Sulfuric acid adding device of wet-process phosphoric acid extraction tank

Abstract

The utility model provides a wet-process phosphoric acid extraction tank sulfuric acid adding device which comprises a sulfuric acid main pipeline, a plurality of branch assemblies are arranged on the sulfuric acid main pipeline and used for extending into an extraction tank, and the discharging ends of the branch assemblies are all located below the liquid level in the extraction tank. The branch assembly comprises a branch main pipeline, a first valve, a flow meter and a second valve, and the first valve, the flow meter and the second valve are sequentially installed on the branch main pipeline in series. A plurality of branch pipes are arranged on the side, close to the discharging end, of the branch main pipeline, and each branch pipe is provided with a third valve. According to the utility model, the degree of supersaturation of slurry in the extraction tank can be effectively improved in actual use, and gypsum crystallization is improved; meanwhile, overflow of fluorine can be reduced, and gas-phase fluorine is fixed into a liquid phase to be recycled.

Description

Technical Field

[0001] This utility model relates to the technical field of phosphoric acid production equipment, specifically to a sulfuric acid addition device for a wet phosphoric acid extraction tank. Background Technology

[0002] Phosphoric acid, as an important chemical raw material, plays a pivotal role in my country's chemical industry. Industrial phosphoric acid is typically obtained by extracting phosphate rock with sulfuric acid, producing calcium sulfate (commonly known as phosphogypsum) as a byproduct. Calcium sulfate dihydrate has the advantages of large crystal particles and easy filtration and separation, so phosphoric acid production enterprises generally adopt the wet phosphoric acid extraction process.

[0003] In wet-process phosphoric acid production, sulfuric acid is usually added to the extraction tank at a concentration of 98%. The dilution of concentrated sulfuric acid releases heat, causing local overheating of the slurry. At the same time, during the feeding process, the sulfuric acid is not well dispersed throughout the slurry. Sulfate ions cause local "supersaturation" and spontaneously form crystal nuclei, generating gypsum crystals that are not conducive to filtration.

[0004] Meanwhile, in actual use, after sulfuric acid and back acid (dilute phosphoric acid) are mixed in the mixer and splashed onto the slurry surface, the high temperature causes a large amount of fluorine to overflow, which not only wastes fluorine but also increases the burden on the tail washing system. Utility Model Content

[0005] The purpose of this invention is to provide a sulfuric acid addition device for a wet phosphoric acid extraction tank, which can effectively improve the supersaturation of the slurry in the extraction tank and improve gypsum crystallization in actual use; at the same time, it can also reduce the overflow of fluorine and fix the gaseous fluorine into the liquid phase for recycling.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A sulfuric acid addition device for a wet phosphoric acid extraction tank includes a main sulfuric acid pipeline, wherein a plurality of branching components are provided on the main sulfuric acid pipeline, the plurality of branching components are used to extend into the extraction tank, and the discharge ends of the branching components are all located below the liquid surface in the extraction tank.

[0008] The branching assembly includes a branching main pipe, a first valve, a flow meter, and a second valve. The first valve, the flow meter, and the second valve are installed in series on the branching main pipe. Several branch pipes are installed on the side of the branching main pipe near the discharge end, and a third valve is installed on each branch pipe.

[0009] In some preferred implementations, the first valve is a manual valve.

[0010] Furthermore, both the second and third valves are pneumatic valves.

[0011] In some preferred embodiments, the extraction tank has multiple chambers with their bottoms interconnected, and the branching components are located within the chambers.

[0012] Furthermore, each chamber is equipped with at least one branching component.

[0013] The outlet end of the branch pipe on the side closest to the liquid surface is located 10-15cm below the liquid surface.

[0014] Furthermore, the flow meter and the second valve are connected to a controller.

[0015] In some preferred embodiments, a stirring mechanism is uniformly provided in each chamber of the extraction tank.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In practical use, this invention utilizes a branching assembly to add sulfuric acid to the extraction tank in a single-channel manner. This branching assembly achieves dispersed addition and multi-point acid supply, allowing the sulfuric acid to be distributed over a wider area within the extraction tank and preventing excessive localized accumulation of concentrated sulfuric acid. The outlet ends of the branching assembly are all located below the liquid surface in the extraction tank. This subsurface entry of the branch pipes prevents violent boiling, ensures uniform heat diffusion within the liquid phase, resulting in a more uniform reaction and improved gypsum crystallization conditions. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the usage status of this utility model.

[0021] Figure label:

[0022] 101 Sulfuric acid main pipeline, 102 Branch pipeline assembly, 103 Extraction tank, 104 Main pipeline, 105 First valve, 106 Flow meter, 107 Second valve, 108 Branch pipe, 109 Third valve, 110 Chamber. Detailed Implementation

[0023] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0024] In the description of the embodiments of this utility model, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0027] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0029] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0030] See Figure 1 and Figure 2 This embodiment discloses a sulfuric acid addition device for a wet phosphoric acid extraction tank, including a main sulfuric acid pipeline 101. The main sulfuric acid pipeline 101 is provided with a plurality of branch components 102. The plurality of branch components 102 are used to extend into the extraction tank 103 for multi-point acid addition, and the discharge ends of the branch components 102 are all located below the liquid surface in the extraction tank 103.

[0031] The branching assembly 102 includes a branching main pipe 104, a first valve 105, a flow meter 106, and a second valve 107. The first valve 105, the flow meter 106, and the second valve 107 are installed in series on the branching main pipe 104. Several branch pipes 108 are provided on the side of the branching main pipe 104 near the discharge end, and a third valve 109 is provided on each branch pipe 108.

[0032] In practical use, this invention uses a branching component 102 to add sulfuric acid to the extraction tank 103 in a single-channel manner. The branching component 102 achieves dispersed addition and multi-point acid supply, allowing the sulfuric acid to be distributed over a wider area within the extraction tank 103, thus avoiding excessive local accumulation of concentrated sulfuric acid. The outlet ends of the branching component 102 are all located below the liquid surface in the extraction tank 103. By using a submerged entry method for the branch pipes 108, boiling over is avoided, heat is evenly diffused within the liquid phase, resulting in a more uniform reaction. This improves the supersaturation of the slurry in the extraction tank, improves gypsum crystallization, reduces fluorine overflow, and allows for the recovery and reuse of gaseous fluorine from the liquid phase.

[0033] Furthermore, the first valve 105 is a manual valve, and the on / off control of the entire branch assembly 102 is achieved through the first valve 105.

[0034] Among them, the second valve 107 and the third valve 109 are both pneumatic valves.

[0035] In practical use, the purpose of quantitative acid addition is achieved by controlling the opening degree of the third valve 109.

[0036] In practical use, the extraction tank 103 has multiple chambers 110 inside, and the bottoms of the multiple chambers 110 are interconnected. The branch assembly 102 is located inside the chambers 110. In this application, there are three chambers 110.

[0037] Each chamber 110 is equipped with at least one branch assembly 102, which makes the acid addition more uniform.

[0038] Furthermore, the outlet end of the branch pipe 108, which is closer to the liquid surface, is located 10-15 cm below the liquid surface. In this embodiment, it is located 10 cm below the liquid surface.

[0039] Furthermore, the flow meter 106 and the second valve 107 are connected to a controller. By monitoring the flow rate, the controller enables automatic control of the opening degree of the second valve 107.

[0040] Furthermore, in actual use, each chamber 110 within the extraction tank 103 is uniformly equipped with a stirring mechanism. This stirring mechanism further enhances the mixing effect.

[0041] Furthermore, in some preferred embodiments, the sulfuric acid addition device of the wet phosphoric acid extraction tank 103 further includes a support and a drive mechanism. The drive mechanism is connected to the support and is used to drive the support to move. The main sulfuric acid pipeline 101 is fixedly mounted on the support, and an extension rod is provided on the support. The branch assembly 102 is fixed on the extension rod. This arrangement can fix the main sulfuric acid pipeline 101 and the branch assembly 102. At the same time, under the action of the drive mechanism, the main sulfuric acid pipeline 101 and the branch assembly 102 can be driven, so that the main sulfuric acid pipeline 101 and the branch assembly 102 can move to achieve the purpose of acid supply at multiple positions and depths. At the same time, the main sulfuric acid pipeline 101 and the branch assembly 102 can also achieve the purpose of stirring during the movement, effectively improving the mixing effect.

[0042] The driving mechanism is a telescopic rod, which can be an electric telescopic rod, a hydraulic telescopic rod, or a pneumatic telescopic rod.

[0043] Furthermore, in actual use, the main sulfuric acid pipeline 101 is connected to a telescopic pipe to ensure that the main sulfuric acid pipeline 101 and the branch assembly 102 can move vertically.

[0044] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sulfuric acid addition device for a wet phosphoric acid extraction tank, comprising a main sulfuric acid pipeline, characterized in that: The main sulfuric acid pipeline is provided with several branching components, which are used to extend into the extraction tank, and the discharge ends of the branching components are all located below the liquid surface in the extraction tank. The branching assembly includes a branching main pipe, a first valve, a flow meter, and a second valve. The first valve, the flow meter, and the second valve are installed in series on the branching main pipe. Several branch pipes are installed on the side of the branching main pipe near the discharge end, and a third valve is installed on each branch pipe.

2. The sulfuric acid addition device for a wet phosphoric acid extraction tank according to claim 1, characterized in that: The first valve is a manual valve.

3. The sulfuric acid addition device for a wet phosphoric acid extraction tank according to claim 1, characterized in that: Both the second and third valves are pneumatic valves.

4. The sulfuric acid addition device for a wet phosphoric acid extraction tank according to claim 1, characterized in that: The extraction tank has multiple chambers inside, and the bottoms of the multiple chambers are interconnected. The branching components are located inside the chambers.

5. The sulfuric acid addition device for a wet phosphoric acid extraction tank according to claim 4, characterized in that: Each chamber is equipped with at least one branch circuit assembly.

6. A sulfuric acid addition device for a wet phosphoric acid extraction tank according to any one of claims 1-5, characterized in that: The outlet end of the branch pipe on the side closest to the liquid surface is located 10-15cm below the liquid surface.

7. A sulfuric acid addition device for a wet phosphoric acid extraction tank according to any one of claims 1-5, characterized in that: The flow meter and the second valve are connected to a controller.

8. A sulfuric acid addition device for a wet phosphoric acid extraction tank according to any one of claims 1-5, characterized in that: Each chamber in the extraction tank is uniformly equipped with a stirring mechanism.

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