A hydrogen sulfide gas treatment system after removing thallium from thallium-containing acid wastewater

Abstract

The utility model discloses a kind of hydrogen sulfide gas processing systems after thallium-containing acid wastewater thallium removal, comprising: reaction tank, further comprising: sealing cover, the sealing cover is located above reaction tank, for cover reaction tank to form airtight space above reaction tank, the side of the reaction tank is equipped with absorption tower, pipeline is equipped between the absorption tower and sealing cover, the pipeline is used to connect absorption tower and sealing cover, negative pressure fan is equipped on the pipeline, the negative pressure fan is used to suck the hydrogen sulfide gas in sealing cover into absorption tower, the side of the absorption tower is equipped with circulating spraying mechanism;The utility model can effectively remove the hydrogen sulfide gas generated in reaction tank, prevent its harm to environment and person, and the system removes hydrogen sulfide gas efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen sulfide gas treatment technology, specifically a hydrogen sulfide gas treatment system for thallium-containing acidic wastewater after thallium removal. Background Technology

[0002] A new waste acid treatment plant is planned, employing a two-stage sulfidation + lime neutralization process. After further arsenic removal with iron salts, sulfides will be added to remove thallium from the treated wastewater. The "Emission Standard of Pollutants for Inorganic Chemical Industry" (GB31573-2015), "Emission Standard of Water Pollutants for Iron and Steel Industry" (GB13456-2012), "Emission Standard of Pollutants for Sulfuric Acid Industry" (GB26132-2010), and "Emission Standard of Pollutants for Tin, Antimony and Mercury Industry" (GB30770-2014) all stipulate thallium emission limits for relevant industries. Some provinces have also established relevant industrial wastewater thallium emission standards, generally requiring a thallium emission limit of less than 5 μg / L. Based on the influent flow rate, if the thallium content is <100 μg / L, the dosage of thallium removal agent is 0.12%. If the thallium content is 100–200 μg / L, the dosage is 0.24%. For thallium concentrations of 200–300 μg / L, the dosage of thallium removal agent is 0.36%. For thallium concentrations of 300–400 μg / L, the dosage is 0.5%. For thallium concentrations of 400–500 mg / L, the dosage is 0.65%. This method allows wastewater to meet discharge standards for reuse. However, under acidic conditions, thallium removal using sulfides will produce harmful gases containing hydrogen sulfide. These gases are toxic and harmful to the environment and human health, requiring proper treatment. Summary of the Invention

[0003] The purpose of this invention is to solve the above problems by providing a hydrogen sulfide gas treatment system for thallium-containing acidic wastewater after thallium removal.

[0004] The specific solution of this utility model is: a hydrogen sulfide gas treatment system for thallium-containing acidic wastewater after thallium removal, comprising: a reaction tank, and further comprising: a sealing cover, the sealing cover being disposed above the reaction tank to cover the reaction tank and form a sealed space above the reaction tank; an absorption tower being disposed on one side of the reaction tank; a pipe being disposed between the absorption tower and the sealing cover, the pipe being used to connect the absorption tower and the sealing cover; a negative pressure fan being disposed on the pipe, the negative pressure fan being used to draw hydrogen sulfide gas from the sealing cover into the absorption tower; a circulating spray mechanism being disposed on one side of the absorption tower, the circulating spray mechanism comprising:

[0005] A circulation tank is located on one side of the absorption tower and contains liquid alkali. The upper part of the absorption tower is equipped with a spray nozzle, and a spray pipe is connected between the absorption tower and the circulation tank. One end of the spray pipe is connected to the spray nozzle, and the other end is connected to the circulation tank. A liquid alkali pump is installed on the spray pipe to pump the liquid alkali from the circulation tank into the spray nozzle for spraying. A circulation pipe is located at the lower part of the absorption tower, with the other end connected to the circulation tank. A circulation pump is installed on the circulation pipe to pump the liquid from the lower part of the absorption tower into the circulation tank.

[0006] Furthermore, the sealing cover is a fiberglass sealing cover.

[0007] Furthermore, the nozzle is an umbrella-shaped nozzle.

[0008] Furthermore, the absorption tower is provided with a packing layer located below the nozzle. The packing is polypropylene Pall ring packing, and the height of the packing layer is 1 / 2 to 2 / 3 of the internal height of the absorption tower.

[0009] Furthermore, a filter is provided on the circulation pipe, the filter is located between the bottom of the absorption tower and the circulation pump, and the filter accuracy is 50-100 mesh.

[0010] Furthermore, the bottom of the absorption tower is provided with a vent pipe, and a ball valve is provided on the vent pipe.

[0011] This invention has the following advantages: It has a simple structure and is easy to use. The hydrogen sulfide gas generated in the reaction tank is drawn into the absorption tower by a negative pressure fan. Then, the liquid alkali in the circulation tank is drawn into the nozzle for spray absorption. Finally, the liquid alkali after reaction absorption at the bottom of the absorption tower is drawn into the circulation tank through the circulation pipe at the bottom of the absorption tower. This system can effectively remove the hydrogen sulfide gas generated in the reaction tank, preventing it from causing harm to the environment and people. Moreover, this system has a high efficiency in removing hydrogen sulfide gas. Attached Figure Description

[0012] Figure 1 Structural principle diagram of this utility model;

[0013] 1. Reaction tank; 2. Sealing cover; 3. Pipeline; 4. Negative pressure fan; 5. Absorption tower; 6. Circulation tank; 7. Spray pipe; 8. Liquid alkali pump; 9. Spray head; 10. Circulation pump; 11. Circulation pipe; 12. Filter; 13. Vent pipe; 14. Ball valve; 15. Packing layer. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0016] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0017] See appendix for details Figure 1 A hydrogen sulfide gas treatment system for thallium-containing acidic wastewater after thallium removal includes: a reaction tank 1, and a sealing cover 2, wherein the sealing cover 2 is disposed above the reaction tank 1 to cover the reaction tank 1 and form a sealed space above the reaction tank 1. An absorption tower 5 is provided on one side of the reaction tank 1. A pipe 3 is provided between the absorption tower 5 and the sealing cover 2, the pipe 3 connecting the absorption tower 5 and the sealing cover 2. A negative pressure fan 4 is provided on the pipe 3 to draw hydrogen sulfide gas from the sealing cover 2 into the absorption tower 5. A circulating spray mechanism is provided on one side of the absorption tower 5, the circulating spray mechanism including:

[0018] A circulation tank 6 is located on one side of the absorption tower 5 and contains liquid alkali. A nozzle 9 is located at the top of the absorption tower 5, and a spray pipe 7 is located between the absorption tower 5 and the circulation tank 6. One end of the spray pipe 7 is connected to the nozzle 9, and the other end is connected to the circulation tank 6. A liquid alkali pump 8 is installed on the spray pipe 7 to pump the liquid alkali from the circulation tank 6 into the nozzle 9 for spraying. A circulation pipe 11 is located at the bottom of the absorption tower 5, and the other end of the circulation pipe 11 is connected to the circulation tank 6. A circulation pump 10 is installed on the circulation pipe 11 to pump the liquid from the bottom of the absorption tower 5 into the circulation tank 6.

[0019] In this embodiment, the sealing cover 2 is a fiberglass sealing cover 2.

[0020] In this embodiment, the nozzle 9 is an umbrella-shaped nozzle 9.

[0021] In this embodiment, the absorption tower 5 is provided with a packing layer 15, which is located below the nozzle 9. The packing is polypropylene Pall ring packing, and the height of the packing layer 15 is 1 / 2 to 2 / 3 of the internal height of the absorption tower 5.

[0022] In this embodiment, a filter 12 is provided on the circulation pipe 11. The filter 12 is located between the bottom of the absorption tower 5 and the circulation pump 10. The filtration accuracy of the filter 12 is 50-100 mesh.

[0023] In this embodiment, the bottom of the absorption tower 5 is provided with a vent pipe 13, and a ball valve 14 is provided on the vent pipe 13.

[0024] This invention has the following advantages: It has a simple structure and is easy to use. The hydrogen sulfide gas generated in the reaction tank 1 is drawn into the absorption tower 5 by the negative pressure fan 4, and the liquid alkali in the circulation tank 6 is drawn into the spray nozzle 9 for spray absorption. Then, the liquid alkali after reaction absorption at the bottom of the absorption tower 5 is drawn into the circulation tank 6 by the circulation pipe 11 at the bottom of the absorption tower 5. This system can effectively remove the hydrogen sulfide gas generated in the reaction tank 1, preventing it from causing harm to the environment and people. Moreover, this system has a high efficiency in removing hydrogen sulfide gas.

Claims

1. A hydrogen sulfide gas treatment system for thallium-containing acidic wastewater after thallium removal, comprising: The reaction tank, characterized in that it further includes: a sealing cover, the sealing cover being disposed above the reaction tank for covering the reaction tank to form a sealed space above the reaction tank; an absorption tower being disposed on one side of the reaction tank; a pipe being disposed between the absorption tower and the sealing cover; the pipe being used to connect the absorption tower and the sealing cover; a negative pressure fan being disposed on the pipe; the negative pressure fan being used to draw hydrogen sulfide gas from the sealing cover into the absorption tower; and a circulating spray mechanism being disposed on one side of the absorption tower, the circulating spray mechanism including: A circulation tank is located on one side of the absorption tower and contains liquid alkali. The upper part of the absorption tower is equipped with a spray nozzle, and a spray pipe is connected between the absorption tower and the circulation tank. One end of the spray pipe is connected to the spray nozzle, and the other end is connected to the circulation tank. A liquid alkali pump is installed on the spray pipe to pump the liquid alkali from the circulation tank into the spray nozzle for spraying. A circulation pipe is located at the lower part of the absorption tower, with the other end connected to the circulation tank. A circulation pump is installed on the circulation pipe to pump the liquid from the lower part of the absorption tower into the circulation tank.

2. The hydrogen sulfide gas treatment system for thallium-containing acidic wastewater after thallium removal according to claim 1, characterized in that, The sealing cover is a fiberglass sealing cover.

3. The hydrogen sulfide gas treatment system for thallium-containing acidic wastewater after thallium removal according to claim 1, characterized in that, The nozzle is an umbrella-shaped nozzle.

4. The hydrogen sulfide gas treatment system for thallium-containing acidic wastewater after thallium removal according to claim 1, characterized in that, The absorption tower is equipped with a packing layer located below the nozzle. The packing is polypropylene Pall ring packing, and the height of the packing layer is 1 / 2 to 2 / 3 of the internal height of the absorption tower.

5. The hydrogen sulfide gas treatment system for thallium-containing acidic wastewater after thallium removal according to claim 1, characterized in that, The circulation pipe is equipped with a filter, which is located between the bottom of the absorption tower and the circulation pump. The filter has a filtration accuracy of 50-100 mesh.

6. The hydrogen sulfide gas treatment system for thallium-containing acidic wastewater after thallium removal according to claim 1, characterized in that, The bottom of the absorption tower is equipped with a vent pipe, and a ball valve is installed on the vent pipe.

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