Fluorosilicic acid treatment structure for fluorine absorption system

Abstract

The utility model discloses a fluosilicic acid treatment structure for a fluorine absorption system, which is used for reducing silica gel precipitation in a fluorine circulating tank and reducing the condition that a pump inlet and a spray head are blocked. The fluosilicic acid treatment structure provided by the utility model is connected with a fluorine tower in a fluorine absorption system and comprises a circulating tank, a first stirring device and a buffer tank, the circulating tank is provided with a water inlet and a water outlet, the water inlet is connected with the fluorine tower, the water outlet is connected with a circulating pipe, and the circulating pipe is connected with a steam inlet pipe of the fluorine tower; the circulating pipe is provided with a first acid outlet pipe, the first acid outlet pipe is used for being connected with the buffer tank, the buffer tank is used for receiving qualified fluosilicic acid in the circulating tank, and the buffer tank is further provided with a second acid outlet pipe connected with a fluosilicic acid tank; the first stirring device is arranged in the circulating tank and is used for stirring the washing liquid in the circulating tank.

Description

Technical Field

[0001] The present application relates to the technical field of industrial fluorine absorption, and in particular to a fluorosilicic acid treatment structure for a fluorine absorption system. Background Art

[0002] Phosphate fertilizer is a fertilizer with phosphorus as the main nutrient. The size (significance) and speed of the effect of phosphate fertilizer are determined by the content of effective phosphorus pentoxide in the phosphate fertilizer, soil properties, fertilization methods, crop types, etc. Phosphate fertilizer is extracted from phosphate rock. After pulverization, acid treatment, precipitation, concentration and other processes, three main phosphate fertilizer products are finally extracted: monophosphate, compound phosphate fertilizer, and calcium hydroxide phosphate fertilizer.

[0003] Nowadays, with the increase in phosphate fertilizer production, the expansion of phosphate mining, the decrease in ore grade, and the compression of product profit margins, companies' requirements for phosphate mines are constantly falling. The content of impurities such as silicon and fluorine in the phosphate mines purchased by phosphate fertilizer companies is getting higher and higher. The existing technology usually produces phosphate fertilizers by wet phosphoric acid production. Fluorine substances need to be recycled. Usually, fluorine-containing gas is combined with washing liquid to produce fluorosilicic acid, and the fluorine substances are recycled by recovering fluorosilicic acid.

[0004] In the prior art, when fluorine is absorbed, silica gel is precipitated in a fluorine circulation tank, which easily blocks the pump inlet and the nozzle inside the tank, thereby causing production interruption and affecting the normal production of phosphoric acid. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a fluorosilicic acid treatment structure for a fluorine absorption system, which can reduce the silica gel precipitation in a fluorine circulation tank and reduce the clogging of the pump inlet and the nozzle.

[0006] The present application provides a fluorine absorption system, wherein the fluorosilicic acid treatment structure is connected to a fluorine tower in the fluorine absorption system, comprising:

[0007] A circulation tank, a first stirring device and a buffer tank; the circulation tank is provided with a water inlet and a water outlet, the water inlet is connected to the monofluoro tower, the water outlet is connected to a circulation pipe, and the circulation pipe is connected to the steam inlet pipe of the monofluoro tower; the circulation pipe is provided with a first acid outlet pipe, the first acid outlet pipe is used to be connected to the buffer tank, the buffer tank is used to receive qualified fluorosilicic acid in the circulation tank, and the buffer tank is also provided with a second acid outlet pipe connected to the fluorosilicic acid tank; the first stirring device is arranged in the circulation tank, and the first stirring device is used to stir the washing liquid in the circulation tank.

[0008] Optionally, a second stirring device is provided in the buffer tank.

[0009] Optionally, both the first stirring device and the second stirring device are internal circulation stirrers.

[0010] Optionally, the first stirring device includes a motor, a stirring shaft and a stirring head, the motor is located above the circulation tank, the stirring head is located inside the circulation tank, and both ends of the stirring shaft are respectively connected to the motor and the stirring head.

[0011] Optionally, a pneumatic diaphragm valve is provided on the first acid outlet pipe, and the pneumatic diaphragm valve is electrically connected to the DCS control system.

[0012] Optionally, a fluorosilicic acid pump is provided on the second acid outlet pipe.

[0013] Optionally, a liquid level meter is provided in the buffer tank, and the liquid level meter is electrically connected to the fluorosilicic acid pump.

[0014] Optionally, the side wall of the buffer tank is provided with an overflow port.

[0015] Optionally, the overflow port and the liquid level meter are arranged at the same height.

[0016] It can be seen from the above technical solutions that this application has the following effects:

[0017] A buffer tank is added between the monofluorine circulation tank and the fluorosilicic acid tank, the buffer tank is used to collect the fluorosilicic acid that meets the standards in the monofluorine circulation tank, and a first stirring device is arranged in the monofluorine circulation tank. The washing liquid in the monofluorine circulation tank is continuously stirred by the first stirring device to avoid silica gel precipitation due to the stillness of the washing liquid, thereby reducing the blockage of the pump inlet and the nozzle by silica gel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution in the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of a fluorosilicic acid treatment structure for a fluorine absorption system provided in the present application;

[0020] Figure 2 This is a schematic diagram of another embodiment of a fluorine circulation tank in a fluorosilicic acid treatment structure for a fluorine absorption system provided in the present application. DETAILED DESCRIPTION

[0021] In the present utility model, the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside”, “outside”, “middle”, “vertical”, “horizontal”, “lateral” and “longitudinal” are based on the directions or positional relationships shown in the accompanying drawings and are only used to illustrate the relative positional relationships between the components or parts, and do not particularly limit the specific installation directions of the components or parts.

[0022] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0023] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to match the contents disclosed in the specification for the technical personnel in this field to understand and read, and are not used to limit the restrictive conditions under which the present application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present application without affecting the effects and purposes that can be achieved by the present application.

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] The present application provides a fluorosilicic acid treatment structure for a fluorine absorption system, which is used to reduce silica gel precipitation in a fluorine circulation tank and reduce the blockage of a pump inlet and a nozzle. The specific implementation process of the present application is described as follows.

[0027] See also Figure 1 and Figure 2 The present application provides a fluorosilicic acid treatment structure for a fluorine absorption system, which is used to connect with a fluorine tower, comprising:

[0028] A circulation tank 1, a first stirring device 3 and a buffer tank 2; the circulation tank 1 is provided with a water inlet and a water outlet, the water inlet is connected to a fluoro tower, the water outlet is connected to a circulation pipe 7, and the circulation pipe 7 is connected to a steam inlet pipe of the fluoro tower; the circulation pipe 7 is provided with a first acid outlet pipe 8, the first acid outlet pipe 8 is used to be connected to the buffer tank 2, the buffer tank 2 is used to receive qualified fluorosilicic acid in the circulation tank 1, and the buffer tank 2 is also provided with a second acid outlet pipe 61 connected to the fluorosilicic acid tank 4; the first stirring device 3 is arranged in the circulation tank 1, and the first stirring device 3 is used to stir the washing liquid in the circulation tank 1.

[0029] The fluorine tower is used to wash fluorine-containing steam. The fluorine-containing steam is brought into contact with washing water, and the fluorine in the fluorine-containing steam forms fluorosilicic acid and dissolves in the washing liquid. The washing liquid flows to the circulation tank 1, and the washing liquid is repeatedly sprayed into the fluorine tower through the circulation tank 1 for repeated washing to increase the concentration of fluorosilicic acid in the washing liquid. When the fluorosilicic acid concentration reaches the standard, the fluorosilicic acid is transported to the fluorosilicic acid tank 4 for storage.

[0030] In the present application, the first stirring device 3 is located in the circulation tank 1, and there is a connection relationship between the first stirring device 3 and the circulation tank 1. In actual use, the first stirring device 3 continuously stirs the washing liquid in the circulation tank 1, thereby avoiding static sedimentation of the washing liquid in the circulation tank 1.

[0031] One end of the circulation pipe 7 is connected to the circulation tank 1, and the other end is connected to the fluoro tower. The circulation tank 7 is provided with a circulation pump 5, and the washing liquid in the circulation tank 1 is transported back to the fluoro tower through the circulation pump 5; the circulation pipe 7 also extends outwardly to a first acid outlet pipe 8, and the first acid outlet pipe 8 is connected to the circulation pipe 7. When the fluorosilicic acid content in the washing liquid reaches the standard (called fluorosilicic acid), the circulation pump 6 transports the fluorosilicic acid to the first acid outlet pipe 8. The first acid outlet pipe 8 is connected to both the buffer tank 2 and the fluorosilicic acid tank 4. Please continue to refer to Figure 1 A pipe cutting valve 82 is also provided on the pipeline connected to the fluorosilicic acid tank 4 , and the pipe cutting valve 82 is used to switch the direction of the fluorosilicic acid. For example, when the pipe cutting valve 82 is closed, the fluorosilicic acid can only flow into the buffer tank 2 .

[0032] In this embodiment, a buffer tank 2 is added between the circulation tank 1 and the fluorosilicic acid tank 4, and a first stirring device 3 is added in the circulation tank 1. The washing liquid in the circulation tank 1 is continuously stirred by the first stirring device, so that static sedimentation of the washing liquid in the circulation tank 1 can be avoided, thereby reducing the adhesion of silica gel to the pump inlet and nozzle, which not only reduces the blockage, but also avoids the problem of production interruption caused by blockage, thereby improving production efficiency.

[0033] Optionally, a second stirring device 21 is provided in the buffer tank 2, and the second stirring device 21 may be the same as the first stirring device 3 or the same. By providing the second stirring device 21 in the buffer tank 2, the second stirring device 21 continuously stirs the fluorosilicic acid in the buffer tank 2, which can also reduce the problem of precipitation due to stillness.

[0034] Optionally, in an achievable manner, when the first stirring device 3 and the second stirring device 21 are the same, both the first stirring device 3 and the second stirring device 21 are inner circulation stirrers 9. Please continue to refer to Figure 2 The inner circulation agitator 9 sucks the washing liquid from above and sprays it downward and obliquely outward, forming a large circulation in the circulation tank 1 and the buffer tank 2, which can fully stir the liquid so that there is no stirring dead corner.

[0035] Optionally, in another achievable manner, the first stirring device 3 includes a motor 31, a stirring shaft 32 and a stirring head 33, the motor 31 is located above the circulation tank 1, the stirring head 33 is located inside the circulation tank 1, and both ends of the stirring shaft 32 are respectively connected to the motor 31 and the stirring head 33.

[0036] Optionally, a pneumatic diaphragm valve 81 is provided on the first acid outlet pipe 8, and the pneumatic diaphragm valve 81 is electrically connected to the DCS system. The DCS system is used to control the opening and closing of the pneumatic diaphragm valve 81. The DCS system accurately controls the opening degree of the pneumatic diaphragm valve 81, thereby achieving precise control of the flow rate of fluorosilicic acid and ensuring that the acid can be discharged in time after the fluorosilicic acid density is qualified.

[0037] Optionally, a fluorosilicic acid pump 6 is provided on the second acid outlet pipe 61 , and the fluorosilicic acid pump 6 is used to extract fluorosilicic acid in the buffer tank 2 and spray it into the fluorosilicic acid tank 4 .

[0038] Optionally, a liquid level gauge 22 is provided in the buffer tank 2, and the liquid level gauge 22 is electrically connected to the fluorosilicic acid pump 6, and the liquid level gauge 22 and the fluorosilicic acid pump 6 are electrically connected to the DCS system respectively. In actual use, when the liquid level of the fluorosilicic acid in the buffer tank 2 reaches the position of the liquid level gauge 22, the DCS system controls the fluorosilicic acid pump 6 to extract the fluorosilicic acid in the buffer tank 2 into the fluorosilicic acid tank 4. In this embodiment, by providing the buffer tank 2, the second acid outlet pipe 61 and the fluorosilicic acid pump 6, the fluorosilicic acid that meets the standard can be first stored in the buffer tank 2, and after the buffer tank 2 is saturated, the fluorosilicic acid is transported to the fluorosilicic acid tank 4 through the fluorosilicic acid pump 6 and the second acid outlet pipe 61, so that the fluorosilicic acid discharged from the circulation tank 1 will not flow continuously and slowly into the fluorosilicic acid tank 4, thereby reducing the blockage of the first acid outlet pipe 8 into the fluorosilicic acid tank.

[0039] It can be understood that the liquid level meter 22 is detachably connected to the buffer tank 2 and the liquid level meter 22 is movable, that is, its height in the buffer tank 2 can be adjusted.

[0040] Optionally, an overflow hole 23 is provided on the side wall of the buffer tank 2 .

[0041] Optionally, the overflow hole 23 and the liquid level meter 22 are arranged at the same height, that is, on the buffer tank 2, the overflow hole 23 and the liquid level meter 22 are on the same horizontal plane.

[0042] In the present application, a buffer tank 2, a second acid outlet pipe 61 and a fluorosilicic acid pump 6 are added, a second stirring device 21 is installed in the buffer tank 2 to prevent silica gel precipitation from blocking the pump inlet, and a liquid level meter 22 is installed to form a linkage with the fluorosilicic acid pump 6 to realize automatic start and stop of the fluorosilicic acid pump 6 according to the set liquid level. The fluorine absorption system includes a first phase and a second phase, and the fluorosilicic acid produced by each fluorine absorption system is uniformly collected in the tank, and then the fluorosilicic acid is transported to the fluorosilicic acid tank 4 by intermittent acid discharge, thereby increasing the medium flow rate in the front end pipeline of the fluorosilicic acid tank 4 and slowing down the pipeline blockage.

[0043] In the present application, after the fluorosilicic acid meets the standards, it is discharged from the circulation tank 1 and can reach the fluorosilicic acid tank 4 via the following routes: one route is to reach the fluorosilicic acid tank 4 after passing through the buffer tank 2 and the fluorosilicic acid pump 6; another route is to directly reach the fluorosilicic acid tank 4 via the first acid outlet pipe 8 and the pipe cutting valve 81; there are also two routes for transporting fluorosilicic acid at the same time.

[0044] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fluorosilicic acid treatment structure for a fluorine absorption system, characterized in that: The fluorosilicic acid treatment structure is connected to a fluorine tower in the fluorine absorption system, and comprises: Circulation tank, first stirring device and buffer tank; The circulation tank is provided with a water inlet and a water outlet, the water inlet is connected to the monofluorine tower, the water outlet is connected to a circulation pipe, and the circulation pipe is connected to the steam inlet pipe of the monofluorine tower; The circulation pipe is provided with a first acid outlet pipe, the first acid outlet pipe is used to be connected to the buffer tank, the buffer tank is used to receive qualified fluorosilicic acid in the circulation tank, and the buffer tank is also provided with a second acid outlet pipe connected to the fluorosilicic acid tank; The first stirring device is disposed in the circulation tank, and is used to stir the washing liquid in the circulation tank.

2. The fluorosilicic acid treated structure according to claim 1, characterized in that: A second stirring device is arranged in the buffer tank.

3. The fluorosilicic acid treated structure according to claim 2, characterized in that: The first stirring device and the second stirring device are both internal circulation stirrers.

4. The fluorosilicic acid treated structure according to claim 1, characterized in that: The first stirring device includes a motor, a stirring shaft and a stirring head. The motor is located above the circulation tank, the stirring head is located inside the circulation tank, and both ends of the stirring shaft are connected to the motor and the stirring head respectively.

5. The fluorosilicic acid treated structure according to any one of claims 1 to 3, characterized in that: The first acid outlet pipe is provided with a pneumatic diaphragm valve, and the pneumatic diaphragm valve is electrically connected to the DCS control system.

6. The fluorosilicic acid treated structure according to any one of claims 1 to 3, characterized in that: The second acid outlet pipe is provided with a fluorosilicic acid pump.

7. The fluorosilicic acid treated structure according to claim 6, characterized in that: A liquid level meter is arranged in the buffer tank, and the liquid level meter is electrically connected to the fluorosilicic acid pump.

8. The fluorosilicic acid treated structure according to claim 7, characterized in that: The side wall of the buffer tank is provided with an overflow port.

9. The fluorosilicic acid treated structure according to claim 8, characterized in that: The overflow port and the liquid level meter are arranged at the same height.

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