CN111675546A - Thermal shock resistant high-alumina brick and preparation method thereof - Google Patents
Thermal shock resistant high-alumina brick and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
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- C—CHEMISTRY; METALLURGY
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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Abstract
The invention discloses a thermal shock resistant high-alumina brick which is prepared from the following raw materials, by weight, 20-30 parts of mullite particles with the mass percent of more than or equal to 70% and less than or equal to 90% of Al2O3 and less than or equal to 2% of Fe2O3, 40-60 parts of flint clay with the mass percent of more than or equal to 45% and less than or equal to 80% of Al2O3 and less than or equal to 1% of Fe2O3, 10-20 parts of high-alumina powder with the mass percent of more than or equal to 70% and less than or equal to 90% of Al2O3 and less than or equal to 2% of Fe2O3, 1-8 parts of light-burned magnesia powder, and 5-15 parts of white mud with the mass percent of more than or equal to 34%. The high-alumina brick has high thermal shock resistance and improves the refractoriness under load of the traditional high-alumina brick.
Description
Technical Field
The invention relates to a thermal shock resistant high-alumina brick and a preparation method thereof, belonging to the field of preparation of refractory materials.
Background
As is well known, the high-alumina brick is one of refractory materials, but the prior high-alumina brick has poor thermal shock stability and low refractoriness under load. Therefore, there is a need for improvement of the prior art to overcome the above technical problems.
Disclosure of Invention
In order to solve the technical problems, the invention provides a thermal shock resistant high-alumina brick, which is specifically realized by the following technical scheme:
the invention relates to a thermal shock resistant high-alumina brick which is prepared from the following raw materials, by weight, 20-30 parts of mullite particles with the mass percent of more than or equal to 70% and less than or equal to 90% of Al2O3 and less than or equal to 2% of Fe2O3, 40-60 parts of flint clay with the mass percent of more than or equal to 45% and less than or equal to 80% of Al2O3 and less than or equal to 1% of Fe2O3, 10-20 parts of high-alumina powder with the mass percent of more than or equal to 70% and less than or equal to 90% of Al2O3 and less than or equal to 2% of Fe2O3, 1-8 parts of light-burned magnesia powder, and 5-15 parts of white mud with the mass percent of more than or equal to 34.
The preferred scheme is as follows: the mullite grains are artificially synthesized, and the grain size is 3-5 mm.
The preferred scheme is as follows: the flint clay is formed by mixing 1-3mm of medium particles, 0-1mm of fine particles and 0.088mm of fine powder.
The preferred scheme is as follows: the light-burned magnesite powder is fine powder with the granularity of 0.08mm to 0.09.
A method for preparing a thermal shock resistant high-alumina brick mainly comprises the following process steps:
s1, mixing and stirring mullite, flint clay, water, flint clay, high-alumina powder and light-burned magnesia powder according to the proportion for 8-15 minutes;
s2: adding the white mud into S1, mixing and stirring for 8-15 minutes to form a blank for later use;
s3: the S2 blank is made into a blank with a fixed shape through a stamping die for later use;
s4: drying the blank in the S3 at 110-160 ℃ for 6-10h to prepare a semi-finished product for later use
S5: the semi-finished product in S4 is fired for 10-15h at the high temperature of 1400-1450 ℃.
The preferred scheme is as follows: and in the step S4, the drying temperature is 130 ℃, and the drying is carried out for 8 hours.
The preferred scheme is as follows: and in the step S5, the firing temperature is 1420 ℃, and the firing time is 12 hours.
The invention has the beneficial effects that:
1. the thermal shock resistant high-alumina brick produced by the preparation method can effectively improve the thermal shock stability times of the traditional high-alumina brick, and the performance refers to a chart 1.
2. The thermal shock resistant high-alumina brick produced by the preparation method can effectively improve the refractoriness under load of the traditional high-alumina brick, and the performance is referred to a chart 1.
3. Effectively reduces the variety of raw materials, has simple process, low cost and is convenient for mass production.
Other advantageous effects of the present invention will be further described with reference to the following specific examples.
Detailed Description
The invention relates to a thermal shock resistant high-alumina brick which is prepared from the following raw materials, by weight, 20-30 parts of mullite particles with the mass percent of more than or equal to 70% and less than or equal to 90% of Al2O3 and less than or equal to 2% of Fe2O3, 40-60 parts of flint clay with the mass percent of more than or equal to 45% and less than or equal to 80% of Al2O3 and less than or equal to 1% of Fe2O3, 10-20 parts of high-alumina powder with the mass percent of more than or equal to 70% and less than or equal to 90% of Al2O3 and less than or equal to 2% of Fe2O3, 1-8 parts of light-burned magnesia powder, and 5-15 parts of white mud with the mass percent of more than or equal to 34. Preferentially, the mullite grains are artificially synthesized, and the grain size is 3-5 mm; the light-burned magnesite powder is fine powder with the granularity of 0.08mm to 0.09. Further, the present invention controls the range of Al2O3, thus preserving the chemical properties of the high alumina brick. The limitation of the range of Fe2O3 can effectively reduce the damage of Fe2O3 to the physical properties of the high-alumina brick and reduce the karst cave and iron spots on the surface of the brick. Furthermore, the invention is suitable for mullite, flint clay and light-burned magnesia powder, the mullite has excellent thermal shock resistance, the flint clay can effectively reduce the porosity of the brick and improve the thermal shock performance, the light-burned magnesia powder can improve the thermal shock stability of the high-alumina brick, and the white mud plays a role in bonding.
Preferably, the flint clay is formed by mixing 1-3mm of medium particles, 0-1mm of fine particles and 0.088mm of fine powder, and the mixing ratio is 3:1.5 (2.5-3). The sample setting has the effects that the large particles with the granularity can effectively improve the pressure resistance and the thermal shock, and the powder can be fully filled among the particles, so that the particles and the powder can be fully combined, and the porosity is effectively reduced.
The specific examples of the scheme and the properties of the products prepared by the examples are as follows:
example 1
The fired thermal shock resistant high-alumina brick comprises, by weight, 20 parts of mullite particles, 47 parts of flint clay, 20 parts of high-alumina powder, 3 parts of light-burned magnesia powder and 10 parts of Guangxi white mud. Preferably, the mullite grains are artificially synthesized, and the grain size of the mullite grains is 4 mm; the flint clay is formed by mixing medium particles with the particle size of 2mm, fine particles with the particle size of 0.5mm and fine powder with the particle size of 0.088 mm.
Example 2
The fired thermal shock resistant high-alumina brick comprises, by weight, 25 parts of mullite particles, 42 parts of flint clay, 18 parts of high-alumina powder, 5 parts of light-burned magnesia powder and 10 parts of Guangxi white mud. 10 parts of mullite particles, 73 parts of flint clay, 4 parts of light-burned magnesia powder and 13 parts of Guangxi white mud. The mullite grains are artificially synthesized, and the grain size of the mullite grains is 4 mm; the flint clay is formed by mixing medium particles with the particle size of 2mm, fine particles with the particle size of 0.5mm and fine powder with the particle size of 0.088 mm.
Example 3
The fired thermal shock resistant high-alumina brick comprises, by weight, 30 parts of mullite particles, 36 parts of flint clay, 15 parts of high-alumina powder, 6 parts of light-burned magnesia powder and 13 parts of Guangxi white mud. The mullite grains are artificially synthesized, and the grain size of the mullite grains is 4 mm; the flint clay is formed by mixing medium particles with the particle size of 2mm, fine particles with the particle size of 0.5mm and fine powder with the particle size of 0.088 mm.
The performance parameters of the high-alumina bricks according to the invention obtained in the above examples 1 to 3 are shown in Table 1:
(Table 1 comparison of firing thermal shock resistance and general performance index of high alumina brick)
Any of the above examples 1-3 can be prepared by:
the method for preparing the thermal shock resistant high-alumina brick mainly comprises the following process steps:
s1, mixing and stirring mullite, flint clay, water, flint clay, light-burned magnesia powder and high-alumina powder in proportion for 8-15 minutes;
s2: adding the white mud into S1, mixing and stirring for 8-15 minutes to form a blank for later use;
s3: the S2 blank is made into a blank with a fixed shape through a stamping die for later use;
s4: drying the blank in the S3 at 110-160 ℃ for 6-10h to prepare a semi-finished product for later use
S5: and firing the semi-finished product in S4 at the high temperature of 1400 ℃ and 1500 ℃ for 10-15 h.
Through long-term research, the inventor finds that the cracks of the high-alumina brick obtained by continuously baking the blank at the baking temperature of 130 ℃ for 8h and then continuously baking the blank are obviously reduced, the apparent porosity of the high-alumina brick obtained by continuously baking the blank at the baking temperature of 1420 ℃ is about 18%, the thermal shock stability is about 1100 ℃, water cooling is carried out for about 60 times, and the refractoriness under load is 1480 ℃ at the initial temperature of 0.2MPa, so that the comprehensive performance of the high-alumina brick is obviously improved. Furthermore, by adopting the drying temperature and time, the moisture in the semi-finished brick blank can be fully dried and removed, the finished product cracks are reduced in the firing process, so that the porosity and refractoriness under load of the finished brick are reduced, the firing temperature and time are selected, the high-temperature performance of the brick of the finished brick can be ensured, the raw material aggregate and the powder are fully combined, if the firing temperature and time are reduced, the raw material cannot be thoroughly combined, the porosity of the brick cannot be effectively ensured, and if the firing temperature and time are increased, the thermal shock resistance stability of the brick can be greatly damaged.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. A thermal shock resistant high-alumina brick is characterized in that: is prepared from Al (70-70 wt.%) and optional additive2O3Less than or equal to 90 percent and Fe2O320-30 parts of mullite particles with the concentration of less than or equal to 2 percent, 40-60 parts of flint clay with the concentration of less than or equal to 45 percent and less than or equal to 80 percent of Al2O3 and less than or equal to 1 percent of Fe2O3, 10-20 parts of high-alumina powder with the concentration of less than or equal to 70 percent and less than or equal to 90 percent of Al2O3 and less than or equal to 2 percent of Fe2O3, 1-8 parts of light-burned magnesia powder and 5-15 parts of white mud with the concentration of less than or equal to 34 percent and less than or equal to 60 percent of Al2O3 and less than.
2. The thermal shock resistant high alumina brick according to claim 1, characterized in that: the mullite grains are artificially synthesized, and the grain size is 3-5 mm.
3. The thermal shock resistant high alumina brick according to claim 1, characterized in that: the flint clay is formed by mixing 1-3mm of medium particles, 0-1mm of fine particles and 0.088mm of fine powder, and the mixing ratio is 3:1.5 (2.5-3).
4. The thermal shock resistant high alumina brick according to claim 1, characterized in that: the light-burned magnesite powder is fine powder with the granularity of 0.08mm to 0.09.
5. A method for preparing the thermal shock resistant high alumina brick of any one of claims 1 to 4, which is characterized by comprising the following steps: the method mainly comprises the following process steps:
s1, mixing and stirring mullite, flint clay, water, flint clay, high-alumina powder and light-burned magnesia powder according to the proportion,
stirring for 8-15 min;
s2: adding the white mud into S1, mixing and stirring for 8-15 minutes to form a blank for later use;
s3: the S2 blank is made into a blank with a fixed shape through a stamping die for later use;
s4: drying the blank in the S3 at 110-160 ℃ for 6-10h to prepare a semi-finished product for later use
S5: the semi-finished product in S4 is fired for 10-15h at the high temperature of 1400-1450 ℃.
6. The method for preparing the thermal shock resistant high alumina brick as claimed in claim 5, wherein: and in the step S4, the drying temperature is 130 ℃, and the drying is carried out for 8 hours.
7. The method for preparing the thermal shock resistant high alumina brick according to claim 6, wherein: and in the step S5, the firing temperature is 1420 ℃, and the firing time is 12 hours.
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Application publication date: 20200918 |