demand for water resources, and spraying will further exacerbate the water shortage and increase water consumption costs; on the other hand, after the sprayed water comes into contact with rare earth dust, it will form wastewater containing rare earth elements. This type of wastewater has a complex composition and is much more difficult to treat than ordinary slurry preparation spray wastewater, requiring more investment in funds and technology for specialized treatment, further increasing the environmental costs and operational burden of enterprises.

[0007] Therefore, in order to solve the above-mentioned technical problems, the technical solution of this application is proposed. Utility Model Content

[0008] The purpose of this utility model is to overcome the defects of existing dry powder feeding devices for slurry mixing tanks and provide a dust suppression and recovery device for dry powder feeding in slurry mixing tanks to solve the problems of dust flying, material loss, failure to meet environmental protection standards and waste of water resources.

[0009] The technical solution adopted in this utility model is as follows:

[0010] A dust suppression and recovery device for adding dry powder to a slurry mixing tank includes a slurry mixing tank body, a feeding hopper, a spray pipe assembly, a spray hole structure, and a water inlet pipe.

[0011] The mixing tank body is equipped with a feeding port at the top;

[0012] Feeding hopper: The feeding hopper has a funnel-shaped structure. Its lower port is sealed to the feed inlet of the mixing tank body, and its upper port is the dry powder feeding inlet. Spray pipe assemblies are symmetrically arranged on the inner walls of the left and right sides of the feeding hopper.

[0013] Spray pipe assembly: Each spray pipe assembly includes one upper spray pipe and one lower spray pipe; the upper spray pipe is fixed to the upper part of the feeding hopper (at 1 / 3 of the height from the upper port), and the lower spray pipe is fixed to the lower part of the feeding hopper (at 1 / 3 of the height from the lower port, close to the feed inlet of the mixing tank body).

[0014] Spray hole structure: Each upper spray pipe and each lower spray pipe has two rows of spray holes evenly distributed along the length of the pipe; one row is vertically downward spray holes (the axis is perpendicular to the horizontal plane), and the other row is directional inclined spray holes; the directional inclined spray holes of the upper spray pipe form a 60° angle with the axis of the upper spray pipe and spray inward and downward, and the directional inclined spray holes of the lower spray pipe form a 45° angle with the axis of the lower spray pipe and spray inward and downward.

[0015] Water inlet pipeline: The water inlet pipeline includes a main water inlet pipe, branch pipes and control components; one end of the main water inlet pipe is connected to the water source, and the other end is connected to four spray pipes (the upper spray pipes on the left and right sides and the lower spray pipes on the left and right sides) through the branch pipes; the control components include pressure gauges, shut-off valves and flow meters, all of which are installed on the main water inlet pipe.

[0016] The working principle of this utility model is as follows: Preparation stage: Open the shut-off valve of the water inlet pipe, and adjust the spray water pressure (0.3-0.4MPa) and flow rate (1.5-1.8L / min) through the pressure gauge and flow meter so that the spray holes of the four spray pipes can form a stable water mist.

[0017] Feeding stage: The dry powder material from the rotary kiln enters directly into the upper end of the feeding hopper, and falls along the inner wall of the feeding hopper.

[0018] The vertical downward spray holes of the upper spray pipe form a "top-mounted water curtain", which initially blocks the upward diffusion of dust; at the same time, the 60° inclined directional spray holes form a "centripetal cross water mist", which accurately captures the dust raised when the dry powder initially falls.

[0019] The vertical downward spray holes of the lower spray pipe cover the area where the material falls rapidly, and the 45° inclined directional spray holes form a "tank mouth protective water mist" to suppress the secondary dust generated when the material approaches the feed inlet and prevent dust from escaping from the connection between the feed inlet and the feeding hopper.

[0020] Recovery and recycling stage: The dust captured by the water mist forms a "dust-water mixture", which falls into the mixing tank along with the dry powder through the lower port of the feeding hopper. This achieves 100% material recovery and allows the spray water to directly participate in the mixing process as the bottom water required for mixing, without the need for additional discharge or treatment.

[0021] Furthermore, the feeding hopper is made of 304 stainless steel or galvanized Q235 carbon steel. This design provides excellent corrosion resistance (suitable for acidic or alkaline materials or humid environments encountered during slurry preparation), preventing dust adsorption and material contamination caused by internal wall rust after long-term use, thus extending the equipment's lifespan. On the other hand, galvanized Q235 carbon steel reduces costs while maintaining rust prevention, catering to the budget needs of different companies. Simultaneously, the flange connection + oil-resistant rubber sealing ring design completely seals the gap between the lower port of the feeding hopper and the inlet of the slurry tank, avoiding dust leakage problems common with traditional bolt connections. The flange structure also facilitates disassembly and maintenance of the feeding hopper (such as cleaning residual materials from the inner wall and maintaining the spray pipes), balancing sealing performance with ease of maintenance.

[0022] Furthermore, the two upper spray pipes are positioned at different heights to effectively cover the initial dust-generating zone (10-20cm below the feeding port, where dust is most likely to rise) where the dry powder initially falls. The lower spray pipe covers the secondary dust zone (near the tank opening, where material impacts the airflow and easily generates secondary dust), avoiding dust suppression dead zones caused by spray pipe misalignment. The "welding or flange connection" fixing method satisfies the needs of different usage scenarios (welding is suitable for long-term stable operation without disassembly requirements; flange connection is suitable for scenarios requiring periodic spray pipe replacement, such as when handling highly abrasive materials), while ensuring the spray pipes do not loosen under water pressure, maintaining a stable spray angle and preventing water mist deviation and reduced dust suppression effect due to pipe vibration.

[0023] Furthermore: For fine-particle powders (such as 200-mesh roasted rare earth concentrate), a small aperture of 1.5-2mm is selected to form a finer water mist and improve dust capture rate; for coarse-particle powders (such as 50-mesh starch), a small aperture of 2-2.5mm is selected to avoid powder particles clogging the spray holes while ensuring water mist coverage. The design of "directional inclined spray holes pointing towards the central axis of the feeding hopper" allows the inclined water mist from the left and right spray pipes to converge at the center of the feeding hopper, forming a "centripetal converging water mist." Compared with non-directional inclined spraying, this reduces ineffective spraying of water mist onto the inner wall of the feeding hopper, improving dust capture efficiency (the central area is the main path of material fall and has the highest dust concentration) and avoiding material agglomeration and residue problems caused by excessive water mist adhering to the inner wall.

[0024] Furthermore: the pressure gauge can monitor the water pressure of the main inlet pipe in real time (avoiding damage to the spray pipe due to excessively high water pressure and dispersion of water mist due to excessively low water pressure), ensuring that the water pressure is stable within the optimal dust suppression range of 0.3-0.4MPa; the flow meter can accurately control the flow rate of a single spray pipe (1.5-1.8L / min), avoiding water waste due to excessive flow rate or insufficient water mist coverage due to insufficient flow rate; the design of "4 branch pipes corresponding to and connecting the spray pipes one by one" can ensure uniform water supply to the left and right sides and the upper and lower layers of the spray pipes, avoiding the problems of insufficient water supply and weak water mist in the far-end spray pipes caused by traditional single-pipe distribution, ensuring the consistency of water mist coverage in the entire feeding hopper, and further improving the stability of dust suppression effect.

[0025] Furthermore: The Y-type filter (40-60μm filtration accuracy) can filter impurities in the water source (such as silt, pipe corrosion particles), preventing impurities from entering the spray holes and causing blockages, reducing dust suppression interruptions caused by blockages (traditional spray pipes often experience localized lack of water mist due to blockages, leading to dust leakage); the PTFE nozzles have excellent anti-scaling properties, preventing calcium and magnesium ions or material residues in the slurry water from forming scale on the inner wall of the nozzle, extending the cleaning cycle of the spray holes (from the traditional weekly cleaning to monthly cleaning), reducing maintenance costs, while ensuring long-term unobstructed spray holes and ensuring a continuous and stable dust suppression effect.

[0026] Furthermore, the tempered glass observation window allows operators to observe the material falling in the hopper in real time (such as whether it clumps or blocks the feeding port) and the spraying effect (such as whether the water mist is uniform or whether there is a spray pipe malfunction), avoiding the material accumulation and dust suppression failure problems caused by traditional "blind feeding," and facilitating timely detection and adjustment of abnormalities. The design of "quick-opening inspection port + sealing ring" allows for maintenance of the spray pipe and filter (such as replacing nozzles and cleaning filters) without disassembling the entire feeding hopper, reducing maintenance time from the traditional 2 hours to 30 minutes and improving maintenance efficiency. At the same time, the sealing ring ensures that there is no dust leakage when the inspection port is closed, balancing the convenience of observation and maintenance with the sealing and dust suppression effect.

[0027] Furthermore, the epoxy resin or polytetrafluoroethylene anti-corrosion coating protects the inner wall of the feeding hopper from corrosion by acidic and alkaline materials (such as acidic dyes and alkaline additives) during the slurry preparation process. This avoids the unevenness of the inner wall caused by rust in traditional carbon steel feeding hoppers (which easily leads to material residue and bacterial growth), extending the service life of the feeding hopper (from the traditional 3 years to 5 years). At the same time, the smooth coating surface reduces the adhesion and residue of dry powder on the inner wall of the feeding hopper (residue amount reduced by more than 80%), preventing the product quality fluctuation caused by residual material clumping and mixing into the subsequent slurry preparation process. The smooth inner wall is also easy to clean (only requires rinsing with water), reducing cleaning difficulty and cost.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0029] 1. A dust suppression and recovery device for adding dry powder materials in a slurry mixing tank, which has a significant dust suppression effect. Through double-layer double-sided directional spraying, a three-dimensional "water mist surrounding net" is formed, and the dust control rate reaches more than 99%, with no visible dust leakage.

[0030] 2. In this utility model, there is zero material loss. The dust is captured by the water mist and falls into the mixing tank with the material, thus completely solving the problem of raw material waste.

[0031] 3. In this invention, water resources are recycled, and the sprayed water is directly used as the base water for slurry preparation, achieving zero wastewater discharge and saving 0.6-0.8 m³ of water per ton of dry powder.3 ;

[0032] 4. This utility model meets environmental protection standards, and the dust concentration in the workshop complies with national standards, thus avoiding environmental penalties;

[0033] 5. This utility model is highly practical, has a simple structure, is made of corrosion-resistant stainless steel, and has low maintenance costs after the addition of anti-clogging and observation components. It is also compatible with a variety of dry powder materials. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort, wherein:

[0035] Figure 1 This is a schematic diagram of the structure of this utility model;

[0036] Figure 2 This is a partial top view of the present invention;

[0037] Figure 3 This is a schematic diagram of the spray hole structure of this utility model;

[0038] Figure 4 This is a schematic diagram of the structure of the two sets of spray holes in the upper spray pipe of this utility model;

[0039] Figure 5 This is a schematic diagram of the structure of the two sets of spray holes in the lower spray pipe of this utility model;

[0040] The markings in the diagram are: 1-Slurry mixing tank body, 2-Feeding hopper, 3-Feeding port, 4-Upper spray pipe, 5-Lower spray pipe, 6-Spray hole, 7-Branch pipe, 8-Main water inlet pipe, 9-Pressure gauge, 10-Stop valve, 11-Flow meter, 12-Y-type filter, 13-Observation window, 14-Maintenance port. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0043] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0045] Example 1

[0046] This utility model discloses a dust suppression and recovery device for adding dry powder materials to a slurry mixing tank, such as... Figures 1-5 As shown, it includes a slurry mixing tank body 1, a feeding hopper 2, a spray pipe assembly, and a water inlet pipe;

[0047] The top of the mixing tank body 1 is equipped with a feeding port 3;

[0048] The feeding hopper 2 has a funnel-shaped structure. Its lower port is sealed to the feed port of the slurry mixing tank body 1, and its upper port is the dry powder feeding inlet.

[0049] Spray pipe assemblies are symmetrically arranged on the inner walls of the left and right sides of the feeding hopper 2;

[0050] Each spray pipe assembly includes one upper spray pipe 4 and one lower spray pipe 5;

[0051] The upper spray pipe 4 is fixed to the upper part of the feeding hopper 2, and the lower spray pipe 5 is fixed to the lower part of the feeding hopper 2 and close to the feed inlet of the mixing tank body 1.

[0052] Two rows of spray holes 6 are evenly distributed along the length of each upper spray pipe 4 and each lower spray pipe 5.

[0053] One row consists of vertically downward spray holes 6, and the other row consists of directional, inclined spray holes 6.

[0054] The directional inclined spray hole 6 of the upper spray pipe 4 forms a 60° angle with the axis of the upper spray pipe 4 and sprays inward and downward. The directional inclined spray hole 6 of the lower spray pipe 5 forms a 45° angle with the axis of the lower spray pipe 5 and sprays inward and downward. The water inlet pipe is connected to all the spray pipes through the branch pipe 7.

[0055] The upper port diameter of the feeding hopper 2 is larger than the lower port diameter, and the material is 304 stainless steel or Q235 carbon steel; the lower port of the feeding hopper 2 is connected to the feed inlet of the slurry tank body 1 through a flange, and an oil-resistant rubber sealing ring is provided between the flanges.

[0056] One of the upper spray pipes 4 is 1 / 3 of the total height of the feeding hopper 2 at the distance from the upper port of the feeding hopper 2, while the other upper spray pipe 4 is close to the upper port of the feeding hopper 2. The lower spray pipe 5 is 1 / 3 of the total height of the feeding hopper 2 at the distance from the lower port of the feeding hopper 2. Both the upper spray pipe 4 and the lower spray pipe 5 are fixed to the inner wall of the feeding hopper 2 by welding or flange connection.

[0057] The diameter of both the vertically downward spray hole 6 and the directional inclined spray hole 6 is 1.5-2.5mm, and the distance between two adjacent spray holes 6 is 40-60mm; the spray direction of the directional inclined spray hole 6 is towards the central axis of the feeding hopper 2.

[0058] The water inlet pipeline includes a main water inlet pipe 8, a pressure gauge 9, a shut-off valve 10, and a flow meter 11. One end of the main water inlet pipe 8 is connected to the water source, and the other end is connected to the upper spray pipe 4 on the left and right sides and the lower spray pipe 5 on the left and right sides respectively through four branch pipes 7. The pressure gauge 9, shut-off valve 10, and flow meter 11 are all installed on the main water inlet pipe 8, with the shut-off valve 10 located between the water source and the flow meter 11, and the pressure gauge 9 located between the flow meter 11 and the branch pipe 7.

[0059] It also includes an anti-clogging component; the anti-clogging component includes a Y-type filter 12 and an anti-scaling nozzle; the Y-type filter 12 is installed at the connection between the branch pipe 7 and the corresponding spray pipe, and the filtration accuracy is 40-60μm; the anti-scaling nozzle is made of polytetrafluoroethylene, fixed at the spray hole 6 and connected to the corresponding spray pipe.

[0060] The side wall of the feeding hopper 2 is provided with an observation window 13 and an inspection port 14; the observation window 13 is made of tempered glass and has a sealing strip on the edge; the inspection port 14 has a rectangular structure and is equipped with a quick-opening sealing cover, and a rubber sealing ring is provided between the cover and the side wall of the feeding hopper 2.

[0061] The inner wall of the feeding hopper 2 is provided with an anti-corrosion coating, which is an epoxy resin coating or a polytetrafluoroethylene coating, with a coating thickness of 0.1-0.2mm.

[0062] The specific implementation method of this embodiment is as follows: a feeding device for starch-based dry powder materials.

[0063] Feed hopper parameters: material is 304 stainless steel, upper port diameter is 800mm, lower port diameter is 300mm, height is 600mm; the lower port is connected to the feed port (diameter 300mm) of the slurry tank body through a flange, and an oil-resistant rubber sealing ring is installed between the flanges;

[0064] Spray pipe assembly: The upper and lower spray pipes are both DN25 304 stainless steel pipes, which are fixed to the inner walls of the left and right sides of the feeding hopper by welding; one upper spray pipe is 50mm from the upper end, while the other upper spray pipe is 200mm from the upper end, and the lower spray pipe is 200mm from the lower end.

[0065] Spray hole parameters: The diameter of both the vertical downward spray holes and the directional inclined spray holes is 2mm, and the hole spacing is 50mm; the included angle of the directional inclined spray holes of the upper layer spray pipe is 60°, and that of the lower layer is 45°.

[0066] Water inlet pipeline: The main water inlet pipe is a DN32 PPR pipe with a pressure gauge range of 0-1MPa and a flow meter range of 0-5L / min; adjust the water pressure to 0.3MPa and the flow rate of a single spray pipe is 1.5L / min;

[0067] Results: When starch is added, the dust concentration in the workshop is ≤5mg / m³. 3 (Complies with GBZ2.1-2019 requirements), material recovery rate 100%, water saving 0.8m³ per ton of starch. 3 .

[0068] Example 2

[0069] This utility model discloses a dust suppression and recovery device for adding dry powder materials to a slurry mixing tank, such as... Figures 1-5 As shown, the specific implementation method of this embodiment is as follows:

[0070] Feeding device for talc powder

[0071] Basic structure: Same as Example 1, except that:

[0072] Anti-clogging optimization: A Y-type filter (filtration accuracy 50μm) is installed at the connection between the branch pipe and the spray pipe, and the spray holes are made of polytetrafluoroethylene nozzles (to prevent scaling);

[0073] Observation and maintenance: A 300×200mm tempered glass observation window (with sealing strip) is opened on the side wall of the feeding hopper, and a 150×150mm maintenance port (with quick-opening handle) is opened below the observation window;

[0074] Parameter adjustment: water pressure adjusted to 0.4MPa, flow rate of a single spray pipe 1.8L / min;

[0075] Results: When talc powder (200 mesh) is added, the dust suppression rate is 99.5%. The spray holes can be used continuously for 30 days without clogging. The feeding status can be monitored in real time through the observation window. The entire feeding hopper does not need to be disassembled during maintenance.

[0076] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions and improvements made by those skilled in the art within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A dust suppression and recovery device for adding dry powder materials in a slurry mixing tank, characterized in that: Includes the slurry mixing tank body (1), feeding hopper (2), spray pipe assembly and water inlet pipe; The top of the slurry mixing tank body (1) is provided with a feeding port (3); The feeding hopper (2) has a funnel-shaped structure, with its lower port sealed to the feed inlet of the slurry tank body (1), and its upper port being the dry powder feeding inlet; Spray pipe assemblies are symmetrically arranged on the inner walls of the left and right sides of the feeding hopper (2); Each spray pipe assembly includes one upper spray pipe (4) and one lower spray pipe (5); The upper spray pipe (4) is fixed to the upper part of the feeding hopper (2), and the lower spray pipe (5) is fixed to the lower part of the feeding hopper (2) and close to the feed inlet of the slurry tank body (1); Each of the upper spray pipes (4) and each of the lower spray pipes (5) has two rows of spray holes (6) evenly distributed along the length of the pipe. One row consists of vertically downward spray holes (6), and the other row consists of directional inclined spray holes (6). The directional inclined spray hole (6) of the upper spray pipe (4) forms a 60° angle with the axis of the upper spray pipe (4) and sprays inward and downward. The directional inclined spray hole (6) of the lower spray pipe (5) forms a 45° angle with the axis of the lower spray pipe (5) and sprays inward and downward. The water inlet pipe is connected to all the spray pipes through branch pipes (7).

2. The dust suppression and recovery device for adding dry powder materials to a slurry mixing tank according to claim 1, characterized in that: The upper port diameter of the feeding hopper (2) is larger than the lower port diameter, and the material is 304 stainless steel or Q235 carbon steel; the lower port of the feeding hopper (2) is connected to the feed inlet of the slurry tank body (1) through a flange, and an oil-resistant rubber sealing ring is provided between the flanges.

3. The dust suppression and recovery device for adding dry powder materials to a slurry mixing tank according to claim 1, characterized in that: One of the upper spray pipes (4) is located at a distance of 1 / 3 of the total height of the feeding hopper (2) from the upper port, while the other upper spray pipe (4) is located close to the upper port of the feeding hopper (2). The lower spray pipe (5) is located at a distance of 1 / 3 of the total height of the feeding hopper (2) from the lower port. Both the upper spray pipe (4) and the lower spray pipe (5) are fixed to the inner wall of the feeding hopper (2) by welding or flange connection.

4. A dust suppression and recovery device for adding dry powder materials to a slurry mixing tank according to claim 1, characterized in that: The diameter of both the vertically downward spray hole (6) and the directional inclined spray hole (6) is 1.5-2.5mm, and the distance between two adjacent spray holes (6) is 40-60mm; the spray direction of the directional inclined spray hole (6) is directed towards the central axis of the feeding hopper (2).

5. A dust suppression and recovery device for adding dry powder materials to a slurry mixing tank according to claim 1, characterized in that: The water inlet pipeline includes a main water inlet pipe (8), a pressure gauge (9), a shut-off valve (10), and a flow meter (11). One end of the main water inlet pipe (8) is connected to a water source, and the other end is connected to the upper spray pipe (4) on the left and right sides and the lower spray pipe (5) on the left and right sides respectively through four branch pipes (7). The pressure gauge (9), shut-off valve (10), and flow meter (11) are all installed on the main water inlet pipe (8), and the shut-off valve (10) is located between the water source and the flow meter (11), and the pressure gauge (9) is located between the flow meter (11) and the branch pipe (7).

6. A dust suppression and recovery device for adding dry powder materials to a slurry mixing tank according to claim 1, characterized in that: It also includes an anti-clogging component; the anti-clogging component includes a Y-type filter (12) and an anti-scaling nozzle; the Y-type filter (12) is installed at the connection between the branch pipe (7) and the corresponding spray pipe, and the filtration accuracy is 40-60μm; the anti-scaling nozzle is made of polytetrafluoroethylene, fixed at the spray hole (6) and connected to the corresponding spray pipe.

7. A dust suppression and recovery device for adding dry powder materials to a slurry mixing tank according to claim 1, characterized in that: The side wall of the feeding hopper (2) is provided with an observation window (13) and an inspection port (14); the observation window (13) is made of tempered glass and has a sealing strip on the edge; the inspection port (14) is a rectangular structure and is equipped with a quick-opening sealing cover plate, and a rubber sealing ring is provided between the cover plate and the side wall of the feeding hopper (2).

8. A dust suppression and recovery device for adding dry powder materials to a slurry mixing tank according to claim 1, characterized in that: The inner wall of the feeding hopper (2) is provided with an anti-corrosion coating, which is an epoxy resin coating or a polytetrafluoroethylene coating, and the coating thickness is 0.1-0.2 mm.

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