A dual-material neutralization reaction device for acidic wastewater and its usage method

Abstract

This invention relates to the field of pyrometallurgical production technology, specifically to a dual-material neutralization reaction device for acidic wastewater and its usage method. This addresses the problem that in the neutralization treatment of acidic wastewater generated during pyrometallurgical production, the lack of an efficient neutralization reaction device often leads to insufficient reaction between the neutralizing agent and the acidic wastewater, and low utilization of the neutralizing agent. Ultimately, this results in a significant impact on the overall neutralization treatment effect when the sulfuric acid content in the acidic wastewater fluctuates greatly. The device mainly consists of a reaction cylinder, neutralization pipelines, regulating valves, a pH meter, and a flow meter. By installing dual-material neutralization pipelines and regulating valves on the reaction cylinder, efficient reaction between the neutralizing agents such as calcium carbide slag slurry and lime slurry and the wastewater is effectively ensured. Furthermore, the inclusion of an emergency neutralization pipeline prevents the acidic wastewater reaction from stalling due to pipeline damage, thus avoiding impact on the overall wastewater treatment efficiency and greatly improving the neutralization treatment effect of acidic wastewater.

Description

Technical Field

[0001] This invention relates to the field of pyrometallurgical production technology, specifically to a dual-material neutralization reaction device for acidic wastewater and its usage method. Background Technology

[0002] In pyrometallurgical processes, large quantities of acidic wastewater are typically generated. This wastewater is generally treated using neutralization, which involves adding neutralizing agents to neutralize the sulfuric acid and produce neutral water. However, in conventional neutralization processes, both the acidic wastewater and the neutralizing agent are added from the top of the reaction tank and overflow from the top. This results in a short neutralization reaction time within the tank, with some neutralizing agent being discharged unreacted, leading to low neutralization efficiency. Furthermore, in cases of incomplete neutralization and significant fluctuations in the sulfuric acid content of the wastewater, especially at high acidity levels, the addition and reaction of the neutralizing agent can be insufficient. Ultimately, this can significantly impact the control of process parameters for acidic wastewater neutralization, resulting in poor overall treatment efficiency for acidic wastewater in pyrometallurgical production. Summary of the Invention

[0003] This invention provides a dual-material neutralization reaction device for acidic wastewater and its usage method, in order to solve the problem of low neutralizing agent reaction efficiency in the above-mentioned background.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A two-material neutralization reaction device for acidic wastewater includes a reaction cylinder, an inlet at the bottom of the reaction cylinder connected to an inlet pipe, a stirring paddle inside the reaction cylinder, a degassing pipe at the top of the reaction cylinder, a first neutralization pipe connected to the inlet pipe, and an outlet pipe at the top of the reaction cylinder.

[0006] Furthermore, a second neutralization pipe is provided on the bottom side of the reaction cylinder, and an emergency neutralization pipe is also connected to the top of the reaction cylinder.

[0007] Furthermore, the inlet pipe is provided with a flow meter, an inlet check valve, and an inlet regulating valve in sequence along the inlet direction, and the flow meter and the inlet regulating valve are interlocked.

[0008] Furthermore, the first neutralization tube is provided with a first neutralization check valve and a first neutralization regulating valve in sequence along the liquid inlet direction, the second neutralization tube is provided with a second neutralization regulating valve, the emergency neutralization tube is provided with an emergency neutralization regulating valve, and the liquid outlet tube is provided with a pH meter, and the pH meter, the second neutralization regulating valve, the emergency neutralization regulating valve and the first neutralization regulating valve are all interlocked.

[0009] Furthermore, the interior of the reaction cylinder is provided with multiple baffles evenly distributed along the circumference.

[0010] Furthermore, the liquid inlet is also connected to a drain pipe, and the drain pipe is equipped with a drain valve.

[0011] This invention also discloses a method for using a dual-material neutralization reaction device for acidic wastewater, which includes the following steps when the sulfuric acid concentration in the acidic wastewater is <5%:

[0012] Step 1: Pump the acidic wastewater into the reaction cylinder through the inlet pipe, and open the inlet regulating valve to control the flow rate of the acidic wastewater entering the reaction cylinder.

[0013] Step 2: Pump the calcium carbide slag slurry into the reaction cylinder through the first neutralization pipe, and open the first neutralization regulating valve to control the flow rate of the calcium carbide slag slurry entering the reaction cylinder.

[0014] Step 3: Start the agitator to fully mix the acidic wastewater and carbide slag slurry. The mixture forms a vortex as it passes through the baffle. At the same time, open the degassing pipe to remove the hot steam generated during the neutralization reaction.

[0015] Step 4: After the pH of the reaction mixture is measured to be 5-7 using a pH meter, open the outlet tube to discharge the reaction mixture into the reaction liquid storage device.

[0016] A method for using a dual-material neutralization reaction device for acidic wastewater, when the sulfuric acid concentration in the acidic wastewater is 5%-15%, includes the following steps:

[0017] Step 1: Pump the acidic wastewater into the reaction cylinder through the inlet pipe, and open the inlet regulating valve to control the flow rate of the acidic wastewater entering the reaction cylinder.

[0018] Step 2: Pump the calcium carbide slag slurry into the reaction cylinder through the first neutralization pipe, and open the first neutralization regulating valve to control the flow rate of the calcium carbide slag slurry entering the reaction cylinder.

[0019] Step 3: Pump the lime slurry into the reaction cylinder through the second neutralization pipe, and open the second neutralization regulating valve to control the flow rate of lime slurry entering the reaction cylinder.

[0020] Step 4: Start the agitator to thoroughly mix the acidic wastewater, carbide slag slurry, and lime slurry. The mixture forms a vortex as it passes through the baffle. At the same time, open the degassing pipe to remove the hot steam generated during the neutralization reaction.

[0021] Step 5: After the pH of the reaction mixture is measured to be 5-7 using a pH meter, open the outlet tube to discharge the reaction mixture into the reaction liquid storage device.

[0022] Furthermore, when the sulfuric acid concentration in the acidic wastewater is <5% and the first neutralization pipe malfunctions, the following steps are included:

[0023] Step 1: The first neutralization regulating valve feeds back the fault signal of the first neutralization pipe to the emergency neutralization regulating valve. The emergency neutralization regulating valve opens the emergency neutralization pipe and pumps the carbide slag slurry into the interior of the reaction cylinder through the emergency neutralization pipe. The flow rate of the carbide slag slurry entering the reaction cylinder is controlled by the emergency neutralization regulating valve.

[0024] Step 2: Under the stirring action of the agitator, the mixture of acidic wastewater and carbide slag slurry is thoroughly stirred and homogenized. The mixture forms a vortex through the baffle plate, and at the same time, the degassing pipe removes the hot steam generated during the neutralization reaction.

[0025] Step 3: After the pH of the reaction mixture is measured to be 5-7 using a pH meter, open the outlet tube and discharge the reaction mixture into the reaction liquid storage device.

[0026] When the sulfuric acid concentration in the acidic wastewater is 5%-15% and either the first or second neutralization pipe malfunctions, the following steps are included:

[0027] Step 1: The first or second neutralization regulating valve feeds back the fault signal of the first or second neutralization pipe to the emergency neutralization regulating valve. The emergency neutralization regulating valve opens the emergency neutralization pipe and pumps the carbide slag slurry or lime slurry into the interior of the reaction cylinder through the emergency neutralization pipe. The flow rate of the carbide slag slurry or lime slurry entering the reaction cylinder is controlled by the emergency neutralization regulating valve.

[0028] Step 2: Under the stirring action of the agitator, the mixture of acidic wastewater, carbide slag slurry and lime slurry is thoroughly stirred and homogenized. The mixture forms a vortex through the baffle plate, and at the same time, the degassing pipe removes the hot steam generated during the neutralization reaction.

[0029] Step 3: After the pH of the reaction mixture is measured to be 5-7 using a pH meter, open the outlet tube and discharge the reaction mixture into the reaction liquid storage device.

[0030] The present invention has the following beneficial effects:

[0031] This invention provides a dual-material neutralization reaction device for acidic wastewater, mainly composed of a reaction cylinder, neutralization pipeline, regulating valve, check valve, pH meter, and flow meter. By installing a dual-material neutralization pipeline and regulating valve on the reaction cylinder, the efficient reaction of neutralizing agents such as calcium carbide slag slurry and lime slurry with acidic wastewater is effectively ensured. The addition of an emergency neutralization pipeline prevents the acidic wastewater reaction from stalling due to pipeline damage, thus affecting the overall wastewater treatment efficiency. It also extends the neutralization reaction time, enabling the neutralization reaction to adapt to unstable water conditions with both high and low acidity, greatly improving the neutralization effect of acidic wastewater. This solves the problem that currently, in the neutralization treatment of acidic wastewater generated from pyrometallurgical production, the lack of dedicated and efficient neutralization reaction devices often leads to insufficient reaction between the neutralizing agent and acidic wastewater, low utilization of the neutralizing agent, and ultimately, significant fluctuations in the sulfuric acid content of the acidic wastewater, which greatly affect the overall neutralization effect.

[0032] In this invention, the first neutralization tube is located at the bottom inlet of the reaction cylinder, and the second neutralization tube is located on the bottom side of the reaction cylinder. This arrangement effectively ensures that the neutralizing agent and acidic wastewater are stirred and mixed from low to high within the reaction cylinder, thereby greatly improving the adequacy of the neutralization reaction.

[0033] The liquid inlet pipe of this invention is equipped with a liquid inlet check valve to prevent backflow of liquid in the reaction cylinder when the acidic wastewater flow rate is low or the acidic wastewater pump stops. The first neutralization pipe is equipped with a first neutralization check valve to effectively prevent backflow of liquid in the reaction cylinder when the calcium carbide slag slurry dosage is low or the calcium carbide slag slurry pump stops, thereby improving the safety of the neutralization reaction device.

[0034] The top of the reaction cylinder in this invention is equipped with a degassing pipe, which can draw out the reaction hot vapor generated inside the reaction cylinder through an induced draft fan, remove the hot steam generated during the neutralization process, and thus improve the overall safety of the neutralization reaction process.

[0035] In this invention, when the reaction vessel malfunctions, the drain valve can be opened in time, allowing the liquid inside the reaction vessel to be discharged through the drain pipe. This facilitates timely maintenance of the reaction vessel by operators, thereby improving the overall efficiency of acidic wastewater neutralization treatment. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0037] The meanings of the reference numerals in the attached figures are as follows:

[0038] 1. Reaction cylinder; 2. Stirring paddle; 3. Baffle plate; 4. Inlet pipe; 5. Outlet pipe; 6. First neutralization pipe; 7. Second neutralization pipe; 8. Emergency neutralization pipe; 9. Degassing pipe; 10. Drain pipe; 11. Inlet regulating valve; 12. Inlet check valve; 13. First neutralization regulating valve; 14. First neutralization check valve; 15. Second neutralization regulating valve; 16. Emergency neutralization regulating valve; 17. Drain valve; 18. pH meter; 19. Flow meter; 20. Inlet. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1 As shown, an acidic wastewater dual-material neutralization reaction device includes a reaction cylinder 1, an inlet 20 installed at the bottom of the reaction cylinder 1, an inlet pipe 4 welded to the inlet 20, a stirring paddle 2 installed inside the reaction cylinder 1, a degassing pipe 9 installed at the top of the reaction cylinder 1, a first neutralization pipe 6 welded to the inlet pipe 4, and an outlet pipe 5 installed at the top of the reaction cylinder 1.

[0041] A second neutralization pipe 7 is welded to the bottom side of the reaction cylinder 1, and an emergency neutralization pipe 8 is also installed on the top of the reaction cylinder 1.

[0042] The inlet pipe 4 is equipped with a flow meter 19, an inlet check valve 12 and an inlet regulating valve 11 in sequence along the inlet direction. The flow meter 19 and the inlet regulating valve 11 are interlocked.

[0043] The first neutralization pipe 6 is equipped with a first neutralization check valve 14 and a first neutralization regulating valve 13 in sequence along the liquid inlet direction. The second neutralization pipe 7 is equipped with a second neutralization regulating valve 15. The emergency neutralization pipe 8 is equipped with an emergency neutralization regulating valve 16. The liquid outlet pipe 5 is equipped with a pH meter 18, and the pH meter 18 is interlocked with the second neutralization regulating valve 15, the emergency neutralization regulating valve 16, and the first neutralization regulating valve 13.

[0044] Multiple baffles 3 are evenly welded around the inside of the reaction cylinder 1. The liquid inlet 20 is also welded to a drain pipe 10, and a drain valve 17 is installed on the drain pipe 10.

[0045] The first neutralization regulating valve, the second neutralization regulating valve, the emergency neutralization regulating valve, and the inlet regulating valve are all of model ZSWXF-25K. The inlet check valve is model H41F46-10C-150. The flow meter is model FM590 / RN-150 / RP / Ta / ES / AC / B. The first neutralization check valve is model H41F46-10C-100. The pH meter is model CPS71D-7TC21. The drain valve is model D341F46-10C-200.

[0046] A method for using a dual-material neutralization reaction device for acidic wastewater, when the sulfuric acid concentration in the acidic wastewater is <5%, includes the following steps:

[0047] Step 1: Pump the acidic wastewater into the reaction cylinder 1 through the inlet pipe 4, and open the inlet regulating valve 11 to control the flow rate of the acidic wastewater entering the reaction cylinder 1.

[0048] Step 2: Pump the calcium carbide slag slurry into the reaction cylinder 1 through the first neutralization pipe 6, and open the first neutralization regulating valve 13 to control the flow rate of the calcium carbide slag slurry entering the reaction cylinder 1.

[0049] Step 3: Start the agitator 2 to fully mix the acidic wastewater and carbide slag slurry. The mixture forms a vortex through the baffle 3. At the same time, open the degassing pipe 9 to remove the hot steam generated during the neutralization reaction.

[0050] Step 4: After the pH of the reaction mixture is measured to be 7 using pH meter 18, open the outlet pipe 5 to discharge the reaction mixture into the reaction liquid storage device.

[0051] A method for using a dual-material neutralization reaction device for acidic wastewater, when the sulfuric acid concentration in the acidic wastewater is 5%-15%, includes the following steps:

[0052] Step 1: Pump the acidic wastewater into the reaction cylinder 1 through the inlet pipe 4, and open the inlet regulating valve 11 to control the flow rate of the acidic wastewater entering the reaction cylinder 1.

[0053] Step 2: Pump the calcium carbide slag slurry into the reaction cylinder 1 through the first neutralization pipe 6, and open the first neutralization regulating valve 13 to control the flow rate of the calcium carbide slag slurry entering the reaction cylinder 1.

[0054] Step 3: Pump the lime slurry into the reaction cylinder 1 through the second neutralization pipe 7, and open the second neutralization regulating valve 15 to control the flow rate of lime slurry entering the reaction cylinder 1.

[0055] Step 4: Start the agitator 2 to fully mix the acidic wastewater, carbide slag slurry and lime slurry. The mixture forms a vortex through the baffle 3. At the same time, open the degassing pipe 9 to remove the hot steam generated during the neutralization reaction.

[0056] Step 5: After the pH of the reaction mixture is measured to be 7 using pH meter 18, open the outlet pipe 5 to discharge the reaction mixture into the reaction liquid storage device.

[0057] When the sulfuric acid concentration in the acidic wastewater is <5% and the first neutralization pipe 6 malfunctions, the following steps are included:

[0058] Step 1: The first neutralization regulating valve 13 feeds back the fault signal of the first neutralization pipe 6 to the emergency neutralization regulating valve 16. The emergency neutralization regulating valve 16 opens the emergency neutralization pipe 8 and pumps the carbide slag slurry into the interior of the reaction cylinder 1 through the emergency neutralization pipe 8. The flow rate of the carbide slag slurry entering the reaction cylinder 1 is controlled by the emergency neutralization regulating valve 16.

[0059] Step 2: Under the stirring action of the agitator 2, the mixture of acidic wastewater and carbide slag slurry is thoroughly stirred and homogenized. The mixture forms a vortex through the baffle 3, while the degassing pipe 9 removes the hot steam generated during the neutralization reaction.

[0060] Step 3: After the pH of the reaction mixture is measured to be 7 using pH meter 18, open the outlet pipe 5 to discharge the reaction mixture into the reaction liquid storage device.

[0061] When the sulfuric acid concentration in the acidic wastewater is 5%-15% and either the first neutralization pipe 6 or the second neutralization pipe 7 malfunctions, the following steps are included:

[0062] Step 1: The first neutralization regulating valve 13 or the second neutralization regulating valve 15 feeds back the fault signal of the first neutralization pipe 6 or the second neutralization pipe 7 to the emergency neutralization regulating valve 16. The emergency neutralization regulating valve 16 opens the emergency neutralization pipe 8 and pumps the carbide slag slurry or lime slurry into the interior of the reaction cylinder 1 through the emergency neutralization pipe 8. The flow rate of the carbide slag slurry or lime slurry entering the reaction cylinder 1 is controlled by the emergency neutralization regulating valve 16.

[0063] Step 2: Under the stirring action of the agitator 2, the mixture of acidic wastewater, carbide slag slurry and lime slurry is thoroughly stirred and homogenized. The mixture forms a vortex through the baffle 3, and at the same time, the degassing pipe 9 removes the hot steam generated during the neutralization reaction.

[0064] Step 3: After the pH of the reaction mixture is measured to be 7 using pH meter 18, open the outlet pipe 5 to discharge the reaction mixture into the reaction liquid storage device.

[0065] Table 1. Comparison of neutralization effects between existing neutralization reaction devices and the reaction device of this application.

[0066]

[0067] Analysis of the neutralization effect of existing neutralization processes and the reaction device of this application on acidic wastewater revealed that, under the condition that the flow rate of acidic wastewater entering the reaction cylinder 1 and the neutralization reaction time remain unchanged, the pH of the mixed liquid after neutralization reaction using this device is 7.08 and 7.34, which is significantly higher than the pH of 0.15 and 3.81 obtained by existing neutralization processes. At the same time, under high acid conditions, by adding a dual neutralizing agent of carbide slag slurry and lime milk to the reaction cylinder 1, the pH of the mixed liquid after neutralization reaction is 7.08, which is closer to neutrality. Therefore, a better acidic wastewater treatment effect can be achieved through the dual-material neutralization reaction.

Claims

1. A method of using a dual-material neutralization reaction device for acidic wastewater, the dual-material neutralization reaction device for acidic wastewater includes a reaction cylinder (1), a liquid inlet (20) is provided at the bottom of the reaction cylinder (1), the liquid inlet (20) is connected to a liquid inlet pipe (4), a stirring paddle (2) is provided inside the reaction cylinder (1), a second neutralization pipe (7) is provided on the bottom side of the reaction cylinder (1), an emergency neutralization pipe (8) is also connected to the top of the reaction cylinder (1), and a degassing pipe (9) is provided at the top of the reaction cylinder (1), characterized in that: The inlet pipe (4) is connected to the first neutralization pipe (6). Multiple baffles (3) are evenly distributed around the inside of the reaction cylinder (1). The top of the reaction cylinder (1) is also provided with an outlet pipe (5). The inlet pipe (4) is provided with a flow meter (19), an inlet check valve (12) and an inlet regulating valve (11) in sequence along the inlet direction. The flow meter (19) and the inlet regulating valve (11) are interlocked. The first neutralization pipe (6) is provided with a first neutralization check valve (14) and a first neutralization regulating valve (13) in sequence along the inlet direction. The second neutralization pipe (7) is provided with a second neutralization regulating valve (15). The emergency neutralization pipe (8) is provided with an emergency neutralization regulating valve (16). The outlet pipe (5) is provided with a pH meter (18). The pH meter (18) is interlocked with the second neutralization regulating valve (15), the emergency neutralization regulating valve (16) and the first neutralization regulating valve (13). When the sulfuric acid concentration in acidic wastewater is <5%, the method of using the acidic wastewater dual-material neutralization reaction device includes the following steps: Step 1: Pump the acidic wastewater into the reaction cylinder (1) through the inlet pipe (4), open the inlet regulating valve (11) to control the flow rate of the acidic wastewater entering the reaction cylinder (1); Step 2: Pump the carbide slag slurry into the reaction cylinder (1) through the first neutralization pipe (6), open the first neutralization regulating valve (13) to control the flow rate of the carbide slag slurry entering the reaction cylinder (1); Step 3: Start the agitator (2) to fully mix the acidic wastewater and carbide slag slurry. The mixture forms a vortex through the baffle (3). At the same time, open the degassing pipe (9) to remove the hot steam generated during the neutralization reaction. Step 4: After the pH value of the reaction mixture is qualified by pH meter (18), open the outlet pipe (5) and discharge the reaction mixture into the reaction liquid storage device; When the sulfuric acid concentration in the acidic wastewater is 5%-15%, the method of using the acidic wastewater dual-material neutralization reaction device includes the following steps: Step 1: Pump the acidic wastewater into the reaction cylinder (1) through the inlet pipe (4), open the inlet regulating valve (11) to control the flow rate of the acidic wastewater entering the reaction cylinder (1); Step 2: Pump the carbide slag slurry into the reaction cylinder (1) through the first neutralization pipe (6), open the first neutralization regulating valve (13) to control the flow rate of the carbide slag slurry entering the reaction cylinder (1); Step 3: Pump the lime slurry into the reaction cylinder (1) through the second neutralization pipe (7), open the second neutralization regulating valve (15), and control the flow rate of lime slurry entering the reaction cylinder (1); Step 4: Start the agitator (2) to fully mix the acidic wastewater, carbide slag slurry and lime milk. The mixture forms a vortex through the baffle (3). At the same time, open the degassing pipe (9) to remove the hot steam generated during the neutralization reaction. Step 5: After the pH value of the reaction mixture is qualified by pH meter (18), open the outlet pipe (5) and discharge the reaction mixture into the reaction liquid storage device; When the sulfuric acid concentration in the acidic wastewater is <5% and the first neutralization pipe (6) malfunctions, the method of using the acidic wastewater dual-material neutralization reaction device includes the following steps: Step 1: The first neutralization regulating valve (13) feeds back the fault signal of the first neutralization pipe (6) to the emergency neutralization regulating valve (16). The emergency neutralization regulating valve (16) opens the emergency neutralization pipe (8) and pumps the carbide slag slurry into the interior of the reaction cylinder (1) through the emergency neutralization pipe (8). The flow rate of the carbide slag slurry entering the reaction cylinder (1) is controlled by the emergency neutralization regulating valve (16). Step 2: Under the stirring action of the stirring paddle (2), the mixture of acidic wastewater and carbide slag slurry is thoroughly stirred and evenly mixed. The mixture forms a vortex through the baffle (3), and at the same time, the degassing pipe (9) removes the hot steam generated during the neutralization reaction. Step 3: After the pH value of the reaction mixture is qualified by pH meter (18), open the outlet pipe (5) and discharge the reaction mixture into the reaction liquid storage device; When the sulfuric acid concentration in the acidic wastewater is 5%-15% and the first neutralization pipe (6) or the second neutralization pipe (7) malfunctions, the method of using the acidic wastewater dual-material neutralization reaction device includes the following steps: Step 1: The first neutralization regulating valve (13) or the second neutralization regulating valve (15) feeds back the fault signal of the first neutralization pipe (6) or the second neutralization pipe (7) to the emergency neutralization regulating valve (16). The emergency neutralization regulating valve (16) opens the emergency neutralization pipe (8) and pumps the carbide slag slurry or lime milk into the interior of the reaction cylinder (1) through the emergency neutralization pipe (8). The flow rate of the carbide slag slurry or lime milk entering the reaction cylinder (1) is controlled by the emergency neutralization regulating valve (16). Step 2: Under the stirring action of the stirring paddle (2), the mixture of acidic wastewater, carbide slag slurry and lime milk is thoroughly stirred and evenly mixed. The mixture forms a vortex through the baffle (3), and at the same time, the degassing pipe (9) removes the hot steam generated during the neutralization reaction. Step 3: After the pH value of the reaction mixture is qualified by pH meter (18), open the outlet pipe (5) and discharge the reaction mixture into the reaction liquid storage device.

2. The method of using the acidic wastewater dual-material neutralization reaction device according to claim 1, characterized in that: The inlet (20) is also connected to a drain pipe (10), and a drain valve (17) is provided on the drain pipe (10).

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