CN110981449A - Steel ladle pocket brick thermal-state repairing material and preparation method thereof - Google Patents

Steel ladle pocket brick thermal-state repairing material and preparation method thereof Download PDF

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Publication number
CN110981449A
CN110981449A CN201911299666.0A CN201911299666A CN110981449A CN 110981449 A CN110981449 A CN 110981449A CN 201911299666 A CN201911299666 A CN 201911299666A CN 110981449 A CN110981449 A CN 110981449A
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Prior art keywords
ladle
percent
brick
equal
powder
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Inventor
青光红
罗天军
陈超
赵杰
边程军
高同昌
高亮
邓小兵
胡志豪
蒋发燕
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Gangcheng Group Liangshan Ruihai Industry Co ltd
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Gangcheng Group Liangshan Ruihai Industry Co ltd
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Priority to CN201911299666.0A priority Critical patent/CN110981449A/en
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    • C—CHEMISTRY; METALLURGY
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/101—Refractories from grain sized mixtures
    • C04B35/106—Refractories from grain sized mixtures containing zirconium oxide or zircon (ZrSiO4)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/02—Linings
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    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
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  • Inorganic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Abstract

The invention belongs to the technical field of steel-making ladle refractory materials, and particularly relates to a ladle pocket brick thermal-state repairing material and a preparation method thereof, aiming at the problems that a gas-permeable pocket and a nozzle pocket brick are easy to corrode and lose and the service life of the gas-permeable pocket and the nozzle pocket brick is shorter than that of other ladle pocket bricks, the ladle pocket brick thermal-state repairing material provided by the invention comprises, by weight, 39-43% of carbon-free ladle brick particles, 19-23% of zirconium corundum particles, 15-20% of white corundum powder, 8-10% of spinel fine powder, 8-10% of α aluminum oxide micro powder, 0.5-1% of silicon dust powder, 2-3% of pure calcium aluminate cement, 0.1% of high-efficiency water reducing agent and 0.05-0.1% of explosion-proof fiber.

Description

Steel ladle pocket brick thermal-state repairing material and preparation method thereof
Technical Field
The invention belongs to the technical field of steel-making ladle refractory materials, and particularly relates to a ladle brick cup thermal-state repairing material and a preparation method thereof.
Background
The maintenance of cold repair refractory materials of steel-making ladles is a semi-pouring and semi-building process, a ladle wall permanent layer, a ladle bottom permanent layer and a ladle bottom working layer are of a pouring type, the nozzle pocket bricks, the ventilating rotors, the ladle wall prefabricated bricks and the slag line bricks are of a building type, the maintenance and repair of the ladles are divided into major repair, minor repair and integral major repair according to the service life of the refractory materials of each part, the minor repair usually means the replacement and repair of the nozzle pocket bricks and the ventilating pocket bricks, the removal and re-building of the slag line bricks, the smearing of the ladle wall prefabricated bricks, the erosion parts of the slag line bricks and the like, the major repair usually means the replacement of the nozzle pocket bricks, the ventilating pocket bricks, the pouring ladle bottom permanent layer, the working layer refractory materials, the prefabricated bricks, the slag line bricks and the like, and the integral major repair usually means the removal and replacement of all the refractory materials of the ladles; the corrosion of the refractory materials of the steel-making ladle is roughly divided into a plurality of types, firstly, the molten steel erodes the bottom working layer of the ladle during tapping, and secondly, the steel slag violently turns over to corrode the refractory materials of all parts during the refining argon blowing process.
The air-permeable brick cup is positioned near a steel tapping steel facing area, and because the air-permeable brick cup is higher than the refractory material of the ladle bottom working layer, although the air-permeable brick cup does not directly face steel, the higher refractory material of the brick cup is still indirectly scoured by molten steel; moreover, when the refractory materials of the bottom-wrapping working layer at the periphery of the air-permeable brick cup are constructed and poured, due to the difference of the volume densities of the aggregate and the powder, part of the powder floats upwards in the construction and pouring process, so that the materials are easy to corrode and lose in the tapping process and the refining argon blowing process; the process can accelerate the erosion of the surfaces of the air permeable seat and the nozzle brick at different degrees, so that the air permeable seat and the nozzle brick reach the service life in advance, and the minor repair is carried out in advance, and the times of the minor repair are increased, thereby influencing the normal turnover of the steel-making ladle.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the permeable seat and the nozzle seat brick are easy to be corroded and damaged, and the service life is shorter than that of other ladle seat bricks.
The invention provides a hot-state repairing material for a ladle brick cup, which comprises, by weight, 39-43% of a carbon-free ladle brick, 19-23% of zirconia corundum, 15-20% of white corundum powder, 8-10% of spinel fine powder, 8-10% of α aluminum oxide fine powder, 0.5-1% of silicon dust powder, 2-3% of pure calcium aluminate cement, 0.1% of a high-efficiency water reducing agent and 0.05-0.1% of an explosion-proof fiber.
In the hot-state repairing material for the ladle pocket brick, 21-23% of particles with the particle size of 8-12 mm and 18-20% of particles with the particle size of 3-8 mm are contained in the carbon-free ladle brick.
In the hot-state repairing material for the ladle brick cup, 10-12% of particles with the particle size of 1-3 mm in the corundum-zirconia and 9-11% of particles with the particle size of 0.074-1 mm are contained.
In the ladle brick cup thermal-state repairing material, the grain diameters of the white corundum powder and the spinel fine powder are less than 0.044 mm.
Wherein, in the ladle brick cup hot-state repairing material, the particle size of the α alumina micropowder is less than 0.005 mm.
In the ladle brick cup hot-state repairing material, the particle sizes of the silicon dust powder and the pure calcium aluminate cement are less than 0.074 mm.
Wherein, in the ladle brick cup hot-state repairing material, the aluminum oxide of the carbon-free ladle brick particles is more than or equal to 90 percent.
Wherein, in the ladle brick cup hot-state repairing material, the zirconia corundum contains more than or equal to 50 percent of alumina and more than or equal to 25 percent of zirconia.
Wherein, in the steel ladle pocket brick hot-state repairing material, the white corundum powder contains more than or equal to 98 percent of aluminum oxide.
Wherein, in the ladle brick cup hot-state mending material, the spinel fine powder contains more than or equal to 65 percent of aluminum oxide and more than or equal to 20 percent of magnesium oxide.
Wherein, in the ladle brick cup hot-state repairing material, the α alumina micropowder contains alumina more than or equal to 98 percent.
Wherein, in the ladle pocket brick hot-state patching material, the pure calcium aluminate cement contains more than or equal to 65 percent of aluminum oxide, less than or equal to 30 percent of calcium oxide and is CA-70.
Wherein, in the ladle brick cup hot-state repairing material, the silicon dust powder contains silicon dioxide more than or equal to 94 percent.
In the ladle brick cup thermal-state repairing material, the corresponding brand of the explosion-proof fiber is JX-3-3.
In the ladle brick cup thermal-state repairing material, the high-efficiency water reducing agent is a water reducing agent of the grade FS-10 produced by Wuhanshan chemical industry.
The ladle brick cup thermal-state repairing material comprises the following chemical components: by weight percent, Al2O3≥75％，ZrO2≥5％，CaO≤1％。
Wherein, in the ladle brick cup thermal-state repairing material, the sum of the water contents of the raw materials is less than or equal to 1 percent.
The invention also provides a preparation method of the steel ladle pocket brick thermal-state repairing material, which comprises the following steps:
weighing the raw materials according to the weight ratio, and stirring and mixing uniformly.
In the preparation method of the steel ladle pocket brick thermal-state repairing material, the stirring time is more than or equal to 5 min.
Compared with the prior art, the invention has the beneficial effects that:
the hot-state repairing material for the ladle pocket brick provided by the invention has the advantages of good self-flowing performance, excellent sintering performance, small linear change rate, good air permeability and the like, has certain medium and high temperature bending strength and slag corrosion resistance, can effectively solve the problem of inconsistent service life of the ladle pocket brick and refractory materials at other parts, reduces repairing times and labor intensity, and has important practical significance.
Detailed Description
The invention provides a hot-state repairing material for a ladle brick cup, which comprises, by weight, 39-43% of a carbon-free ladle brick, 19-23% of zirconia corundum, 15-20% of white corundum powder, 8-10% of spinel fine powder, 8-10% of α aluminum oxide micro powder, 0.5-1% of silicon dust powder, 2-3% of pure calcium aluminate cement, 0.1% of a high-efficiency water reducing agent and 0.05-0.1% of an explosion-proof fiber.
In the hot-state repairing material for the ladle pocket brick, 21-23% of particles with the particle size of 8-12 mm and 18-20% of particles with the particle size of 3-8 mm are contained in the carbon-free ladle brick.
In the hot-state repairing material for the ladle brick cup, 10-12% of particles with the particle size of 1-3 mm in the corundum-zirconia and 9-11% of particles with the particle size of 0.074-1 mm are contained.
In the ladle brick cup thermal-state repairing material, the grain diameters of the white corundum powder and the spinel fine powder are less than 0.044 mm.
Wherein, in the ladle brick cup hot-state repairing material, the particle size of the α alumina micropowder is less than 0.005 mm.
In the ladle brick cup hot-state repairing material, the particle sizes of the silicon dust powder and the pure calcium aluminate cement are less than 0.074 mm.
The ladle brick cup hot-state repairing material is mainly used for repairing a pit of 10-820 cm, so that the particle size of a raw material of the repairing material is set within the range and is mainly determined by the size and the volume of the repaired pit. Different raw materials are set to different particle sizes and keep continuity, so that the fire resistance can be improved.
Wherein, in the ladle brick cup hot-state repairing material, the aluminum oxide of the carbon-free ladle brick particles is more than or equal to 90 percent.
Wherein, in the ladle brick cup hot-state repairing material, the zirconia corundum contains more than or equal to 50 percent of alumina and more than or equal to 25 percent of zirconia.
Wherein, in the steel ladle pocket brick hot-state repairing material, the white corundum powder contains more than or equal to 98 percent of aluminum oxide.
Wherein, in the ladle brick cup hot-state mending material, the spinel fine powder contains more than or equal to 65 percent of aluminum oxide and more than or equal to 20 percent of magnesium oxide.
Wherein, in the ladle brick cup hot-state repairing material, the α alumina micropowder contains alumina more than or equal to 98 percent.
Wherein, in the ladle pocket brick hot-state patching material, the pure calcium aluminate cement contains more than or equal to 65 percent of aluminum oxide, less than or equal to 30 percent of calcium oxide and is CA-70.
Wherein, in the ladle brick cup hot-state repairing material, the silicon dust powder contains silicon dioxide more than or equal to 94 percent.
In the ladle brick cup thermal-state repairing material, the corresponding brand of the explosion-proof fiber is JX-3-3.
In the ladle brick cup thermal-state repairing material, the high-efficiency water reducing agent is a water reducing agent of the grade FS-10 produced by Wuhanshan chemical industry.
The invention combines the ladle brick cup material to innovate and select the raw material. The original brick cup is made of high-alumina materials and is formed by organically combining and sintering. In order to give consideration to the economic property and the performance requirement of the repairing material, the invention particularly selects the carbon-free ladle brick particles and the corundum-zirconia particles to be processed into proper particle size to be used as the aggregate component of the hot repairing material of the ladle brick cup. The carbon-free ladle brick particles and the corundum-zirconia particles are recycled, the sources are rich, the production cost is low, and a new utilization way is developed.
The invention collects the non-carbon ladle brick of the secondary refractory resource, and uses the non-carbon ladle brick in various particle sizes through crushing and screening, and compared with other high-alumina materials, the processed non-carbon ladle brick aggregate has better economic advantages except almost no difference in performance. The secondary refractory material zirconium corundum brick aggregate which is collected contains ZrO2The content of the high-viscosity glass can reach more than 25 percent, and a high-viscosity glass phase can be formed at high temperature, so that the slag corrosion resistance and the sintering performance of the repair material are further improved. The high-alumina cement is combined with the spinel fine powder, so that the medium-temperature sintering strength of the repair material can be further improved. Shortened sinteringTime. The high-efficiency water reducing agent selected by the invention can enable the repairing material to have good flowing property under the condition of less water addition, can quickly fill the pits for repairing at high temperature, and has the advantages of simple operation, environmental protection and the like compared with the condition that organic asphalt and the like are used as flowing agents. The explosion-proof fiber selected by the invention can form a through air hole in the repairing material, so that the repaired brick cup keeps air permeability.
The ladle brick cup thermal-state repairing material comprises the following chemical components: by weight percent, Al2O3≥75％，ZrO2≥5％，CaO≤1％。
Wherein, in the ladle brick cup thermal-state repairing material, the sum of the water contents of the raw materials is less than or equal to 1 percent. As the preparation process of the patching material contains powder, caking can be caused due to overhigh moisture, so that the hot patching material for the ladle brick cup cannot be used, and the moisture content of the raw materials needs to be controlled.
The invention also provides a preparation method of the steel ladle pocket brick thermal-state repairing material, which comprises the following steps:
weighing the raw materials according to the weight ratio, and stirring and mixing uniformly.
In the preparation method of the steel ladle pocket brick thermal-state repairing material, the stirring time is more than or equal to 5 min.
The repairing material of the invention adopts a water combination mode for repairing, 4-5% of water is needed to be added when the repairing material is used, the self-flowing can be met, the adding through a conduit is similar to the adding mode of the drainage sand in some steel mills, compared with the existing organic dry method combination, the smoke dust generated by the combustion of the organic binding agent can be reduced, and the environment is more friendly. After the repair material is repaired, the water is heated and evaporated, and the water vapor forms through air holes among the repair material under the dredging of the explosion-proof fibers, so that the air permeability is improved.
The following examples are given to further illustrate the embodiments of the present invention, but are not intended to limit the scope of the present invention to the examples.
The results of the physicochemical indexes of the raw materials used in the examples, such as the carbon-free ladle brick aggregate, the zirconia alumina aggregate, the white corundum powder, the α activated alumina micropowder, the silica fume, the pure calcium aluminate cement (CA-70), and the like, are shown in Table 1.
Physical and chemical properties of hot-state repairing material raw materials of ladle pocket bricks in the examples in Table 1
Figure BDA0002321532630000041
The above raw materials were formulated into a repair material, which satisfied the properties shown in table 2.
TABLE 2 physical and chemical indexes of hot repairing material for ladle brick cup
Figure BDA0002321532630000042
Figure BDA0002321532630000051
Example 1 preparation of thermal-state repairing material for ladle brick cup of the present invention
The raw materials of the repair material are shown in the following table 3:
table 3 raw materials formulation 1
Figure BDA0002321532630000052
The ladle brick cup hot-state repairing material after burdening, stirring and packaging is sampled and detected according to sampling regulations, and the physical and chemical detection results are shown in table 4:
table 4 example 1 steel ladle pocket brick thermal state repairing material physical and chemical detection index
Item The detection result is%
Al2O3，％ 86.07
CaO，％ 0.5
ZrO2，％ 6.6
Volume density (110 ℃ C.. times.24 h), g/cm3 3.07
Flexural strength (1000 ℃ is multiplied by 3h), MPa 7.24
Breaking strength (1550 ℃ X3 h), MPa 10.13
Linear rate of change (1550 ℃ X3 h)% -0.2
Example 1 a 5 ton ladle brick hot repair mix was sent to a hot repair area and 3 test tank data were collected along with 3 comparative tank data for an organically bonded hot repair mix for a data pair as shown in table 5:
TABLE 5 comparison of test data
Figure BDA0002321532630000061
According to experimental results, the steel ladle brick cup hot-state repairing material developed by the invention has good construction conditions, can be repaired without operating a tilting machine, and the contrast tank is an organically-combined dry-method repairing material, so that the fluidity can be generated after the organic binder is melted, the tilting machine needs to be manually operated to meet the repairing conditions, and the construction time of the test tank is saved by nearly one time; in the sintering process, the test tank has no smoke dust, the sintering time is averagely 34 minutes, while the bonding agent of the comparative tank burns to generate a large amount of smoke dust to influence the surrounding environment, and the sintering time is averagely 45 minutes; in the online use process, compared with the argon blowing effect in the electric heating process, the test tank is larger than the comparison tank, and the air permeability is superior; the steel ladle pocket brick thermal-state mending material meets the condition of matching the service life of other refractory materials after being used, the contrast tank is an organically combined mending material, the uniformity of the material is smaller than that of a water-combined mending material, and the construction process is limited by manpower, so that series quality problems are caused.
Example 2 preparation of the thermal-state repairing material for ladle brick cup of the present invention
The raw materials of the repair material are shown in the following table 6:
table 6 example of formulation 2
Figure BDA0002321532630000062
Figure BDA0002321532630000071
The ladle brick cup hot-state repairing material after burdening, stirring and packaging is sampled and detected according to sampling regulations, and the physical and chemical detection results are shown in table 7:
table 7 example 2 physical and chemical detection indexes of hot patching material for ladle brick cup
Item The detection result is%
Al2O3，％ 85.74
CaO，％ 0.5
ZrO2，％ 6.3
Volume density (110 ℃ C.. times.24 h), g/cm3 2.95
Flexural strength (1000 ℃ is multiplied by 3h), MPa 7.11
Breaking strength (1550 ℃ X3 h), MPa 9.5
Linear rate of change (1550 ℃ X3 h)% 0.2
Example 2 a 5 ton ladle brick hot repair mix was sent to a hot repair area and 3 test tank data were collected along with 3 comparison tank data for an organically bonded hot repair mix for a data pair as shown in table 8:
TABLE 8 comparison of test data
Figure BDA0002321532630000072
Figure BDA0002321532630000081
The data comparison shows that the steel ladle brick cup hot-state repair material developed by the invention has good construction conditions, can be repaired without operating a tilting machine, the comparison tank adopts an organic combined dry-process repair material, the fluidity can be generated after the organic bonding agent is melted, the manual operation of the tilting machine is required to meet the repair conditions, the construction time of the test tank is 9.6min for comparison for 19.6min, and the 10min is saved; in the sintering process, the test tank has no smoke dust, the sintering time is averagely 33.6 minutes, while the bonding agent of the comparative tank burns to generate a large amount of smoke dust, so that the surrounding environment is influenced, and the sintering time is averagely 42.6 minutes; in the online use process, compared with the argon blowing effect in the electric heating process, the test tank is larger than the comparison tank, and the air permeability is superior; the contrast tank and the test tank meet the condition of matching with the service life of other refractory materials after being used, and no corresponding quality problem occurs.
From the experimental results of the examples, it can be seen that: the ladle brick cup hot-state repairing material disclosed by the invention is good in application condition in hot-state repairing of a steel-making ladle; the repair method has the advantages of excellent construction performance, small environmental influence, less time consumption, capability of keeping consistency with the service life of other refractory materials after repair, capability of effectively reducing repair times and labor intensity, and wide application prospect.

Claims (10)

1. The steel ladle pocket brick thermal-state repairing material is characterized by comprising, by weight, 39-43% of a carbon-free steel ladle brick, 19-23% of zirconia corundum, 15-20% of white corundum powder, 8-10% of spinel fine powder, 8-10% of α aluminum oxide micro powder, 0.5-1% of silicon dust powder, 2-3% of pure calcium aluminate cement, 0.1% of a high-efficiency water reducing agent and 0.05-0.1% of an explosion-proof fiber.
2. The ladle brick cup thermal-state repair material according to claim 1, which is characterized in that: the carbon-free ladle brick comprises 21-23% of particles with the particle size of 8-12 mm and 18-20% of particles with the particle size of 3-8 mm.
3. The ladle brick cup thermal-state repair material according to claim 1, which is characterized in that: the zirconia corundum particles with the particle size of 1-3 mm are 10-12%, and the powder with the particle size of 0.074-1 mm is 9-11%.
4. The ladle brick cup thermal-state repair material according to claim 1, which is characterized in that: the grain diameter of the white corundum powder and the spinel fine powder is less than 0.044 mm.
5. The ladle brick cup hot-state repair material as claimed in claim 1, wherein the particle size of the α alumina micropowder is less than 0.005 mm.
6. The ladle brick cup thermal-state repair material according to claim 1, which is characterized in that: the particle size of the silicon dust powder and the pure calcium aluminate cement is less than 0.074 mm.
7. The ladle pocket brick thermal-state repairing material according to claim 1, characterized by satisfying at least one of the following conditions:
the aluminum oxide of the carbon-free steel ladle brick particles is more than or equal to 90 percent;
the zirconia corundum contains more than or equal to 50 percent of aluminum oxide and more than or equal to 25 percent of zirconia;
the content of aluminum oxide in the white corundum powder is more than or equal to 98 percent;
the spinel fine powder contains more than or equal to 65 percent of aluminum oxide and more than or equal to 20 percent of magnesium oxide;
the α aluminum oxide micro powder contains more than or equal to 98 percent of aluminum oxide;
the pure calcium aluminate cement contains more than or equal to 65 percent of aluminum oxide, less than or equal to 30 percent of calcium oxide and is CA-70 in type;
the silicon dust contains silicon dioxide more than or equal to 94 percent;
the corresponding brand of the explosion-proof fiber is JX-3-3;
the high-efficiency water reducing agent is a water reducing agent of grade FS-10 produced by Wuhan Shangda chemical industry.
8. The ladle brick cup thermal-state repair material according to claim 1, which is characterized by comprising the following chemical components: by weight percent, Al2O3≥75％，ZrO2≥5％，CaO≤1％。
9. The preparation method of the ladle pocket brick thermal-state repair material as claimed in any one of claims 1 to 8, characterized by comprising the following steps:
weighing the raw materials according to the weight ratio, and stirring and mixing uniformly.
10. The preparation method of the ladle pocket brick thermal-state repair material according to claim 9, characterized by comprising the following steps: the stirring time is more than or equal to 5 min.
CN201911299666.0A 2019-12-17 2019-12-17 Steel ladle pocket brick thermal-state repairing material and preparation method thereof Pending CN110981449A (en)

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