Unpowered deslagging device for hydrofluoric acid production

Abstract

According to the unpowered deslagging device for hydrofluoric acid production, the outer pipe is arranged to receive and contain tailings and auxiliary slag, the inner spiral structure is arranged in the outer pipe, one end of the inner spiral structure is fixedly connected with the slag cooling furnace, and the barrel body of the slag cooling furnace rotates to drive the inner spiral structure to rotate in the outer pipe, so that the tailings and the auxiliary slag are discharged out of the outer pipe. Compared with the prior art, the discharging device does not need to be driven by power to rotate, the internal spiral structure is driven to rotate by means of rotation in the operation process of the slag cooling furnace, the discharging device is stable, it is guaranteed that the production process is stably carried out, an extra driving motor independently arranged for the discharging device is omitted, and the discharging device is simple in structure and convenient to operate. And the production power consumption is reduced. And on the other hand, the mass difference between the slag cooling furnace and the device is large, the pipe diameter of the outer pipe and the outer diameter of the inner spiral structure can be properly increased, the overall conveying amount is increased, and the problem of material blockage cannot be caused.

Description

Technical Field

[0001] The utility model relates to the field of production devices, in particular to a non-powered slag discharging device for hydrofluoric acid production. Background Art

[0002] In the production of hydrofluoric acid, the materials (fluorite CAF2 and sulfuric acid H2SO4) are heated in a reactor. The hydrofluoric acid gas produced after the reaction enters the production system for absorption and purification, and the powdery tailings (calcium sulfate) produced by the reaction need to enter the discharge conveying equipment at the tail of the reactor.

[0003] In order to reduce the tailings temperature and dust pollution, the discharge conveying equipment usually adopts the upper and lower discharge screw technology, such as Figure 1 As shown, the material enters the upper slag screw conveyor from the reactor, and then enters the lower slag screw conveyor (with a motor). At the same time, in order to ensure that the tailings are neutral (the pH value of the tailings is usually 5-6) and reduce equipment corrosion, carburized slag (calcium hydroxide) is added to the inner auger of the lower slag screw conveyor through the carburized slag screw conveyor. The material is transported into the cold slag furnace through the inner auger of the lower slag screw conveyor (with a motor) for cooling, and finally transported to the slag hopper for storage.

[0004] Because it has to take on the tailings from the upper slag discharge screw and the carbonized slag used for neutralization, when the amount of the two types of slag (tailings and carbonized slag) is large, the load on the lower slag discharge screw will increase, the motor current will be high, and abnormalities may occur, causing equipment shutdown and causing local pollution, seriously affecting the normal operation of production. Utility Model Content

[0005] To this end, it is necessary to provide a non-powered slag discharge device for hydrofluoric acid production to solve the problem that when the amount of the two types of slag (tailings and carbonized slag) is large, the load on the lower slag discharge screw will increase, the motor current will be high, and an abnormality may occur, causing the equipment to stop operating and causing local pollution, seriously affecting the normal operation of production.

[0006] To achieve the above object, the utility model provides a non-powered slag discharge device for hydrofluoric acid production, the device is used to transport the tailings to be cooled to a cold slag furnace for cooling, and comprises:

[0007] A horizontally arranged outer tube and an inner spiral structure arranged inside the outer tube, wherein the inner spiral structure can rotate relative to the outer tube; one end of the outer tube is closed, and the other end is connected to the cold slag furnace; a first opening for feeding tailings is provided on the outer wall of the outer tube; one end of the inner spiral structure is fixedly connected to the cold slag furnace; the central axis of the outer tube, the rotation axis of the inner spiral structure and the rotation axis of the cold slag furnace are all collinear.

[0008] Furthermore, it also includes a plurality of connecting rods, and the inner spiral structure is fixedly connected to the cold slag furnace through the plurality of connecting rods.

[0009] Furthermore, the connecting rod is a metal rod, which is fixedly connected to multiple points of the inner spiral structure in the direction of the rotation axis of the inner spiral structure, and one end of the metal rod is fixedly connected to the cold slag furnace.

[0010] Furthermore, a fixing ring is included, which is fixedly arranged on the inner wall of a side cover of the cold slag furnace, and the fixing ring is fixedly connected to the inner spiral structure through a plurality of connecting rods.

[0011] Furthermore, the inner spiral structure is a hollow structure.

[0012] Furthermore, it also includes an upper slag discharge screw transport mechanism, which is used to transport the tailings discharged from the reactor to the inside of the outer tube through the first opening.

[0013] Furthermore, a second opening is provided on the outer wall of the outer tube.

[0014] Furthermore, it also includes an auxiliary material slag screw transport mechanism, and the discharge end of the auxiliary material slag screw transport mechanism is connected to the second opening.

[0015] Different from the prior art, the above technical solution is to set an outer tube to receive and accommodate tailings and auxiliary slag, set an inner spiral structure in the outer tube, and fix one end of the inner spiral structure to the cold slag furnace. The inner spiral structure is driven to rotate inside the outer tube by the rotation of the barrel of the cold slag furnace. The rotation of the inner spiral structure pushes the tailings to move in the direction of the cold furnace slag to complete the transportation. Compared with the prior art, this device does not require power to drive the rotation. The rotation of the cold slag furnace during operation drives the inner spiral structure to rotate, which is relatively stable, ensuring the stable progress of the production process, and eliminating the need to configure an additional drive motor for the discharging device, thereby reducing production power consumption. On the other hand, due to the large quality gap between the cold slag furnace and the device, the diameter of the outer tube and the outer diameter of the inner spiral structure can be appropriately increased to increase the overall conveying capacity without causing material blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural diagram of a tailings conveying device of the prior art described in the background technology;

[0017] Figure 2 It is a schematic diagram of the structure of the device described in the specific implementation method;

[0018] Figure 3 It is a structural schematic diagram of a device provided with a connecting rod according to a specific implementation method;

[0019] Figure 4It is a structural schematic diagram of a device according to a specific embodiment provided with a fixing ring;

[0020] Figure 5 This is a structural schematic diagram of a specific implementation method in which the device is provided with an upper slag discharge screw transport mechanism, a second opening and an auxiliary material slag screw transport mechanism.

[0021] Description of reference numerals:

[0022] 1. Upper slag screw transport; 2. Carbonized slag screw transport; 3. Lower slag screw transport; 4. Inner auger; 10. Outer tube; 20. Inner spiral structure; 101. First opening; 102. Second opening; 30. Cold slag furnace; 301. Cylinder body; 302. Front cover; 40. Connecting rod; 50. Fixed ring; 60. Upper slag screw transport mechanism; 61. Auxiliary material slag screw transport mechanism. DETAILED DESCRIPTION

[0023] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0024] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0025] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0026] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in a logical relationship of "or".

[0027] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0028] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0029] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0030] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0031] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0032] See also Figure 1 In the production of hydrofluoric acid, the materials (fluorite CaF2 and sulfuric acid H2SO4) react in the reactor while heating. The hydrofluoric acid gas produced after the reaction enters the production system for absorption and purification, and the powdery tailings (calcium sulfate) produced by the reaction enter the tail discharge conveying equipment of the reactor.

[0033] In order to reduce the tailings temperature and the dust pollution of the tailings, the upper and lower slag screw conveyor technology is usually adopted. The material enters the upper slag screw conveyor 1 from the reactor, and then enters the lower slag screw conveyor 3 (with a motor). At the same time, in order to ensure that the tailings are neutral substances (the pH value of the tailings is usually 5-6) and reduce equipment corrosion, carbide slag (calcium hydroxide) is added to the lower slag through the carbide slag screw conveyor 2. The material is transported by the auger 4 (with a motor) in the lower slag screw conveyor 3 and then to the cold slag furnace 30 for cooling, and finally stored in the slag hopper.

[0034] Because it has to take over the tailings from the upper slag discharge and the carbonized slag used for neutralization, when the amount of the two types of slag (tailings and carbonized slag) is large, the load of the lower slag discharge will increase, the motor current will be high, the equipment will stop, and local pollution will occur, seriously affecting the normal operation of production.

[0035] See also Figures 2 to 5The present embodiment provides a non-powered slag discharge device (hereinafter referred to as the device) for hydrofluoric acid production, the device is used to transport the tailings to be cooled to a cold slag furnace 30 for cooling, and comprises: a horizontally arranged outer tube 10 and an inner spiral structure 20 arranged inside the outer tube 10, the inner spiral structure 20 can rotate relative to the outer tube 10, the inner spiral structure 20 can be a solid structure, and the tailings are restricted by the inner wall of the outer tube 10, and move forward into the cold slag furnace 30 through the rotation of the inner spiral structure 20. Preferably, the inner spiral structure 20 can be a hollow structure, and when it is necessary to add auxiliary slag, such as adding carbide slag (calcium hydroxide) to neutralize the acidity and alkalinity of the tailings, the auxiliary slag and the tailings can be fully mixed in the hollow structure of the inner spiral structure 20 to improve the neutralization efficiency. One end of the outer tube 10 is closed, and the other end is connected to the cold slag furnace 30. It should be noted that the connection method between the outer tube 10 and the cold slag furnace 30 is not to directly connect the outer tube 10 to the cold slag furnace 30. The cold slag furnace 30 itself needs to rotate, while the outer tube 10 does not need to rotate. Therefore, it is only necessary to bring the mouth of the outer tube 10 as close to the cold slag furnace 30 as possible. The outer tube 10 can be fixed by a separate hanger or bracket. A first opening 101 for feeding tailings is provided on the outer wall of the outer tube 10. The tailings enter the interior of the outer tube 10 from the first opening 101, contact the internal thread structure and are transported forward under the drive of the internal thread structure. One end of the internal spiral structure 20 is fixedly connected to the cold slag furnace 30. The cold slag furnace 30 generally includes a cylinder 301 and a front cover 302. During the process of cooling the tailings, the cylinder 301 will rotate and roll with the vertical line of the center of the front cover 302 as the rotation axis under the drive of the driving device. The front cover 302 is fixedly connected to the cylinder 301, so the front cover 302 will also rotate, and one end of the inner spiral structure 20 is fixedly connected to the cold slag furnace 30 (that is, fixedly connected to the front cover 302). At the same time, the central axis of the outer tube 10, the rotation axis of the inner spiral structure 20 and the rotation axis of the cold slag furnace 30 are all colinearly arranged. When the cold slag furnace 30 is working, the rotation of the cylinder 301 drives the front cover 302 to rotate, and the front cover 302 can drive the inner spiral structure 20 to rotate, thereby realizing the transportation of the tailings in the outer tube 10 to the cold slag furnace 30.

[0036] It should be noted that the maximum outer diameter of the inner spiral structure 20 should be smaller than the inner diameter of the outer tube 10, and the two values ​​should be relatively close. Taking the device actually used in production by the applicant as an example, the outer diameter of the outer tube 10 can be set to ￠820mm, and the corresponding outer diameter of the inner spiral structure 20 can be set to ￠760mm.

[0037] The novel device is provided with an outer tube 10 to receive and accommodate tailings and auxiliary slag, an inner spiral structure 20 is provided in the outer tube 10, and one end of the inner spiral structure 20 is fixedly connected to the cold slag furnace 30, and the inner spiral structure 20 is driven to rotate inside the outer tube 10 by the rotation of the cylinder 301 of the cold slag furnace 30, and the rotation of the inner spiral structure 20 pushes the tailings to move in the direction of the cold furnace slag to complete the transportation. Compared with the prior art, the device does not require power to drive the rotation, and the rotation of the cold slag furnace 30 during operation drives the inner spiral structure 20 to rotate. Since the inner spiral structure 20 is relatively light and the weight of the cold slag furnace 30 is 45-50 times the weight of the inner spiral structure 20, the actual operating current of the power system when the cold slag furnace 30 drives the inner spiral structure 20 to rotate does not change significantly, and is basically maintained at about 26 amperes, which is relatively stable, ensuring the stable progress of the production process, and eliminating the need to configure an additional drive motor for the discharging device separately, thereby reducing production power consumption. On the other hand, due to the large difference in quality between the cold slag furnace 30 and the device, the diameter of the outer tube 10 and the outer diameter of the inner spiral structure 20 can be appropriately increased to increase the overall conveying capacity without causing material blockage.

[0038] In some embodiments, the device further includes a plurality of connecting rods 40, and the inner spiral structure 20 is fixedly connected to the cold slag furnace 30 through the plurality of connecting rods 40. Preferably, the connecting rod 40 is a metal rod, which is fixedly connected to multiple points of the inner spiral structure 20 in the direction of the rotation axis of the inner spiral structure 20, and one end of the metal rod is fixedly connected to the cold slag furnace 30. The connection of the connecting rod 40 enables the cold slag furnace 30 to drive the inner spiral structure 20 to rotate more stably.

[0039] In some embodiments, the device further includes a fixing ring 50, which is fixedly disposed on the inner wall of a side cover of the cold slag furnace 30, and the fixing ring 50 is fixedly connected to the inner spiral structure 20 through a plurality of connecting rods 40. Compared with fixing one end of the inner spiral structure 20 to the outer wall surface or opening edge of the front cover 302 of the cold slag furnace 30, the fixing ring 50 can make the inner spiral structure 20 extend into the interior of the cold slag furnace 30, increase the contact connection area, and improve stability.

[0040] In some embodiments, the device also includes an upper slag discharge screw transport mechanism 60, which is used to transport the tailings discharged from the reactor to the inside of the outer tube 10 through the first opening 101. Specifically, the feed end of the upper slag discharge screw transport mechanism 60 can be connected to the tailings discharge port of the reactor, and the discharge end is connected to the first opening 101. The upper slag discharge screw transport mechanism 60 is used to realize automatic transportation of the tailings, thereby eliminating manual feeding and improving production efficiency. Its structural composition can refer to the existing screw transportation technology and will not be repeated here.

[0041] In some embodiments, a second opening 102 is provided on the outer wall of the outer tube 10. Auxiliary slag can be added through the second opening 102, and the pH of the tailings can be adjusted to neutral through the auxiliary slag. Taking hydrofluoric acid production as an example, the pH of the calcium sulfate tailings produced is usually 5-6. By adding carbonized slag (calcium hydroxide) as an auxiliary material, the pH of the tailings can be adjusted to neutral, reducing its corrosion to the device, extending the service life of the device, and reducing production costs. Preferably, an auxiliary slag screw transport mechanism 61 is also included, and the discharge end of the auxiliary slag screw transport mechanism 61 is connected to the second opening 102. By connecting the auxiliary slag screw transport mechanism 61 to a container for storing auxiliary slag, the auxiliary slag can be automatically and quantitatively transported to the outer tube 10 through the second opening 102 by the auxiliary slag screw transport mechanism 61, and mixed with the tailings to adjust the pH.

[0042] It should be noted that although the above embodiments have been described in this article, this does not limit the scope of patent protection of the utility model. Therefore, based on the innovative concept of the utility model, changes and modifications to the embodiments described in this article, or equivalent structural or equivalent process changes made using the contents of the utility model specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the utility model patent.

Claims

1. A non-powered slag discharge device for hydrofluoric acid production, the device is used to transport the tailings to be cooled to a cold slag furnace for cooling, characterized in that: include: A horizontally arranged outer tube and an inner spiral structure arranged inside the outer tube, wherein the inner spiral structure can rotate relative to the outer tube; one end of the outer tube is closed, and the other end is connected to the cold slag furnace; a first opening for feeding tailings is provided on the outer wall of the outer tube; one end of the inner spiral structure is fixedly connected to the cold slag furnace; the central axis of the outer tube, the rotation axis of the inner spiral structure and the rotation axis of the cold slag furnace are all collinear.

2. The unpowered slag discharge device for hydrofluoric acid production according to claim 1, characterized in that: It also includes a plurality of connecting rods, and the inner spiral structure is fixedly connected to the cold slag furnace through the plurality of connecting rods.

3. The unpowered slag discharge device for hydrofluoric acid production according to claim 2, characterized in that: The connecting rod is a metal rod, which is fixedly connected to multiple points of the inner spiral structure in the direction of the rotation axis of the inner spiral structure, and one end of the metal rod is fixedly connected to the cold slag furnace.

4. The unpowered slag discharge device for hydrofluoric acid production according to claim 2, characterized in that: It also includes a fixing ring, which is fixedly arranged on the inner wall of a side cover of the cold slag furnace, and the fixing ring is fixedly connected to the inner spiral structure through a plurality of connecting rods.

5. The unpowered slag discharge device for hydrofluoric acid production according to claim 1, characterized in that: The inner spiral structure is a hollow structure.

6. The unpowered slag discharge device for hydrofluoric acid production according to claim 1, characterized in that: It also includes an upper slag discharge screw transport mechanism, which is used to transport the tailings discharged from the reaction furnace to the inside of the outer tube through the first opening.

7. The unpowered slag discharge device for hydrofluoric acid production according to claim 1, characterized in that: A second opening is provided on the outer wall of the outer tube.

8. The unpowered slag discharge device for hydrofluoric acid production according to claim 7, characterized in that: It also includes an auxiliary material slag screw transport mechanism, and the discharge end of the auxiliary material slag screw transport mechanism is connected to the second opening.

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