A repair material for the inner lining of a resistant coke oven, and its preparation and application method.

Abstract

This invention belongs to the field of refractory materials for coke ovens in the coking industry, specifically relating to a refractory coke oven lining repair material and its preparation and application method. This application uses high-alumina bauxite, calcium hexaaluminate, calcite, biotite, wollastonite, and pyrophyllite as main materials, BaO as additives, and borosilicate glass powder and calcium phosphate as binders. Because the main materials of this repair material include high-alumina bauxite and calcium hexaaluminate, it has a high degree of compatibility with the original castable refractory, resulting in strong bonding. A single repair can extend the service life by more than one year, and it can be repeatedly repaired, thereby greatly improving the overall service life of the coke oven lining, reducing coke oven costs, and eliminating resource waste. This repair material can directly repair damaged parts of the coke oven without treating the lining, meeting the coke oven's usage conditions and enabling the reuse of the lining. Furthermore, the repair material's preparation method is simple, has a short construction cycle, and is easy to industrialize.

Description

Technical Field

[0001] This invention belongs to the field of refractory materials for coke tanks in the coking industry, specifically relating to a refractory coke tank lining repair material and its preparation and application methods. Background Technology

[0002] Coke cans are used to transport red-hot coke pushed out of the carbonization chamber. A traction and lifting device loads the coke into the dry quenching coke oven. Currently, the linings of coke cans in major steel plants in China are mainly composed of two types: a welded structural frame with alloy lining plates, and a high-strength mullite lightweight castable precast structure. Compared with traditional alloy lining plates, castable lining plates offer better insulation, reducing the can wall temperature from a maximum of 500℃ to around 150℃. However, their service life is shorter, only about six months, while the traditional ZG35Cr24Ni7SiN high-temperature alloy lining plate can last for more than a year. Later, in order to combine the advantages of traditional alloy liners and high-strength mullite lightweight castables, Chinese patent document CN109704792A (201910015905.9) disclosed a novel refractory castable. Using this invention, the coke oven wall temperature stabilized below 100℃, and the service life could reach more than two years. It had both good insulation properties and extended service life, significantly reducing manufacturing costs and meeting the requirements of continuous coke oven production. However, after two years of use, the lining castable of this type of coke oven was not completely damaged; most of the lining was still usable, only some areas were severely damaged. Because existing repair materials could not meet the repair requirements of this type of lining, the entire coke oven lining had to be removed from production and recast, resulting in a significant waste of resources.

[0003] To address existing problems, this invention provides a novel refractory repair material that can be used for online repair of damaged parts of used coke ovens, enabling the reuse of the coke oven lining and further extending its service life. This repair material exhibits high compatibility and bonding strength with the original castable, extending the service life of a single repair by more than one year. Furthermore, it can be repeatedly repaired, significantly improving the overall service life of the coke oven, reducing costs, and eliminating resource waste. Simultaneously, the repair material is designed with thermal insulation in mind, ensuring that the temperature of the repaired coke oven wall remains stable below 100°C. Summary of the Invention

[0004] This invention provides a high-performance coke oven lining repair material. This material boasts advantages such as low cost, high strength, strong bond with the substrate, excellent thermal shock resistance, good insulation, convenient construction, and long service life. A single repair can extend the service life of the coke oven by more than one year, and it can be repeatedly repaired, significantly improving the overall service life of the coke oven, reducing costs, and eliminating resource waste. To solve the above technical problems, the technical solution adopted by this invention is:

[0005] Using high-alumina bauxite, calcium hexaaluminate, calcite, biotite, wollastonite, and pyrophyllite as the main materials, BaO as the additive, and borosilicate glass powder and calcium phosphate as the binders, this material is used to repair damaged parts of the coke oven lining.

[0006] The technical problem to be solved by the present invention is achieved by the following technical solution: a repair material for the lining of a resistant coke oven, wherein the repair material comprises the following raw materials in parts by weight:

[0007] High-alumina bauxite with a particle size of 3mm to 5mm: 15 to 26 parts;

[0008] Calcium hexaaluminate with a particle size of 1 mm to 3 mm: 18 to 25 parts;

[0009] Calcite with a particle size of 1mm to 3mm: 10 to 20 parts;

[0010] Biotite with a particle size ≤3mm: 12-19 parts;

[0011] Wollastonite with a particle size ≤1mm: 9-11 parts;

[0012] Pyrophyllite with a particle size ≤1mm: 4-6 parts;

[0013] BaO with a particle size less than 0.088 mm: 3-5 parts;

[0014] 2-4 parts of borosilicate glass powder with a particle size of 180 mesh;

[0015] Calcium phosphate with a particle size less than 0.088 mm: 2-7 parts;

[0016] Water-reducing agent: 1-2 parts.

[0017] According to a preferred embodiment of the present invention, the water-reducing agent is at least one of sodium tripolyphosphate and sodium hexametaphosphate.

[0018] According to a preferred embodiment of the present invention, the repair material comprises the following raw materials in parts by weight:

[0019] High-alumina bauxite with a particle size of 3mm to 5mm: 17 to 25 parts;

[0020] Calcium hexaaluminate with a particle size of 1 mm to 3 mm: 19 to 24 parts;

[0021] Calcite with a particle size of 1mm to 3mm: 11 to 18 parts;

[0022] Biotite with a particle size ≤3mm: 13-17 parts;

[0023] Wollastonite with a particle size ≤1mm: 9-11 parts;

[0024] Pyrophyllite with a particle size ≤1mm: 4-6 parts;

[0025] BaO with a particle size less than 0.088 mm: 4-5 parts;

[0026] 2-4 parts of borosilicate glass powder with a particle size of 180 mesh;

[0027] Calcium phosphate with a particle size less than 0.088 mm: 3-6 parts;

[0028] Water-reducing agent: 1-2 parts.

[0029] According to a preferred embodiment of the present invention, the repair material comprises the following raw materials in parts by weight:

[0030] High-alumina bauxite with a particle size of 3mm to 5mm: 19 to 22 parts;

[0031] Calcium hexaaluminate with a particle size of 1 mm to 3 mm: 20 to 22 parts;

[0032] Calcite with a particle size of 1mm to 3mm: 14 to 17 parts;

[0033] Biotite with a particle size ≤3mm: 13-16 parts;

[0034] Wollastonite with a particle size ≤1mm: 10-11 parts;

[0035] Pyrophyllite with a particle size ≤1mm: 4-6 parts;

[0036] BaO with a particle size less than 0.088 mm: 4-5 parts;

[0037] 2-4 parts of borosilicate glass powder with a particle size of 180 mesh;

[0038] Calcium phosphate with a particle size less than 0.088 mm: 3-5 parts;

[0039] Water-reducing agent: 1-2 parts.

[0040] According to a preferred embodiment of the present invention, the repair material comprises the following raw materials in parts by weight:

[0041] High-alumina bauxite with a particle size of 3mm to 5mm: 20 to 21 parts;

[0042] Calcium hexaaluminate with a particle size of 1 mm to 3 mm: 21 to 22 parts;

[0043] Calcite with a particle size of 1mm to 3mm: 14 to 15 parts;

[0044] Biotite with a particle size ≤3mm: 15-16 parts;

[0045] Wollastonite with a particle size ≤1mm: 10-11 parts;

[0046] Pyrophyllite with a particle size ≤1mm: 4-5 parts;

[0047] BaO with a particle size less than 0.088 mm: 4-5 parts;

[0048] 2-3 parts of borosilicate glass powder with a particle size of 180 mesh;

[0049] Calcium phosphate with a particle size less than 0.088 mm: 4-5 parts;

[0050] Water-reducing agent: 1-2 parts.

[0051] The present invention also discloses a method for preparing the above-mentioned resistant material coke oven lining repair material. According to their respective proportions, high alumina bauxite, calcium hexaaluminate, calcite, biotite, wollastonite, pyrophyllite, BaO, borosilicate powder, calcium phosphate and water-reducing agent are poured into a mixer and mixed for 5 to 8 minutes to obtain a uniform repair material.

[0052] The present invention also discloses a method for using the above-mentioned resistant material coke liner repair material, wherein 5% to 7% of water by weight of the repair material is added to the repair material, and then stirred for 6 to 9 minutes, and the stirred repair material can be used to repair the damaged parts of the coke liner.

[0053] After repair and curing for 3 days, the product is demolded, dried at 110℃ for 24 hours, and then kept at 300℃ for 24 hours. After natural cooling, it can be put into use.

[0054] According to a preferred embodiment of the present invention, the material of the castable refractory used for the coke oven lining comprises the following raw materials in parts by weight:

[0055] High-alumina bauxite with a particle size of 5mm to 8mm: 10 to 22 parts;

[0056] Calcium hexaaluminate with a particle size of 3mm to 5mm: 20 to 38 parts;

[0057] Calcined quartz with a particle size of 1mm to 3mm: 6 to 10 parts;

[0058] Forsterite with a grain size ≤1mm: 11-21 parts;

[0059] Magnesium aluminum spinel with a particle size of 180 mesh: 9-19 parts;

[0060] Ethyl silicate: 2-7 parts;

[0061] Hydrated alumina with a particle size less than 0.088 mm: 2-10 parts;

[0062] Dextrin: 1-4 parts;

[0063] Water-reducing agent: 1-3 parts. That is, the material of the castable lining used in the coke oven is the refractory castable disclosed in patent CN109704792A (201910015905.9).

[0064] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0065] 1. Damaged parts of the coke oven can be repaired online without removing and recasting the lining, thus enabling the reuse of the coke oven lining.

[0066] 2. The repair material has a high degree of compatibility with the original castable material of the coke oven lining, and the bonding strength is high. The service life of a single repair can be extended by more than 1 year.

[0067] 3. The repair material of this application can be used to repeatedly repair the damaged parts of the coke tank, which greatly improves the overall service life of the coke tank lining.

[0068] 4. It reduced the cost of coke ovens and eliminated resource waste.

[0069] 5. The coke oven lining prepared with this repair material is suitable for the internal working requirements of coke ovens, and its main physical and chemical properties are as follows:

[0070] Detailed Implementation

[0071] The following embodiments are further illustrations of the present invention, but the present invention is not limited thereto.

[0072] Example 1

[0073] Example 1 provides a repair material for the inner lining of a resistant coke oven, the raw material formula of which is shown in Table 1:

[0074] Weigh all materials according to the proportions described in Table 1, pour them into a mixer and mix for 5 to 8 minutes to obtain a uniform repair material.

[0075] Then add water to the prepared repair material, the amount of water being 5% to 7% of the total weight of the repair material, and stir for 6 to 9 minutes. The mixed repair material can then be used to repair the damaged parts of the coke oven lining.

[0076] After repair and curing for 3 days, the product is demolded, dried at 110℃ for 24 hours, then kept at 300℃ for 24 hours, and allowed to cool naturally before use. Its main physicochemical properties are as follows:

[0077]

[0078]

[0079] Example 2

[0080] Example 2 provides a repair material for the inner lining of a resistant coke oven, the raw material formula of which is shown in Table 1:

[0081] The method for repairing the coke oven lining with this repair material is the same as in Example 1, and its main physicochemical properties are as follows:

[0082]

[0083] Example 3

[0084] Example 3 provides a repair material for the inner lining of a resistant coke oven, the raw material formula of which is shown in Table 1:

[0085] The method for repairing the coke oven lining with this repair material is the same as in Example 1, and its main physicochemical properties are as follows:

[0086]

[0087] Example 4

[0088] Example 4 provides a repair material for the inner lining of a resistant coke oven, the raw material formula of which is shown in Table 1:

[0089] The method for repairing the coke oven lining with this repair material is the same as in Example 1, and its main physicochemical properties are as follows:

[0090]

[0091]

[0092] Example 5

[0093] Example 5 provides a repair material for the inner lining of a resistant coke oven, the raw material formula of which is shown in Table 1:

[0094] The method for repairing the coke oven lining with this repair material is the same as in Example 1, and its main physicochemical properties are as follows:

[0095]

[0096] Example 6

[0097] Example 6 provides a repair material for the inner lining of a resistant coke oven, the raw material formula of which is shown in Table 1:

[0098] The method for repairing the coke oven lining with this repair material is the same as in Example 1, and its main physicochemical properties are as follows:

[0099]

[0100] Example 7

[0101] Example 7 provides a repair material for the inner lining of a resistant coke oven, the raw material formula of which is shown in Table 1:

[0102] The method for repairing the coke oven lining with this repair material is the same as in Example 1, and its main physicochemical properties are as follows:

[0103]

[0104]

[0105] Table 1. Raw material formulas for Examples 1-7. Unit: parts by mass.

[0106]

[0107] The resistant coke liner repair materials in Examples 1-7 can be directly used to repair damaged parts of the coke liner, and the repaired parts can obtain good physical and chemical properties or performance, meet the service conditions of the coke, and improve the service life of the coke.

Claims

1. A repair material for the lining of a durable coke oven, characterized in that, The repair material comprises the following raw materials in parts by weight: High-alumina bauxite with a particle size of 3mm to 5mm: 15 to 26 parts; Calcium hexaaluminate with a particle size of 1 mm to 3 mm: 18 to 25 parts; Calcite with a particle size of 1mm to 3mm: 10 to 20 parts; Biotite with a particle size ≤3mm: 12-19 parts; Wollastonite with a particle size ≤1mm: 9-11 parts; Pyrophyllite with a particle size ≤1mm: 4-6 parts; BaO with a particle size less than 0.088 mm: 3-5 parts; 2-4 parts of borosilicate glass powder with a particle size of 180 mesh; Calcium phosphate with a particle size less than 0.088 mm: 2-7 parts; Water-reducing agent: 1-2 parts.

2. The resistant coke oven lining repair material according to claim 1, characterized in that: The water-reducing agent is at least one of sodium tripolyphosphate and sodium hexametaphosphate.

3. The resistant coke oven lining repair material according to claim 1, characterized in that, The repair material comprises the following raw materials in parts by weight: High-alumina bauxite with a particle size of 3mm to 5mm: 17 to 25 parts; Calcium hexaaluminate with a particle size of 1 mm to 3 mm: 19 to 24 parts; Calcite with a particle size of 1mm to 3mm: 11 to 18 parts; Biotite with a particle size ≤3mm: 13-17 parts; Wollastonite with a particle size ≤1mm: 9-11 parts; Pyrophyllite with a particle size ≤1mm: 4-6 parts; BaO with a particle size less than 0.088 mm: 4-5 parts; 2-4 parts of borosilicate glass powder with a particle size of 180 mesh; Calcium phosphate with a particle size less than 0.088 mm: 3-6 parts; Water-reducing agent: 1-2 parts.

4. The resistant coke oven lining repair material according to claim 1, characterized in that, The repair material comprises the following raw materials in parts by weight: High-alumina bauxite with a particle size of 3mm to 5mm: 19 to 22 parts; Calcium hexaaluminate with a particle size of 1 mm to 3 mm: 20 to 22 parts; Calcite with a particle size of 1mm to 3mm: 14 to 17 parts; Biotite with a particle size ≤3mm: 13-16 parts; Wollastonite with a particle size ≤1mm: 10-11 parts; Pyrophyllite with a particle size ≤1mm: 4-6 parts; BaO with a particle size less than 0.088 mm: 4-5 parts; 2-4 parts of borosilicate glass powder with a particle size of 180 mesh; Calcium phosphate with a particle size less than 0.088 mm: 3-5 parts; Water-reducing agent: 1-2 parts.

5. The resistant coke oven lining repair material according to claim 1, characterized in that, The repair material comprises the following raw materials in parts by weight: 20-21 parts of high-alumina bauxite with a particle size of 3mm-5mm; Calcium hexaaluminate with a particle size of 1 mm to 3 mm: 21 to 22 parts; Calcite with a particle size of 1mm to 3mm: 14 to 15 parts; Biotite with a particle size ≤3mm: 15-16 parts; Wollastonite with a particle size ≤1mm: 10-11 parts; Pyrophyllite with a particle size ≤1mm: 4-5 parts; BaO with a particle size less than 0.088 mm: 4-5 parts; 2-3 parts of borosilicate glass powder with a particle size of 180 mesh; Calcium phosphate with a particle size less than 0.088 mm: 4-5 parts; Water-reducing agent: 1-2 parts.

6. A method for preparing a resistant coke oven lining repair material according to any one of claims 1 to 5, characterized in that: According to their respective proportions, high-alumina bauxite, calcium hexaaluminate, calcite, biotite, wollastonite, pyrophyllite, BaO, borosilicate powder, calcium phosphate, and water-reducing agent are poured into a mixer and mixed for 5 to 8 minutes to obtain a uniform repair material.

7. A method of using the resistant coke oven lining repair material according to any one of claims 1 to 5, characterized in that: Add 5% to 7% water by weight of the repair material to the repair material, stir for 6 to 9 minutes, and then use the mixed repair material to pour and repair the damaged parts of the coke tank lining. After repair and curing for 3 days, the product is demolded, dried at 110℃ for 24 hours, then kept at 300℃ for 24 hours, and can be put into use after natural cooling. The material of the castable refractory used for the coke oven lining includes the following raw materials in parts by weight: High-alumina bauxite with a particle size of 5mm to 8mm: 10 to 22 parts; Calcium hexaaluminate with a particle size of 3mm to 5mm: 20 to 38 parts; Calcined quartz with a particle size of 1mm to 3mm: 6 to 10 parts; Forsterite with a grain size ≤1mm: 11-21 parts; Magnesium aluminum spinel with a particle size of 180 mesh: 9-19 parts; Ethyl silicate: 2-7 parts; Hydrated alumina with a particle size less than 0.088 mm: 2-10 parts; Dextrin: 1-4 parts; Water-reducing agent: 1-3 parts.

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