A device for removing impurities for producing feed-grade zinc oxide

Abstract

This utility model discloses a purification device for producing feed-grade zinc oxide, including a reaction vessel, which is a double-layered hollow vessel. A mixing device is mounted on the reaction vessel, and a real-time zinc powder dosing control mechanism is also provided on the reaction vessel. The real-time zinc powder dosing control mechanism includes a connection inlet. This utility model relates to the field of zinc oxide production technology. This device achieves precise dosing and real-time monitoring through the real-time zinc powder dosing control mechanism, effectively avoiding overuse. Closed-loop control by a spectral detector and drive controller ensures real-time concentration feedback and adjustment, improving separation efficiency. The mixing device and the distributor work together to optimize reaction conditions, improving reaction rate and uniformity. The modular design facilitates rapid maintenance, reduces downtime, and improves production efficiency and equipment lifespan.

Description

Technical Field

[0001] This utility model relates to the field of zinc oxide production technology, specifically to a purification device for producing feed-grade zinc oxide. Background Technology

[0002] Feed-grade zinc oxide, as a feed additive, is mainly used to supplement the zinc requirements of animals, especially piglets during weaning, where it has anti-diarrheal properties. Currently, feed-grade zinc oxide processing primarily employs a wet process with multiple displacement and reduction steps to ensure that the heavy metal content (lead, arsenic, cadmium) meets the specific requirement of ≤10 ppm.

[0003] Currently, most impurities in zinc oxide powder preparation are generated along with the original ore, and are mostly residual heavy metal ions. The current method for removing these heavy metal components is mostly chemical precipitation, which involves dissolving and neutralizing with chemical reagents, followed by zinc powder replacement to achieve extraction and purification. However, this method requires a purification device that adds zinc powder in a mixed manner to complete the replacement reaction. In conventional operations, the amount of zinc powder needed is mostly determined by manual observation. The conventional method of adding zinc powder is to directly add the reaction reagent from the feed port. Not only is the amount of zinc powder added uncontrollable, but it is also easy to make observation errors and lead to excessive zinc powder addition and waste of raw materials. Furthermore, insufficient contact between zinc powder and liquid is prone to occur during the addition process. In view of the above problems, this case was developed through in-depth research. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a purification device for the production of feed-grade zinc oxide, which solves the existing technical problems.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a purification device for producing feed-grade zinc oxide, comprising a reaction vessel, wherein the reaction vessel is a double-layered hollow vessel, a mixing device is mounted on the reaction vessel, and a real-time control mechanism for zinc powder addition is also provided on the reaction vessel;

[0006] The zinc powder dosing real-time control mechanism includes a connection inlet. The top of the reaction vessel is provided with a connection inlet, which extends into the reaction vessel. A feeder is nested on the connection inlet, and a gear set is provided on the feeder. The gear set is linked with the mixing device.

[0007] The real-time control mechanism for zinc powder dosing also includes a zinc powder storage tank, which is installed on the reaction vessel. A screw conveyor is provided at the bottom of the zinc powder storage tank and connected to the inlet. A drive controller is provided on one side of the screw conveyor.

[0008] A spectral detector is installed on one side of the reaction vessel, and the spectral detector is connected to the drive controller.

[0009] Preferably, the reaction vessel is a cylindrical container with a top cover and a slag discharge port at the bottom. The outer circumference of the reaction vessel is provided with at least three support legs, and a temperature controller is provided between the two annular spaces of the reaction vessel.

[0010] Preferably, the mixing device includes a geared motor, which is mounted on the top cover. The drive end of the geared motor is connected to a mixing shaft, and a mixing paddle is mounted on the mixing shaft and located inside the reaction vessel.

[0011] Preferably, the connecting inlet is provided with a flange for connection to the screw conveyor.

[0012] Preferably, the gear set consists of a driving gear mounted on a mixing shaft, an intermediate gear meshing with the driving gear, and a driven gear mounted on the fabric feeder, wherein the driven gear meshes with the intermediate gear.

[0013] Preferably, the fabric feeder has a disc-shaped structure, and the fabric feeder has a plurality of fabric holes arranged around its surface.

[0014] This invention provides a purification device for the production of feed-grade zinc oxide. It offers the following advantages: The device achieves precise addition and real-time monitoring through a real-time zinc powder dosing control mechanism, effectively preventing overuse; closed-loop control of the spectral detector and drive controller ensures real-time concentration feedback and adjustment, improving separation efficiency; the mixing device and distributor work together to optimize reaction conditions, increasing reaction rate and uniformity; and the modular design facilitates rapid maintenance, reduces downtime, and improves production efficiency and equipment lifespan. Attached Figure Description

[0015] Figure 1 This is a first three-dimensional structural diagram of a purification device for producing feed-grade zinc oxide according to the present invention.

[0016] Figure 2 This is a second three-dimensional structural diagram of the purification device for producing feed-grade zinc oxide according to the present invention.

[0017] Figure 3 This is a third-dimensional structural diagram of the purification device for producing feed-grade zinc oxide according to the present invention.

[0018] In the diagram: 1. Reaction vessel; 2. Mixing device; 3. Real-time control mechanism for zinc powder addition; 11. Top cover; 12. Slag discharge port; 13. Support leg; 14. Temperature controller; 21. Gear motor; 22. Mixing shaft; 23. Mixing paddle; 31. Connection inlet; 32. Distributor; 33. Gear set; 34. Zinc powder storage tank; 35. Screw conveyor; 36. Drive controller; 37. Spectrometer detector; 331. Drive gear; 332. Intermediate gear; 333. Driven gear. Detailed Implementation

[0019] 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.

[0020] Please see Figure 1-3 This utility model provides an implementation scheme: In the processing of feed-grade zinc oxide, in order to effectively separate the heavy metal ions contained therein, zinc powder is usually added after the initial oxidation reaction. The heavy metal ions are replaced by zinc powder. The common method of addition is to add a quantitative amount, but this method is prone to causing excessive use of zinc powder and the reaction rate is relatively low.

[0021] To address the aforementioned issues, this application discloses a purification device for the production of feed-grade zinc oxide. The device includes a 316L stainless steel double-walled hollow reactor vessel 1, with an outer carbon steel powder-coated protective layer and an inner layer that has undergone electrolytic polishing to reduce the risk of heavy metal adsorption. An intelligent temperature controller 14 is installed in the double-walled annular space, employing heat transfer oil for precise temperature control to adapt to the needs of different reaction stages.

[0022] The reaction vessel 1 is equipped with a mixing device 2, which continuously mixes the zinc powder and liquid during the addition of zinc powder.

[0023] The reaction vessel 1 is also equipped with a real-time zinc powder dosing control mechanism 3, which includes a 316L stainless steel connection inlet 31, which is connected by a flange seal and extends into the reactor. The connection inlet 31 is nested with a disc-shaped feeder 32, which is formed by 3D printing and has an anodized surface treatment to enhance wear resistance.

[0024] The feeder 32 has multiple feed holes arranged in a ring. The holes are evenly spaced and the inner walls are polished. The chamfered design of the hole openings prevents clogging and ensures that the zinc powder is evenly dispersed. The feeder 32 is linked to the mixing device 2 through the gear set 33, and the same power source provides power for both operations.

[0025] The real-time control mechanism for zinc powder dosing 3 also includes a stainless steel zinc powder storage tank 34, with a vacuum feeding device at the top and a variable frequency screw conveyor 35 at the bottom. The speed is adjustable from 5 to 50 rpm to adapt to different dosing rate requirements. The screw conveyor 35 is connected to the inlet 31 through a polytetrafluoroethylene-coated corrugated pipe to reduce zinc powder adhesion. A PLC drive controller 36 is installed on one side of the screw conveyor 35, with a built-in weighing sensor to monitor the dosing amount in real time. It is linked with an XRF spectrometer 37 to achieve closed-loop control. The probe of the spectrometer 37 is inserted 200 mm below the liquid surface and feeds back data to the controller within 100 ms via RS485 protocol. When the concentration is lower than the threshold, the conveyor speed is automatically reduced to avoid overuse.

[0026] As a preferred option, the reaction vessel 1 is further designed with a cylindrical structure. The top hydraulic cover 11 has an O-ring embedded in the edge to ensure a tight seal. The bottom conical slag discharge port 12 has an optimized angle and a wear-resistant ceramic lining on the inner wall, ensuring smooth slag discharge without residue. The reaction vessel 1 is surrounded by at least three stainless steel feet 13, arranged in a ring array and equipped with shock-absorbing rubber pads to effectively absorb equipment vibration and ensure stable operation. The double-layer ring space intelligent temperature controller 14 uses a PID algorithm to control the flow of heat transfer oil, with a temperature control accuracy of ±0.5℃, suitable for precision reaction requirements.

[0027] As a preferred embodiment, the mixing device 2 further includes a geared motor 21, which is fixed to the top cover 11 via a flange. The drive end is connected to the mixing shaft 22 via a coupling. The mixing shaft 22 is made of 316L stainless steel with a hardened surface and is equipped with a three-layer spiral mixing blade 23. The blade angle of 30° is optimized to generate axial and radial mixing flow, thereby improving the mixing efficiency.

[0028] As a preferred option, the inlet 31 is further connected to the screw conveyor 35 via a flange, and a graphite spiral wound gasket is used between the flanges to seal against temperatures ranging from -200°C to 650°C, ensuring no risk of leakage.

[0029] As a preferred embodiment, the gear set 33 further comprises a driving gear 331 mounted on the mixing shaft 22, an intermediate gear 332 meshing with the driving gear 331, and a driven gear 333 mounted on the fabric feeder 32. The driven gear 333 then meshes with the intermediate gear 332. The gears are chrome-plated and hardened, and are covered with a sealed shell to ensure stable and noiseless transmission, and excellent wear resistance and transmission stability.

[0030] As a preferred option, the feeder has a 32-disc structure with a diameter of 400mm, densely arranged φ3-5mm cloth holes with uniform hole spacing and polished inner walls, resulting in high uniformity of zinc powder dispersion.

[0031] Workflow: After feed-grade zinc oxide slurry is injected into reaction vessel 1, geared motor 21 drives mixing shaft 22 to rotate. Mixing paddle 23 generates axial and radial mixing flow to ensure uniform mixing. Spectrometer 37 monitors the concentration of heavy metal ions in real time and feeds it back to drive controller 36. The controller adjusts the speed of screw conveyor 35 to control the zinc powder feeding rate. Zinc powder is evenly dispersed into reaction vessel 1 by distributor 32, where it undergoes a uniform and rapid displacement reaction with heavy metal ions to generate precipitate. After the reaction, the slurry and slag are discharged through bottom slag outlet 12 and enter the subsequent filtration process. Temperature controller 14 adjusts the reaction temperature in real time to ensure that the reaction is carried out at a suitable temperature. Once the concentration reaches the target, the system automatically stops feeding to avoid over-feeding.

[0032] This device achieves precise addition and real-time monitoring through the zinc powder addition real-time control mechanism 3, effectively avoiding overuse. The closed-loop control of the spectrometer detector 37 and the drive controller 36 ensures real-time concentration feedback and adjustment, improving separation efficiency. The mixing device 2 and the distributor 32 work together to optimize reaction conditions, improving reaction rate and uniformity. The modular design facilitates rapid maintenance, reduces downtime, and improves production efficiency and equipment lifespan.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A purification device for producing feed-grade zinc oxide, comprising a reaction vessel (1), wherein the reaction vessel (1) is a double-walled hollow vessel, and a mixing device (2) is mounted on the reaction vessel (1), characterized in that, The reaction vessel (1) is also equipped with a real-time zinc powder dosing control mechanism (3); The zinc powder dosing real-time control mechanism (3) includes a connection inlet (31). The top of the reaction vessel (1) is provided with a connection inlet (31). The connection inlet (31) extends into the reaction vessel. A feeder (32) is nested on the connection inlet (31). A gear set (33) is provided on the feeder (32). The gear set (33) is linked with the mixing device (2). The zinc powder dosing real-time control mechanism (3) also includes a zinc powder storage tank (34), which is installed on the reaction vessel (1). A screw conveyor (35) is provided at the bottom of the zinc powder storage tank (34) and connected to the inlet (31). A drive controller (36) is provided on one side of the screw conveyor (35). A spectrometer (37) is provided on one side of the reaction vessel (1), and the spectrometer (37) is connected to the drive controller (36).

2. The purification device for producing feed-grade zinc oxide according to claim 1, characterized in that, The reaction vessel (1) is a cylindrical container with a top cover (11) and a slag discharge port (12) at the bottom. The outer circumference of the reaction vessel (1) is provided with at least 3 support legs (13). A temperature controller (14) is provided between the two annular spaces of the reaction vessel (1).

3. The purification device for producing feed-grade zinc oxide according to claim 2, characterized in that, The mixing device (2) includes a geared motor (21), which is mounted on the top cover (11). The driving end of the geared motor (21) is connected to a mixing shaft (22), and a mixing paddle (23) is mounted on the mixing shaft (22) and located inside the reaction vessel (1).

4. The purification device for producing feed-grade zinc oxide according to claim 3, characterized in that, The connecting inlet (31) is provided with a flange that connects to the screw conveyor (35).

5. The purification device for producing feed-grade zinc oxide according to claim 4, characterized in that, The gear set (33) consists of a drive gear (331) mounted on the mixing shaft (22), an intermediate gear (332) meshing with the drive gear (331), and a driven gear (333) mounted on the fabric feeder (32). The driven gear (333) then meshes with the intermediate gear (332).

6. The purification device for producing feed-grade zinc oxide according to claim 5, characterized in that, The fabric feeder (32) has a disc-shaped structure and a number of fabric holes are arranged around the fabric feeder (32).

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