Iron oxide dust wet trapping and recycling device

Abstract

The utility model discloses a wet trapping and recycling device for iron oxide dust, which belongs to the technical field of gas dust removal and comprises an air suction pipe, a first fan, a first venturi tube, a first separator, a second venturi tube and a washing tank, a first liquid storage area is arranged at the bottom in the first separator, a second liquid storage area is arranged at the bottom in the washing tank, and a second liquid storage area is arranged at the bottom in the washing tank. The first Venturi tube comprises a first inlet tube, a throat tube and a first diverging tube, the throat tube is connected with a first liquid inlet tube, and the first liquid inlet tube is communicated with the first liquid storage area. According to the utility model, airflow containing iron oxide dust is subjected to two-pass gas-liquid mixing, and then is subjected to filler and spray trapping in the washing tank, so that the effect of trapping dust in the gas is good; gas enters the inlet pipe of the first Venturi tube and is suitable for trapping micron-sized coarse particles, and liquid enters the inlet pipe of the second Venturi tube, so that the trapping efficiency of submicron-sized particles is high; and the captured iron oxide dust slurry is discharged through the two slurry discharge ports and can be discharged into the rinsing bath, so that the recovery is convenient.

Description

Technical Field

[0001] This utility model belongs to the field of gas dust removal technology, specifically relating to a wet collection and recovery device for iron oxide dust. Background Technology

[0002] The production of iron oxide red employs solid purification technologies such as water washing and grinding. After silicon removal, the iron oxide powder is transported from the iron oxide powder silo to the primary screening tank in the solid purification room via negative pressure gas from the original acid regeneration station. After primary screening, it enters the water washing tank, where pure water is introduced to mix the iron powder with water to form an iron powder slurry. This slurry then enters the secondary screening tank by gravity. The iron powder slurry from the secondary screening tank flows into the mixing tank by gravity, where impurities in the iron powder are fully dissolved in the water through agitation. The slurry from the mixing tank is pumped to a filter press for dewatering. The dewatered slurry cake is then sent to a vibrating screen to separate finer particles, which are then dried in a drying oven. The dried iron powder is then sent to a vibrating ball mill for grinding to meet the finished product requirements. Finally, it is transported to the iron oxide red silo for packaging and shipment via negative pressure gas.

[0003] During the production of iron oxide, iron oxide dust is easily dispersed, posing a threat to the health of workers and wasting iron oxide raw materials. Most existing dust removal devices use bag filters, which can collect and filter dust. However, the filters are in the form of filter bags and need to be replaced regularly. The iron oxide dust in the replaced filter bags cannot be recycled, resulting in waste. The filter bags themselves cannot be recycled either. Furthermore, the use of filter bags with smaller pore sizes to improve filtration accuracy increases the frequency of filter bag replacement. The filter bags become solid waste, which is wasteful and environmentally unfriendly. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a wet collection and recovery device for iron oxide dust that can fully collect and conveniently recover iron oxide dust without using filter bags.

[0005] Technical solution: To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A wet collection and recovery device for iron oxide dust includes a suction pipe, a first fan connected to the suction pipe, a first venturi tube connected to the first fan, a first separator connected to the first venturi tube, a second venturi tube connected to the first separator, and a washing tank connected to the second venturi tube. The first separator has a first liquid storage area at its bottom, and the washing tank has a second liquid storage area at its bottom. The first venturi tube includes a first inlet pipe connected to the first fan, a throat pipe connected to the first inlet pipe, and a first diffuser pipe connected to the throat pipe. A first liquid inlet pipe is connected to the throat pipe and communicates with the first liquid storage area.

[0007] Furthermore, the second venturi tube includes a second inlet pipe, an intake chamber connected to the second inlet pipe, a mixing pipe connected to the intake chamber, and a second diffuser connected to the mixing pipe. The second inlet pipe is connected to the second liquid storage area via a circulation pump, and the intake chamber is connected to the first separator.

[0008] Furthermore, the washing tank is provided with a partition plate, which divides the washing tank into a first functional area and a second functional area that are interconnected, and the outlet end of the second diffuser is connected to the first functional area.

[0009] Furthermore, the second functional area is provided with a packing layer and a spray pipe. The packing layer contains multiple packing balls, and the spray pipe is provided with multiple nozzles. The spray pipe is connected to the circulating pump.

[0010] Furthermore, the partition extends downward from the top wall of the washing tank.

[0011] Furthermore, a demister is also provided in the second functional area.

[0012] Furthermore, the top sidewall of the first separator is connected to the washing tank via a first intermediate pipe, and the first liquid storage area of ​​the first separator is connected to the second liquid storage area of ​​the washing tank via a second intermediate pipe.

[0013] Furthermore, the first separator is provided with a first sludge discharge port, and the washing tank is provided with a second sludge discharge port.

[0014] Furthermore, the suction pipe includes a flexible hose section and a suction hood connected to the flexible hose section.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0016] 1. By setting up a first Venturi tube, a first separator, a second Venturi tube, and a scrubbing tank, most of the dust is settled after passing through the first Venturi tube and the first separator. The air continues to rise and then passes through the second Venturi tube. The airflow containing iron oxide dust undergoes two gas-liquid mixing processes, and then passes through the packing and spray of the scrubbing tank for collection. This method has a good dust collection effect on the gas.

[0017] 2. The inlet tube of the first Venturi tube introduces gas and draws in liquid. Dust and mist droplets in the airflow collide to form large particles, which is suitable for capturing micron-sized coarse particles. The inlet tube of the second Venturi tube introduces liquid and draws in gas. The high-speed liquid atomizes into fine droplets, which encapsulate dust particles through inertial collision, resulting in high efficiency in capturing submicron-sized particles.

[0018] 3. The collected iron oxide dust slurry is discharged through two sludge discharge ports and can be discharged into the water washing tank for easy recycling;

[0019] 4. Two intermediate pipes are installed between the first separator and the washing tank to facilitate direct communication between air and liquid. The air in the first separator can be optionally passed through the second Venturi tube. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the device according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the suction pipe structure in the embodiment;

[0022] Figure 3 This is a schematic diagram of the first Venturi tube structure in the embodiment;

[0023] Figure 4 This is a schematic diagram of the throat tube outlet section structure in the embodiment;

[0024] Figure 5 This is a schematic diagram of the first separator structure in the embodiment;

[0025] Figure 6 This is a schematic diagram of the second Venturi tube structure in the embodiment;

[0026] Figure 7 This is a schematic diagram of the washing tank structure in the embodiment. Detailed Implementation

[0027] The present invention will be further illustrated below with reference to specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0028] like Figure 1 and Figure 2 As shown, a wet collection and recovery device for iron oxide dust includes a suction pipe 1, a first fan 2, a first venturi tube 3, a first separator 4, a second venturi tube 5, and a washing tank 6. The suction port of the first fan 2 is connected to the suction pipe 1. The first fan 2 is an existing centrifugal fan, which can generate a large suction force at the suction pipe 1. The suction pipe 1 includes a fixed pipe section, a flexible hose section 12, and a suction hood 11. The fixed pipe section is connected to the suction port of the first fan 2, and the flexible hose section 12 is connected to the fixed pipe section. The flexible hose section 12 is an existing canvas hose, which is easy to bend and adjust the direction within a certain angle and is convenient to install and has a lightweight structure. The suction hood 11 is connected to the flexible hose section 12. The suction hood 11 is an existing rectangular hood, which is fixed in the area with more iron oxide dust to improve the dust collection effect.

[0029] like Figure 1 , Figure 3 and Figure 4As shown, the first venturi tube 3 is connected to the outlet end of the first blower 2. The first venturi tube 3 is arranged horizontally and includes a first inlet pipe 31, a throat 32, a first diffuser 33, and a first liquid inlet pipe 34. The inlet end of the first inlet pipe 31 is connected to the outlet end of the first blower 2, and the diameter of the first inlet pipe 31 gradually narrows. The throat 32 is connected to the first inlet pipe 31, and the outlet end of the throat 32 is connected to the first diffuser 33. The outlet end of the first diffuser 33 is connected to the first separator 4. The first liquid inlet pipe 34 is connected to the throat 32. The outer ring of the throat 32 is provided with a first liquid inlet ring pipe 341 connected to the first liquid inlet pipe 34. Pipe 341 is connected to throat 32 via multiple first liquid inlet branches 342. These branches are arranged in a ring array on the outer circumferential sidewall of throat 32. Airflow generated by the first fan 2 enters the first inlet pipe 31. After passing through the constricted end of the first inlet pipe 31, the flow velocity increases significantly, while the static pressure decreases. At the narrowest point of throat 32, suction is generated, drawing liquid from the first liquid inlet pipe 34 into throat 32. The entering liquid mixes with the gas and enters the first separator 4 through the first diffuser 33. The entering liquid collides with the high-speed gas in the first venturi tube 3 to form droplets, while dust particles in the airflow collide with the droplets to form larger particles. The first separator 4 is cylindrical in shape. The outlet end of the first diffuser 33 enters the first separator 4 tangentially from the sidewall of the first separator 4, thus forming a cyclone separator. Large dust particles and droplets settle, while the gas rises.

[0030] like Figure 1 and Figure 5 As shown, the first separator 4 has a first liquid storage area 401 at its bottom, which is used to store liquid. In this embodiment, the liquid is water. The bottom of the first separator 4 is inverted cone-shaped, and the lowest point of the inverted cone bottom is provided with a first sludge discharge port 41. A first sludge discharge valve is provided at the first sludge discharge port 41, through which sludge containing iron oxide dust can be discharged for easy recycling. The top of the first separator 4 is provided with a first exhaust pipe 44, and the airflow is upward from the first exhaust pipe 44. The first liquid inlet pipe 34 is connected to the first liquid storage area 401 through a first liquid inlet pump 35. The connection between the first liquid inlet pump 35 and the first separator 4 is located at a higher position in the first liquid storage area 401. The first liquid inlet pump 35 can transport the water in the first liquid storage area 401 to the throat 32 of the first venturi tube 3.

[0031] like Figure 1 , Figure 6 and Figure 7As shown, the second Venturi tube 5 is connected to the first separator 4, and the washing tank 6 is connected to the second Venturi tube 5. The washing tank 6 is cylindrical in shape, and the bottom of the washing tank 6 is also inverted conical. A second liquid storage area 601 is provided at the bottom of the washing tank 6 to store water. A second sludge discharge port 61 is provided at the inverted conical bottom, and a second sludge discharge valve is provided at the second sludge discharge port 61. Sludge containing iron oxide dust can be discharged from the washing tank 6 through the second sludge discharge port 61 for easy recycling. A partition plate 62 is provided inside the washing tank 6. The partition plate 62 is a rectangular plate that extends downwards from the top wall of the washing tank 6. The lower end of the partition plate 62 is a certain distance from the second liquid storage area 601. The partition plate 62 divides the washing tank 6 into a first functional area 602 and a second functional area 603 that are interconnected. The first functional area 602 is located on the right side, and the second functional area 603 is located on the left side. The volume of the second functional area 603 is larger than that of the first functional area 602. The second venturi tube 5 is vertically arranged and connected to the top wall of the washing tank 6. The outlet end of the second venturi tube 5 corresponds to the first functional area 602. The second venturi tube 5 includes a second inlet pipe 51, an air intake chamber 52, a mixing pipe 53, and a second diffuser 54. The inlet end of the second inlet pipe 51 is connected to the circulation pump 7 through a first circulation branch pipe 71. A valve is provided on the first circulation branch pipe 71 to control the opening and closing of the corresponding pipeline. The inlet end of the circulation pump 7 is connected to the second liquid storage area 601, thereby transporting water from the second liquid storage area 601 to the second inlet pipe 51. The second inlet pipe 51 is nozzle-shaped, with its diameter gradually decreasing downwards. The air intake chamber 52 is connected to the outer wall of the middle section of the second inlet pipe 51. The water spray nozzle at the bottom of the second inlet pipe 51 is located at... At the lower position of the suction chamber 52, the lower end of the suction chamber 52 is connected to the mixing pipe 53, and the lower end of the mixing pipe 53 is connected to the second diffuser 54. The diameter of the second diffuser 54 gradually increases and the lower end of the second diffuser 54 is connected to the washing tank 6. The downward water flow speed of the second inlet pipe 51 is accelerated, thereby generating negative pressure in the suction chamber 52. The side wall of the suction chamber 52 is connected to the first exhaust pipe 44 through the second air inlet pipe 55, thereby drawing the rising air in the first separator 4 into the suction chamber 52. The drawn-in air is fully mixed in the mixing pipe 53, and the dust particles in the air are dispersed and accelerated by the high-speed fluid. The outlet end of the second diffuser 54 is connected to the first functional area 602, and the mixed flow of air and water enters the first functional area 602 of the washing tank 6.

[0032] like Figure 1 and Figure 7As shown, the second functional area 603 includes a packing layer 63, a spray pipe 64, and a demister 65. The packing layer 63 is located below the spray pipe 64 and contains multiple packing balls. The packing balls are made of existing polypropylene, which increases the gas-liquid contact area, optimizes fluid distribution, and improves dust removal efficiency. The spray pipe 64 has multiple nozzles 641 facing the packing layer 63. The spray pipe 64 is connected to the circulation pump 7 via a second circulation branch pipe 72. The second circulation branch pipe 72 has valves to control the on / off state of the corresponding pipes. The circulation pump 7 delivers water to the spray pipe 64, and the nozzles 641 spray water mist to collect iron oxide dust in the air. A demister 65 is positioned above the spray pipe 64, near the top wall of the washing tank 6. The demister 65 uses an existing baffle demister. After the upward-moving air passes through the demister 65 and has its entrained droplets removed, it is discharged from the second exhaust pipe 66 at the top of the washing tank 6. The second exhaust pipe 66 is connected to an external fan. A water tank 67 is connected to the side of the washing tank 6, and the water tank 67 communicates with the second liquid storage area 601, facilitating the replenishment of water to the second liquid storage area 601. The inlet of the circulating pump 7 is connected to the water tank 67, thus communicating with the second liquid storage area 601.

[0033] like Figure 1 and Figure 5 As shown, the top sidewall of the first separator 4 is connected to the washing tank 6 via a first intermediate pipe 42. A first intermediate valve 421 is installed on the first intermediate pipe 42, which is a conventional butterfly valve used to control the opening and closing of the first intermediate pipe 42. When the gas pressure inside the first separator 4 is too high, or when it is not necessary to pass through the second venturi tube 5, the first intermediate valve 421 can be opened, allowing air inside the first separator 4 to directly enter the washing tank 6 through the first intermediate pipe 42. The first liquid storage area 401 of the first separator 4 is connected to the second liquid storage area 601 of the washing tank 6 via a second intermediate pipe 43. A second intermediate valve 431 is installed on the second intermediate pipe 43, which is a conventional butterfly valve used to control the opening and closing of the second intermediate pipe 43. The second intermediate pipe 43 connects the two liquid storage areas to balance the liquid level.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A wet collection and recovery device for iron oxide dust, characterized in that, The device includes an air intake pipe (1), a first fan (2) connected to the air intake pipe (1), a first venturi pipe (3) connected to the first fan (2), a first separator (4) connected to the first venturi pipe (3), a second venturi pipe (5) connected to the first separator (4), and a washing tank (6) connected to the second venturi pipe (5). The first separator (4) has a first liquid storage area (401) at the bottom, and the washing tank (6) has a second liquid storage area (601) at the bottom. The first venturi pipe (3) includes a first inlet pipe (31) connected to the first fan (2), a throat pipe (32) connected to the first inlet pipe (31), and a first diffuser pipe (33) connected to the throat pipe (32). A first liquid inlet pipe (34) is connected to the throat pipe (32), and the first liquid inlet pipe (34) communicates with the first liquid storage area (401).

2. The wet collection and recovery device for iron oxide dust according to claim 1, characterized in that, The second venturi tube (5) includes a second inlet pipe (51), an air intake chamber (52) connected to the second inlet pipe (51), a mixing pipe (53) connected to the air intake chamber (52), and a second diffuser (54) connected to the mixing pipe (53). The second inlet pipe (51) is connected to the second liquid storage area (601) through a circulation pump (7), and the air intake chamber (52) is connected to the first separator (4).

3. The wet collection and recovery device for iron oxide dust according to claim 2, characterized in that, The washing tank (6) is provided with a partition plate (62), which divides the washing tank (6) into a first functional area (602) and a second functional area (603) that are interconnected. The outlet end of the second diffuser (54) is connected to the first functional area (602).

4. The wet collection and recovery device for iron oxide dust according to claim 3, characterized in that, The second functional area (603) is provided with a packing layer (63) and a spray pipe (64). The packing layer (63) is provided with a plurality of packing balls, and the spray pipe (64) is provided with a plurality of nozzles (641). The spray pipe (64) is connected to the circulating pump (7).

5. The wet collection and recovery device for iron oxide dust according to claim 3, characterized in that, The partition plate (62) extends downward from the top wall of the washing tank (6).

6. The wet collection and recovery device for iron oxide dust according to claim 3, characterized in that, The second functional area (603) is also equipped with a demister (65).

7. The wet collection and recovery device for iron oxide dust according to claim 1, characterized in that, The top sidewall of the first separator (4) is connected to the washing tank (6) through the first intermediate pipe (42), and the first liquid storage area (401) of the first separator (4) is connected to the second liquid storage area (601) of the washing tank (6) through the second intermediate pipe (43).

8. The wet collection and recovery device for iron oxide dust according to claim 1, characterized in that, The first separator (4) is provided with a first mud discharge port (41), and the washing tank (6) is provided with a second mud discharge port (61).

9. The wet collection and recovery device for iron oxide dust according to claim 1, characterized in that, The suction pipe (1) includes a flexible hose section (12) and a suction hood (11) connected to the flexible hose section (12).

Images