An elastic fiber sealing material for coke oven sealing and its preparation method

Abstract

The present invention relates to the technical field of refractories, and specifically discloses an elastic fiber sealing material for coke oven sealing and a preparation method thereof. By mass component ratio, it includes: shredded fiber cotton 10 - 12%, low-fiber sepiolite fiber 3 - 5%, high-fiber sepiolite fiber 3 - 5%, aluminosilicate refractory powder 28% - 32%, Guangxi white clay 4 - 6%, aluminum sulfate solution with a specific gravity of 1.28 3 - 5%, and water 40 - 48%. In the elastic fiber sealing material for coke oven sealing provided by the present invention, the shredded fiber cotton is shredded from the waste of aluminosilicate fiber blanket by a fiber shredder, and the content of Al2O3 + SiO2 ≥ 80%. The shredded fiber cotton is more likely to be dispersed in the sealing material. During shredding, only the original blanket structure is broken up, and the fibers are well maintained. When added to the sealing material, it can effectively reduce the density of the sealing material and maintain the structural integrity, and is not prone to cracking. Compared with the existing sealing treatment methods, the elastic fiber sealing material is easy to operate during construction and application. It is easy to fill and compact gaps of any size, has good integrity and does not crack, and can be applied by brushing or spraying, facilitating large-area construction.

Description

Technical Field

[0001] The present invention belongs to the technical field of refractory materials, and particularly relates to an elastic fiber sealant for coke oven sealing and a preparation method thereof. Background Art

[0002] After a coke oven is used for a period of time, cracks appear in its internal refractories, and the gas in the furnace will permeate through the gaps through the coke oven shell and be emitted to the outside of the coke oven. The pollution of the coke oven flue gas to the environment is relatively serious, and the treatment work is urgent. The methods for treating coke oven smoke on site are mostly to smear the surface of the gaps with fire clay. Fire clay is mostly powder, which is easy to crack. Coupled with the vibration of the shell, it is easy to peel off. For places with larger gaps, fiber ropes are mostly used, and fire clay stirred with water glass is smeared on the surface and then filled in the gaps. The operation is troublesome and it cannot be filled densely. After a period of use, gas will emerge from here again, and the workload is large. The coke oven door vibrates greatly when it is opened and closed. The filled sealing material needs to have a certain elasticity. Only in this way can it not crack easily during vibration.

[0003] There is an urgent need for an elastic sealant with convenient construction performance, which can be smeared or sprayed, does not crack, has good sealing performance, and is convenient for large-scale construction. Summary of the Invention

[0004] The purpose of the present invention is to provide an elastic fiber sealant for coke oven sealing and a preparation method thereof to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An elastic fiber sealant for coke oven sealing and a preparation method thereof, including by mass composition ratio:

[0007] Disintegrated fiber cotton 10-12%, low-fiber sepiolite fiber 3-5%, high-fiber sepiolite fiber 3-5%, aluminosilicate refractory powder 28%-32%, Guangxi white clay 4-6%, aluminum sulfate solution with a specific gravity of 1.28 3-5%, and water 40-48%.

[0008] Preferably, the disintegrated fiber cotton is fiber cotton obtained by disintegrating a fiber blanket through a disintegrator and extracting through a 30mm mesh hole, and the main content is Al2O3+SiO2≥80%.

[0009] Preferably, the fiber content of the low-fiber sepiolite fiber ≤40%; the fiber content of the high-fiber sepiolite fiber ≥80%.

[0010] Preferably, for the aluminosilicate refractory powder, the component content: Al2O3+SiO2≥85%, and the particle size is 180-320 mesh.

[0011] Preferably, the particle size of the Guangxi white clay is 120 mesh - 200 mesh, and Al2O3 + SiO2 ≥ 80%.

[0012] Preferably, the aluminum sulfate solution with a specific gravity of 1.28 is formed by mixing and dissolving 50% aluminum sulfate particles and 50% water, with a specific gravity of 1.28.

[0013] A preparation method of an elastic fiber sealing material for coke oven sealing, including an elastic fiber sealing material for coke oven sealing as described above, is characterized in that the preparation method includes the following steps:

[0014] S1. Add shredded fiber cotton to a blender, add water and stir until there are no dry fiber clusters, then add high-fiber sepiolite fiber and continue to stir until there are no dry fiber clusters, and then add low-fiber sepiolite fiber and continue to stir until the fibers are completely dispersed. The low-fiber sepiolite fiber contains a certain amount of powder, which will absorb the excess water, and the stirred fibers are in a paste state;

[0015] S2. Add aluminosilicate refractory powder to the blender and stir for 3 - 5 minutes until evenly stirred. The powder fills the fiber gaps, making the coating have a certain sealing effect;

[0016] S3. Add Guangxi white clay to the blender to make the coating have a certain viscosity for easy application and have a certain strength after drying;

[0017] S4. Add the aluminum sulfate solution with a specific gravity of 1.28. A small amount of the aluminum sulfate solution can make the coating have a certain strength after drying, and the relatively low strength also keeps the coating with a certain elasticity.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (1) In the elastic fiber sealing material for coke oven sealing provided by the present invention for slag pots, the shredded fiber cotton is shredded from the waste of aluminosilicate fiber blankets by a fiber shredder, with a content of Al2O3 + SiO2 ≥ 80%. The shredded fiber cotton is more easily dispersed in the sealing material. During shredding, only the original blanket structure is broken up, and the fibers are kept in good condition. When added to the sealing material, it can effectively reduce the density of the sealing material and maintain the structural integrity, and is not prone to cracking.

[0020] (2) In the present invention, the high-fiber sepiolite fiber further increases the content of long fibers in the sealant, which is beneficial to the integrity of the sealant. The fiber content is greater than 80%. For the low-fiber sepiolite fiber, the powder contained therein can effectively lock the moisture in the sealant within the sealant, preventing water bleeding from occurring during the storage of the sealant, and its fiber content is less than 40%. The aluminosilicate refractory powder, with the main content of Al2O3 + SiO2 ≥ 85% and a particle size of 180 - 320 mesh, can fill the gaps between the fibers, improving the sealing performance of the sealant. The addition of Guangxi white clay can endow the sealant with a certain viscosity, better adhesion during application or spraying, and also improve the sealing property of the material to a certain extent. The aluminum sulfate solution with a specific gravity of 1.28 is obtained by dissolving aluminum sulfate particles and water in a ratio of 1:1. Adding a small amount of the aluminum sulfate solution can enable the sealant to have appropriate strength after drying.

[0021] (3) In the present invention, the recycled cost of the shredded fiber cotton is low, the main material resources are abundant, the production process is simple and easy to operate, environmentally friendly and pollution-free. Compared with the existing sealing treatment methods, the elastic fiber sealant is easy to operate during construction and application, easy to fill and compact the gaps of various sizes, has good integrity and does not crack, can be applied and sprayed, facilitating large-area construction, has a long service life, reduces labor intensity, has low production costs for enterprises, and obvious economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a flow chart of the preparation method of an elastic fiber sealant for coke oven sealing according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Example 1:

[0025] Please refer to Figure 1 As shown, an elastic fiber sealant for coke oven sealing, by mass composition ratio, includes: shredded fiber cotton 10 - 12%, low-fiber sepiolite fiber 3 - 5%, high-fiber sepiolite fiber 3 - 5%, aluminosilicate refractory powder 28% - 32%, Guangxi white clay 4 - 6%, aluminum sulfate solution with a specific gravity of 1.28 3 - 5%, and water 40 - 48%.

[0026] A preparation method of an elastic fiber sealant for coke oven sealing includes the following steps:

[0027] Add shredded fiber cotton into a blender, add water and stir until there is no dry fiber mass. Then add high-fiber sepiolite fiber and continue to stir until there is no dry fiber mass. Then add low-fiber sepiolite fiber and continue to stir until the fibers are completely dispersed. The low-fiber sepiolite fiber contains a certain amount of powder, which will absorb the excess water, and the stirred fibers are in a paste state;

[0028] Add tertiary bauxite powder into the blender and stir for 3 - 5 minutes until it is evenly stirred. The powder fills the gaps between the fibers, making the coating have a certain sealing effect;

[0029] Add Guangxi white clay into the blender to make the coating have a certain viscosity for easy application, and it also has a certain strength after drying;

[0030] Finally, add aluminum sulfate solution with a specific gravity of 1.28. A small amount of aluminum sulfate solution can make the coating have a certain strength after drying, and the relatively low strength also makes the coating retain a certain elasticity.

[0031] The elastic fiber sealant for coke oven sealing obtained according to the above preparation method has a compressive strength of the elastic fiber sealant ≤ 0.5 Mpa after drying at 105 °C and ≤ 0.5 Mpa after firing at 500 °C; the linear change rate ≤ 0.5% after firing at 500 °C; the hot compressive rate ≥ 15% at 500 °C; the thermal conductivity ≤ 0.2 W / mK at 500 °C, and the spraying rebound rate ≤ 5%.

[0032] An elastic fiber sealant for coke oven sealing, the weight percentages of the raw materials are shown in Table 1 below:

[0033]

[0034]

[0035] Table 1

[0036] The physical and chemical index detection of the elastic fiber sealant for coke oven sealing obtained in this example is shown in Table 2 below:

[0037]

[0038] Table 2

[0039] As can be seen from the above, the elastic fiber sealant for coke oven sealing obtained in this example meets all performance requirements, with less spraying rebound during construction, good elasticity, small shrinkage, no cracking, good heat preservation effect, convenient construction during use, no cracking, elastic, no flue gas leakage, and meets the requirements.

[0040] Example Two:

[0041] An elastic fiber sealant for coke oven sealing, the weight percentages of the raw materials are shown in Table 3 below:

[0042]

[0043]

[0044] Table 3

[0045] The physical and chemical index detection of the elastic fiber sealing material for coke oven sealing obtained in this embodiment is shown in Table 4

[0046]

[0047] Table 4

[0048] As can be seen from the above, the performance of the elastic fiber sealing material for coke oven sealing obtained in this embodiment meets the requirements. During construction spraying, there is less rebound, good elasticity, small shrinkage, no cracking, good heat preservation effect, convenient construction during use, no cracking, elastic, no smoke leakage, and meets the requirements.

[0049] Example 3

[0050] An elastic fiber sealing material for coke oven sealing, the weight percentages of the raw materials are shown in Table 5 below:

[0051]

[0052] Table 5

[0053] The physical and chemical index detection of the elastic fiber sealing material for coke oven sealing obtained in this embodiment is shown in Table 6

[0054]

[0055] Table 6

[0056] As can be seen from the above, the performance of the elastic fiber sealing material for coke oven sealing obtained in this embodiment meets the requirements. During construction spraying, there is less rebound, good elasticity, small shrinkage, no cracking, good heat preservation effect, convenient construction during use, no cracking, elastic, no smoke leakage, and meets the requirements.

[0057] Example 4

[0058] An elastic fiber sealing material for coke oven sealing, the weight percentages of the raw materials are shown in Table 7 below:

[0059]

[0060] Table 5

[0061] The physical and chemical index detection of the elastic fiber sealing material for coke oven sealing obtained in this embodiment is shown in Table 8

[0062]

[0063] Table 6

[0064] As can be seen from the above, it can be concluded from the above data that the strength obtained in this embodiment is too high, resulting in a low hot compression ratio, small elasticity, and easy cracking. Although other properties can meet the requirements, the elasticity requirement of the sealing material cannot be satisfied;

[0065] In the elastic fiber sealing material for coke oven sealing used for slag pots provided by the present invention, the shredded fiber cotton is shredded from the waste of aluminosilicate fiber blankets by a fiber shredding machine, and the content is Al2O3 + SiO2 ≥ 80%. The shredded fiber cotton is more likely to be dispersed in the sealing material. During shredding, only the original blanket structure is broken up, and the fibers are well maintained. When added to the sealing material, it can effectively reduce the density of the sealing material and maintain the structural integrity, and is not prone to cracking.

[0066] The high-fiber type sepiolite fiber further increases the content of long fibers in the sealing material, which is beneficial to the integrity of the sealing material, and the fiber content is greater than 80%. The low-fiber type sepiolite fiber contains powders inside, which can effectively lock the moisture in the sealing material inside the sealing material to prevent water seepage during the storage of the sealing material, and its fiber content is less than 40%. The aluminosilicate refractory powder, with the main content of Al2O3 + SiO2 ≥ 85% and a particle size of 180 - 320 mesh, can fill the gaps between the fibers and improve the sealing performance of the sealing material. The addition of Guangxi white clay can make the sealing material have a certain viscosity, better adhesion during smearing or spraying, and also improve the sealing performance of the material to a certain extent. The aluminum sulfate solution with a specific gravity of 1.28 is obtained by dissolving aluminum sulfate particles and water in a ratio of 1:1. Adding a small amount of the aluminum sulfate solution can make the sealing material have appropriate strength after drying. Excessive addition will result in too high strength and loss of elasticity, and too little addition will cause the strength of the whole material to be too low and easy to powder;

[0067] In the present invention, the shredded fiber cotton has low recycling cost, rich and easily obtainable main material resources, simple and easy-to-operate production process, and is environmentally friendly and pollution-free.

[0068] Compared with the existing sealing treatment methods, the elastic fiber sealing material is easy to operate during construction and smearing, easy to fill and compact the gaps of various sizes, has good integrity and does not crack, can be smeared and sprayed for large-area construction, has a long service life, reduces labor intensity, has low enterprise production cost, and obvious economic benefits.

[0069] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An elastic fiber sealing material for coke oven sealing, characterized in that, It includes by mass composition ratio: Disintegrated fiber cotton 10 - 12%, low-fiber sepiolite fiber 3 - 5%, high-fiber sepiolite fiber 3 - 5%, aluminosilicate refractory powder 28% - 32%, Guangxi white clay 4 - 6%, aluminum sulfate solution with a specific gravity of 1.28 3 - 5% and water 40 - 48%.

2. The elastic fiber sealing material for coke oven sealing according to claim 1, wherein: The disintegrated fiber cotton is fiber fragments extracted through a 30mm mesh hole after the fiber blanket is disintegrated by a disintegrator, and the main content is Al2O3 + SiO2 ≥ 80%.

3. An elastic fiber sealing material for coke oven sealing according to claim 1, characterized in that: The fiber content of the low-fiber sepiolite fiber ≤ 40%; the fiber content of the high-fiber sepiolite fiber ≥ 80%.

4. An elastic fiber sealing material for coke oven sealing according to claim 1, characterized in that: For the aluminosilicate refractory powder, the component content: Al2O3 + SiO2 ≥ 85%, and the particle size is 180 - 320 mesh.

5. The elastic fiber sealing material for coke oven sealing according to claim 1, characterized in that: The Guangxi white clay has a particle size of 120 - 200 mesh, and Al2O3 + SiO2 ≥ 80%.

6. The elastic fiber sealing material for coke oven sealing according to claim 1, characterized in that: The aluminum sulfate solution with a specific gravity of 1.28 is formed by mixing and dissolving 50% aluminum sulfate particles and 50% water, with a specific gravity of 1.

28.

7. A preparation method of an elastic fiber sealing material for coke oven sealing, including an elastic fiber sealing material for coke oven sealing as described in any one of claims 1-6, characterized in that, The preparation method includes the following steps: S1. Add the disintegrated fiber cotton to a blender, add water and stir until there are no dry fiber clusters, then add the high-fiber sepiolite fiber and continue to stir until there are no dry fiber clusters, then add the low-fiber sepiolite fiber, and continue to stir until the fibers are completely dispersed. The low-fiber sepiolite fiber contains a certain amount of powder, which will absorb the excess water, and the stirred fibers are in a paste state; S2. Add the aluminosilicate refractory powder to the blender and stir for 3 - 5 minutes until evenly stirred. The powder fills the fiber gaps, making the coating have a certain sealing effect; S3. Add the Guangxi white clay to the blender to make the coating have a certain viscosity for easy application and have a certain strength after drying; S4. Add the aluminum sulfate solution with a specific gravity of 1.

28. A small amount of the aluminum sulfate solution can make the coating have a certain strength after drying, and the relatively low strength also makes the coating retain a certain elasticity.

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