Tail gas treatment device for purifying crude white arsenic

Abstract

The utility model relates to a tail gas treatment device for purifying crude white arsenic, which comprises a spray tower, an immersion cavity is separated from the upper part in the spray tower through a partition plate, tail gas treatment liquid is placed in the immersion cavity, a gas inlet pipe is communicated with the upper part of the spray tower and extends into the bottom of the immersion cavity, and the end part of the gas inlet pipe is of a funnel-shaped diffusion structure. Tail gas can be in full contact with tail gas treatment liquid; a plurality of groups of atomizing nozzles are arranged on the inner wall of the spraying tower on the outer side of the immersion cavity at intervals, and the gas is further sprayed for the second time through the atomizing nozzles on the side edge of the spraying tower after coming out of the immersion cavity; a baffle plate is fixed below the spray head, the other end of the baffle plate is not connected with the inner wall of the spray tower, the lower part of the baffle plate is communicated with a gas outlet pipe, the baffle plate can prevent gas above from directly entering the gas outlet pipe, meanwhile, mist spray of the atomizing spray head can form a layer of wet liquid surface on the surface of the baffle plate, and the gas can be fully contacted with the liquid surface again when continuously advancing; it is ensured that harmful substances in the tail gas are fully reacted and absorbed by the tail gas treatment liquid; a water outlet pipe is arranged below the gas outlet pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to tail gas treatment field especially relates to a tail gas treatment device of crude white arsenic purification. BACKGROUND

[0002] Arsenic needs to be extracted from ore through a smelting process. Arsenic usually exists in the form of ore, the most common mineral being arsenic ore (arsenic-containing arsenic sand), and some other sulfides, oxides and carbonates also contain arsenic. In order to extract pure arsenic, arsenic in arsenic ore needs to be oxidized or reduced to metallic arsenic through smelting, and then purified.

[0003] Tail gas generated in the smelting process of arsenic usually contains harmful substances such as arsenic vapor and sulfur dioxide, etc. In the process of treating these tail gas, a spray tower is used. The spray tower makes the tail gas fully contact and mix with the liquid through the spray layer, so as to absorb and dissolve the pollutants and dust in the tail gas.

[0004] However, in the process of treating waste gas, the flow of waste gas from the inlet pipe into the tower body is not uniform, and part of the waste gas is not absorbed and reacted. Furthermore, in the existing spray tower, the amount of solution sprayed by the spray head is limited. When a large amount of gas is introduced or the flow rate of waste gas is too fast, the spray cannot absorb the substances in the waste gas in time, resulting in that part of the harmful gas remains in the air discharged from the spray tower, so that the harmful tail gas is not fully treated. SUMMARY

[0005] Therefore, the purpose of the utility model is to provide a tail gas treatment device for crude white arsenic, which has multi-stage absorption, full reaction and avoids harmful gas residue.

[0006] To achieve the above purpose, the utility model adopts the technical scheme of a tail gas treatment device for crude white arsenic purification, which comprises a spray tower. An immersion chamber is separated by a partition plate at the upper part inside the spray tower. A tail gas treatment liquid is placed in the immersion chamber. An inlet pipe is connected to the upper part of the spray tower. The end of the inlet pipe is in the form of a funnel-shaped diffusion structure and extends into the bottom of the immersion chamber.

[0007] A plurality of groups of atomizing spray heads are arranged on the inner wall of the spray tower outside the immersion chamber.

[0008] A baffle is fixed below the spray head, and the other end of the baffle is not connected to the inner wall of the spray tower. An outlet pipe is connected to the lower part of the baffle.

[0009] A water outlet pipe is arranged below the outlet pipe.

[0010] The beneficial effects of the above technical solutions are: the gas inlet pipe is directly inserted into the tail gas treatment liquid in the immersion cavity, which can make the tail gas fully contact with the tail gas treatment liquid, the remaining gas after reaction can be further sprayed by the atomizing nozzle on the side of the spray tower, the baffle can block the gas from directly entering the gas outlet pipe, and the spray of the atomizing nozzle can form a wet liquid surface on the surface of the baffle, so that the gas can be fully contacted with the liquid surface again, thereby ensuring that the tail gas can be fully contacted with the tail gas treatment liquid on the running path in the spray tower, and ensuring that the harmful substances in the tail gas can be fully reacted and absorbed by the tail gas treatment liquid, thereby preventing the gas discharged from the gas outlet pipe from containing residual harmful substances.

[0011] Further, the water outlet pipe is connected to the upper part of the spray tower through a booster pump, and a diffuser nozzle is arranged at the end of the water outlet pipe, the diffuser nozzle is located above the immersion cavity, and the atomizing nozzle is connected to the circulating water outlet pipe.

[0012] Beneficial effects: the circulating water path can make the tail gas treatment liquid be recycled, reducing the waste of tail gas treatment liquid, and the diffuser nozzle can spray the gas coming out of the immersion cavity from the top, and can stir the solution in the immersion cavity, so that the tail gas in the gas inlet pipe can be more fully contacted with the tail gas treatment liquid.

[0013] Further, the water outlet pipe is connected to the liquid storage tank through a three-way joint, the liquid storage tank stores the tail gas treatment liquid, a switch valve is arranged at the outlet of the liquid storage tank, and a switch valve is arranged on the water outlet pipe in front of the connection position of the atomizing nozzle.

[0014] Beneficial effects: the liquid storage tank connected with the tail gas treatment liquid can increase the external liquid supply mode in the recycling mode of the tail gas treatment liquid, and facilitate the external liquid supply when the recycling efficiency of the tail gas treatment liquid is reduced.

[0015] Further, the baffle is inclined upward.

[0016] Beneficial effects: the baffle and the inner wall of the spray tower can form a temporary storage space, so that the tail gas treatment liquid overflowing from the immersion cavity can form a clear liquid surface, and the gas can be further contacted with the tail gas treatment liquid.

[0017] Further, a through unloading port is formed in the baffle, the unloading port is located in a vertical direction without interfering with the baffle, an unloading valve is arranged on the unloading port, a filter screen is fixed at the bottom of the spray tower, a blowdown port is formed in the inner wall of the spray tower on one side of the filter screen, and a blowdown valve is arranged on the blowdown port.

[0018] Beneficial effects: the tail gas contains a small amount of solid particle impurities such as smoke dust, the unloading valve can regularly discharge the solid impurities deposited at the bottom of the immersion cavity, after passing through the filter screen, the solution enters the circulating water path from the water outlet pipe, and the solid impurities can be cleaned out of the spray tower through the blowdown valve.

[0019] Further, the filter screen is arranged obliquely upwards, one end of the filter screen is fixed to the inner wall of the spray tower, and the other end is fixedly connected to the bottom of the baffle.

[0020] Beneficial effects: on the one hand, solid impurities can be gathered together along with the slope of the filter screen, so that the solid impurities are collected by the blowdown port, and on the other hand, the baffle can be supported, and when the overflow solution above the baffle is gathered, the load-bearing structure is more stable.

[0021] Further, the tower body of the spray tower is a cuboid.

[0022] Beneficial effects: facilitate the processing and manufacturing of the partition plate and the baffle. DETAILED DESCRIPTION

[0023] Figure 1 is a structural schematic diagram of the utility model;

[0024] In the drawing: 1 - spray tower, 2 - partition plate, 3 - immersion chamber, 4 - air inlet pipe, 5 - atomizing nozzle, 6 - baffle, 7 - air outlet pipe, 8 - water outlet pipe, 9 - booster pump, 10 - diffuser nozzle, 11 - filter screen, 12 - discharge valve, 13 - blowdown valve, 14 - tee, 15 - liquid storage tank, 16 - on-off valve. DETAILED DESCRIPTION

[0025] The utility model discloses a tail gas treatment device of crude white arsenic purification further in detail in combination with the drawings and specific implementation.

[0026] As Figure 1 Indicated, the utility model discloses a tail gas treatment device of crude white arsenic purification, including spray tower 1, the upper portion of the inside of spray tower 1 is separated by partition plate 2 and forms immersion chamber 3, and the tail gas treatment liquid is placed in immersion chamber 3, and air inlet pipe 4 is connected with the upper portion of spray tower 1 and extends into the bottom of immersion chamber 3, and the end of air inlet pipe 4 is funnel-shaped diffusion structure, which can make the tail gas fully contact with the tail gas treatment liquid, a plurality of groups of atomizing nozzles 5 are arranged on the inner wall of spray tower 1 outside immersion chamber 3, and the gas further passes through the secondary spray of the atomizing nozzle 5 of the side of spray tower 1 after coming out of immersion chamber 3, the baffle 6 is fixed below the nozzle, and the other end of the baffle 6 is not connected with the inner wall of spray tower 1, the baffle 6 is connected with air outlet pipe 7 below, the baffle 6 can block the gas above from directly entering air outlet pipe 7, and the spray of atomizing nozzle 5 can form a wet surface on the surface of baffle 6, and the gas continues to travel and can be fully contacted with the surface again, which ensures that the harmful substances in the tail gas are fully reacted and absorbed by the tail gas treatment liquid, and the water outlet pipe 8 is arranged below air outlet pipe 7.

[0027] In this embodiment, in order to recycle the tail gas treatment liquid, reduce the consumption and waste of the tail gas treatment liquid, the tail gas treatment liquid sprayed by the atomizing nozzle 5 adopts a circulating water supply mode, the outlet pipe 8 is connected to the upper part of the spray tower 1 through the booster pump 9, the outlet pipe 8 is provided with a diffuser nozzle 10 at the end, the atomizing nozzle 5 is connected to the circulating outlet pipe 8, the booster pump 9 supplies the tail gas treatment liquid to the upper part of the spray tower 1, and the diffuser nozzle 10 can spray the gas coming out of the immersion chamber 3 from the top, further improving the treatment effect of the tail gas treatment liquid on the tail gas. At the same time, the diffuser nozzle 10 is located above the immersion chamber 3, and the dispersed water flow can form a stirring effect on the liquid surface of the immersion chamber 3, thereby accelerating the fluctuation of the tail gas treatment liquid in the immersion chamber 3, so that the tail gas in the inlet pipe 4 and the tail gas treatment liquid are in full contact.

[0028] In this embodiment, considering that the concentration of the tail gas treatment liquid decreases after multiple cycles, and the efficiency of treating the tail gas decreases, an external tail gas treatment liquid supply mode is added to the circulating water circuit of the outlet pipe 8, the outlet pipe 8 is connected to the liquid storage tank 15 through the three-way valve 14, the liquid storage tank 15 stores the tail gas treatment liquid, the outlet of the liquid storage tank 15 is provided with a switch valve 16, and the atomizing nozzle 5 is connected to the outlet pipe 8 at the front end. The switch valve 16 is provided, when external tail gas treatment liquid is needed, the switch valve 16 at the front end of the atomizing nozzle 5 is closed, and the switch valve 16 at the outlet of the liquid storage tank 15 is opened. The tail gas treatment liquid in the liquid storage tank 15 can be directly supplied to the atomizing nozzle 5 and the diffuser nozzle 10 for spraying, thereby ensuring the treatment effect of the spray tower 1 on the tail gas.

[0029] In this embodiment, the baffle 6 is inclined upward, and the baffle 6 and the inner wall of the spray tower 1 can form a temporary storage space, so as to collect the tail gas treatment liquid overflowing from the immersion chamber 3 to form a obvious liquid surface. When the gas passes above the liquid surface, it can fully contact with the tail gas treatment liquid. When the liquid level above the baffle 6 accumulates to the end of the baffle 6, the tail gas treatment liquid further overflows from the end of the baffle 6 and forms a vertical water curtain. The gas needs to pass through the water curtain to be discharged from the outlet pipe 7. The tail gas treatment liquid has an additional absorption effect of the gas passing through the water curtain based on the spraying.

[0030] In this embodiment, considering that the tail gas contains a small amount of solid particle impurities such as soot, and that the solid impurities are deposited at the bottom of the immersion chamber 3 after long-term use of the spray tower 1, a through unloading port is arranged on the baffle 2, and the position of the unloading port in the vertical direction does not interfere with the baffle 6, preventing the falling material in the immersion chamber 3 from falling on the baffle 6 and causing subsequent difficulty in processing. The unloading port is provided with an unloading valve 12, and opening the unloading valve 12 can discharge the impurities at the bottom of the immersion chamber 3 from the immersion chamber 3. The bottom of the spray tower 1 is fixed with a filter screen 11, and the falling material flowing out of the unloading port passes through the filter screen 11, and then the solution enters the circulating water circuit from the bottom water outlet pipe 8. The solid particles are intercepted above the filter screen 11 by the filter screen 11. The filter screen 11 is arranged obliquely upward to facilitate the collection of solid impurities. One end of the filter screen 11 is fixed to the inner wall of the spray tower 1, and the other end is fixedly connected to the bottom of the baffle 6. The filter screen 11 can support the baffle 6 while collecting solid impurities, thereby enhancing the load-bearing capacity of the baffle 6. A blowdown port is arranged on the inner wall of the spray tower 1 on one side of the filter screen 11, and the blowdown port is provided with a blowdown valve 13. Opening the blowdown valve 13 can clean the solid impurities collected by the filter out of the spray tower 1.

[0031] In this embodiment, in order to facilitate processing and manufacturing, the tower body of the spray tower 1 is a cuboid structure.

[0032] The tail gas treatment device for crude white arsenic purification has the following advantages: first, the tail gas and the tail gas treatment liquid have various contact modes, which can directly contact through the immersion chamber 3, can be sprayed and contacted through the scattering spray head 10 and the atomizing spray head 5, and can be contacted through the overflow liquid surface above the baffle 6 and the overflow water curtain at the end, so that the tail gas is fully contacted with the tail gas treatment liquid and the tail gas treatment is ensured to be complete; second, the tail gas treatment liquid is used flexibly, which can reduce the waste consumption of the tail gas treatment liquid through the circulating water circuit, and can ensure the tail gas treatment effect of the tail gas treatment liquid through the direct supply of the external liquid storage tank 15; third, the solid-liquid-gas separation is convenient, and the solid impurities can be collected and separated through the unloading valve 12 and the blowdown valve 13. The water outlet pipe 8 is located at the bottom of the spray tower 1 to facilitate the collection of the solution for recycling, and the air outlet pipe 7 is located behind the overflow water curtain at the end of the baffle 6 to ensure that the gas discharged from the spray tower 1 does not have harmful substances.

[0033] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tail gas treatment device for purifying crude white arsenic, characterized in that, The utility model provides a tail gas treatment device, including spray tower (1), the upper portion of inside spray tower (1) is isolated by baffle (2) and places tail gas treatment liquid in the immersion chamber (3), the upper portion of spray tower (1) is connected with inlet pipe (4), and the end of inlet pipe (4) is funnel-shaped diffusion structure and extends into the bottom of immersion chamber (3); The inner wall of spray tower (1) on the outside of immersion chamber (3) is provided with a plurality of groups of atomizing nozzles (5) at intervals; The lower portion of atomizing nozzle (5) is fixed with baffle (6), and the other end of baffle (6) is not connected with the inner wall of spray tower (1), and the lower portion of baffle (6) is connected with outlet pipe (7); The lower portion of outlet pipe (7) is provided with water outlet pipe (8).

2. A tail gas treatment device for purification of crude white arsenic according to claim 1, characterized in that, Water outlet pipe (8) is circularly connected to the upper portion of spray tower (1) through booster pump (9), and the end of water outlet pipe (8) is provided with spray head (10), and spray head (10) is located above immersion chamber (3), and atomizing nozzle (5) is connected to circular water outlet pipe (8).

3. A tail gas treatment device for purification of crude white arsenic according to claim 2, characterized in that, Water outlet pipe (8) is connected to liquid storage tank (15) through tee joint (14), tail gas treatment liquid is stored in liquid storage tank (15), and on-off valve (16) is arranged on the outlet of liquid storage tank (15), and on-off valve (16) is arranged on water outlet pipe (8) in front of the connecting position of atomizing nozzle (5).

4. A tail gas treatment device for purification of crude white arsenic according to any one of claims 1 to 3, characterized in that, Baffle (6) is arranged to be inclined upward.

5. A tail gas treatment device for purification of crude white arsenic according to any one of claims 1-3, characterized in that, A through unloading port is formed in baffle (2), and the position of unloading port does not interfere with baffle (6) in the vertical direction, unloading valve (12) is arranged on unloading port, filter screen (11) is fixed at the bottom of spray tower (1), a blowdown port is formed in the inner wall of spray tower (1) on one side of filter screen (11), and blowdown valve (13) is arranged on blowdown port.

6. A tail gas treatment device for purification of crude white arsenic according to claim 5, characterized in that, Filter screen (11) is arranged to be inclined upward, one end of filter screen (11) is fixed to the inner wall of spray tower (1), and the other end is fixedly connected to the bottom of baffle (6).

7. A tail gas treatment device for purification of crude white arsenic according to any one of claims 1 to 3, characterized in that, The tower body of spray tower (1) is a cuboid.

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