A converter nozzle lining repair material and a method for preparing and using the same

Abstract

The present application belongs to the field of refractory materials for converter tapping hole in the steel industry, and particularly relates to a converter tapping hole lining repair material, a preparation method and a use method thereof. The repair material takes waste and old magnesite-carbon brick, magnesium-calcium sand, aluminum-magnesium spinel, ordinary augite, montmorillonite, semi-coke, and waste and old aluminum-zirconium-carbon brick as main materials, takes ZnO as an additive, and takes aluminum sol as a binder. The tapping hole lining is repaired by using the material. The repair material has high temperature resistance, strong slag, molten steel erosion and scouring resistance, high bonding strength with the matrix, and good thermal shock stability. The tapping hole lining can be repaired on line, and the service life of the repair material is more than 150 heats, so that the overall service life of the tapping hole is increased from about 220 heats to more than 370 heats, the overall service life of the tapping hole is greatly prolonged, the brick lining is fully utilized, and the resource utilization maximization is realized. Meanwhile, the cost of the tapping hole is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of refractory materials for converter tapping hole in the steel industry, and particularly relates to a converter tapping hole lining repair material and a preparation and use method thereof. BACKGROUND

[0002] The converter tapping hole is an important part of converter production, and is the only channel for molten steel to enter the ladle from the converter. The converter tapping hole has two structures, i.e., a split structure and a whole structure, and generally has a square or circular shape, and the inner hole is circular. During tapping, the position is subjected to high temperature and oxidation of molten steel, and the working condition is extremely harsh. If the tapping hole position is not properly maintained, the production time, molten steel quality and production stability are affected, and a vicious accident is easily caused, which has an unpredictable consequence. In recent years, extending the service life of the tapping hole and improving the tapping quality have attracted more and more attention of the producers. In the existing technical means at home and abroad, the service life of the tapping hole is mainly extended by optimizing the hot change tapping hole process, improving the structure and material of the tapping hole, reducing the tapping temperature, and tapping hole slag protection. However, with the increase of tapping amount, the inner lining of the tapping hole is continuously eroded, and the inner diameter is continuously expanded, so that a new tapping hole has to be replaced. However, the tapping hole still has a certain thickness at this time, so that the old lining bricks cannot be reused, resources are wasted, and the cost of refractory materials is not conducive to reduction. Meanwhile, the replacement of the tapping hole takes a long time, affects the production rhythm of the front and rear processes, and the labor intensity of the operator is large.

[0003] In view of the existing problems, in order to further improve the service life of the tapping hole and make full use of the lining bricks of the tapping hole to maximize the utilization of resources, the present application provides a converter tapping hole lining repair material with stable performance, excellent corrosion resistance, high adhesion rate and high bonding strength. By performing online rapid hot repair on the lining of the tapping hole, the service life of the tapping hole is greatly improved, the production cost of refractory materials is reduced, resource waste is reduced, and the requirements of continuous production operation of the converter steelmaking are met. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a tapping hole lining repair material with excellent performance. The repair material is resistant to high temperature, has strong slag and molten steel corrosion and erosion resistance, has high bonding strength with the substrate, has good thermal shock stability, and can greatly improve the service life of the tapping hole after one repair.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0006] The main materials are waste and old magnesite carbon bricks, magnesium calcium sand, aluminum magnesium spinel, ordinary augite, montmorillonite, semicoke and waste and old aluminum zirconium carbon bricks, the additive is ZnO, and the binder is aluminum sol. The lining of the tapping hole is repaired by using the material.

[0007] The technical problem to be solved by the present application is solved by the following technical scheme: a converter tapping hole inner lining repair material, the repair material comprises the following raw materials by mass fraction:

[0008] waste magnesium carbon brick with a particle size of 3mm-5mm: 10-20 parts;

[0009] magnesium-calcium sand with a particle size of 1mm-3mm: 20-40 parts;

[0010] aluminum magnesium spinel with a particle size of 1mm-3mm: 5-10 parts;

[0011] ordinary pyroxene with a particle size of less than 2mm: 10-20 parts;

[0012] montmorillonite with a particle size of less than 1mm: 10-20 parts;

[0013] lanthanum coal with a particle size of 200 mesh: 2-7 parts;

[0014] waste aluminum zirconium carbon brick with a particle size of less than 0.088mm: 2-10 parts;

[0015] aluminum sol: 1-5 parts;

[0016] ZnO with a particle size of 200 mesh: 1-3 parts.

[0017] According to the present application, the repair material comprises the following raw materials by mass fraction:

[0018] waste magnesium carbon brick with a particle size of 3mm-5mm: 15-20 parts;

[0019] magnesium-calcium sand with a particle size of 1mm-3mm: 23-35 parts;

[0020] aluminum magnesium spinel with a particle size of 1mm-3mm: 8-10 parts;

[0021] ordinary pyroxene with a particle size of less than 2mm: 12-15 parts;

[0022] montmorillonite with a particle size of less than 1mm: 12-18 parts;

[0023] lanthanum coal with a particle size of 200 mesh: 3-6 parts;

[0024] waste aluminum zirconium carbon brick with a particle size of less than 0.088mm: 3-8 parts;

[0025] aluminum sol: 2-4 parts;

[0026] ZnO with a particle size of 200 mesh: 2-3 parts.

[0027] According to the present application, the repair material comprises the following raw materials by mass fraction:

[0028] Waste magnesium carbon brick with particle size of 3mm-5mm: 17-20 parts;

[0029] Magnesium calcium sand with particle size of 1mm-3mm: 27-32 parts;

[0030] Aluminum magnesium spinel with particle size of 1mm-3mm: 8-10 parts;

[0031] Ordinary pyroxene with particle size of ≤2mm: 12-15 parts;

[0032] Montmorillonite with particle size of ≤1mm: 14-16 parts;

[0033] Green coke with particle size of 200 mesh: 4-6 parts;

[0034] Waste aluminum zirconium carbon brick with particle size of less than 0.088mm: 4-6 parts;

[0035] Aluminum sol: 2-3 parts;

[0036] ZnO with particle size of 200 mesh: 2-3 parts.

[0037] According to the application, preferably, the repairing material comprises the following raw materials by mass:

[0038] Waste magnesium carbon brick with particle size of 3mm-5mm: 18-20 parts;

[0039] Magnesium calcium sand with particle size of 1mm-3mm: 28-30 parts;

[0040] Aluminum magnesium spinel with particle size of 1mm-3mm: 8-10 parts;

[0041] Ordinary pyroxene with particle size of ≤2mm: 12-13 parts;

[0042] Montmorillonite with particle size of ≤1mm: 15-16 parts;

[0043] Green coke with particle size of 200 mesh: 5-6 parts;

[0044] Waste aluminum zirconium carbon brick with particle size of less than 0.088mm: 4-5 parts;

[0045] Aluminum sol: 2-3 parts;

[0046] ZnO with particle size of 200 mesh: 2-3 parts.

[0047] The application further discloses a preparation method of the converter tapping hole lining repairing material.

[0048] The application further discloses a method for using the converter tapping hole inner lining repairing material.

[0049] Compared with the prior art, the application has the advantages that:

[0050] 1. The converter tapping hole inner lining can be repaired on line by using the repairing material, and the service life of one repair is more than 150 times, so that the service life of the converter tapping hole is increased from about 220 times to more than 370 times.

[0051] 2. The converter tapping hole brick lining is fully utilized by using the repairing material, and the resource utilization is maximized.

[0052] 3. The cost of the converter tapping hole is greatly reduced.

[0053] 4. The repairing material has high high-temperature resistance, strong slag and molten steel erosion and scouring resistance, high bonding strength with the base body and good thermal shock stability.

[0054] 5. The repairing material can be applied to the working requirements of the converter tapping hole, and the main physical and chemical indexes are as follows:

[0055] Firing temperature (℃) > 1850

[0056] Bulk density (g / cm 3 ) ≥ 2.6 (110℃×24h); ≥ 3.0 (1800℃×24h)

[0057] Compressive strength (MPa) ≥ 45 (110℃×24h); ≥ 72 (1800℃×24h)

[0058] Flexural strength (MPa) ≥ 15 (110℃×24h); ≥ 19 (18000℃×24h)

[0059] Linear change after firing (%) ± 0.1 (1550℃×24h)

[0060] Thermal shock stability (times) ≥ 9 (1100℃ water cooling). DETAILED DESCRIPTION

[0061] The following examples are further illustrations of the application, but the application is not limited thereto.

[0062] Example 1

[0063] Example 1 provides a converter tapping hole inner lining repairing material, and the raw material formula is shown in Table 1:

[0064] The various materials are weighed according to the proportions described in Table 1, put into a blender and mixed and stirred for 7-10 minutes to obtain a uniform repair material, which is packed for use.

[0065] The semi-dry method is used to repair the lining of the converter tapping hole on line, the water amount is 5-8% of the total weight of the material, and the repaired tapping hole can be used half an hour after the repair. The main physical and chemical indexes are as follows:

[0066] Refractory temperature (°C) >1850

[0067] Bulk density (g / cm 3 ) 2.6 (110°C x 24h); 3.1 (1800°C x 24h)

[0068] Compressive strength (MPa) 46 (110°C x 24h); 75 (1800°C x 24h)

[0069] Flexural strength (MPa) 15 (110°C x 24h); 19 (18000°C x 24h)

[0070] Linear change after firing (%) ±0.1 (1550°C x 24h)

[0071] Thermal shock resistance (times) 10 (1100°C water cooling).

[0072] Example 2

[0073] Example 2 provides a converter tapping hole lining repair material, the raw material formula of which is shown in Table 1:

[0074] The preparation and use method of the repair material of the example are the same as those of Example 1, and the main physical and chemical indexes are as follows:

[0075] Refractory temperature (°C) >1850

[0076] Bulk density (g / cm 3 ) 2.6 (110°C x 24h); 3.0 (1800°C x 24h)

[0077] Compressive strength (MPa) 45 (110°C x 24h); 73 (1800°C x 24h)

[0078] Flexural strength (MPa) 15 (110°C x 24h); 19 (18000°C x 24h)

[0079] Linear change after firing (%) ±0.1 (1550°C x 24h)

[0080] Thermal shock resistance (times) 10 (1100°C water cooling).

[0081] Example 3

[0082] Example 3 provides a converter taphole lining repair material, whose raw material formula is shown in Table 1:

[0083] The preparation and use method of the repair material of this example is the same as that of Example 1, and its main physical and chemical indexes are as follows:

[0084] Refractory temperature (°C) >1850

[0085] Bulk density (g / cm 3 ) 2.7 (110°C x 24h); 3.2 (1800°C x 24h)

[0086] Compressive strength (MPa) 46 (110°C x 24h); 73 (1800°C x 24h)

[0087] Flexural strength (MPa) 16 (110°C x 24h); 20 (18000°C x 24h)

[0088] Linear change after firing (%) ±0.1 (1550°C x 24h)

[0089] Thermal shock stability (times) 11 (1100°C water cooling).

[0090] Example 4

[0091] Example 4 provides a converter taphole lining repair material, whose raw material formula is shown in Table 1:

[0092] The preparation and use method of the repair material of this example is the same as that of Example 1, and its main physical and chemical indexes are as follows:

[0093] Refractory temperature (°C) >1850

[0094] Bulk density (g / cm 3 ) 2.7 (110°C x 24h); 3.0 (1800°C x 24h)

[0095] Compressive strength (MPa) 45 (110°C x 24h); 74 (1800°C x 24h)

[0096] Flexural strength (MPa) 16 (110°C x 24h); 19 (18000°C x 24h)

[0097] Linear change after firing (%) ±0.1 (1550°C x 24h)

[0098] Thermal shock stability (times) 9 (1100°C water cooling).

[0099] Example 5

[0100] Example 5 provides a converter taphole lining repair material, whose raw material formula is shown in Table 1:

[0101] The preparation and use method of the patching material of the example are same with example 1, and the main physical and chemical indexes are as follows:

[0102] Firing temperature (℃) >1850

[0103] Bulk density (g / cm 3 ) 2.6 (110℃x24h); 3.0 (1800℃x24h)

[0104] Compressive strength (MPa) 46 (110℃x24h); 72 (1800℃x24h)

[0105] Flexural strength (MPa) 15 (110℃x24h); 19 (18000℃x24h)

[0106] Linear change after firing (%) ±0.1 (1550℃x24h)

[0107] Thermal shock stability (times) 12 (1100℃ water cooling).

[0108] Example 6

[0109] Example 6 provides a converter tapping hole inner lining patching material, and the raw material formula is shown in Table 1:

[0110] The preparation and use method of the patching material of the example are same with example 1, and the main physical and chemical indexes are as follows:

[0111] Firing temperature (℃) >1850

[0112] Bulk density (g / cm 3 ) 2.7 (110℃x24h); 3.3 (1800℃x24h)

[0113] Compressive strength (MPa) 47 (110℃x24h); 76 (1800℃x24h)

[0114] Flexural strength (MPa) 16 (110℃x24h); 22 (18000℃x24h)

[0115] Linear change after firing (%) ±0.1 (1550℃x24h)

[0116] Thermal shock stability (times) 9 (1100℃ water cooling).

[0117] Example 7

[0118] Example 7 provides a converter tapping hole inner lining patching material, and the raw material formula is shown in Table 1:

[0119] The preparation and use method of the patching material of the example are same with example 1, and the main physical and chemical indexes are as follows:

[0120] Fire resistance temperature (°C) >1850

[0121] Bulk density (g / cm 3 ) 2.6 (110°C x 24h); 3.1 (1800°C x 24h)

[0122] Compressive strength (MPa) 45 (110°C x 24h); 73 (1800°C x 24h)

[0123] Flexural strength (MPa) 16 (110°C x 24h); 20 (18000°C x 24h)

[0124] Linear change after burning (%) ±0.1 (1550°C x 24h)

[0125] Thermal shock stability (times) 10 (1100°C water cooling).

[0126] Table 1 Raw material formulation table of examples 1-7

[0127] Unit: mass parts (parts)

[0128]

[0129] The converter tapping hole inner lining repair material in examples 1-7 can be used for on-line hot repair of the converter tapping hole inner lining by semi-dry method, and has high temperature resistance, strong slag and molten steel erosion and scouring resistance, high bonding strength with the matrix, good thermal shock stability, and effectively improves the service life of the tapping hole.

Claims

1. A converter nozzle lining repair material, characterized by, The repairing material comprises the following raw materials by mass fraction: waste magnesium carbon brick with particle size of 3mm-5mm: 10-20 parts; magnesium calcium sand with particle size of 1mm-3mm: 20-40 parts; aluminum magnesium spinel with particle size of 1mm-3mm: 5-10 parts; ordinary augite with particle size of ≤2mm: 10-20 parts; montmorillonite with particle size of ≤1mm: 10-20 parts; lanthanum carbon with particle size of 200 mesh: 2-7 parts; waste aluminum zirconium carbon brick with particle size less than 0.088mm: 2-10 parts; aluminum sol: 1-5 parts; ZnO with particle size of 200 mesh: 1-3 parts.

2. The converter nozzle lining repair material according to claim 1, characterized by The repairing material comprises the following raw materials by mass fraction: waste magnesium carbon brick with particle size of 3mm-5mm: 15-20 parts; magnesium calcium sand with particle size of 1mm-3mm: 23-35 parts; aluminum magnesium spinel with particle size of 1mm-3mm: 8-10 parts; ordinary augite with particle size of ≤2mm: 12-15 parts; montmorillonite with particle size of ≤1mm: 12-18 parts; lanthanum carbon with particle size of 200 mesh: 3-6 parts; waste aluminum zirconium carbon brick with particle size less than 0.088mm: 3-8 parts; aluminum sol: 2-4 parts; ZnO with particle size of 200 mesh: 2-3 parts.

3. The converter nozzle lining repair material according to claim 1, characterized by The repairing material comprises the following raw materials by mass fraction: waste magnesium carbon brick with particle size of 3mm-5mm: 17-20 parts; magnesium calcium sand with particle size of 1mm-3mm: 27-32 parts; aluminum magnesium spinel with particle size of 1mm-3mm: 8-10 parts; ordinary augite with particle size of ≤2mm: 12-15 parts; montmorillonite with particle size of ≤1mm: 14-16 parts; lanthanum carbon with particle size of 200 mesh: 4-6 parts; waste aluminum zirconium carbon brick with particle size less than 0.088mm: 4-6 parts; aluminum sol: 2-3 parts; ZnO with particle size of 200 mesh: 2-3 parts.

4. The converter nozzle lining repair material according to claim 1, characterized by The repairing material comprises the following raw materials by mass fraction: waste magnesium carbon brick with particle size of 3mm-5mm: 18-20 parts; magnesium calcium sand with particle size of 1mm-3mm: 28-30 parts; aluminum magnesium spinel with particle size of 1mm-3mm: 8-10 parts; ordinary augite with particle size of ≤2mm: 12-13 parts; montmorillonite with particle size of ≤1mm: 15-16 parts; lanthanum carbon with particle size of 200 mesh: 5-6 parts; waste aluminum zirconium carbon brick with particle size less than 0.088mm: 4-5 parts; aluminum sol: 2-3 parts; ZnO with particle size of 200 mesh: 2-3 parts.

5. A method for producing a repair material for a lining of a converter nozzle according to any one of claims 1 to 4, characterized in that: According to the respective ratio, the waste magnesium carbon brick, magnesium calcium sand, aluminum magnesium spinel, ordinary augite, montmorillonite, lanthanum carbon, waste aluminum zirconium carbon brick, aluminum sol and ZnO are poured into a mixer for mixing, and the mixing and stirring time is 7-10 minutes, so that the uniform repairing material is obtained.

6. A method of using the repair material for the inner lining of the converter nozzle according to any one of claims 1 to 4, characterized in that: The semi-dry method is used to spray the converter tapping hole lining for on-line hot repairing, and the water amount is 5%-8% of the total weight of the repairing material, and the tapping hole can be put into use half an hour after the spraying is completed.

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