A sulfurization reactor for acidic wastewater treatment

Abstract

The present invention belongs to the technical field of wastewater treatment, and specifically is an acid wastewater treatment vulcanization reactor, comprising a reactor shell (1) and a head (2) sealed together; a vent (3) is arranged at the bottom of the reactor shell (1), and a plurality of dosing ports (4) are evenly arranged; a manhole (5) and a sight glass (6) are also arranged on the reactor shell (1); a plurality of water inlet pipes (7) are evenly distributed on the head (2), and a dosing branch pipe (8) is arranged on the inlet side of any water inlet pipe (7); a water outlet (9) is arranged on the side of the head (2), and the water outlet is externally connected to a U-shaped pipe, and an air inlet (10) and an air exhaust port (11) are also arranged on the head (2); the number of the dosing ports (4) is the same as the number of the water inlet pipes (7); the outlet of the water inlet pipe (7) has the same elevation as the dosing port, and the outlet of the water inlet pipe (7) corresponds to the dosing port one by one. The reactor has good sealing performance and high utilization efficiency of the vulcanizing agent in the vulcanization reaction.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, in particular to a sulfurization reactor for treating acidic wastewater. Background Art

[0002] During the mining and smelting of non-ferrous metals, some acidic heavy metal wastewater is often produced. For the mining process, sulfide ores account for a very large proportion. During the mining process of this type of ore, in mine waste rock yards, mine pits, etc., under the influence of various external factors, a part of the sulfide ores will be oxidized and decomposed into nearby water bodies, forming acidic wastewater. This type of acidic wastewater contains a large amount of heavy metals (the types of heavy metals are different depending on the type of ore, and some contain some valuable metals such as copper), and the pH is low, and the amount of water is often relatively large. For the smelting process, part of the sulfur and metals in the sulfide ore enter the flue gas and are then absorbed, and finally produce polluted acid wastewater, which is characterized by high sulfuric acid acidity, high arsenic concentration, and a large number of other heavy metals. The treatment process of these two types of wastewater often adds a sulfidation process. The sulfidation method has a very good effect on the removal of arsenic from wastewater and the recovery of valuable metals. The sulfide precipitates (arsenic sulfide, copper sulfide, etc.) have a low solubility product and are easy to precipitate and separate. However, during the sulfidation reaction, S 2- Under acidic conditions, it is easy to bind H + Generate H 2 S gas and sulfiding agent utilization rate are not high, which increases the processing cost, and the concentration of hydrogen sulfide is a toxic and flammable gas, which poses a major safety hazard.

[0003] Most of the existing sulfidation reaction devices are roughly designed, and most of them are circular stirring tanks with a sealing cover plate set on the tank body. The tank body is equipped with a dosing pipe, a water inlet pipe and an exhaust pipe. The dosing method is rough, and a large amount of hydrogen sulfide gas is generated, which poses a great safety hazard. The utilization rate of the sulfiding agent is not high, and the processing cost is high.

[0004] Chinese utility model patent CN209917643U discloses a gas-liquid mixing device, in which hydrogen sulfide gas is used to react with acidic wastewater, and a gas-liquid mixer is used to mix hydrogen sulfide into wastewater before entering the reactor for reaction. However, considering the hydrolysis equilibrium and the low solubility of hydrogen sulfide gas in wastewater, hydrogen sulfide is difficult to dissolve in acidic wastewater and release sulfur ions, and the reaction efficiency is much lower than that of adding sulfide reagent solution. In addition, the use of hydrogen sulfide gas at the front end has much higher safety requirements and many disadvantages. Summary of the invention

[0005] The purpose of the present invention is to provide a high-efficiency sulfurization reactor for treating acid wastewater from mines and smelters, the reactor has good sealing performance, high safety performance and high utilization efficiency of sulfurizing agents in the sulfurization reaction.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A sulfurization reactor for treating acidic wastewater, comprising a reactor shell and a head sealed together;

[0008] The bottom of the reactor shell is provided with a venting port, and a plurality of dosing ports are evenly arranged; the reactor shell is also provided with a manhole and a sight glass;

[0009] A plurality of water inlet pipes are evenly distributed on the sealing head, and a dosing branch pipe is arranged on the inlet side of any water inlet pipe; a water outlet is arranged at the bottom of the side of the sealing head, and an air inlet and an air exhaust port are also arranged on the sealing head;

[0010] The number of the dosing ports is the same as the number of the water inlet pipes; the outlet of the water inlet pipe is at the same elevation as the dosing port, and the outlet of the water inlet pipe corresponds to the dosing port one by one. The elevation in the present invention can be the bottom surface of the reactor shell as the reference surface.

[0011] Furthermore, a stirrer is arranged at the center of the end cap, and a stirring paddle of the stirrer is on the central axis of the reactor shell. The position of the stirring paddle can also be at the same elevation as the position of the dosing port, so as to achieve a better mixing effect when the dosing port is adding drugs and when the acidic wastewater enters the reactor.

[0012] In the present invention, the water outlet is externally connected to a U-shaped pipe.

[0013] In the present invention, the distance between the dosing port and the bottom surface of the reactor shell is 200-400 mm.

[0014] In the present invention, the number of the drug adding ports is four, and the number of the water inlet pipes is four.

[0015] In the present invention, an air path one-way valve is arranged on the air inlet.

[0016] In the present invention, an instrument installation port is also provided on the sealing head.

[0017] The vulcanization reactor of the present invention comprises a reactor shell, a sealing head and a stirrer. A manhole is arranged at the bottom of the reactor shell, a water outlet is arranged at the bottom of the sealing head on the other side of the manhole, and an external pipe of the water outlet adopts a U-shaped pipe design to play a water seal role, thereby preventing hydrogen sulfide gas from entering the next-stage reactor from the water outlet pipeline; a vent is arranged at the bottom of the reactor shell, and four dosing ports are arranged on the reactor shell at 45 degrees on both sides of the manhole and the water outlet, the dosing ports are 200-400 mm away from the bottom of the shell, and two sight glasses are arranged up and down at 22.5 degrees on one side of the manhole. The end cap is welded and sealed with the reactor shell, and a stirrer is arranged at the center of the end cap; 4 water inlet pipes are arranged above the end cap on the same side as the dosing port, and the 4 water inlet pipes are at the same distance from the center of the end cap. The water inlet pipes are inserted into the end cap and extend downward, and the outlet end of the water inlet pipe is 200-400mm away from the bottom of the reactor shell, and the same elevation is maintained as the dosing port. A dosing branch pipe is arranged on the inlet side of each water inlet pipe, and the sulfiding agent can be added to the water inlet pipe from the dosing branch pipe, mixed with wastewater and enter the reactor. The upper end dosing (dosing by the dosing branch pipe) and the lower end dosing (dosing by the dosing port) can be carried out at the same time. The present invention uses more dosing points to help the utilization rate of the sulfiding agent, and can also only dosing from the lower end dosing port. When the lower end dosing port is blocked by more sediment, the upper end dosing port is left to ensure normal dosing, and the reaction continues, and the sulfiding agent still has a high utilization rate.

[0018] An exhaust port is set at a 45° angle on one side of the dosing port, and an air inlet is set at the same radius as the exhaust port on the opposite side of the exhaust port. A gas path one-way valve is set at the upper end of the air inlet to avoid H 2 S gas escapes. An instrument installation port is set at 45° on the other side.

[0019] The water inlet, dosing port, air extraction port, instrument installation port, etc. of the present invention are all provided with flanges for easy connection with external pipelines. If the processing scale is increased, the reactor can be enlarged accordingly according to the reaction time, and multiple (not limited to 4) dosing ports and water inlet pipes or water inlets can be symmetrically and evenly arranged.

[0020] The present invention can be configured into reactors of different sizes according to the amount of water to be treated to match the treatment scale, and multiple dosing ports and water inlet pipes can be further configured according to the size of the reactor, not limited to the 4 described in the text. The housing of the device of the present invention adopts the form of a reactor, which is easy to manufacture and seal, and can withstand a certain pressure. The device of the present invention adopts top water inlet, the water inlet pipe extends into the bottom of the reactor, and the four water inlet pipe interfaces are directly opposite to the four sulfide agent dosing ports, which can ensure that the agent can contact the wastewater before the reaction as soon as possible when added into the reactor, and react with the high copper or high arsenic ions of the raw water, so as to achieve a higher utilization rate of the sulfide agent. At the same time, the upper water inlet pipe is provided with a dosing port branch, which can make the agent directly pre-mixed with the original wastewater, improve the utilization rate, and also avoid the reaction not being able to proceed normally when the lower dosing port is blocked. The multi-point dosing mode and the bottom water inlet dosing can make the dosing become a multi-point small flow dosing, reducing the generation of hydrogen sulfide. Secondly, the generated hydrogen sulfide stays in the water for a longer time, and is easier to dissolve in the water and react with the metal again, reducing the escape of hydrogen sulfide gas from the water. The present invention is provided with a manhole and a sight glass for easy maintenance and observation. The reactor agitator motor is placed on the top, and the agitator shaft and the head connection port are sealed and disposed to be as airtight as possible. The instrument installation port can be installed with devices such as an ORP detector or a pH meter. An exhaust port is arranged on the top of the reactor head, and an air inlet is arranged on the opposite side of the exhaust port. Air is exhausted at the exhaust port by a fan. The air inlet is kept connected with the outside air during exhaustion, so that a negative pressure state is maintained above the liquid level in the reactor cavity, further ensuring that even if there are gaps in other sealing parts, no hydrogen sulfide gas will overflow. The extracted hydrogen sulfide gas can be added back into the reaction as a sulfiding agent after being absorbed by the alkali solution, thereby ensuring the utilization rate of the sulfiding agent.

[0021] The present invention improves the utilization rate of the sulfiding agent directly added by designing the reactor. In the overall process, the sodium sulfide generated after the hydrogen sulfide is absorbed by the alkali solution will be recycled and added to the reaction as the sulfiding agent, and the overall utilization rate of the sulfiding agent will be very high.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention can reduce the generation of hydrogen sulfide, prevent the overflow of hydrogen sulfide gas, and the utilization rate of the sulfiding agent can reach more than 99%;

[0024] 2. The present invention is easy to manufacture and seal, has a simple structure, and is convenient for maintenance and observation;

[0025] 3. The present invention can be configured into reactors of different sizes according to the amount of water to be treated to match the treatment scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view structural schematic diagram of the vulcanization reactor of the present invention;

[0027] Figure 2 It is a schematic diagram of the top view of the structure of the vulcanization reactor of the present invention;

[0028] Reference numerals: reactor shell 1; end cap 2; vent port 3; dosing port 4; manhole 5; sight glass 6; water inlet pipe 7; dosing branch pipe 8; water outlet 9; air inlet 10; exhaust port 11; agitator 12; instrument installation port 13. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] like Figure 1-2 As shown, a sulfurization reactor for treating acidic wastewater comprises a reactor shell 1 and a head 2 sealed together;

[0032] The bottom of the reactor shell 1 is provided with a venting port 3, and four dosing ports 4 are evenly arranged; the reactor shell 1 is also provided with a manhole 5 and a sight glass 6;

[0033] Four water inlet pipes 7 are evenly distributed on the sealing head 2, and a dosing branch pipe 8 is arranged on the inlet side of any water inlet pipe 7; a water outlet 9 is arranged at the bottom of the side of the sealing head 2, and an air inlet 10 and an air exhaust port 11 are also arranged on the sealing head 2;

[0034] The number of the dosing ports 4 is the same as the number of the water inlet pipes 7; the outlets of the water inlet pipes 7 are at the same elevation as the dosing ports, and the outlets of the water inlet pipes 7 correspond one to one to the dosing ports.

[0035] A stirrer 12 is arranged at the center of the end cap 2, and a stirring blade of the stirrer 12 is on the central axis of the reactor shell 1. The water outlet 9 is externally connected to a U-shaped pipe.

[0036] The distance between the dosing port 4 and the bottom surface of the reactor shell 1 is 200-400 mm. The distance between the outlet of the water inlet pipe 7 and the bottom surface of the reactor shell 1 is 200-400 mm.

[0037] An air path one-way valve is arranged on the air inlet.

[0038] The sealing head 2 is also provided with an instrument installation port 13 for installing an ORP detector or a pH meter and the like.

[0039] The water inlet pipe, the medicine adding port, the air extraction port, the instrument installation port and the like of the present invention are all provided with flanges for easy connection with external pipelines.

[0040] The upper and lower limits of the reactor technical parameter range and the range values ​​of the present invention can realize the present invention, and the embodiments are not listed one by one here.

[0041] Any contents not described in detail in the present invention can be based on the conventional technical knowledge in the art.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention and should be included in the scope of the claims of the present invention.

Claims

1. A sulfidation reactor for treating acidic wastewater, comprising a reactor shell (1) and a sealing head (2) sealed together; It is characterized in that The bottom of the reactor shell (1) is provided with a venting port (3), and a plurality of drug adding ports (4) are evenly arranged; the reactor shell (1) is also provided with a manhole (5) and a sight glass (6); A plurality of water inlet pipes (7) are evenly distributed on the sealing head (2), and a dosing branch pipe (8) is arranged on the inlet side of any water inlet pipe (7); a water outlet (9) is arranged on the side of the sealing head (2), and an air inlet (10) and an air exhaust port (11) are also arranged on the sealing head (2); The number of the dosing ports (4) is the same as the number of the water inlet pipes (7); the outlet of the water inlet pipe (7) and the dosing port have the same elevation, and the outlet of the water inlet pipe (7) corresponds to the dosing port one by one; An exhaust port is arranged at a 45° angle on one side of the dosing port, and an air inlet is arranged on the opposite side of the exhaust port at the same radial distance as the exhaust port.

2. The acidic wastewater treatment sulfidation reactor according to claim 1, characterized in that: A stirrer (12) is arranged at the center of the end cap (2), and a stirring paddle of the stirrer (12) is on the central axis of the reactor shell (1).

3. The acidic wastewater treatment sulfidation reactor according to claim 1, characterized in that: The water outlet (9) is externally connected to a U-shaped pipe.

4. The acidic wastewater treatment sulfidation reactor according to claim 1, characterized in that: The distance between the drug addition port (4) and the bottom surface of the reactor shell (1) is 200-400 mm.

5. The acidic wastewater treatment sulfidation reactor according to claim 1, characterized in that: The number of the dosing ports is four, and the number of the corresponding water inlet pipes is four.

6. The acidic wastewater treatment sulfidation reactor according to claim 1, characterized in that: An air path one-way valve is arranged on the air inlet.

7. The acidic wastewater treatment sulfidation reactor according to any one of claims 1 to 6, characterized in that: The sealing head (2) is also provided with an instrument installation opening (13).

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