CN112592193A - Ladle cover castable and preparation method thereof - Google Patents

Ladle cover castable and preparation method thereof Download PDF

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Publication number
CN112592193A
CN112592193A CN202110229698.4A CN202110229698A CN112592193A CN 112592193 A CN112592193 A CN 112592193A CN 202110229698 A CN202110229698 A CN 202110229698A CN 112592193 A CN112592193 A CN 112592193A
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China
Prior art keywords
parts
particle size
castable
ladle cover
alumina brick
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CN202110229698.4A
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Chinese (zh)
Inventor
王团收
周珂
崔志强
刘丽
贾祥超
颜浩
任林
李健
张盛
代克强
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Beijing Lier High Temperature Materials Co Ltd
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Beijing Lier High Temperature Materials Co Ltd
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Priority to CN202110229698.4A priority Critical patent/CN112592193A/en
Publication of CN112592193A publication Critical patent/CN112592193A/en
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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
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract

The invention provides a ladle cover castable and a preparation method thereof, wherein the ladle cover castable comprises the following components in parts by mass: 20-70 parts of waste high-alumina brick particles, 5-40 parts of flint clay, 1-30 parts of bauxite, 1-20 parts of silicon micropowder, 0.5-20 parts of green silicon carbide micropowder, 1-20 parts of pure calcium aluminate cement, 0.5-10 parts of steel fibers, 0.02-0.3 part of organic fibers, 0.5-20 parts of quartz sand, 0.05-1 part of water reducing agent and 0.005-0.2 part of retarder. The ladle cover castable has excellent performances of high adhesion rate, good mechanical property and long service life.

Description

Ladle cover castable and preparation method thereof
Technical Field
The invention belongs to the technical field of refractory material preparation, and particularly relates to a ladle cover castable and a preparation method thereof.
Background
The ladle plays an important role in receiving molten steel and refining outside the furnace in the metallurgical industry, and a ladle cover is generally required to be additionally arranged on the ladle in order to effectively prevent the situations of casting interruption, furnace return and the like caused by too fast temperature drop of the molten steel and simultaneously reduce the internal temperature fluctuation of the ladle during the operation of receiving the molten steel and empty ladle as far as possible. The steel ladle cover is positioned at the top of the steel ladle, does not directly contact with molten steel and does not bear the extrusion of the molten steel, so that most of heat radiation in the steel ladle can be effectively blocked, and the temperature in the steel ladle is kept stable.
In the actual production process, the situation that the part of the ladle cover refractory material falls into molten steel sometimes occurs, the refractory material blocks a water gap and steel cannot be poured normally seriously, the ladle cover steel plate is damaged directly due to the failure of the ladle cover refractory material sometimes, and the production rhythm is disturbed by the fracture of the ladle cover during slag turning. Therefore, the ladle cover castable with high adhesion rate, good mechanical property and long service life needs to be provided. Chinese patent publication No. CN106904981B discloses a lightweight mullite castable for ladle lids, which uses lightweight mullite spheres as aggregates, and has the effects of low bulk density, low thermal conductivity, and excellent thermal shock resistance, but still has poor compressive strength and rupture strength, and high production cost.
Disclosure of Invention
The invention aims to provide a ladle cover castable and a preparation method thereof, and the ladle cover castable has excellent properties of high adhesion rate, good mechanical property and long service life.
In order to solve the above problems, one aspect of the present invention provides a ladle cover castable, which comprises the following components:
20-70 parts of waste high-alumina brick particles, 5-40 parts of flint clay, 1-30 parts of bauxite, 1-20 parts of silicon micropowder, 0.5-20 parts of green silicon carbide micropowder, 1-20 parts of pure calcium aluminate cement, 0.5-10 parts of steel fibers, 0.02-0.3 part of organic fibers, 0.5-20 parts of quartz sand, 0.05-1 part of water reducing agent and 0.005-0.2 part of retarder.
The ladle cover castable has the advantages that through the blending of all the components in the raw materials and the interaction among the components, the obtained ladle cover castable is high in strength, high in adhesion rate and long in service life, does not contain carbon, cannot fall off in use, cannot pollute molten steel even if fall off, is long in service life, low in maintenance workload, reduces the maintenance frequency of the ladle cover, saves the use amount of refractory materials, and is good in economic benefit.
Wherein the waste high-alumina brick particles are obtained by crushing, removing impurities and screening off-line steel ladle or iron ladle high-alumina brick residual bricks in the field and then recycling. The invention adopts the waste high-alumina brick particles as the raw material, fully utilizes the waste resources, and has important significance for the development of circular economy and the reduction of the production cost of refractory materials. The flint clay has good thermal shock performance, so that the ladle cover castable has longer service life, and the flint clay has low cost, and can reduce the production cost of the ladle castable. The waste high-alumina brick particles and the flint clay are used as main raw materials, and the ladle cover castable has better mechanical strength through the mutual matching of the waste high-alumina brick particles and the flint clay. The green silicon carbide is a nonmetallic mineral product generated by taking quartz sand, petroleum coke and sodium chloride as basic raw materials at the high temperature of more than 1800 ℃, has the characteristics of high hardness, small expansion coefficient, brittle property, good heat conductivity and the like, and has higher hardness compared with the common black silicon carbide, so that the ladle cover castable has better strength and impact resistance. The quartz sand is subjected to crystal form conversion at the medium temperature, and can effectively compensate for shrinkage deformation generated in the using process of the ladle cover castable along with a certain amount of volume expansion.
Preferably, the preparation raw materials comprise the following components in parts by weight:
35-60 parts of waste high-alumina brick particles, 11-30 parts of flint clay, 5-15 parts of bauxite, 5-10 parts of silicon micropowder, 1-10 parts of green silicon carbide micropowder, 5-10 parts of pure calcium aluminate cement, 1-5 parts of steel fibers, 0.05-0.15 part of organic fibers, 1-10 parts of quartz sand, 0.1-0.5 part of water reducing agent and 0.01-0.1 part of retarder.
A large number of experimental researches show that when the preparation raw material proportion is adopted, the obtained ladle cover castable has more excellent strength performance, adhesion rate and service life, and the cost is lowest.
Preferably, the waste high-alumina brick particles comprise the following components in parts by weight:
10-15 parts of waste high-alumina brick particles with the particle size of 8-20mm, 5-15 parts of waste high-alumina brick particles with the particle size of 5-8mm, 10-15 parts of waste high-alumina brick particles with the particle size of 3-5mm and 10-15 parts of waste high-alumina brick particles with the particle size of 1-3 mm;
al in the waste high-alumina brick particles2O3The content of (A) is more than 80 wt%.
Preferably, the flint clay comprises the following components in parts by weight:
10-20 parts of flint clay with the grain diameter of 0.083-1mm and 1-10 parts of flint clay with the grain diameter of 0.074-0.083 mm;
al in the flint clay2O3The content of (A) is more than 43wt%, and the content of Si is more than 51 wt%.
Preferably, the particle size of the bauxite is 0.074-0.083 mm;
al in the bauxite2O3The content of (A) is more than 75 wt%.
Preferably, the particle size of the fine silica powder is 0.1 to 1 μm.
Preferably, the particle size of the green silicon carbide micro powder is 0.044-0.074 mm;
the content of SiC in the green silicon carbide micro powder is more than 97 wt%.
The addition amount of the fine powder has great influence on the adhesion rate of the ladle cover castable, and the adhesion rate of the ladle cover castable is higher by adding the flint clay fine powder with the grain diameter of 0.074-0.083mm, the bauxite fine powder with the grain diameter of 0.074-0.083mm and the green silicon carbide micro powder with the grain diameter of 0.044-0.074mm in certain parts by mass.
Preferably, the steel fibers have a length of 25-30 mm; the tensile strength, the compressive strength and the shear strength of the casting material can be greatly improved, the impact resistance of the casting material is improved, and the fatigue resistance is improved.
The organic fiber is ultrahigh molecular weight polyethylene fiber, the ultrahigh molecular weight polyethylene fiber is also called high-strength high-modulus polyethylene fiber, is the fiber with the highest specific strength and specific modulus in the world at present, and is the fiber spun by polyethylene with the molecular weight of 100-500 ten thousand.
Al in the pure calcium aluminate cement2O3The content of (B) is more than 70wt%
Preferably, the water reducing agent is a mixture of sodium tripolyphosphate and sodium hexametaphosphate.
Further preferably, the mass ratio of the sodium tripolyphosphate to the sodium hexametaphosphate in the water reducing agent is (1-5): 7.
further preferably, the mass ratio of the sodium tripolyphosphate to the sodium hexametaphosphate in the water reducing agent is 3: 7.
A large number of experimental trials find that the sodium tripolyphosphate and the sodium hexametaphosphate are matched together to be used as the water reducing agent, so that the water reducing agent is more efficient for the castable system, and the mixing water consumption can be reduced to the maximum.
Preferably, the set retarder is citric acid.
In another aspect of the present invention, a method for preparing the ladle cover castable is provided, which comprises the following steps:
and mixing the preparation raw materials of the ladle cover castable to obtain the ladle cover castable.
Compared with the prior art, the invention has the following beneficial effects:
1. the ladle cover castable has the advantages that through the blending of all the components in the raw materials and the interaction among the components, the obtained ladle cover castable is high in strength, high in adhesion rate and long in service life, does not contain carbon, cannot fall off in use, cannot pollute molten steel even if fall off, is long in service life, low in maintenance workload, reduces the maintenance frequency of the ladle cover, saves the use amount of refractory materials, and is good in economic benefit.
2. In the ladle cover castable, waste high-alumina brick particles are obtained by crushing, removing impurities and screening off the off-line ladle or the iron-clad high-alumina brick residual bricks in the field and then recycling the crushed, purified and screened waste high-alumina brick particles. The flint clay has good thermal shock performance, so that the ladle cover castable has longer service life, and the flint clay has low cost, and can reduce the production cost of the ladle castable. The waste high-alumina brick particles and the flint clay are used as main raw materials, and the ladle cover castable has better mechanical strength through the mutual matching of the waste high-alumina brick particles and the flint clay. The green silicon carbide is a nonmetallic mineral product generated by taking quartz sand, petroleum coke and sodium chloride as basic raw materials at the high temperature of more than 1800 ℃, and has the characteristics of high hardness, small expansion coefficient, brittleness, good heat conductivity and the like;
3. according to the ladle cover castable, a certain mass part of flint clay fine powder with the particle size of 0.074-0.083mm, bauxite fine powder with the particle size of 0.074-0.083mm and green silicon carbide micro powder with the particle size of 0.044-0.074mm are added, so that the adhesion rate of the ladle cover castable is higher; by adding the steel fiber with the length of 25-30mm, the tensile strength, the compressive strength and the shear strength of the casting material can be greatly improved, the impact resistance of the casting material is improved, and the fatigue strength is improved.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The castable for the ladle cover in the embodiment is prepared from the following raw materials in parts by mass:
10 parts of waste high-alumina brick particles with the particle size of 8-20mm, 10 parts of waste high-alumina brick particles with the particle size of 5-8mm, 15 parts of waste high-alumina brick particles with the particle size of 3-5mm, 15 parts of waste high-alumina brick particles with the particle size of 1-3mm, 15 parts of flint clay with the particle size of 0.083-1mm, 5 parts of flint clay with the particle size of 0.074-0.083mm, 15 parts of bauxite with the particle size of 0.074-0.083mm, 5 parts of silicon micropowder with the particle size of 0.1-1 mu m, 5 parts of green silicon carbide micropowder with the particle size of 0.044-0.074mm, 7.55 parts of pure calcium aluminate cement, 1 part of steel fiber, 0.1 part of high molecular weight polyethylene fiber, 1 part of quartz sand, 0.096 part of sodium tripolyphosphate water reducer, 0.224 part of sodium hexametaphosphate and 0.03 part of retarder citric acid.
Al in the waste high-alumina brick particles2O3Is greater than 80 wt%; al in the flint clay2O3The content of (A) is more than 43wt%, and the content of Si is more than 51 wt%; al in the bauxite2O3Is greater than 75 wt%; the content of SiC in the green silicon carbide micro powder is more than 97 wt%; the length of the steel fiber is 25-30 mm.
The preparation method of the ladle cover castable in the embodiment comprises the following steps:
and mixing the preparation raw materials of the ladle cover castable, and then performing dry mixing for 3 minutes to obtain the ladle cover castable.
And adding 5.2wt% of water into the ladle cover castable, stirring for 5 minutes, vibrating by a vibrator (the amplitude is 0.5mm, the vibration frequency is 60 Hz) until the surface of the sample is uniformly turned, preparing a standard strip-shaped sample of 40mm multiplied by 160mm, naturally curing for 24 hours, and then demoulding.
Example 2
The castable for the ladle cover in the embodiment is prepared from the following raw materials in parts by mass:
10 parts of waste high-alumina brick particles with the particle size of 8-20mm, 15 parts of waste high-alumina brick particles with the particle size of 5-8mm, 10 parts of waste high-alumina brick particles with the particle size of 3-5mm, 10 parts of waste high-alumina brick particles with the particle size of 1-3mm, 20 parts of flint clay with the particle size of 0.083-1mm, 5 parts of flint clay with the particle size of 0.074-0.083mm, 15 parts of bauxite with the particle size of 0.074-0.083mm, 8 parts of silicon micropowder with the particle size of 0.1-1 mu m, 4 parts of green silicon carbide micropowder with the particle size of 0.044-0.074mm, 8.57 parts of pure calcium aluminate cement, 1 part of steel fiber, 0.1 part of high molecular weight polyethylene fiber, 1 part of quartz sand, 0.09 part of sodium tripolyphosphate water reducer, 0.21 part of water reducer sodium hexametaphosphate and 0.03 part of retarder citric acid.
Al in the waste high-alumina brick particles2O3Is greater than 80 wt%; al in the flint clay2O3The content of (A) is more than 43wt%, and the content of Si is more than 51 wt%; the aluminum alumAl in earth2O3Is greater than 75 wt%; the content of SiC in the green silicon carbide micro powder is more than 97 wt%; the length of the steel fiber is 25-30 mm.
The preparation method of the ladle cover castable in the embodiment comprises the following steps:
and mixing the preparation raw materials of the ladle cover castable, and then performing dry mixing for 3 minutes to obtain the ladle cover castable.
And adding 5.2wt% of water into the ladle cover castable, stirring for 5 minutes, vibrating by a vibrator (the amplitude is 0.5mm, the vibration frequency is 60 Hz) until the surface of the sample is uniformly turned, preparing a standard strip-shaped sample of 40mm multiplied by 160mm, naturally curing for 24 hours, and then demoulding.
Example 3
The castable for the ladle cover in the embodiment is prepared from the following raw materials in parts by mass:
15 parts of waste high-alumina brick particles with the particle size of 8-20mm, 5 parts of waste high-alumina brick particles with the particle size of 5-8mm, 15 parts of waste high-alumina brick particles with the particle size of 3-5mm, 15 parts of waste high-alumina brick particles with the particle size of 1-3mm, 15 parts of flint clay with the particle size of 0.083-1mm, 5 parts of flint clay with the particle size of 0.074-0.083mm, 15 parts of bauxite with the particle size of 0.074-0.083mm, 10 parts of silicon micropowder with the particle size of 0.1-1 mu m, 5 parts of green silicon carbide micropowder with the particle size of 0.044-0.074mm, 5.45 parts of pure calcium aluminate cement, 1 part of steel fiber, 0.1 part of high molecular weight polyethylene fiber, 3 parts of quartz sand, 0.12 part of sodium tripolyphosphate water reducer, 0.28 part of sodium hexametaphosphate and 0.05 part of retarder citric acid.
Al in the waste high-alumina brick particles2O3Is greater than 80 wt%; al in the flint clay2O3The content of (A) is more than 43wt%, and the content of Si is more than 51 wt%; al in the bauxite2O3Is greater than 75 wt%; the content of SiC in the green silicon carbide micro powder is more than 97 wt%; the length of the steel fiber is 25-30 mm.
The preparation method of the ladle cover castable in the embodiment comprises the following steps:
and mixing the preparation raw materials of the ladle cover castable, and then performing dry mixing for 3 minutes to obtain the ladle cover castable.
And adding 5.2wt% of water into the ladle cover castable, stirring for 5 minutes, vibrating by a vibrator (the amplitude is 0.5mm, the vibration frequency is 60 Hz) until the surface of the sample is uniformly turned, preparing a standard strip-shaped sample of 40mm multiplied by 160mm, naturally curing for 24 hours, and then demoulding.
Example 4
The castable for the ladle cover in the embodiment is prepared from the following raw materials in parts by mass:
10 parts of waste high-alumina brick particles with the particle size of 8-20mm, 15 parts of waste high-alumina brick particles with the particle size of 5-8mm, 10 parts of waste high-alumina brick particles with the particle size of 3-5mm, 15 parts of waste high-alumina brick particles with the particle size of 1-3mm, 15 parts of flint clay with the particle size of 0.083-1mm, 5 parts of flint clay with the particle size of 0.074-0.083mm, 15 parts of bauxite with the particle size of 0.074-0.083mm, 7 parts of silicon micropowder with the particle size of 0.1-1 mu m, 4 parts of green silicon carbide micropowder with the particle size of 0.044-0.074mm, 7.57 parts of pure calcium aluminate cement, 1 part of steel fiber, 0.1 part of high molecular weight polyethylene fiber, 2 parts of quartz sand, 0.09 part of sodium tripolyphosphate water reducer, 0.21 part of sodium hexametaphosphate and 0.03 part of retarder citric acid.
Al in the waste high-alumina brick particles2O3Is greater than 80 wt%; al in the flint clay2O3The content of (A) is more than 43wt%, and the content of Si is more than 51 wt%; al in the bauxite2O3Is greater than 75 wt%; the content of SiC in the green silicon carbide micro powder is more than 97 wt%; the length of the steel fiber is 25-30 mm.
The preparation method of the ladle cover castable in the embodiment comprises the following steps:
and mixing the preparation raw materials of the ladle cover castable, and then performing dry mixing for 3 minutes to obtain the ladle cover castable.
And adding 5.2wt% of water into the ladle cover castable, stirring for 5 minutes, vibrating by a vibrator (the amplitude is 0.5mm, the vibration frequency is 60 Hz) until the surface of the sample is uniformly turned, preparing a standard strip-shaped sample of 40mm multiplied by 160mm, naturally curing for 24 hours, and then demoulding.
Example 5
The castable for the ladle cover in the embodiment is prepared from the following raw materials in parts by mass:
15 parts of waste high-alumina brick particles with the particle size of 8-20mm, 15 parts of waste high-alumina brick particles with the particle size of 5-8mm, 15 parts of waste high-alumina brick particles with the particle size of 3-5mm, 15 parts of waste high-alumina brick particles with the particle size of 1-3mm, 10 parts of flint clay with the particle size of 0.083-1mm, 1 part of flint clay with the particle size of 0.074-0.083mm, 5 parts of bauxite with the particle size of 0.074-0.083mm, 5 parts of silicon micropowder with the particle size of 0.1-1 mu m, 10 parts of green silicon carbide micropowder with the particle size of 0.044-0.074mm, 5 parts of pure calcium aluminate cement, 5 parts of steel fibers, 0.05 part of high molecular weight polyethylene fibers, 10 parts of quartz sand, 0.03 part of sodium tripolyphosphate, 0.07 part of a water reducer, 0.07 part of sodium hexametaphosphate and 0.1 part of a retarder citric acid.
Al in the waste high-alumina brick particles2O3Is greater than 80 wt%; al in the flint clay2O3The content of (A) is more than 43wt%, and the content of Si is more than 51 wt%; al in the bauxite2O3Is greater than 75 wt%; the content of SiC in the green silicon carbide micro powder is more than 97 wt%; the length of the steel fiber is 25-30 mm.
The preparation method of the ladle cover castable in the embodiment comprises the following steps:
and mixing the preparation raw materials of the ladle cover castable, and then performing dry mixing for 3 minutes to obtain the ladle cover castable.
And adding 5.2wt% of water into the ladle cover castable, stirring for 5 minutes, vibrating by a vibrator (the amplitude is 0.5mm, the vibration frequency is 60 Hz) until the surface of the sample is uniformly turned, preparing a standard strip-shaped sample of 40mm multiplied by 160mm, naturally curing for 24 hours, and then demoulding.
Example 6
The castable for the ladle cover in the embodiment is prepared from the following raw materials in parts by mass:
10 parts of waste high-alumina brick particles with the particle size of 8-20mm, 5 parts of waste high-alumina brick particles with the particle size of 5-8mm, 10 parts of waste high-alumina brick particles with the particle size of 3-5mm, 10 parts of waste high-alumina brick particles with the particle size of 1-3mm, 20 parts of flint clay with the particle size of 0.083-1mm, 10 parts of flint clay with the particle size of 0.074-0.083mm, 10 parts of bauxite with the particle size of 0.074-0.083mm, 5 parts of silicon micropowder with the particle size of 0.1-1 mu m, 1 part of green silicon carbide micropowder with the particle size of 0.044-0.074mm, 10 parts of pure calcium aluminate cement, 3 parts of steel fibers, 0.15 part of high molecular weight polyethylene fibers, 5 parts of quartz sand, 0.15 part of sodium tripolyphosphate, 0.35 part of a water reducer, 0.01 part of a retarder and citric acid.
Al in the waste high-alumina brick particles2O3Is greater than 80 wt%; al in the flint clay2O3The content of (A) is more than 43wt%, and the content of Si is more than 51 wt%; al in the bauxite2O3Is greater than 75 wt%; the content of SiC in the green silicon carbide micro powder is more than 97 wt%; the length of the steel fiber is 25-30 mm.
The preparation method of the ladle cover castable in the embodiment comprises the following steps:
and mixing the preparation raw materials of the ladle cover castable, and then performing dry mixing for 3 minutes to obtain the ladle cover castable.
And adding 5.2wt% of water into the ladle cover castable, stirring for 5 minutes, vibrating by a vibrator (the amplitude is 0.5mm, the vibration frequency is 60 Hz) until the surface of the sample is uniformly turned, preparing a standard strip-shaped sample of 40mm multiplied by 160mm, naturally curing for 24 hours, and then demoulding.
Example 7
The castable for the ladle cover in the embodiment is prepared from the following raw materials in parts by mass:
5 parts of waste high-alumina brick particles with the particle size of 8-20mm, 5 parts of waste high-alumina brick particles with the particle size of 5-8mm, 5 parts of waste high-alumina brick particles with the particle size of 3-5mm, 5 parts of waste high-alumina brick particles with the particle size of 1-3mm, 20 parts of flint clay with the particle size of 0.083-1mm, 20 parts of flint clay with the particle size of 0.074-0.083mm, 1 part of bauxite with the particle size of 0.074-0.083mm, 1 part of silicon micropowder with the particle size of 0.1-1 mu m, 20 parts of green silicon carbide micropowder with the particle size of 0.044-0.074mm, 20 parts of pure calcium aluminate cement, 0.5 part of steel fiber, 0.02 part of high molecular weight polyethylene fiber, 0.5 part of quartz sand, 0.3 part of water reducer sodium tripolyphosphate, 0.7 part of water reducer sodium hexametaphosphate and 0.2 part of retarder citric acid.
Al in the waste high-alumina brick particles2O3Is greater than 80 wt%; al in the flint clay2O3The content of (A) is more than 43wt%, and the content of Si is more than 51 wt%; al in the bauxite2O3Is greater than 75 wt%; the content of SiC in the green silicon carbide micro powder is more than 97 wt%; the length of the steel fiber is 25-30 mm.
The preparation method of the ladle cover castable in the embodiment comprises the following steps:
and mixing the preparation raw materials of the ladle cover castable, and then performing dry mixing for 3 minutes to obtain the ladle cover castable.
And adding 5.2wt% of water into the ladle cover castable, stirring for 5 minutes, vibrating by a vibrator (the amplitude is 0.5mm, the vibration frequency is 60 Hz) until the surface of the sample is uniformly turned, preparing a standard strip-shaped sample of 40mm multiplied by 160mm, naturally curing for 24 hours, and then demoulding.
Example 8
The castable for the ladle cover in the embodiment is prepared from the following raw materials in parts by mass:
15 parts of waste high-alumina brick particles with the particle size of 8-20mm, 20 parts of waste high-alumina brick particles with the particle size of 5-8mm, 15 parts of waste high-alumina brick particles with the particle size of 3-5mm, 20 parts of waste high-alumina brick particles with the particle size of 1-3mm, 4 parts of flint clay with the particle size of 0.083-1mm, 1 part of flint clay with the particle size of 0.074-0.083mm, 30 parts of bauxite with the particle size of 0.074-0.083mm, 20 parts of silicon micropowder with the particle size of 0.1-1 mu m, 0.5 part of green silicon carbide micropowder with the particle size of 0.044-0.074mm, 1 part of pure calcium aluminate cement, 10 parts of steel fibers, 0.3 part of high molecular weight polyethylene fibers, 20 parts of quartz sand, 0.015 part of sodium tripolyphosphate, 0.035 part of water reducer sodium hexametaphosphate and 0.005 part of retarder citric acid.
Al in the waste high-alumina brick particles2O3Is greater than 80 wt%; al in the flint clay2O3The content of (A) is more than 43wt%, and the content of Si is more than 51 wt%; al in the bauxite2O3Is greater than 75 wt%; the content of SiC in the green silicon carbide micro powder is more than 97 wt%; the length of the steel fiber is 25-30 mm.
The preparation method of the ladle cover castable in the embodiment comprises the following steps:
and mixing the preparation raw materials of the ladle cover castable, and then performing dry mixing for 3 minutes to obtain the ladle cover castable.
And adding 5.2wt% of water into the ladle cover castable, stirring for 5 minutes, vibrating by a vibrator (the amplitude is 0.5mm, the vibration frequency is 60 Hz) until the surface of the sample is uniformly turned, preparing a standard strip-shaped sample of 40mm multiplied by 160mm, naturally curing for 24 hours, and then demoulding.
Example 9
The castable for the ladle cover in the embodiment is prepared from the following raw materials in parts by mass:
10 parts of waste high-alumina brick particles with the particle size of 8-20mm, 15 parts of waste high-alumina brick particles with the particle size of 5-8mm, 10 parts of waste high-alumina brick particles with the particle size of 3-5mm, 15 parts of waste high-alumina brick particles with the particle size of 1-3mm, 15 parts of flint clay with the particle size of 0.083-1mm, 5 parts of flint clay with the particle size of 0.074-0.083mm, 15 parts of bauxite with the particle size of 0.074-0.083mm, 7 parts of silicon micropowder with the particle size of 0.1-1 mu m, 4 parts of green silicon carbide micropowder with the particle size of 0.044-0.074mm, 7.57 parts of pure calcium aluminate cement, 1 part of steel fiber, 0.1 part of high molecular weight polyethylene fiber, 2 parts of quartz sand, 0.15 part of sodium tripolyphosphate water reducer, 0.15 part of sodium hexametaphosphate and 0.03 part of retarder citric acid.
The other components in the raw materials for preparing the ladle cover castable in the embodiment are the same as those in the embodiment 4, and the difference is only that the mass ratio of the sodium tripolyphosphate to the sodium hexametaphosphate in the water reducing agent is 1: 1.
The preparation method of the ladle cover castable in the embodiment comprises the following steps:
and mixing the preparation raw materials of the ladle cover castable, and then performing dry mixing for 3 minutes to obtain the ladle cover castable.
And adding 5.2wt% of water into the ladle cover castable, stirring for 5 minutes, vibrating by a vibrator (the amplitude is 0.5mm, the vibration frequency is 60 Hz) until the surface of the sample is uniformly turned, preparing a standard strip-shaped sample of 40mm multiplied by 160mm, naturally curing for 24 hours, and then demoulding.
Ladle cover castable performance test
The sample prepared from the ladle cover castable obtained in each embodiment is put into an oven to be dried for 24 hours at 110 ℃, and the standard strip sample is sintered at 1600 ℃ for 3 hours. The physical and chemical indexes of the obtained product are shown in the following table 1:
TABLE 1
Figure 543264DEST_PATH_IMAGE001
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. The castable for the ladle cover is characterized by comprising the following preparation raw materials in parts by mass:
20-70 parts of waste high-alumina brick particles, 5-40 parts of flint clay, 1-30 parts of bauxite, 1-20 parts of silicon micropowder, 0.5-20 parts of green silicon carbide micropowder, 1-20 parts of pure calcium aluminate cement, 0.5-10 parts of steel fibers, 0.02-0.3 part of organic fibers, 0.5-20 parts of quartz sand, 0.05-1 part of water reducing agent and 0.005-0.2 part of retarder.
2. The ladle cover castable according to claim 1, wherein the preparation raw materials comprise the following components in parts by weight:
35-60 parts of waste high-alumina brick particles, 11-30 parts of flint clay, 5-15 parts of bauxite, 5-10 parts of silicon micropowder, 1-10 parts of green silicon carbide micropowder, 5-10 parts of pure calcium aluminate cement, 1-5 parts of steel fiber, 0.05-0.15 part of organic fiber, 1-10 parts of quartz sand, 0.1-0.5 part of water reducing agent and 0.01-0.1 part of retarder.
3. The ladle cover castable according to claim 2, wherein the waste high-alumina brick particles comprise the following components in parts by mass:
10-15 parts of waste high-alumina brick particles with the particle size of 8-20mm, 5-15 parts of waste high-alumina brick particles with the particle size of 5-8mm, 10-15 parts of waste high-alumina brick particles with the particle size of 3-5mm and 10-15 parts of waste high-alumina brick particles with the particle size of 1-3 mm;
al in the waste high-alumina brick particles2O3The content of (A) is more than 80 wt%.
4. The ladle cover castable according to claim 2, wherein the flint clay comprises the following components in parts by mass:
10-20 parts of flint clay with the grain diameter of 0.083-1mm and 1-10 parts of flint clay with the grain diameter of 0.074-0.083 mm;
al in the flint clay2O3The content of (A) is more than 43wt%, and the content of Si is more than 51 wt%.
5. The ladle lid castable according to claim 2, wherein:
the particle size of the bauxite is 0.074-0.083 mm;
al in the bauxite2O3The content of (A) is more than 75 wt%.
6. The ladle lid castable according to claim 2, wherein:
the particle size of the green silicon carbide micro powder is 0.044-0.074 mm;
the content of SiC in the green silicon carbide micro powder is more than 97 wt%.
7. The ladle lid castable according to claim 2, wherein:
the length of the steel fiber is 25-30 mm;
the organic fiber is ultra-high molecular weight polyethylene fiber;
al in the pure calcium aluminate cement2O3The content of (B) is more than 70 wt%.
8. The ladle lid castable according to claim 2, wherein:
the water reducing agent is a mixture of sodium tripolyphosphate and sodium hexametaphosphate, and the mass ratio of the sodium tripolyphosphate to the sodium hexametaphosphate is 3: 7.
9. The ladle lid castable according to claim 2, wherein:
the retarder is citric acid.
10. A method of preparing a ladle castable material according to any one of claims 1 to 9, comprising the steps of:
and mixing the preparation raw materials of the ladle cover castable to obtain the ladle cover castable.
CN202110229698.4A 2021-03-02 2021-03-02 Ladle cover castable and preparation method thereof Pending CN112592193A (en)

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