Heavy anti-corrosion lining of steel raffinate acid tank

Abstract

The utility model relates to the technical field of anti-corrosion materials, in particular to a heavy-duty anti-corrosion lining of a steel raffinate acid tank, which comprises a raffinate acid tank main body, the heavy-duty anti-corrosion lining is arranged in the raffinate acid tank, the raffinate acid tank main body is formed by welding a plurality of carbon steel plates, and an inner wall reinforcing structure is arranged on the inner wall of the raffinate acid tank main body. The heavy anti-corrosion lining covers the inner wall reinforcing structure, a zinc coating is arranged on the outer wall of the raffinate acid tank body, a waterproof film is attached to the outer side of the zinc coating, the inner wall reinforcing structure sequentially comprises a steel mesh layer and a plastic layer from inside to outside, and the heavy anti-corrosion lining is arranged on the outer side of the plastic layer. The heavy anti-corrosion lining sequentially comprises a bottom coating, a surface coating and a sealing coating from inside to outside, an FPR reinforcing layer is arranged on the inner wall of the welding seam where the multiple pieces of carbon steel are welded, and the FPR reinforcing layer is arranged between the bottom coating and the surface coating. The inner wall reinforcing structure and the heavy anti-corrosion lining are arranged on the inner wall of the raffinate acid tank, so that the overall strength and the anti-corrosion effect are improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of anticorrosive materials, and particularly relates to a heavy-duty anticorrosive lining for a steel-made raffinate acid tank. Background Art

[0002] Phosphoric acid is the core of the phosphorus chemical industry and is mainly used in industries such as pharmaceuticals, food, and fertilizers. There are usually two methods for preparing phosphoric acid, namely wet-process phosphoric acid and thermal-process phosphoric acid. Since wet-process phosphoric acid has the advantages of low energy consumption and small pollution compared with thermal-process phosphoric acid, wet-process phosphoric acid is often selected for industrial preparation. The raffinate acid tank is mainly used in the wet-process phosphoric acid production process for the collection, storage, and treatment of residual liquids in the leaching and extraction processes. Existing raffinate acid tanks are in long-term contact with high-concentration phosphoric acid and other chemical substances, and are prone to corrosion, especially at the welds and on the surface in contact with the medium. Corrosion can lead to equipment damage, leakage, and even affect production safety. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the above technical problems and propose a heavy-duty anticorrosive lining for a steel-made raffinate acid tank.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is as follows: A heavy-duty anticorrosive lining for a steel-made raffinate acid tank includes a raffinate acid tank main body. A heavy-duty anticorrosive lining is arranged inside the raffinate acid tank. The raffinate acid tank main body is formed by welding multiple carbon steel plates. An inner wall strengthening structure is arranged on the inner wall of the raffinate acid tank main body. The heavy-duty anticorrosive lining covers the inner wall strengthening structure. A galvanized layer is arranged on the outer wall of the raffinate acid tank main body, and a waterproof film is pasted on the outside of the galvanized layer. The inner wall strengthening structure sequentially includes a steel mesh layer and a plastic layer from the inside to the outside. The heavy-duty anticorrosive lining is arranged on the outside of the plastic layer. The heavy-duty anticorrosive lining sequentially includes a primer coat, a top coat, and a sealing coat from the inside to the outside. An FPR reinforcing layer is arranged on the inner wall at the welds where the multiple carbon steels are welded, and the FPR reinforcing layer is arranged between the primer coat and the top coat.

[0005] Further, the steel mesh layer is a grid-like structure formed by several transverse steel bars and several longitudinal steel bars, and the steel mesh layer is fixedly welded to the inner wall of the carbon steel plate.

[0006] Further, the thickness of the steel mesh layer is 20 - 30 mm.

[0007] Further, the plastic layer penetrates and coats the steel mesh layer, and the side of the plastic layer close to the carbon steel plate is attached to the inner wall of the carbon steel plate.

[0008] Further, the thickness of the plastic layer is 10 - 25 mm larger than the thickness of the steel mesh layer.

[0009] Further, the materials of the bottom coating, the top coating, and the sealing coating are all nano-composite emulsions.

[0010] Further, the thickness of the bottom coating is 45 - 50 um.

[0011] Further, the thickness of the top coating is 0.44 - 0.88 mm.

[0012] Further, the thickness of the sealing coating is 0.16 - 0.22 mm.

[0013] Further, the material of the FPR reinforcement layer is FPR modified resin and fiberglass cloth, and the total reinforcement width of the FPR reinforcement layer is 300 - 400 mm.

[0014] As described above for the present utility model, compared with the prior art, a heavy anti-corrosion lining for a steel raffinate acid tank provided by the present utility model has the following beneficial effects: The outer wall of the raffinate acid tank of the present utility model is provided with a galvanized layer and a waterproof film, making the outer wall of the raffinate acid tank not easily corroded and also playing an anti-corrosion role on the outside of the weld. At the same time, an inner wall strengthening structure is provided inside the raffinate acid tank, including a steel mesh layer and a plastic layer. The steel mesh layer can improve the overall strength and service life of the main body of the raffinate acid tank. The plastic layer penetrates and coats the steel mesh layer, having the advantages of high temperature resistance and acid resistance. A bottom coating, a top coating, and a sealing coating are sequentially provided thereon, effectively ensuring the overall anti-corrosion, anti-seepage, and sealing effects, preventing the main body of the raffinate acid tank from being corroded, and an FPR reinforcement layer is added inside the weld, which can enhance the corrosion resistance of the weld and extend the service life of the main body of the high raffinate acid tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the heavy anti-corrosion lining for a steel raffinate acid tank of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following will clearly and completely describe the technical solutions in the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0017] Such as Figure 1As shown in the figure, a heavy-duty anti-corrosion lining for a steel raffinate acid tank includes a raffinate acid tank body 1. A heavy-duty anti-corrosion lining is provided inside the raffinate acid tank. The raffinate acid tank body 1 is formed by welding multiple carbon steel plates. An inner wall strengthening structure is provided on the inner wall of the raffinate acid tank body 1. The heavy-duty anti-corrosion lining covers the inner wall strengthening structure. A galvanized layer 2 is provided on the outer wall of the raffinate acid tank body 1, and a waterproof film 3 is pasted on the outside of the galvanized layer 2. The inner wall strengthening structure sequentially includes a steel mesh layer 4 and a plastic layer 5 from the inside out. The heavy-duty anti-corrosion lining is provided on the outside of the plastic layer 5. The heavy-duty anti-corrosion lining sequentially includes a bottom coating 6, a surface coating 7, and a sealing coating 8 from the inside out. An FPR strengthening layer 9 is provided on the inner wall at the welds where the multiple carbon steels are welded. The FPR strengthening layer 9 is provided between the bottom coating 6 and the surface coating 7. In the utility model, a steel mesh layer 4 and a plastic layer 5 are provided on the inner wall of the raffinate acid tank, which increases the overall strength of the raffinate acid tank. The heavy-duty anti-corrosion lining coated on the outside of the plastic layer 5 effectively ensures the overall anti-corrosion, anti-seepage, and sealing effects, preventing the corrosion of the raffinate acid tank body 1. At the same time, a galvanized layer 2 and a waterproof film 3 are provided on the outer wall of the raffinate acid tank, further enhancing the anti-corrosion effect of the raffinate acid tank body 1. And an FPR strengthening layer 9 is added to the inner wall at the welds where the multiple carbon steel plates are welded on the basis of the heavy-duty anti-corrosion lining, which can effectively prevent the corrosion of the welds and increase the overall service life of the raffinate acid tank body 1.

[0018] The steel mesh layer 4 is a grid-like structure formed by several transverse steel bars and several longitudinal steel bars. The steel mesh layer 4 is fixedly welded on the inner wall of the carbon steel plate. The thickness of the steel mesh layer 4 is 20 - 30 mm. The plastic layer 5 permeates and coats the steel mesh layer 4. The side of the plastic layer 5 close to the carbon steel plate is fitted with the inner wall of the carbon steel plate. The thickness of the plastic layer 5 is 10 - 25 mm larger than the thickness of the steel mesh layer 4. First, the grid-like steel mesh layer 4 is welded on the inner wall of the raffinate acid tank body 1, and then the plastic layer 5 is coated on it, so that one side of the plastic layer 5 is in full contact with the inner wall of the raffinate acid tank, and the other side is flat without the steel mesh layer 4 exposed. It has high temperature resistance, acid resistance, dust erosion resistance, and good thermal conductivity, which can meet the use requirements and improve the service life.

[0019] The materials of the bottom coating 6, the top coating 7, and the sealing coating 8 are all nano-composite emulsions. The thickness of the bottom coating 6 is 45 - 50 μm, the thickness of the top coating 7 is 0.44 - 0.88 mm, and the thickness of the sealing coating 8 is 0.16 - 0.22 mm. During construction and application, first apply a layer of the bottom coating 6 on the carbon steel plate, then apply three layers of the top coating 7 on the bottom coating 6, and finally apply a layer of the sealing coating 8 on the top coating 7. Among them, the nano-composite emulsion of the bottom coating 6 can be the model 8241A of Shishi Huabao New Materials Engineering Co., Ltd. It is a bottom coating for non-metallic substrates, can form chemical bond linkage with metal substrates, has extremely strong adhesion to metal substrates, and at the same time has high heat resistance and elongation at break. The nano-composite emulsion of the top coating 7 can be the model 8243 of Shishi Huabao New Materials Engineering Co., Ltd. The top coating 7 has excellent chemical corrosion resistance and nano-level anti-corrosion medium permeability, and largely solves problems such as lining peeling, falling off, swelling, and cracking caused by rust return. The nano-composite emulsion of the sealing coating 8 can be the model 8244 - 05 of Shishi Huabao New Materials Engineering Co., Ltd. Due to its unique sealing function, it can form a nano-level sealing protection network with extremely high tightness and excellent mechanical properties on the paint film surface, and can isolate the penetration of molecules, ions, and gases in the corrosion medium.

[0020] The material of the FPR reinforcement layer 9 is FPR modified resin and fiberglass cloth. The total reinforcement width of the FPR reinforcement layer 9 is 300 - 400 mm. The model of the FPR modified resin that can be selected is 1240 of Shishi Huabao New Materials Engineering Co., Ltd. Using the hand-laid fiberglass reinforced plastic construction method of FRP modified resin and fiberglass cloth, i.e., applying glue - pasting fiberglass cloth - applying glue, local reinforcement can be carried out on the weld surface of the raffinate acid tank body 1.

[0021] The above are only several specific implementation manners of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification made to the present invention using this concept shall fall within the scope of infringement of the protection scope of the present invention.

Claims

1. Heavy anti-corrosion lining for steel raffinate acid tank, including the main body of the raffinate acid tank. There is a heavy anti-corrosion lining inside the raffinate acid tank. The main body of the raffinate acid tank is composed of multiple carbon steel plates welded together, and its characteristics are as follows: The inner wall of the raffinate acid tank body is provided with an inner wall strengthening structure, and the heavy anti-corrosion lining covers the inner wall strengthening structure. The outer wall of the raffinate acid tank body is provided with a galvanized layer, and a waterproof film is pasted on the outside of the galvanized layer. The inner wall strengthening structure sequentially includes a steel mesh layer and a plastic layer from inside to outside. The heavy anti-corrosion lining is arranged on the outside of the plastic layer. The heavy anti-corrosion lining sequentially includes a bottom coating, a surface coating and a sealing coating from inside to outside. The inner wall at the weld of the multiple carbon steels welded is provided with an FPR reinforcing layer, and the FPR reinforcing layer is arranged between the bottom coating and the surface coating.

2. The heavy anti-corrosion lining of the steel raffinate acid tank according to claim 1, wherein: The steel mesh layer is a grid-like structure formed by a plurality of transverse steel bars and a plurality of longitudinal steel bars, and the steel mesh layer is fixedly welded on the inner wall of the carbon steel plate.

3. The heavy anti-corrosion lining of the steel raffinate acid tank according to claim 1, characterized in that: The thickness of the steel mesh layer is 20 - 30 mm.

4. The heavy-duty corrosion-resistant lining for the steel raffinate acid tank according to claim 1, characterized in that: The plastic layer penetrates and coats the steel mesh layer, and the side of the plastic layer close to the carbon steel plate fits with the inner wall of the carbon steel plate.

5. The heavy anti-corrosion lining of the steel raffinate acid tank according to claim 1, characterized in that: The thickness of the plastic layer is 10 - 25 mm larger than the thickness of the steel mesh layer.

6. The heavy anti-corrosion lining of the steel-made raffinate acid tank according to claim 1, characterized in that: The materials of the bottom coating, the surface coating and the sealing coating are all nano composite emulsions.

7. The heavy-duty anti-corrosion lining for the steel raffinate acid tank according to claim 1, wherein: The thickness of the bottom coating is 45 - 50 um.

8. The heavy anti-corrosion lining of the steel raffinate acid tank according to claim 1, characterized in that: The thickness of the surface coating is 0.44 - 0.88 mm.

9. The heavy anti-corrosion lining of the steel raffinate acid tank according to claim 1, characterized in that: The thickness of the sealing coating is 0.16 - 0.22 mm.

10. The heavy anti-corrosion lining of the steel raffinate acid tank according to claim 1, characterized in that: The material of the FPR reinforcing layer is FPR modified resin and fiberglass cloth, and the total reinforcing width of the FPR reinforcing layer is 300 - 400 mm.

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