CN116102337A - Hydration-resistant magnesia spinel brick and preparation method thereof - Google Patents
Hydration-resistant magnesia spinel brick and preparation method thereof Download PDFInfo
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- CN116102337A CN116102337A CN202310392782.7A CN202310392782A CN116102337A CN 116102337 A CN116102337 A CN 116102337A CN 202310392782 A CN202310392782 A CN 202310392782A CN 116102337 A CN116102337 A CN 116102337A
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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
- C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
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- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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Abstract
The invention provides an anti-hydration magnesium spinel brick and a preparation method thereof, wherein the preparation raw materials of the anti-hydration magnesium spinel brick comprise the following components in percentage by mass: 60-90% of fused magnesia, 5-20% of magnesia-alumina spinel, 0.5-5% of alumina micropowder, 1-12% of passivated metal aluminum powder and 0.08-3% of magnesium aluminum alloy powder; the total of the components is 100%; the adhesive also comprises 1-5% of the total mass of the components. The magnesia spinel brick has good hydration resistance and powder resistance and good volume stability; the preparation method has the advantages that the stability and the volume density of the brick blank of the magnesium spinel brick are improved by adopting a large-tonnage press molding mode under a negative pressure environment, the diffusion resistance of water vapor in the magnesium spinel brick is increased, and the hydration and the pulverization of the magnesium spinel brick in the baking and using processes can be further reduced.
Description
Technical Field
The invention belongs to the technical field of refractory materials for steelmaking, and particularly relates to a hydration-resistant magnesia-spinel brick and a preparation method thereof.
Background
RH system equipment is molten steel secondary refining process equipment for producing high-quality steel. The whole molten steel metallurgical reaction is carried out in a vacuum tank built with a refractory lining. The lower part of the vacuum tank is provided with two dipping pipes with refractory lining, and the upper part is provided with a hot bent pipe. Before molten steel treatment, the dipping pipe is immersed into the molten steel of the ladle to be treated. When the vacuum tank is vacuumized, the atmospheric pressure on the surface of molten steel forces molten steel to flow into the vacuum tank from the dipping pipes, and two dipping pipes communicated with the vacuum tank are arranged, wherein one dipping pipe is an ascending pipe, and the other dipping pipe is a descending pipe. Because the ascending pipe continuously blows argon into the molten steel through the argon pipe, a higher static pressure difference is generated relative to the descending pipe without argon blowing, so that the molten steel enters from the ascending pipe and flows to the descending pipe through the bottom of the vacuum tank, and the continuous circulation is repeated. In the vacuum state, argon, hydrogen, carbon monoxide and other gases in the molten steel flowing through the vacuum tank are pumped out in the molten steel circulation process. Meanwhile, the molten steel entering the vacuum tank also carries out a series of metallurgical reactions, such as carbon-oxygen reaction and the like, and the molten steel is purified by cyclic degassing and refining.
The interior of the vacuum tank is protected by refractory materials by masonry, a magnesia spinel brick or a magnesia chrome brick is a working layer, and is directly contacted with molten steel, so that the magnesia spinel brick or the magnesia chrome brick is an important component of the whole vacuum system, and directly influences the service life of the whole RH refining system.
In the prior art, a preparation method of a magnesium spinel brick has been reported, for example, the invention with the authority publication number of CN104016691A discloses a magnesium spinel brick for an RH vacuum refining furnace and a preparation method thereof, wherein the magnesium spinel brick comprises the following components in percentage by weight: 80% -90% of MgO; al (Al) 2 O 3 6% -10%; c1-5%; other 0% -5%. The preparation method comprises the following steps: mixing the raw materials of the magnesia spinel brick, and performing compression molding and drying to obtain the magnesia spinel brick; the magnesium spinel brick comprises the following raw materials in parts by weight: magnesia alumina spinel A75-85; 10-15 parts of magnesia-alumina spinel B; 2.5-3 parts of phenolic resin; 0-3 parts of graphite; 3-4 parts of aluminum magnesium alloy powder. The preparation method is simple to operate, the sintering process is omitted, and the prepared magnesium spinel brick does not contain chromium and has little environmental pollution.
However, the magnesia-spinel brick prepared by the method mainly comprises magnesia-alumina spinel, a proper amount of graphite and aluminum-magnesium alloy powder are added, and the magnesia-spinel brick is prepared by pressing and baking, so that a large amount of in-situ spinel is generated by the reaction of metal aluminum in the magnesia-spinel brick and periclase in a high-temperature environment, the magnesia-spinel brick is expanded at high temperature, cracks are easy to generate, the densification of the material is not facilitated, and the high-temperature service performance of the material is reduced; and part of aluminum nitride generated at the same time reacts with water in the air to generate aluminum hydroxide and ammonia gas, so that the performance of the magnesium spinel brick is reduced, and even the magnesium spinel brick is pulverized to lose strength.
Disclosure of Invention
The invention solves the technical problem of providing a hydration-resistant magnesia-spinel brick and a preparation method thereof, wherein the magnesia-spinel brick has good hydration resistance, good chalk resistance and good volume stability; the preparation method has the advantages that the stability and the volume density of the brick blank of the magnesium spinel brick are improved by adopting a large-tonnage press molding mode under a negative pressure environment, the diffusion resistance of water vapor in the magnesium spinel brick is increased, and the hydration and the pulverization of the magnesium spinel brick in the baking and using processes can be further reduced.
In order to solve the problems, a first aspect of the invention provides a hydration-resistant magnesium spinel brick, which is prepared from the following raw materials in percentage by mass:
60-90% of fused magnesia, 5-20% of magnesia-alumina spinel, 0.5-5% of alumina micropowder, 1-12% of passivated metal aluminum powder and 0.08-3% of magnesium aluminum alloy powder; the total of the components is 100%;
the adhesive also comprises 1-5% of the total mass of the components.
Preferably, the preparation raw materials of the hydration-resistant magnesia spinel brick comprise the following components in percentage by mass:
77-82% of electric smelting magnesia, 10-15% of magnesia-alumina spinel, 1-3% of alumina micropowder, 3-8% of passivated metal aluminum powder and 0.1-2% of magnesium aluminum alloy powder; the total of the components is 100%;
the adhesive also comprises 2.5% -3% of the total mass of the components.
Preferably, the Al content in the passivated metal aluminum powder is more than or equal to 98%, and the granularity of the passivated metal aluminum powder is 180-325 meshes.
Preferably, in the magnesium-aluminum alloy powder, magnesium: the mass ratio of aluminum is 1: (0.8-1.2); the granularity of the magnesium-aluminum alloy powder is 150-200 meshes.
Preferably, in the fused magnesia, the MgO content is more than or equal to 98.0wt percent, the CaO content is less than or equal to 1.0wt percent, and the SiO content is less than or equal to 1.0wt percent 2 The content is less than or equal to 0.8wt%; the grain size of the fused magnesia is more than or equal to 600 mu m, and the volume density of the grains of the fused magnesia is more than or equal to 3.40g/cm 3 。
Preferably, the fused magnesia comprises particles with the granularity of 5-3mm, particles with the granularity of 3-1mm, particles with the granularity of 1-0.5mm, particles with the granularity of 0.5-0mm and fine powder with the granularity of 200-320 meshes;
particles having a particle size of 5-3 mm: particles having a particle size of 3-1 mm: particles having a particle size of 1-0.5 mm: particles having a particle size of 0.5-0 mm: the mass ratio of the 200-320 mesh fine powder is 16-22:28-34:16-20:0-5:8-18.
Preferably, the magnesia-alumina spinel is one or the combination of two of fused magnesia-alumina spinel and sintered magnesia-alumina spinel; in the magnesia-alumina spinel, al 2 O 3 The content is 72-78-wt%, the MgO content is 20-28%, siO 2 The content is less than or equal to 0.5wt percent, and the FeO content is less than or equal to 0.5wt percent; the granularity of the magnesia-alumina spinel is 200-325 meshes.
The second aspect of the invention provides a preparation method of the hydration-resistant magnesia-spinel brick, which comprises the following steps:
and (3) mixing the fused magnesia, the magnesia spinel, the alumina micropowder, the passivated metal aluminum powder, the magnesium aluminum alloy powder and the bonding agent, then forming the mixed raw materials on a large-tonnage brick press under a negative pressure environment, and then baking and dehydrating to obtain the hydration-resistant magnesia spinel brick.
Preferably, the step of mixing the fused magnesia, the magnesia spinel, the alumina micropowder, the passivated metal aluminum powder, the magnesium aluminum alloy powder and the bonding agent specifically comprises the following steps of:
firstly, premixing fused magnesia particles with the granularity of 5-3mm, fused magnesia particles with the granularity of 3-1mm, fused magnesia particles with the granularity of 1-0.5mm and fused magnesia particles with the granularity of 0.5-0mm for 2-3min, adding a bonding agent for mixing for 3-5min, adding fused magnesia fine powder with the granularity of 200-320 meshes, magnesia spinel, alumina micropowder, passivated metal aluminum powder and magnesium aluminum alloy powder, and continuously mixing for 10-15min.
Preferably, the baking temperature is 200-240 ℃ and the baking time is 40-45h.
Compared with the prior art, the invention has the following beneficial effects:
the hydration-resistant magnesia spinel brick is mainly prepared from an electrofused magnesia material, and is characterized in that passivated metal aluminum powder is introduced, and the surface layer of the metal aluminum powder is wrapped by a layer of uniform passivation film with stronger protection performance, so that aluminum powder is prevented from forming aluminum nitride under the ammonia or nitrogen atmosphere in the use process, and aluminum nitride and air cannot occurThe water in the gas reacts to generate aluminum hydroxide and ammonia gas, so that the hydration of the magnesia-spinel brick is prevented; meanwhile, the aluminum oxide can be completely generated in the high-temperature process of the metal aluminum powder, and further the aluminum oxide reacts with magnesia to generate high Wen Xiangmei aluminum spinel, so that the performance and the strength of the magnesia spinel brick are ensured. Under the condition of the same aluminum content, compared with the metal aluminum powder, the oxidation resistance of the magnesia spinel brick is reduced by adding the passivated metal aluminum powder, and the invention further adds a small amount of the magnesium aluminum alloy powder which can react with the magnesium oxide in the fused magnesia to generate high Wen Xiangmei aluminum spinel on one hand, so that the magnesia spinel brick has excellent slag penetration resistance and erosion resistance; on the other hand, because the magnesium aluminum alloy is preferentially oxidized than C (bonding agent), compact Al can be formed around MgO particles at the steelmaking temperature due to the diffusion oxidation of Al and Mg and the spinel petrochemical reaction with magnesia 2 O 3、 The magnesium aluminum spinel and other protective layers have an anti-oxidation effect, and meanwhile, the magnesium aluminum alloy powder additive amount is strictly regulated and controlled to prevent expansion. The magnesia spinel brick has good hydration resistance and powder resistance and good volume stability; and the chemical composition is reasonable, the high-temperature products are controlled, and no harmful products are generated, such as Cr which is harmful to the environment +6 。
According to the preparation method of the hydration-resistant magnesia-spinel brick, a large-tonnage press forming mode is adopted under a negative pressure environment, and the vibration blanking and four-side uniform material pulling forming mode is utilized, so that the stability and the volume density of a brick blank of the magnesia-spinel brick are improved, the resistance of diffusion of water vapor in the interior of the magnesia-spinel brick is increased, and the hydration and the pulverization of the magnesia-spinel brick in the baking and using processes can be further reduced.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
At present, the existing magnesia-spinel brick mainly comprises magnesia-alumina spinel, and is formed by adding a proper amount of graphite and aluminum-magnesium alloy powder and baking, however, a large amount of in-situ spinel is generated by the reaction of metal aluminum in the magnesia-spinel brick and periclase in a high-temperature environment, so that the magnesia-spinel brick is expanded at high temperature, cracks are easy to generate, the densification of the material is not facilitated, and the high-temperature service performance of the material is reduced; meanwhile, aluminum powder can form aluminum nitride at 800-1000 ℃ in ammonia or nitrogen atmosphere, and part of generated aluminum nitride reacts with water in air to generate aluminum hydroxide and ammonia gas, so that the performance of the magnesium spinel brick is reduced, and even the magnesium spinel brick is pulverized to lose strength.
In order to solve the above problems, a first aspect of the embodiments of the present invention provides a hydration-resistant magnesia-spinel brick, wherein the raw materials for preparing the hydration-resistant magnesia-spinel brick include the following components in percentage by mass:
60-90% of fused magnesia, 5-20% of magnesia-alumina spinel, 0.5-5% of alumina micropowder, 1-12% of passivated metal aluminum powder and 0.08-3% of magnesium aluminum alloy powder; the total of the components is 100%;
the adhesive also comprises 1-5% of the total mass of the components.
Wherein, the passivated metal aluminum powder is an oxide film formed on the surface of the aluminum powder, and the passivated metal aluminum powder is a commercial product and can be directly purchased.
According to the hydration-resistant magnesia spinel brick disclosed by the embodiment of the invention, the raw material is mainly an electrofused magnesia material, the passivated metal aluminum powder is introduced, the passivated metal aluminum powder has the function of completely generating alumina under a high-temperature condition and further reacts with magnesia to generate high Wen Xiangmei alumina spinel so as to ensure the performance and strength of the magnesia spinel brick, and after the passivated metal aluminum powder is adopted, the surface layer of the metal aluminum powder is wrapped by a uniform passivation film with stronger protective performance, so that aluminum nitride is prevented from being generated under the ammonia or nitrogen atmosphere in the use process, the condition that aluminum nitride reacts with water in the air to generate aluminum hydroxide and ammonia gas is avoided, the hydration of the magnesia spinel brick is prevented, and the performance and strength of the magnesia spinel brick are ensured. On the other hand, the addition of the passivated metal aluminum powder reduces the oxidation resistance of the magnesia-spinel brick compared with the metal aluminum powder, and therefore, the invention proceeds toA small amount of magnesium-aluminum alloy powder is added in one step, and the magnesium-aluminum alloy powder can react with magnesium oxide in the fused magnesia to generate high Wen Xiangmei aluminum spinel, so that the high Wen Xiangmei aluminum spinel has excellent slag penetration resistance and erosion resistance; on the other hand, because the magnesium aluminum alloy is preferentially oxidized than C (bonding agent), compact Al can be formed around MgO particles at the steelmaking temperature due to the diffusion oxidation of Al and Mg and the spinel petrochemical reaction with magnesia 2 O 3、 The magnesium aluminum spinel and other protective layers have an anti-oxidation effect, and the addition amount of magnesium aluminum alloy powder is further strictly regulated and controlled to prevent volume expansion. The magnesia spinel brick has good hydration resistance and powder resistance and good volume stability; and the chemical composition is reasonable, the high-temperature products are controlled, and no harmful products are generated, such as Cr which is harmful to the environment +6 。
In some embodiments, the preparation raw materials of the hydration-resistant magnesia spinel brick comprise the following components in percentage by mass:
77-82% of electric smelting magnesia, 10-15% of magnesia-alumina spinel, 1-3% of alumina micropowder, 3-8% of passivated metal aluminum powder and 0.1-2% of magnesium aluminum alloy powder; the total of the components is 100%;
the adhesive also comprises 2.5% -3% of the total mass of the components.
According to the hydration-resistant magnesia-spinel brick disclosed by the embodiment of the invention, the mass percentages of the components are further optimized, and experimental researches show that when the percentage ranges are adopted, the obtained magnesia-spinel brick has better hydration resistance, oxidation resistance, strength and other comprehensive properties.
In some embodiments, the content of Al in the passivated metal aluminum powder is more than or equal to 98 percent, and the particle size of the passivated metal aluminum powder is 180-325 meshes. When the content of Al in the passivated aluminum powder is lower than the content standard, low melting point substances such as Fe may be introduced into the passivated aluminum powder 2 O 3 、K 2 O、Na 2 Excessive O, the impurities can cause the high-temperature slag erosion resistance of the magnesia spinel brick to be reduced.
In some embodiments, in the magnesium aluminum alloy powder, magnesium: the mass ratio of aluminum is 1: (0.8-1.2); the granularity of the magnesium aluminum alloy powder is 150-200 meshes. The proper magnesium-aluminum ratio can enhance the oxidation resistance and the high-temperature strength of the magnesia spinel brick.
In some embodiments, the fused magnesia has MgO content of 98.0wt% or more and CaO content of 1.0wt% or less, siO 2 The content is less than or equal to 0.8wt%; the grain size of the fused magnesia is more than or equal to 600 mu m, and the volume density of the grains of the fused magnesia is more than or equal to 3.40g/cm 3 。
In some embodiments, the fused magnesia comprises particles having a particle size of 5-3mm, particles having a particle size of 3-1mm, particles having a particle size of 1-0.5mm, particles having a particle size of 0.5-0mm, and 200-320 mesh fines; particles having a particle size of 5-3 mm: particles having a particle size of 3-1 mm: particles having a particle size of 1-0.5 mm: particles having a particle size of 0.5-0 mm: the mass ratio of 200-320 meshes of fine powder is 16-22:28-34:16-20:0-5:8-18. By adopting the grain size grading of the fused magnesia and matching with other raw materials, the grains accord with the optimal close packing, can well fill the gaps of the grains, and simultaneously reduces the water absorption rate in the storage process, thereby obviously improving the service performance of the magnesia spinel brick.
The magnesia-alumina spinel has excellent volume stability at high temperature and raised heat shock stability. In some embodiments, the magnesia-alumina spinel is one or a combination of two of an electrically fused magnesia-alumina spinel, a sintered magnesia-alumina spinel; in the magnesia-alumina spinel, al 2 O 3 The content is 72-78-wt%, the MgO content is 20-28%, siO 2 The content is less than or equal to 0.5wt percent, and the FeO content is less than or equal to 0.5wt percent; the granularity of the magnesia-alumina spinel is 200-325 meshes.
The alumina micropowder is used for further reacting with fused magnesia to generate magnesia-alumina spinel. In some embodiments, the alumina micropowder has a particle size of 1-3 μm.
In some embodiments, the additional binder may be an organic binder or an inorganic binder, for example, may be one or a combination of several of resin, magnesium aluminum sol, pulp waste, phosphoric acid, and phosphate.
The second aspect of the invention provides a preparation method of the hydration-resistant magnesia-spinel brick, which comprises the following steps:
and (3) mixing the fused magnesia, the magnesia spinel, the alumina micropowder, the passivated metal aluminum powder, the magnesium aluminum alloy powder and the bonding agent, then forming the mixed raw materials on a large-tonnage brick press under a negative pressure environment, and then baking and dehydrating to obtain the hydration-resistant magnesia spinel brick.
According to the preparation method of the hydration-resistant magnesia-spinel brick, a large-tonnage press forming mode is adopted under a negative pressure environment, and the vibration blanking and four-side uniform material pulling forming mode is utilized, so that the stability and the volume density of a brick blank of the magnesia-spinel brick are improved, the resistance of diffusion of water vapor in the interior of the magnesia-spinel brick is increased, and the hydration and the pulverization of the magnesia-spinel brick in the baking and using processes can be further reduced.
In some embodiments, the steps of mixing the fused magnesia, the magnesia-alumina spinel, the alumina micropowder, the passivated metal aluminum powder, the magnesium aluminum alloy powder and the binding agent are specifically as follows:
firstly, premixing fused magnesia particles with the granularity of 5-3mm, fused magnesia particles with the granularity of 3-1mm, fused magnesia particles with the granularity of 1-0.5mm and fused magnesia particles with the granularity of 0.5-0mm for 2-3min, adding a bonding agent for mixing for 3-5min, adding fused magnesia fine powder with the granularity of 200-320 meshes, magnesia spinel, alumina micropowder, passivated metal aluminum powder and magnesium aluminum alloy powder, and continuously mixing for 10-15min.
In some embodiments, the baking temperature is 200-240 ℃ and the baking time is 40-45 hours.
In the following examples, passivated metal aluminum powder is purchased from inner Mongolian Xueyang new materials Co., ltd, and the Al content in the passivated metal aluminum powder is more than or equal to 98%; in the fused magnesia, the MgO content is more than or equal to 98.0wt percent, the CaO content is less than or equal to 1.0wt percent, and the SiO content is less than or equal to 1.0wt percent 2 The content is less than or equal to 0.8wt%; the grain size of the fused magnesite is more than or equal to 600 mu m, and the volume density of the grains of the fused magnesite is more than or equal to 3.40g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the In magnesia-alumina spinel, al 2 O 3 The content is 72-78-wt%, the MgO content is 20-28%, siO 2 The content is less than or equal to 0.5wt percent, and the FeO content is less than or equal to 0.5wt percent; the granularity of the alumina micropowder is 1-3 mu m; the granularity of the magnesium-aluminum alloy powder is 150-200 meshes.
Example 1
The hydration-resistant magnesia-spinel brick of the embodiment comprises the following raw materials in percentage by mass:
16 parts of fused magnesia particles with the granularity of 5-3mm, 32 parts of fused magnesia particles with the granularity of 3-1mm, 18 parts of fused magnesia particles with the granularity of 1-0.5mm, 4 parts of fused magnesia particles with the granularity of 0.5-0mm, 12 parts of 200-mesh fused magnesia fine powder, 10 parts of 200-mesh magnesia spinel, 3 parts of alumina micropowder, 3 parts of 180-mesh passivated metal aluminum powder and 2 parts of magnesium aluminum alloy powder; 2.7 parts of bonding agent phenolic resin is added. Magnesium in the magnesium aluminum alloy powder: the mass ratio of aluminum is 1:1.
the preparation method of the hydration-resistant magnesia-spinel brick comprises the following steps:
1. premixing fused magnesia particles with the aggregate part granularity of 5-3mm, fused magnesia particles with the granularity of 3-1mm, fused magnesia particles with the granularity of 1-0.5mm and fused magnesia particles with the granularity of 0.5-0mm for 2-3min, adding a bonding agent, continuously mixing for 3-5min, adding 200-mesh fused magnesia fine powder, magnesia spinel, alumina micropowder, passivated metal aluminum powder and magnesium aluminum alloy powder after uniform mixing, and continuously mixing for 10-15min until the raw materials are fully and uniformly mixed;
2. adding the mixed raw materials into a mould, and forming on a 1000-tonnage brick press under a negative pressure environment;
3. and (3) baking and dehydrating the molded sample in a drying kiln at 220 ℃ for 42 hours to obtain the hydration-resistant magnesia spinel brick.
Example 2
The hydration-resistant magnesia-spinel brick of the embodiment comprises the following raw materials in percentage by mass:
18 parts of fused magnesia particles with the granularity of 5-3mm, 29 parts of fused magnesia particles with the granularity of 3-1mm, 16 parts of fused magnesia particles with the granularity of 1-0.5mm, 4 parts of fused magnesia particles with the granularity of 0.5-0mm, 12 parts of 200-mesh fused magnesia fine powder, 10 parts of 200-mesh magnesia spinel, 3 parts of alumina micropowder, 6 parts of 180-mesh passivated metal aluminum powder and 2 parts of magnesium aluminum alloy powder; 2.5 parts of bonding agent phenolic resin is added. Magnesium in the magnesium aluminum alloy powder: the mass ratio of aluminum is 1:1.
the preparation method of the hydration-resistant magnesia-spinel brick of this example is the same as that of example 1.
Example 3
The hydration-resistant magnesia-spinel brick of the embodiment comprises the following raw materials in percentage by mass:
22 parts of fused magnesia particles with the granularity of 5-3mm, 28 parts of fused magnesia particles with the granularity of 3-1mm, 16 parts of fused magnesia particles with the granularity of 1-0.5mm, 3 parts of fused magnesia particles with the granularity of 0.5-0mm, 8 parts of fused magnesia fine powder with the granularity of 200 meshes, 15 parts of magnesia spinel with the granularity of 200 meshes, 1 part of alumina micropowder, 6.5 parts of passivated metal aluminum powder with the granularity of 180 meshes and 0.5 part of magnesium aluminum alloy powder; 3.0 parts of magnesium aluminum sol as an external bonding agent. Magnesium in the magnesium aluminum alloy powder: the mass ratio of aluminum is 1:1.
the preparation method of the hydration-resistant magnesia-spinel brick of this example is the same as that of example 1.
Example 4
The hydration-resistant magnesia-spinel brick of the embodiment comprises the following raw materials in percentage by mass:
15 parts of fused magnesia particles with the granularity of 5-3mm, 24 parts of fused magnesia particles with the granularity of 3-1mm, 12 parts of fused magnesia particles with the granularity of 1-0.5mm, 4 parts of fused magnesia particles with the granularity of 0.5-0mm, 20 parts of 200-mesh fused magnesia fine powder, 8 parts of 200-mesh magnesia spinel, 5 parts of alumina micropowder, 9 parts of 180-mesh passivated metal aluminum powder and 3 parts of magnesium aluminum alloy powder; 1.0 part of magnesium aluminum sol as an external bonding agent. Magnesium in the magnesium aluminum alloy powder: the mass ratio of aluminum is 1:1.
the preparation method of the hydration-resistant magnesia-spinel brick of this example is the same as that of example 1.
Example 5
The hydration-resistant magnesia-spinel brick of the embodiment comprises the following raw materials in percentage by mass:
18 parts of fused magnesia particles with the granularity of 5-3mm, 36 parts of fused magnesia particles with the granularity of 3-1mm, 18 parts of fused magnesia particles with the granularity of 1-0.5mm, 6 parts of fused magnesia particles with the granularity of 0.5-0mm, 12 parts of 200-mesh fused magnesia fine powder, 5 parts of 200-mesh magnesia spinel, 3.5 parts of alumina micropowder, 1 part of 180-mesh passivated metal aluminum powder and 0.5 part of magnesium aluminum alloy powder; 5.0 parts of paper pulp waste liquid with an additional binding agent. Magnesium in the magnesium aluminum alloy powder: the mass ratio of aluminum is 1:1.
the preparation method of the hydration-resistant magnesia-spinel brick of the embodiment is the same as that of the embodiment 1
Example 6
The hydration-resistant magnesia spinel brick of the embodiment is different from the embodiment 1 in that the preparation raw materials contain more magnesium-aluminum alloy powder, and the preparation raw materials comprise the following components in percentage by mass:
16 parts of fused magnesia particles with the granularity of 5-3mm, 32 parts of fused magnesia particles with the granularity of 3-1mm, 18 parts of fused magnesia particles with the granularity of 1-0.5mm, 4 parts of fused magnesia particles with the granularity of 0.5-0mm, 12 parts of 200-mesh fused magnesia fine powder, 10 parts of 200-mesh magnesia spinel, 3 parts of alumina micropowder, 2 parts of 180-mesh passivated metal aluminum powder and 3 parts of magnesium aluminum alloy powder; 2.7 parts of paper pulp waste liquid as an external binding agent. Magnesium in the magnesium aluminum alloy powder: the mass ratio of aluminum is 1:1.
example 7
The hydration-resistant magnesia spinel brick of the embodiment is different from the embodiment 1 in that the preparation raw materials contain less magnesium-aluminum alloy powder, and the preparation raw materials comprise the following components in percentage by mass:
16 parts of fused magnesia particles with the granularity of 5-3mm, 32 parts of fused magnesia particles with the granularity of 3-1mm, 18 parts of fused magnesia particles with the granularity of 1-0.5mm, 4 parts of fused magnesia particles with the granularity of 0.5-0mm, 12 parts of 200-mesh fused magnesia fine powder, 10 parts of 200-mesh magnesia spinel, 3 parts of alumina micropowder, 4.5 parts of 180-mesh passivated metal aluminum powder and 0.5 part of magnesium aluminum alloy powder; 2.7 parts of paper pulp waste liquid as an external binding agent. Magnesium in the magnesium aluminum alloy powder: the mass ratio of aluminum is 1:1.
example 8
The difference between the hydration-resistant magnesia spinel brick of the embodiment and the embodiment 1 is that in the magnesium-aluminum alloy powder, magnesium: the mass ratio of aluminum is 2:1.
example 9
The difference between the hydration-resistant magnesia spinel brick of the embodiment and the embodiment 1 is that in the magnesium-aluminum alloy powder, magnesium: the mass ratio of aluminum is 1:2.
comparative example 1
The magnesium spinel brick of the present comparative example differs from that of example 1 in that the preparation raw material does not contain passivated metal aluminum powder, and the preparation raw material comprises the following components in percentage by mass:
16 parts of fused magnesia particles with the granularity of 5-3mm, 32 parts of fused magnesia particles with the granularity of 3-1mm, 18 parts of fused magnesia particles with the granularity of 1-0.5mm, 4 parts of fused magnesia particles with the granularity of 0.5-0mm, 12 parts of 200-mesh fused magnesia fine powder, 10 parts of 200-mesh magnesia spinel, 3 parts of alumina micropowder and 5 parts of magnesium-aluminum alloy powder; 2.7 parts of bonding agent phenolic resin is added. Magnesium in the magnesium aluminum alloy powder: the mass ratio of aluminum is 1:1.
comparative example 2
The magnesium spinel brick of the comparative example is different from the magnesium aluminum alloy powder in example 1 in that the preparation raw materials do not contain the magnesium aluminum alloy powder, and the preparation raw materials comprise the following components in percentage by mass:
16 parts of fused magnesia particles with the granularity of 5-3mm, 32 parts of fused magnesia particles with the granularity of 3-1mm, 18 parts of fused magnesia particles with the granularity of 1-0.5mm, 4 parts of fused magnesia particles with the granularity of 0.5-0mm, 12 parts of 200-mesh fused magnesia fine powder, 10 parts of 200-mesh magnesia spinel, 3 parts of alumina micropowder and 5 parts of passivated aluminum powder; 2.7 parts of bonding agent phenolic resin is added.
TABLE 1
As can be seen from the data in table 1, the hydration-resistant magnesia-spinel brick obtained in each example of the present invention has significantly better hydration-resistant and powder-resistant properties and better volume stability than the magnesia-spinel of comparative example 1, which does not use the passivated aluminum powder. The magnesium spinel brick of the comparative example 2 has the advantage that the oxidation resistance of the magnesium spinel brick is reduced compared with that of the magnesium spinel brick of each embodiment of the application by using the passivated aluminum powder only without adding the magnesium aluminum alloy powder. In the examples of the present application, the examples 1 to 3 are preferred over the examples 4 and 5 in that the mass percentage of each component is in a more preferred range, and the combination property is better. Examples 6 and 7 are different from example 1 in the addition amount of magnesium aluminum alloy powder and passivated metal aluminum powder, wherein the magnesium aluminum alloy powder in example 6 is excessively added, and the oxidation resistance is slightly higher than that in example 1, but the volume stability is obviously deteriorated, and the magnesium aluminum alloy powder in example 7 is excessively reduced, and the oxidation resistance is lower. Examples 8 and 9 are different from example 1 in magnesium aluminum alloy powder in magnesium aluminum alloy ratio, and their combination properties are inferior to example 1, showing that the magnesium aluminum alloy powder preferably has a magnesium aluminum ratio of 1:1.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. The hydration-resistant magnesium spinel brick is characterized by comprising the following raw materials in percentage by mass:
60-90% of fused magnesia, 5-20% of magnesia-alumina spinel, 0.5-5% of alumina micropowder, 1-12% of passivated metal aluminum powder and 0.08-3% of magnesium aluminum alloy powder; the total of the components is 100%;
the adhesive also comprises 1-5% of the total mass of the components.
2. The hydration-resistant magnesia spinel brick of claim 1, wherein:
the preparation raw materials of the hydration-resistant magnesia spinel brick comprise the following components in percentage by mass:
77-82% of electric smelting magnesia, 10-15% of magnesia-alumina spinel, 1-3% of alumina micropowder, 3-8% of passivated metal aluminum powder and 0.1-2% of magnesium aluminum alloy powder; the total of the components is 100%;
the adhesive also comprises 2.5% -3% of the total mass of the components.
3. The hydration-resistant magnesia spinel brick of claim 1, wherein:
the content of Al in the passivated metal aluminum powder is more than or equal to 98 percent, and the granularity of the passivated metal aluminum powder is 180-325 meshes.
4. The hydration-resistant magnesia spinel brick of claim 1, wherein:
in the magnesium-aluminum alloy powder, magnesium: the mass ratio of aluminum is 1: (0.8-1.2); the granularity of the magnesium-aluminum alloy powder is 150-200 meshes.
5. The hydration-resistant magnesia spinel brick of claim 1, wherein:
in the fused magnesia, the MgO content is more than or equal to 98.0wt percent, the CaO content is less than or equal to 1.0wt percent, and the SiO content is less than or equal to 1.0wt percent 2 The content is less than or equal to 0.8wt%; the grain size of the fused magnesia is more than or equal to 600 mu m, and the volume density of the grains of the fused magnesia is more than or equal to 3.40g/cm 3 。
6. The hydration-resistant magnesia spinel brick of claim 1, wherein:
the fused magnesia comprises particles with the granularity of 5-3mm, particles with the granularity of 3-1mm, particles with the granularity of 1-0.5mm, particles with the granularity of 0.5-0mm and 200-320 meshes of fine powder;
particles having a particle size of 5-3 mm: particles having a particle size of 3-1 mm: particles having a particle size of 1-0.5 mm: particles having a particle size of 0.5-0 mm: the mass ratio of the 200-320 mesh fine powder is 16-22:28-34:16-20:0-5:8-18.
7. The hydration-resistant magnesia spinel brick of claim 1, wherein:
the magnesia-alumina spinel is one or the combination of two of electric melting magnesia-alumina spinel and sintering magnesia-alumina spinel; the magnesium aluminum tipIn the spar, al 2 O 3 The content is 72-78-wt%, the MgO content is 20-28%, siO 2 The content is less than or equal to 0.5wt percent, and the FeO content is less than or equal to 0.5wt percent; the granularity of the magnesia-alumina spinel is 200-325 meshes.
8. A method for preparing the hydration-resistant magnesia-spinel brick as claimed in any one of claims 1 to 7, comprising the steps of:
and (3) mixing the fused magnesia, the magnesia spinel, the alumina micropowder, the passivated metal aluminum powder, the magnesium aluminum alloy powder and the bonding agent, then forming the mixed raw materials on a large-tonnage brick press under a negative pressure environment, and then baking and dehydrating to obtain the hydration-resistant magnesia spinel brick.
9. The method of manufacturing according to claim 8, wherein:
the steps of mixing the fused magnesia, the magnesia spinel, the alumina micro powder, the passivated metal aluminum powder, the magnesium aluminum alloy powder and the bonding agent are specifically as follows:
firstly, premixing fused magnesia particles with the granularity of 5-3mm, fused magnesia particles with the granularity of 3-1mm, fused magnesia particles with the granularity of 1-0.5mm and fused magnesia particles with the granularity of 0.5-0mm for 2-3min, adding a bonding agent for mixing for 3-5min, adding fused magnesia fine powder with the granularity of 200-320 meshes, magnesia spinel, alumina micropowder, passivated metal aluminum powder and magnesium aluminum alloy powder, and continuously mixing for 10-15min.
10. The method of manufacturing according to claim 8, wherein:
the baking temperature is 200-240 ℃ and the baking time is 40-45h.
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