Polymeric ferric sulfate aluminum oxidation system

Abstract

The utility model discloses a polymeric ferric sulfate aluminum oxidation system, which comprises a reaction tank, an oxygen tank, a stock solution pulp pool and a qualified pulp pool, the oxygen tank is connected with the reaction tank through an oxygen adding pipe, and the oxygen adding pipe is also provided with an oxygen inlet valve; the device further comprises a buffer metering tank, the buffer metering tank is provided with a second pipeline, a feeding pipe and a charging pipe, and the two ends of the second pipeline are connected with the upper portion of the reaction tank and the upper portion of the buffer metering tank respectively. The two ends of the feeding pipe are respectively connected with the buffer metering tank and the stock solution pulp pool, and a feeding pump and a feeding valve are further arranged on a pipe body of the feeding pipe; two ends of the feeding pipe are respectively connected with the bottom of the buffer metering tank and the upper part of the reaction tank; a circulating centrifugal pump and a feeding valve are arranged on the feeding pipe; a discharge pipe is arranged at the bottom of the reaction tank, two ends of the discharge pipe are respectively connected with the bottom of the reaction tank and a qualified slurry pool, and a slurry discharge valve is further arranged on the discharge pipe. The device has the advantages of novel structure, high oxidation efficiency and the like.

Description

Technical Field

[0001] This utility model relates to the technical field of equipment for preparing polyferric aluminum sulfate, and in particular to a gas-liquid switching position buffer device for a polyferric aluminum sulfate oxidation system. Background Technology

[0002] Polyferric aluminum sulfate (PFAS) is a new type of high-efficiency water treatment agent developed based on polyferric sulfate (PFS) and incorporating the advantages of PFS. It can be widely used for coagulation and sedimentation treatment of various wastewaters, industrial water, and drinking water. As a new type of water treatment agent, polyferric aluminum sulfate must have good flocculation effect to have a promising future. Through a series of coagulation experiments, comparing PFS and PFAS with the same molar concentration, the flocculation effect of PFAS was observed, and the turbidity change was visually observed. It was found that the sample with added PFAS produced larger precipitate flocs, settled faster, and had lower turbidity than the sample with added PFS of the same molar concentration, showing a significantly better effect.

[0003] Existing patent document CN103991912B discloses a synthesis process for polyferric aluminum sulfate, which uses ferrous sulfate heptahydrate, a byproduct of titanium dioxide production via the sulfuric acid process, and titanium dioxide waste acid as raw materials, and liquid oxygen as an oxidant, to synthesize polyferric aluminum sulfate by changing the reaction temperature and reaction time. It employs a traditional oxidation system.

[0004] The above background information is provided only to aid in understanding the concept and technical solution of this utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0005] The main purpose of this invention is to propose a polyferric aluminum sulfate oxidation system with good oxidation continuity and high efficiency.

[0006] Therefore, this utility model proposes a polyferric aluminum sulfate oxidation system.

[0007] Preferably, the present invention may also have the following technical features:

[0008] A polyferric aluminum sulfate oxidation system includes a reaction tank, an oxygen tank, a raw slurry tank, and a qualified slurry tank. The oxygen tank is connected to the reaction tank via an oxygen supply pipe, and the oxygen supply pipe is also equipped with an oxygen inlet valve. It also includes a buffer metering tank, which is equipped with a second pipeline, a feed pipe, and a feeding pipe.

[0009] The two ends of the second pipeline are respectively connected to the upper part of the reaction vessel and the upper part of the buffer metering vessel;

[0010] The two ends of the feeding pipe are respectively connected to the buffer metering tank and the raw liquid slurry tank, and the pipe body is also equipped with a feed pump and a feeding valve.

[0011] The two ends of the feeding pipe are respectively connected to the bottom of the buffer metering tank and the top of the reaction tank; the feeding pipe is equipped with a circulating centrifugal pump and a feed valve;

[0012] The bottom of the reaction vessel is equipped with a discharge pipe, the two ends of which are connected to the bottom of the reaction vessel and the qualified slurry tank, respectively. The discharge pipe is also equipped with a slurry discharge valve.

[0013] Furthermore, the volume of the buffer metering vessel is smaller than the volume of the reaction vessel.

[0014] Furthermore, it also includes a low-pressure liquid seal connecting pipe, the two ends of which are respectively connected to the top of the reaction tank and the raw liquid slurry pool, and a safety valve is also provided in the middle of the pipe body.

[0015] Furthermore, one end of the low-pressure liquid seal connecting pipe extends below the slurry level in the original slurry tank.

[0016] Furthermore, one end of the oxygen supply tube extends into the middle of the reaction vessel.

[0017] Furthermore, one end of the feeding pipe extends to the middle of the buffer metering tank.

[0018] Furthermore, the feeding pipe has a branch at one end connected to the reaction vessel.

[0019] Furthermore, it also includes a first valve, which is installed on the feed pipe between the feed valve and the circulating centrifugal pump.

[0020] Furthermore, it also includes a connecting pipe, one end of which is connected to the discharge pipe between the discharge valve and the reaction tank, and the other end is connected to the feed pipe between the feed valve and the first valve.

[0021] The beneficial effects of this invention compared to existing technologies include: In this embodiment, 26 cubic meters of raw liquid slurry undergoes oxidation reaction in each cycle. A buffer metering tank is used to quantitatively measure, transition, and exchange substances. Multiple cycles are performed within the working time, resulting in strong work continuity and high efficiency. During slurry discharge, the feed pump and loading valve are opened to input 26 cubic meters of raw liquid slurry into the buffer metering tank. The 26 cubic meters of oxygen in the buffer metering tank are then pumped back to the reaction tank via a second pipeline, preventing excessive negative pressure in the reaction tank and accelerating slurry discharge. The circulating centrifugal pump not only transports the raw liquid slurry but also circulates the raw liquid slurry in the reaction tank, thereby improving oxidation efficiency. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the structure of this utility model, showing the oxygen and slurry operation during the oxidation reaction.

[0023] Figure 2 It demonstrates the oxygen and slurry operation during slurry discharge.

[0024] Figure 3 The demonstration showed the operation of oxygen and slurry when the buffer metering tank was supplying liquid to the reaction tank. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

[0026] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein the same reference numerals denote the same parts unless otherwise specifically stated.

[0027] like Figures 1-3 The polyferric aluminum sulfate oxidation system shown includes a reaction tank 2, an oxygen tank 1, a buffer metering tank 3, a raw slurry tank 4, and a qualified slurry tank 5. The oxygen tank 1 is connected to the reaction tank 2 via an oxygen supply pipe 12, and an oxygen inlet valve 11 is also installed on the oxygen supply pipe 12. The buffer metering tank 3 is provided with a second pipeline 8, a feed pipe 9, and a feeding pipe 31. The two ends of the second pipeline 8 are respectively connected to the upper part of the reaction tank 2 and the upper part of the buffer metering tank 3, and the second pipeline 8 serves as a channel for oxygen to move between the buffer metering tank 3 and the reaction tank 2. The two ends of the feed pipe 9 are respectively connected to the buffer metering tank 3 and the raw slurry tank 4. Preferably, the feed pipe 9 is also provided with a feed pump 91 and a feed valve 92. The two ends of the feeding pipe 31 are respectively connected to the bottom of the buffer metering tank 3 and the upper part of the reaction tank 2, and are used to transport the slurry from the buffer metering tank 3 to the reaction tank 2. Preferably, the feeding pipe 31 is equipped with a circulating centrifugal pump 32 and a feed valve 34, with the feed valve 34 installed between the circulating centrifugal pump 32 and the buffer metering tank 3. The bottom of the reaction tank 2 is also equipped with a discharge pipe 51, with its two ends connected to the bottom of the reaction tank 2 and the top of the qualified slurry tank 5, respectively. Preferably, the discharge pipe 51 is also equipped with a slurry discharge valve 52. In this embodiment, the buffer metering tank 3 is a 26-cubic-meter tank. Optionally, the buffer metering tank 3 includes a central cylindrical section and upper and lower cones connected to both ends of the cylindrical section. The reaction tank 2 is a 28-cubic-meter tank, which can be either a round or square tank. A pressure gauge is provided to measure the pressure of the reaction tank 2.

[0028] It also includes a low-pressure liquid seal connecting pipe 7, whose two ends are connected to the top of the reaction tank 2 and the raw slurry pool 4, respectively. A safety valve 71 is installed in its middle. When the pressure inside the reaction tank 2 exceeds a preset value, the safety valve 71 opens, venting oxygen from the reaction tank 2 into the raw slurry pool 4, effectively preventing excessive pressure inside the reaction tank 2. Preferably, one end of the low-pressure liquid seal connecting pipe 7 extends into the slurry in the raw slurry pool 4, and this end is kept below the slurry level. In this way, during operation, air can be vented and pressure reduced through the low-pressure liquid seal connecting pipe 7, while preventing air from entering the reaction tank 2 through the low-pressure liquid seal connecting pipe 7.

[0029] Preferably, one end of the oxygenation pipe 12 extends into the interior of the reaction vessel 2, extending from top to bottom to the middle of the reaction vessel 2, which can improve the contact between oxygen and the slurry inside the reaction vessel 2.

[0030] Preferably, one end of the feeding pipe 9 extends to the middle of the buffer metering tank 3.

[0031] More preferably, the end of the feed pipe 31 connected to the reaction tank 2 is provided with a branch, preferably two branches, through which slurry is injected into the reaction tank 2 to increase the contact between the slurry and oxygen.

[0032] It also includes a connecting pipe 35 and a first valve 33. The front end of the connecting pipe 35 is connected to the discharge pipe 51, and the rear end is connected to the feed pipe 31. Specifically, the front end of the connecting pipe 35 is connected to the discharge pipe 51 between the discharge valve 52 and the reaction tank 2. The first valve 33 is installed on the feed pipe 31 between the feed valve 34 and the circulating centrifugal pump 32. The rear end of the connecting pipe 35 is connected to the feed pipe 31 between the feed valve 34 and the first valve 33.

[0033] The usage method of the polyferric aluminum sulfate oxidation system includes:

[0034] In the initial stage, 26 cubic meters of raw liquid slurry and 2 cubic meters of oxygen are introduced into reaction tank 2, and 26 cubic meters of oxygen are introduced into buffer metering tank 3. All pipeline valves are closed, including closing the slurry discharge valve 52, oxygen inlet valve 11, feeding valve 92, first valve 33 and feed valve 34; preferably, the gas pressure in reaction tank 2 reaches 0.02 MPa.

[0035] During the reaction phase, combined Figure 1 , 2Oxygen is continuously supplied to the reaction tank 2 through the oxygen inlet valve 11 for oxidation. After the oxidation reaction is complete, the oxygen inlet valve 11 is closed, and the slurry discharge valve 52 is opened to release 26 cubic meters of qualified slurry into the qualified slurry tank 5 before closing the slurry discharge valve 52. During slurry discharge, the feed pump 91 and the loading valve 92 are opened to supply 26 cubic meters of raw slurry into the buffer metering tank 3. The 26 cubic meters of oxygen in the buffer metering tank 3 are then pumped back to the reaction tank 2 through the second pipeline 8 to prevent the reaction tank 2 from being excessively compressed and to accelerate slurry discharge. The feed pump 91 is stopped and the loading valve 92 is closed until the slurry in the buffer metering tank 3 reaches 26 cubic meters. In other words, at the beginning of the reaction stage, the buffer metering tank 3 contains 26 cubic meters of oxygen, and the reaction tank 2 contains 26 cubic meters of raw slurry and 2 cubic meters of oxygen. When slurry discharge is completed, the buffer metering tank 3 contains 26 cubic meters of raw slurry, and the reaction tank 2 contains 28 cubic meters of oxygen. Preferably, during the oxidation reaction, the circulating centrifugal pump 32 is turned on to circulate the slurry in the reaction tank 2, while the feed valve 34 is in the closed state. After the oxidation reaction is completed, the circulating centrifugal pump 32 is turned off to improve the oxidation efficiency.

[0036] Cyclic phase, combined Figure 2 , 3 The circulating centrifugal pump 32, the first valve 33, and the feed valve 34 are opened to pump the raw liquid slurry from the buffer metering tank 3 into the reaction tank 2. This allows the oxygen in the reaction tank 2 to be exchanged back into the buffer metering tank 3 via the second pipeline 8. After all 26 cubic meters of raw liquid slurry have been input into the reaction tank 2, the circulating centrifugal pump 32, the first valve 33, and the feed valve 34 are closed, and the oxygen inlet valve 11 is opened to continuously input oxygen into the reaction tank 2 for oxidation, thus repeating the above reaction stage. In this embodiment, 26 cubic meters of raw liquid slurry undergoes oxidation reaction in each cycle. By setting up the buffer metering tank 3, it plays a role in quantitative measurement, transition, and material exchange. Multiple cycles are performed within the working time, resulting in strong work continuity and high work efficiency. During the oxidation reaction, the circulating centrifugal pump 32 and the first valve 33 can also be opened, and the feed valve 34 closed, to improve the oxidation efficiency by circulating the raw liquid slurry in the reaction tank 2.

[0037] In the above-mentioned reaction stage or circulation stage, the gas pressure in reaction tank 2 is maintained at 0.01-0.02 MPa. If the gas pressure is lower than 0.01 MPa, the oxygen flow rate is appropriately increased. If the gas pressure is higher than 0.02 MPa, the safety valve 71 is opened, and the oxygen enters the raw liquid slurry pool 4 through the low-pressure liquid seal connecting pipe 7 and is discharged into the environment.

[0038] Those skilled in the art will recognize that numerous variations are possible with respect to the above description, and the embodiments and figures are merely for describing one or more specific implementations.

[0039] Although exemplary embodiments of the present invention have been described and illustrated, those skilled in the art will understand that various changes and substitutions can be made thereto without departing from the spirit of the present invention. Furthermore, many modifications can be made to adapt specific situations to the doctrine of the present invention without departing from the central concept of the present invention described herein. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but may include all embodiments and equivalents that fall within the scope of the present invention.

Claims

1. A polyferric aluminum sulfate oxidation system, comprising a reaction tank, an oxygen tank, a raw slurry tank, and a qualified slurry tank, wherein the oxygen tank is connected to the reaction tank via an oxygen supply pipe, and the oxygen supply pipe is also equipped with an oxygen inlet valve; characterized in that: It also includes a buffer metering tank, which is equipped with a second pipeline, a feeding pipe, and a adding pipe, wherein, The two ends of the second pipeline are respectively connected to the upper part of the reaction vessel and the upper part of the buffer metering vessel; The two ends of the feeding pipe are respectively connected to the buffer metering tank and the raw liquid slurry tank, and the pipe body is also equipped with a feed pump and a feeding valve. The two ends of the feeding pipe are respectively connected to the bottom of the buffer metering tank and the top of the reaction tank; the feeding pipe is equipped with a circulating centrifugal pump and a feed valve; The bottom of the reaction vessel is equipped with a discharge pipe, the two ends of which are connected to the bottom of the reaction vessel and the qualified slurry tank, respectively. The discharge pipe is also equipped with a slurry discharge valve.

2. The polyferric aluminum sulfate oxidation system as described in claim 1, characterized in that: The volume of the buffer metering tank is smaller than that of the reaction tank.

3. The polyferric aluminum sulfate oxidation system as described in claim 1, characterized in that: It also includes a low-pressure liquid seal connecting pipe, the two ends of which are connected to the top of the reaction tank and the raw liquid slurry pool, respectively, and a safety valve is also provided in the middle of the pipe.

4. The polyferric aluminum sulfate oxidation system as described in claim 3, characterized in that: One end of the low-pressure liquid seal connecting pipe extends below the slurry level in the original slurry tank.

5. The polyferric aluminum sulfate oxidation system as described in claim 1, characterized in that: One end of the oxygen supply pipe extends into the middle of the reaction vessel.

6. The polyferric aluminum sulfate oxidation system as described in claim 1, characterized in that: One end of the feeding pipe extends to the middle of the buffer metering tank.

7. The polyferric aluminum sulfate oxidation system as described in claim 1, characterized in that: The feed pipe has a branch at one end connected to the reaction vessel.

8. The polyferric aluminum sulfate oxidation system as described in claim 1, characterized in that: It also includes a first valve, which is installed on the feed pipe between the feed valve and the circulating centrifugal pump.

9. The polyferric aluminum sulfate oxidation system as described in claim 8, characterized in that: It also includes a connecting pipe, one end of which is connected to the discharge pipe between the discharge valve and the reaction tank, and the other end is connected to the feed pipe between the feed valve and the first valve.

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