A device for oxidizing and recovering low valence metal ions in waste liquid

Abstract

This utility model discloses an oxidation and recovery device for low-valence metal ions in waste liquid, including a main tank, a mixing mechanism, and a filter separator. A main inlet pipe is connected to the top outer wall of the main tank. An aeration network is installed inside the main tank to provide oxygen for the reaction. The mixing mechanism is installed in the main tank to agitate the waste liquid. A dosing route is connected to the side of the main tank to provide reaction promoters to the waste liquid. The filter separator is installed on the top of the main tank, and a circulation route is connected between the filter separator and the main tank. This utility model uses a combination of oxygenation and chemical reaction to capture low-valence metal ions in waste liquid, causing them to react and form oxide precipitates. The oxide precipitates are carried out by waste liquid circulation pumping. The oxide precipitates are separated into solid and liquid components in the filter separator. The oxide precipitates form slag and are sent out, while the filtered liquid components are recycled back to the main tank.

Description

Technical Field

[0001] This utility model relates to the field of waste liquid resource recycling and treatment technology, and more specifically, to an oxidation recovery device for low-valence metal ions in waste liquid. Background Technology

[0002] Large amounts of waste liquid are generated in hydrometallurgical, mining, or chemical production processes. These waste liquids often contain a large number of low-valence metal ions (such as ferrous ions, Fe). 2+ Low-valence metal ions are stable and difficult to precipitate or remove naturally, which makes wastewater treatment extremely difficult. However, low-valence metal ions still have economic value for recycling. If they are directly discarded, it will also cause a waste of resources. Therefore, the company researched the use of oxidation reaction technology to recover low-valence metal ions in waste liquid in the early stage. This not only realizes the extraction of resources, but also reduces the difficulty of subsequent wastewater treatment. This case was born out of this. Utility Model Content

[0003] The purpose of this invention is to address the needs of the prior art by providing an oxidation and recovery device for low-valence metal ions in waste liquid. This invention uses a combination of oxygen aeration and chemical reaction to capture low-valence metal ions in waste liquid, causing them to react and form oxide precipitates. The oxide precipitates are then carried out by waste liquid circulation pumping. The oxide precipitates are separated into solid and liquid components in a filter separator. The oxide precipitates form slag which is then sent out, while the filtered liquid components are recycled back to the main tank.

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

[0005] An oxidation and recovery device for low-valence metal ions in waste liquid includes a main tank, a mixing mechanism, and a filter separator. A main inlet pipe is connected to the top outer wall of the main tank. An aeration network is installed inside the main tank to provide oxygen for the reaction. The mixing mechanism is installed in the main tank to agitate the waste liquid. A dosing line is connected to the side of the main tank to provide reaction-promoting agents to the waste liquid. The filter separator is installed on the top of the main tank, and a circulation route connects the filter separator to the main tank.

[0006] Furthermore, the number of aeration pipe networks installed is no less than three, the aeration pipe networks are arranged and installed along the height direction of the main tank, an oxygen supply device is installed on the outside of the main tank, and all the aeration pipe networks are connected to the oxygen supply device.

[0007] Furthermore, the mixing mechanism includes a stirrer, a guide tube, and a baffle plate. The stirrer includes a stirring shaft and a motor. The motor is installed on the top of the main tank. The stirring shaft is connected to the output end of the motor. Several sets of impellers are installed along the length of the stirring shaft. Each guide tube is equipped with an impeller. The baffle plate is fixedly installed on the inner wall of the main tank.

[0008] Furthermore, the dosing route includes a dosing machine and a dosing pump, the dosing machine pipeline is connected to the bottom of the outer wall of the main tank, and the dosing pump is installed on the connecting pipeline between the dosing machine and the main tank.

[0009] Furthermore, the circulation route includes a first circulation port, a second circulation port, and a third circulation port. The first circulation port is connected to the bottom of the outer wall of the main tank body, and the second and third circulation ports are connected to the filter separator. The second and third circulation ports are installed vertically opposite each other. The first and second circulation ports are connected by a pipeline. A circulation pump is installed on the connecting pipeline between the first and second circulation ports. The third circulation port is inserted into and connected to the top of the main tank body.

[0010] Furthermore, the filter separator includes a body and a slag collection seat. A transversely driven belt conveyor is installed inside the body. The belt of the belt conveyor is made of non-woven fabric. The first circulation port is located directly above the starting end of the belt conveyor. The slag collection seat is installed at the end of the belt conveyor. A slag chamber is formed on the right side of the slag collection seat. A slag discharge pipe is connected to the outer wall of the body. The slag discharge pipe communicates with the slag chamber. A liquid collection space is formed below the belt conveyor. The third circulation port is connected to the bottom of the liquid collection space.

[0011] Furthermore, an inclined scraper plate is fixedly installed on the top of the slag collection seat, and the scraper plate is in contact with the belt surface of the belt conveyor.

[0012] Furthermore, the slag collection seat is equipped with a slag discharge pushing element, which is positioned towards the slag discharge pipe. The slag discharge pipe extends towards the ground, and a slag recovery box is installed at the bottom outlet of the slag discharge pipe.

[0013] Furthermore, a variable diameter seat is also fixedly installed inside the device body. The variable diameter seat is installed above the belt conveyor. A slag passage space is formed between the bottom surface of the variable diameter seat and the belt surface of the belt conveyor. The bottom surface of the variable diameter seat is designed as an inclined surface. The slag passage space gradually decreases along the transmission direction of the belt conveyor.

[0014] The beneficial effects of this utility model are:

[0015] 1. This utility model uses a combination of oxygenation and chemical reaction to capture low-valence metal ions in waste liquid, causing them to react and form oxide precipitates. The oxide precipitates are then carried out by waste liquid circulation pumping. The oxide precipitates are separated into solid and liquid components in a filter separator. The oxide precipitates form slag and are sent out, while the filtered liquid components are recycled back to the main tank.

[0016] 2. The present invention has a reasonable layout and design of the aeration structure and mixing mechanism, which has the advantages of high oxygen utilization and good oxidation reaction efficiency. The present invention can efficiently treat waste liquid containing a large number of low-valence metal ions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structural principle of an oxidation and recovery device for low-valence metal ions in waste liquid in this embodiment;

[0018] Figure 2 This is a schematic diagram of the filter separator in this embodiment.

[0019] Reference numerals in the attached diagram: Main tank 1, main inlet pipe 11, aeration network 12, oxygen supply device 13, mixing mechanism 2, stirrer 21, stirring shaft 211, impeller 212, motor 213, guide tube 22, baffle plate 23, dosing route 3, dosing machine 31, dosing pump 32, filter separator 4, vessel body 41, belt conveyor 42, slag collection seat 43, slag scraper 431, slag chamber 44, slag discharge pipe 45, slag recovery box 451, slag discharge pushing element 46, liquid collection space 47, reducing seat 48, inclined surface 481, slag passage space 49, circulation route 5, first circulation port 51, second circulation port 52, circulation pump 53, third circulation port 54. Detailed Implementation

[0020] 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 some embodiments of the present utility model, and not all embodiments. 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.

[0021] like Figure 1 and Figure 2The device shown is an oxidation and recovery device for low-valence metal ions in waste liquid, comprising a main tank 1, a mixing mechanism 2, and a filter separator 4. A main inlet pipe 11 is connected to the top outer wall of the main tank 1, used to inject the waste liquid to be treated into the main tank 1. A main outlet pipe (not shown) is also connected to the bottom of the main tank 1 to discharge the recovered waste liquid. This invention installs an aeration network 12 inside the main tank 1 to provide oxygen for the reaction. Due to the relatively high height of the main tank 1 (increasing the single-processing capacity), to improve oxygen utilization, this invention installs no fewer than three aeration networks 12 inside the main tank 1, with the aeration networks 12 extending along the main tank body. The main tank 1 is arranged vertically, corresponding to the bottom, middle, and high sections. An oxygen supply device 13 is installed on the outside of the main tank 1. All aeration pipes 12 are connected to the oxygen supply device 13, which continuously provides oxygen to all aeration pipes 12. A mixing mechanism 2 is installed on the main tank 1. The mixing mechanism 2 is the main equipment of this invention. It agitates the waste liquid in the main tank 1 to promote waste liquid flow and accelerate the oxidation reaction of low-valence metal ions. The mixing mechanism 2 includes a stirrer 21, a guide tube 22, and a baffle plate 23. The stirrer 21 is a commonly used stirring mechanism in the chemical industry, which includes a stirring shaft 211 and a motor 213. The motor 213 is installed on the main tank 1. At the top of the tank body 1, the stirring shaft 211 is connected to the output end of the motor 213. The stirring shaft 211 extends downwards without interfering with the aeration pipe network 12. Several sets of impellers 212 are installed along the length of the stirring shaft 211, and each set of impellers 212 corresponds to a waste liquid area separated by multiple aeration pipe networks 12. The simultaneous rotation of multiple sets of impellers 212 creates simultaneous agitation of multiple waste liquid areas. The guide tube 22 is installed in conjunction with the impellers 212, and the baffle 23 is fixedly installed on the inner wall of the main tank body 1. The guide tube 22 and the baffle 23 are also common agitation auxiliary components. Their installation method and operating principle will not be described in detail here. The purpose of installing them in this utility model is to make the flow of waste liquid more intense. The intense current forms a rising-falling circulation. To promote the oxidation reaction of low-valence metal ions, a reaction promoter needs to be injected into the main tank 1. A dosing route 3 is connected to the side of the main tank 1, through which the reaction promoter is supplied to the waste liquid. The dosing route 3 includes a dosing machine 31 and a dosing pump 32. The dosing machine 31 is connected to the bottom of the outer wall of the main tank 1, and the dosing pump 32 is installed on the connecting pipe between the dosing machine 31 and the main tank 1. The reagent in the dosing machine 31 is pumped into the main tank 1 in an orderly manner through the dosing pump 32. The injection position is at the bottom of the main tank 1 (experiments show that the concentration of low-valence metal ions is highest at the bottom of the tank, therefore the reagent is added at the bottom). This process is used to recover ferrous ions (Fe). 2+When adding sodium hydroxide solution, the amount of sodium hydroxide solution added is determined based on the measured pH value in the main tank 1. This invention should install pH meters (not shown in the figure) at each waste liquid height level to measure the pH value in real time. Generally, the pH value is highest at the bottom of the tank. Using the bottom as a reference, the higher the pH value, the more chemicals are added. After the oxidation reaction of low-valence metal ions, oxide precipitates will continuously form. These oxide precipitates are mixed in the waste liquid and need to be separated by filtration. Therefore, this invention designs a filter separator 4, which is installed at the top of the main tank 1. The filter separator 4 separates the precipitates... A circulation route 5 is installed between the separator 4 and the main tank 1. The circulation route 5 continuously draws waste liquid from the main tank 1 into the filter separator 4. The filter separator 4 separates and precipitates the oxides in the waste liquid. The filtrate is returned to the main tank 1, and the oxide precipitate forms slag which is discharged separately. The oxide precipitate slag has metal components and has economic value. After being separated and dried, it can be sold to generate economic income. With the continuous treatment of the waste liquid, the content of low-valence metal ions in the waste liquid is reduced to an extremely low level, which greatly reduces the difficulty of subsequent treatment of this waste liquid.

[0022] like Figure 1 As shown, the circulation route 5 includes a first circulation port 51, a second circulation port 52, and a third circulation port 54. The first circulation port 51 is connected to the bottom of the outer wall of the main tank 1. The second circulation port 52 and the third circulation port 54 are connected to the filter separator 4. The second circulation port 52 and the third circulation port 54 are installed vertically. The first circulation port 51 and the second circulation port 52 are connected by a pipeline. A circulation pump 53 is installed on the connecting pipeline of the first circulation port 51 and the second circulation port 52. The third circulation port 54 is inserted and connected to the top of the main tank 1. Under the pumping of the circulation pump 53, the waste liquid at the bottom of the main tank 1 (the oxide sedimentation tank has the most waste liquid at the bottom, so the extraction is set at the bottom of the tank) is continuously pumped to the filter separator 4 through the circulation route 5 for filtration and separation. The separated filtrate is discharged back to the main tank 1 through the third circulation port 54. Therefore, it is called waste liquid circulation.

[0023] like Figure 2As shown, the filter separator 4 includes a body 41 and a slag collection seat 43. A transversely driven belt conveyor 42 is installed inside the body 41. The belt of the belt conveyor 42 is made of non-woven fabric, with multiple layers of non-woven fabric. The non-woven fabric has mesh openings, which can prevent the precipitation of oxides in the waste liquid, but the liquid can fall normally through the mesh openings to achieve the filtration and separation effect. The first circulation port 51 is located directly above the starting end of the belt conveyor 42. The pumped waste liquid falls directly onto the belt surface at the starting end of the belt conveyor 42, and the oxide precipitate is trapped. The filtrate falls normally. The belt conveyor 42 of this invention adopts intermittent operation to form an oxide precipitate on the belt surface. During the stacking process, the oxide precipitate can be automatically drained by gravity. The slag collection seat 43 is installed at the transmission end of the belt conveyor 42. A slag chamber 44 is formed on the right side of the slag collection seat 43. The drained oxide precipitate falls automatically at the transmission end of the belt conveyor 42 and is collected in the slag chamber 44. At this time, the oxide precipitate is in slag form. The outer wall of the container 41 is connected to the slag discharge pipe 45. 5. The slag chamber 44 is connected to the slag material chamber. The oxide precipitated slag material in the slag material chamber 44 is output through the slag discharge pipe 45. This utility model has a slag discharge pushing element 46 installed on the slag receiving seat 43. The slag discharge pushing element 46 is a conventional structure of a pusher cylinder and a pusher plate. The structure will not be described in detail here. The slag discharge pushing element 46 is set towards the slag discharge pipe 45. The extension and retraction of the piston rod of the pusher cylinder drives the pusher plate to move, so that the oxide precipitated slag material in the slag material chamber 44 is pushed into the slag discharge pipe 45 for output. The slag discharge pipe 45 is installed towards the ground. The bottom outlet of the slag discharge pipe 45 is... A slag recovery box 451 is installed at the location, and the final oxide precipitated slag is collected in the slag recovery box 451. In order to prevent the slag discharge pipe 45 from being blocked, a pneumatic blockage breaking device can also be installed at the top of the slag discharge pipe 45. The blockage is broken by adding high-pressure gas to impact downward. In this utility model, a liquid collection space 47 is formed below the belt conveyor 42. The filtrate filtered from the belt surface is collected in the liquid collection space 47. The third circulation pipe 54 is connected to the bottom of the liquid collection space 47. The third circulation pipe 54 collects the filtrate and makes it flow back into the main tank 1.

[0024] To ensure the filtration capacity of the belt surface, such as Figure 2 As shown, an inclined scraper plate 431 is fixedly installed on the top of the slag collection seat 43. The scraper plate 431 is in contact with the belt surface of the belt conveyor 42. The scraper plate 431 can scrape off the residual oxide deposits on the belt surface to prevent them from clogging the mesh surface. The purpose of the inclined installation of the scraper plate 431 is to allow the scraped oxide deposits to fall smoothly into the slag cavity 44. The scraper plate 431 is made of rubber material to minimize the damage to the non-woven fabric belt surface during operation.

[0025] While belt conveyors and gravity can automatically drain oxide deposits, the liquid content of the oxide sludge pile remains relatively high. Therefore, such as Figure 2As shown, this utility model also has a variable diameter seat 48 structure fixedly installed inside the body 41. The variable diameter seat 48 is installed above the belt conveyor 42. A slag passage space 49 is formed between the bottom surface of the variable diameter seat 48 and the belt surface of the belt conveyor 42. The bottom surface of the variable diameter seat 48 is designed as an inclined surface 481. Along the transmission direction of the belt conveyor 42, the slag passage space 49 gradually decreases. As the belt conveyor 42 is driven, the accumulated oxide precipitate slag will contact the inclined surface 481 at the bottom of the variable diameter seat 48. As the slag passage space 49 gradually decreases, a water squeezing effect can be formed on the oxide precipitate slag. This design can significantly reduce the water content of the oxide precipitate slag, so that the output oxide precipitate slag has a smaller water content, reducing the burden of subsequent drying treatment.

[0026] Example:

[0027] The main tank 1 is designed with a diameter of 2 m and a height of 3 m. The aeration pipe network 12 adopts annular microporous aeration pipes with a pore size of 50 μm and an air flow rate of 5 m³ / h. The initial pH value of the waste liquid is 6.5, and the initial Fe content in the waste liquid is [missing information]. 2+ At a concentration of 200 mg / L, after treatment for 0.5 hours, Fe... 2+ It is almost completely oxidized and precipitated as Fe(OH)3 material, and then separated and output by a filter separator.

[0028] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An oxidation recovery device for low-valence metal ions in waste liquid, characterized in that, The system includes a main tank (1), a mixing mechanism (2), and a filter separator (4). The main tank (1) has a main inlet pipe (11) connected to the top outer wall. An aeration network (12) is installed inside the main tank (1) to provide oxygen for the reaction of the waste liquid. The mixing mechanism (2) is installed on the main tank (1) to agitate the waste liquid inside the main tank (1). A dosing route (3) is connected to the side of the main tank (1) to provide reaction promoters to the waste liquid. The filter separator (4) is installed on the top of the main tank (1). A circulation route (5) is connected between the filter separator (4) and the main tank (1).

2. The apparatus for recovering low valence metal ions by oxidation from waste liquid according to claim 1, wherein The number of aeration pipe networks (12) is no less than three. The aeration pipe networks (12) are arranged and installed along the height direction of the main tank (1). An oxygen supply device (13) is installed on the outside of the main tank (1). All the aeration pipe networks (12) are connected to the oxygen supply device (13).

3. The apparatus for recovering low valence metal ions by oxidation from waste liquid according to claim 1, characterized in that, The mixing mechanism (2) includes a stirrer (21), a guide tube (22) and a baffle plate (23). The stirrer (21) includes a stirring shaft (211) and a motor (213). The motor (213) is installed on the top of the main tank (1). The stirring shaft (211) is connected to the output end of the motor (213). Several sets of impellers (212) are installed along the length of the stirring shaft (211). Each guide tube (22) is equipped with an impeller (212). The baffle plate (23) is fixedly installed on the inner wall of the main tank (1).

4. The apparatus for recovering low valence metal ions by oxidation from waste liquid according to claim 1, characterized in that, The dosing route (3) includes a dosing machine (31) and a dosing pump (32). The dosing machine (31) is connected to the bottom of the outer wall of the main tank (1), and the dosing pump (32) is installed on the connecting pipeline between the dosing machine (31) and the main tank (1).

5. The apparatus for recovering low valence metal ions by oxidation from waste liquid according to claim 1, characterized in that, The circulation route (5) includes a first circulation port (51), a second circulation port (52) and a third circulation port (54). The first circulation port (51) is connected to the bottom of the outer wall of the main tank (1). The second circulation port (52) and the third circulation port (54) are connected to the filter separator (4). The second circulation port (52) and the third circulation port (54) are installed vertically. The first circulation port (51) and the second circulation port (52) are connected by a pipeline. A circulation pump (53) is installed on the connecting pipeline of the first circulation port (51) and the second circulation port (52). The third circulation port (54) is inserted into and connected to the top of the main tank (1).

6. The apparatus for recovering low valence metal ions by oxidation from waste liquid according to claim 5, wherein The filter separator (4) includes a body (41) and a slag collection seat (43). A transverse belt conveyor (42) is installed inside the body (41). The belt of the belt conveyor (42) is made of non-woven fabric. The first circulation port (51) is located directly above the starting end of the belt conveyor (42). The slag collection seat (43) is installed at the end of the belt conveyor (42). A slag chamber (44) is formed on the right side of the slag collection seat (43). A slag discharge pipe (45) is connected to the outer wall of the body (41). The slag discharge pipe (45) is connected to the slag chamber (44). A liquid collection space (47) is formed below the belt conveyor (42). The third circulation port (54) is connected to the bottom of the liquid collection space (47).

7. The apparatus for recovering low valence metal ions by oxidation from waste liquid according to claim 6, characterized in that, The top of the slag collection seat (43) is fixedly equipped with an inclined slag scraper (431), which is in contact with the belt surface of the belt conveyor (42).

8. The apparatus for recovering low valence metal ions by oxidation from waste liquid according to claim 6, characterized in that, The slag collection seat (43) is equipped with a slag discharge pushing element (46), which is set towards the slag discharge pipe (45). The slag discharge pipe (45) extends towards the ground, and a slag recovery box (451) is installed at the bottom outlet of the slag discharge pipe (45).

9. The apparatus for recovering low valence metal ions by oxidation from waste liquid according to claim 6, characterized in that, A variable diameter seat (48) is also fixedly installed inside the body (41). The variable diameter seat (48) is installed above the belt conveyor (42). A slag passage space (49) is formed between the bottom surface of the variable diameter seat (48) and the belt surface of the belt conveyor (42). The bottom surface of the variable diameter seat (48) is designed as an inclined surface (481). Along the transmission direction of the belt conveyor (42), the slag passage space (49) gradually becomes smaller.

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