CN114213114B - High-temperature-resistant and anti-erosion corundum-mullite brick and preparation method thereof - Google Patents
High-temperature-resistant and anti-erosion corundum-mullite brick and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of building materials, in particular to a high-temperature-resistant and anti-erosion corundum mullite brick and a preparation method thereof.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a corundum-mullite brick with high temperature resistance and erosion resistance and a preparation method thereof.
Background
Mullite (3 Al) 2 O 3 ·2SiO 2 ) Is Al 2 O 3 -2SiO 2 The binary solid solution stable under normal pressure in the binary system has excellent performances of high temperature resistance, high mechanical strength, small heat conductivity coefficient and the like. Corundum (alpha-Al) 2 O 3 ) Is the most stable phase in the alumina, the O atoms in the crystal structure are packed in a hexagonal closest manner, and the Al atoms are filled in two thirds of oxygen atom octahedral pores to form a chemical formula of Al2O 3; al and O in the corundum are closely packed, and Al-O in the crystal has strong chemical bonds between positive ions and negative ions and larger lattice energy, so that the corundum has excellent performances of corrosion resistance, high melting point, high mechanical strength, good wear resistance and the like.
In recent years, along with the discovery of the excellent properties of corundum and mullite, a great deal of research has been carried out on the application of corundum and mullite in the preparation of building materials.
For example: patent No. 201410058798.5 discloses a light corundum-mullite refractory brick and a preparation method thereof, wherein 0.5-1wt% of silicon oxide micro powder and 2-4wt% of active alpha-alumina micro powder are uniformly dispersedPreparing modified silica sol in 5-8wt% silica sol; vacuumizing the porous corundum-mullite ceramic particles in a vacuum stirrer to 2.5kPa, keeping the pressure constant for 3min, pouring the modified silica sol into the vacuum stirrer under the same pressure condition, stirring for 10min, closing a vacuumizing system, pouring the porous corundum-mullite ceramic fine powder, the corundum fine powder, the silicon oxide micro powder and the active alpha-alumina micro powder into the vacuum stirrer, uniformly stirring under normal pressure, carrying out mechanical compression molding to obtain a blank, drying the blank at 110 ℃ for 24-48h, and carrying out heat preservation at 1400-1600 ℃ for 2-10h to prepare the corundum-mullite ceramic particle composite material; the adopted porous corundum-mullite ceramic particles are prepared by mixing coal gangue and aluminum hydroxide powder, adding water and magnesium carbonate powder, stirring and molding to obtain a blank; drying at 110 deg.C for 4-24 hr, and firing at 1450-1600 deg.C or 1600-1650 deg.C for 1-8 hr to obtain ceramic; crushing, sieving, and selecting particles with particle size of 5-0.1mm as ceramic particles and particles with particle size less than 88 μm as fine powder. The apparent porosity is 31-53%, the average pore diameter is 3-15 μm, and the volume density is 1.57-2.26g/cm 3 The refractory brick with the breaking strength of 4-18MPa has the advantages of low heat conductivity, high strength and strong medium erosion resistance.
For another example: the patent No. 201410106583.6 discloses a corundum-mullite composite brick for COREX furnace and its preparation, which adopts corundum-mullite homogeneous material, corundum, andalusite, alpha-alumina powder, combines clay and pulp waste liquid, and is prepared by the steps of classifying, crushing and multi-stage homogenizing bauxite, mixing with industrial alumina powder to prepare a mixture, grinding, vacuum filtering, extruding and forming, drying, burning in a tunnel kiln for heat preservation, naturally cooling to room temperature to obtain the corundum-mullite homogeneous material, crushing into two different particle size particles, preparing a pug from a homogenizing mixture, pressing into a brick blank, and controlling the volume density to be 3.2-3.4g/cm 3 The tonnage of the pressed and formed product is 630T, and the product is obtained by drying in a drying kiln, sintering, keeping the temperature and discharging from the kiln; the porosity of the obtained composite brick is low and is less than 16%, the compressive strength is more than 110MPa, the thermal shock stability is more than 30 times, the load softening temperature is more than 1680 ℃, and all indexes of the composite brick are superior to those of a common corundum-mullite brick.
For another example: patent No. 201710632929.X discloses a lightweight corundum-mullite pouring material and preparation thereof, wherein porous corundum-mullite ceramic particles are used as aggregates, the particle composition is 3-5mm,1-2.8mm,0.088-0.9mm, then porous corundum-mullite ceramic fine powder with the particle size of less than 0.088mm and the nano-aperture, corundum fine powder, silica micropowder and alpha-alumina micropowder are used as substrates, calcium aluminate cement and rho-alumina are used as bonding agents, the aggregates are stirred in a stirrer, the substrates, the bonding agents and a water reducing agent are uniformly mixed and then poured into the stirrer to be stirred for 3-5min, water is added to be stirred for 5-10min, and the lightweight corundum-mullite pouring material is obtained through pouring and vibration molding; the corundum-mullite ceramic is prepared by heating and insulating aluminum hydroxide fine powder in a high-temperature furnace, then heating and insulating, and cooling to prepare alumina powder with high porosity; then preparing and stirring the high-porosity alumina powder, the silica sol and the silicon dioxide micro powder to form a mixture, and then calcining the mixture in a high-temperature furnace at high temperature to prepare the high-porosity alumina silica gel. Curing at room temperature for 12h, drying at 110 deg.C for 12h, and maintaining at 1500 deg.C for 3h to obtain the final product with apparent porosity of 25-50%, volume density of 1.62-2.30g/cm3, average pore diameter of 300-1500nm, and compressive strength of 45-130MPa.
Therefore, in the prior art, a great deal of research is already carried out on the preparation of the corundum-mullite as the raw material into the building material, and great progress is made, so that the corresponding performance of the corundum-mullite building material is greatly improved, for example: the material has high cost of raw materials such as silicon powder and the like adopted in the prior art, and the corrosion resistance effect of the corundum-mullite building material is still not ideal, and the material also becomes a focus of attention of technicians in the field.
In view of the above, researchers created by the invention fully consider the characteristic performance of the waste residues, and prepare the corundum mullite brick by using the aluminum-rich slag as a raw material, so that the characteristics of breaking strength, compressive strength, apparent porosity, thermal shock stability and the like are guaranteed, the alkali scouring erosion resistance effect is improved, and a new idea is provided for the field of preparation of the corundum mullite brick.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a corundum-mullite brick with high temperature resistance and erosion resistance and a preparation method thereof.
The method is realized by the following technical scheme:
one of the purposes of the invention is to provide a preparation method of a corundum mullite brick with high temperature resistance and erosion resistance, which comprises the following steps:
(1) Adding water into the aluminum-rich slag, grinding the aluminum-rich slag into slurry, casting, molding, drying, calcining, crushing, screening, selecting particles with the particle size of less than 0.015mm as fine aggregate, and selecting particles with the particle size of 0.015-0.075mm as coarse aggregate;
(2) Mixing fine aggregate with alpha-Al 2 O 3 Adding the powder into a waste paper pulp solution, and stirring for 10-30min at the speed of 800-1000r/min to obtain modified fine aggregate;
(3) Vacuumizing the coarse aggregate in a vacuum stirrer to 2.8-3.0kPa, keeping the pressure constant for 5min, adding the modified fine aggregate under the condition of constant pressure, stirring for 5min at 300-500r/min, closing a vacuumizing system of the vacuum stirrer, adding silicon supplement auxiliary materials, stirring uniformly, and performing extrusion forming to obtain a blank;
(4) Heating and drying the blank body from 25 ℃, preserving heat at 1200-1500 ℃ for 1-3h, and naturally cooling to normal temperature to obtain the product.
The corundum mullite brick is prepared by adopting the process of aluminum-rich slag grinding, casting molding, drying, calcining and crushing, then carrying out modification treatment on fine aggregate by waste paper pulp solution, then stirring and mixing the coarse aggregate and the modified fine aggregate under the vacuum condition, enhancing the mixing uniformity of the coarse aggregate and the modified fine aggregate, adding silicon-supplementing auxiliary materials, stirring uniformly, carrying out extrusion molding, then carrying out drying and high-temperature heat preservation treatment, and the like.
In the invention, in the step (1), the slurry is a 200-mesh sieved bottom liquid; the drying is baking at 80-100 ℃ to constant weight; the calcination is carried out for 2-5h at 1500-1580 ℃.
In the step (1), silicon supplement auxiliary materials accounting for 1-3% of the mass of the aluminum-rich slag are added into the aluminum-rich slag before the aluminum-rich slag is ground by adding water, such as: waste slag obtained from blast furnace smelting of vanadium titano-magnetite is used as silicon supplement auxiliary material.
In the invention, the step (2) comprises the following steps of: alpha-Al 2 O 3 Powder: waste pulp solution = 15-20; and the lignin content in the waste paper pulp solution is 2.0-2.4g/cm 3 。
In the invention, the step (3) comprises the following steps of: the modified fine aggregate =1, and the addition amount of the silicon supplement auxiliary material accounts for 10-50% of the mass of the coarse aggregate.
In the invention, the silicon supplement auxiliary material is selected from but not limited to high-silicon vanadium slag or modified high-silicon vanadium slag. The modified high-silicon vanadium slag is prepared by adding aluminum-rich slag into high-silicon vanadium slag, mixing, drying, grinding and screening. The adding amount of the aluminum-rich slag accounts for 3-5% of the mass of the high-silicon vanadium slag, and the aluminum-rich slag is prepared by firstly treating the high-silicon vanadium slag at the temperature of 200-400 ℃ for 30-50min, then treating the high-silicon vanadium slag at the temperature of 1800-2000 ℃ for 10-20min, and then feeding the high-silicon vanadium slag into a grinding machine to grind and pass through a 300-mesh sieve. The aluminum-rich slag is added into the high-silicon vanadium slag for treatment, so that Al is formed 2 O 3 -SiO 2 The mullite structure of a binary system realizes the supplement and addition of silicon supplement auxiliary materials and enhances the strength and the corrosion resistance of the obtained corundum mullite brick.
In the invention, in the step (4), the heating speed is 0.1-0.3 ℃/min, the heating and drying time is 4-5h, and the heat preservation time is 3-5h.
The invention also aims to provide the high-temperature-resistant and anti-corrosion corundum-mullite brick prepared by the method.
Compared with the prior art, the technical effects created by the invention are as follows:
the invention has simple process flow and easy control, can fully utilize the aluminum-rich slag generated in the development and production process of the aluminum industry as a raw material, and then prepare the corundum mullite brick by adding silicon-containing materials to treat and extract other valuable component metals, not only can solve the phenomena of abusing digging and adopting resources such as rich and economic and poor bauxite acquisition, but also can integrate the technologies of grinding, forming, drying, calcining and homogenizing the aluminum-rich slag as the raw material to prepare coarse aggregate and fine aggregate, providing lignin modified fine aggregate by waste paper pulp solution, mixing the modified fine aggregate and the coarse aggregate in vacuum, adding and forming silicon supplement auxiliary materials, baking the mixture into the corundum brick at high temperature and the like, and ensure that the high-quality thermal shock mullite aggregate is prepared by using poor-quality waste slag as the raw material, so that the brick has the characteristics of low porosity, high strength, excellent stability against heat shock, strong alkali corrosion resistance and the like.
The invention has the advantages of easily obtained raw materials, low cost, simple treatment process and easy realization of industrialized popularization and application.
Drawings
FIG. 1 is a flow chart of the overall process of the invention.
FIG. 2 is a process flow diagram of a process for preparing silicon supplement-containing auxiliary materials.
Detailed Description
The technical solution of the present invention is further defined in the following description with reference to the accompanying drawings and the specific embodiments, but the scope of the claimed invention is not limited to the description.
As shown in FIG. 1, in this embodiment, the preparation method of the corundum-mullite brick with high temperature resistance and erosion resistance comprises the following steps:
(1) Adding water into the aluminum-rich slag, grinding the aluminum-rich slag into slurry, casting, molding, drying, calcining, crushing, screening, selecting particles with the particle size of less than 0.015mm as fine aggregate, and selecting particles with the particle size of 0.015-0.075mm as coarse aggregate; the fine aggregate and the coarse aggregate in the particle size range are selected for grading the particle size, so that the subsequent formed corundum-mullite structure is guaranteed to be compact, and the excellent volume stability is guaranteed.
(2) Mixing fine aggregate with alpha-Al 2 O 3 Adding the powder into a waste paper pulp solution, and stirring for 10-30min at the speed of 800-1000r/min to obtain modified fine aggregate; selecting corundum phase (alpha-Al) 2 O 3 Powder) and fine aggregate are added into the waste paper pulp solution,under the action of lignin, fine aggregate modification treatment is realized, the homogeneity of subsequent corundum-mullite phase formation is guaranteed, the overall strength and the corrosion resistance of a brick body are improved, the stirring speed and the stirring time adopted in the method are not limited to the range, and the stirring and mixing can be more uniform, such as 30min for 800r/min stirring, 20min for 900r/min stirring, 30min for 1000r/min stirring, 10min for 800r/min stirring, 10min for 1000r/min stirring, 30min for 1100r/min stirring and the like.
(3) Vacuumizing the coarse aggregate in a vacuum stirrer to 2.8-3.0kPa, keeping the pressure constant for 5min, adding the modified fine aggregate under the condition of constant pressure, stirring for 5min at 300-500r/min, closing a vacuumizing system of the vacuum stirrer, adding silicon supplement auxiliary materials, stirring uniformly, and performing extrusion forming to obtain a blank; the evacuation pressure used in this step is only required to be within a corresponding range, and may be selected from, for example, 2.8kPa,2.9kPa,3.0kPa, etc.; after the modified aggregate is added, the stirring speed is selected to be 300r/min,400r/min and 500r/min, for example, as long as the stirring speed can mix the modified fine aggregate.
(4) Heating and drying the blank body from 25 ℃, preserving heat at 1200-1500 ℃ for 1-3h, and naturally cooling to normal temperature to obtain the product. In this step, as for the temperature, it is only necessary to be within the above range, for example, 1200 ℃,1250 ℃,1300 ℃,1400 ℃,1500 ℃ and the like are selected as long as the temperature control is within the range.
In this embodiment, in step (1), the slurry is a 200 mesh sieved underflow; the drying is carried out by baking at 80-100 deg.C to constant weight, such as 80 deg.C, 85 deg.C, 95 deg.C, 100 deg.C, etc.; the calcination is carried out for 2-5h at 1500-1580 ℃, for example: 1500 ℃,1530 ℃,1550 ℃,1580 ℃ and the like are selected, and the heat preservation time can be selected from the following steps: 2h,2.5h,3.5h,4h,5h, and the like.
In this embodiment, in the step (1), before the aluminum-rich slag is ground by adding water, silicon-supplementing auxiliary materials accounting for 1-3% of the mass of the aluminum-rich slag are added, for example: 1%,1.5%,2.5%,3%, etc. are optionally added.
In this embodiment, the step (2) is carried out in a mass ratio ofFine aggregate: alpha-Al 2 O 3 Powder: waste pulp solution = 15-20; and the lignin content in the waste paper pulp solution is 2.0-2.4g/cm 3 For example, the mass ratio is selected as: 3, 20 3 ，2.1g/cm 3 ，2.3g/cm 3 ，2.4g/cm 3 And so on.
In this embodiment, in the step (3), the coarse aggregate: modified fine aggregate =1, for example selected from: 1, 2, 1. The silicon supplementing auxiliary material is high-silicon vanadium slag or modified high-silicon vanadium slag.
In this embodiment, as shown in fig. 1 and fig. 2, the modified high silicon vanadium slag is prepared by mixing, drying, grinding and sieving aluminum-rich slag and high silicon vanadium slag. The aluminum-rich slag accounts for 3-5% of the high-silicon vanadium slag, for example, 3%,4%,5% and the like are selected, and the aluminum-rich slag is firstly treated at the temperature of 200-400 ℃ for 30-50min and then treated at the temperature of 1800-2000 ℃ for 10-20min during drying, and then is sent into a grinding machine to be ground and sieved by a 300-mesh sieve, so that the high-silicon vanadium slag is obtained.
In the embodiment, in the step (4), the temperature rise speed is 0.1-0.3 ℃/min, the temperature rise drying time is 4-5h, and the heat preservation time is 3-5h. By adopting the heating rate treatment, the temperature in the drying process can be gradually increased, the continuous pushing and discharging of the moisture in the aluminum-rich slag forming block is promoted, the mechanical structure performance of the aluminum-rich slag extrusion forming block is avoided, the strength and compactness of the forming block are improved when the heat preservation treatment is carried out at the calcining temperature of 1200-1500 ℃, the compactness of the structure in the crystal phase of the formed corundum-mullite structure is ensured, and the overall strength and the corrosion resistance of the mullite brick are ensured. In the actual operation, the temperature can be increased by 0.1 deg.C/min, 0.2 deg.C/min, 0.3 deg.C/min, 0.4 deg.C/min, etc.
The invention may be practiced otherwise than as specifically described with reference to the prior art or to the common general knowledge of those skilled in the art. Meanwhile, in order to verify the technical effect of the corundum-mullite brick brought by the technical scheme of the invention to a greater extent, the research team develops the following related researches through a laboratory.
The high-silicon vanadium slag adopted by the invention is waste slag obtained by blast furnace smelting of vanadium titano-magnetite, and the main components of the high-silicon vanadium slag are as follows: siO 2 2 29.31％，V 2 O 5 5.98％，CaO7.58％，P 2 O 5 1.42％，TFe24.6％，TiO 2 6.32％，Cr 2 O 3 4.41％，MgO0.32％，MnO9.24％。
The aluminum-containing slag produced by extracting ferrosilicon from aluminum-containing materials such as red stone columns and the like by adopting a reduction method mainly comprises the following components: al (aluminum) 2 O 3 73.41％，SiO 2 7.13％，Fe 2 O 3 1.11% and CaO1.69%. The slag can be used for extracting alumina. The invention relates to a method for extracting aluminum-containing slag, which takes waste slag generated after the aluminum-containing slag is extracted and produced by aluminum oxide as raw material, wherein the main components are as follows: al (Al) 2 O 3 28.31％，SiO 2 15.49％，Fe 2 O 3 2.37％，CaO5.72％。
Example 1
The preparation method of the high-temperature-resistant and anti-erosion corundum-mullite brick comprises the following steps:
(1) Adding water into the aluminum-rich slag, grinding the aluminum-rich slag into slurry, sieving the slurry by a 200-mesh sieve to obtain a sieve bottom liquid, casting and molding, baking the slurry to constant weight at 80 ℃, preserving heat for 2 hours at 1500 ℃, crushing and screening, selecting particles with the particle size of less than 0.015mm as fine aggregates, and selecting particles with the particle size of 0.015-0.075mm as coarse aggregates;
(2) Mixing fine aggregate with alpha-Al 2 O 3 Adding the powder into a waste paper pulp solution, and stirring at 800r/min for 10min to obtain modified fine aggregate; the weight ratio of the fine aggregate: alpha-Al 2 O 3 Powder: waste pulp solution = 15; and the lignin content in the waste paper pulp solution is 2.0g/cm 3 ；
(3) Vacuumizing the coarse aggregate in a vacuum stirrer to 2.8kPa, keeping the pressure constant for 5min, and calculating the coarse aggregate according to the mass ratio under the condition of constant pressure: adding the modified fine aggregate =1 into the raw material 2, stirring for 5min at 300r/min, closing a vacuum pumping system of a vacuum stirrer, adding high-silicon vanadium slag accounting for 10% of the mass of the coarse aggregate, uniformly stirring, and carrying out extrusion forming to obtain a blank;
(4) Heating and drying the blank body at 25 deg.C at a heating rate of 0.3 deg.C/min for 5h, maintaining the temperature at 1500 deg.C for 3h, and naturally cooling to normal temperature.
The average value of 10 samples is obtained through detection: the apparent porosity is 14 percent, and the volume density is 3.01g/cm 3 The breaking strength is 11.2MPa, the compressive strength is 121.2MPa, the thermal shock resistance stability is more than 30 times, and the breaking strength is 10.9MPa after the sodium hydroxide solution with the concentration of 10% is soaked for 1 d; al (Al) 2 O 3 80.1% of SiO 2 The content was 16.7%.
Example 2
The preparation method of the high-temperature-resistant and anti-erosion corundum-mullite brick comprises the following steps:
(1) Adding water into the aluminum-rich slag, grinding the aluminum-rich slag into slurry, sieving the slurry by a 200-mesh sieve to obtain a sieve bottom liquid, casting and molding, baking the slurry to constant weight at 100 ℃, preserving heat at 1580 ℃ for 5 hours, crushing and sieving the slurry, selecting particles with the particle size of less than 0.015mm as fine aggregates and selecting particles with the particle size of 0.015-0.075mm as coarse aggregates;
(2) Mixing fine aggregate with alpha-Al 2 O 3 Adding the powder into a waste paper pulp solution, and stirring at 1000r/min for 30min to obtain modified fine aggregate; the weight ratio of the fine aggregate: alpha-Al 2 O 3 Powder: waste pulp solution = 20; and the lignin content in the waste paper pulp solution is 2.4g/cm 3 ；
(3) Vacuumizing the coarse aggregate in a vacuum stirrer to 3.0kPa, keeping the pressure constant for 5min, and taking the coarse aggregate in mass ratio under the condition of constant pressure: adding the modified fine aggregate =1 in the ratio of 5, stirring for 5min at 500r/min, closing a vacuum-pumping system of a vacuum stirrer, adding high-silicon vanadium slag accounting for 50% of the mass of the coarse aggregate, uniformly stirring, and performing extrusion forming to obtain a blank;
(4) Heating and drying the blank body at a heating rate of 0.1 ℃/min for 4h from 25 ℃, then preserving heat for 3h, preserving heat for 1h at a temperature of 1200 ℃, and naturally cooling to normal temperature to obtain the product.
The average value of 10 samples is detected to obtain: the apparent porosity is 15 percent, and the volume density is 3.03g/cm 3 The breaking strength is 11.7MPa, the compressive strength is 126.1MPa, the thermal shock resistance stability is more than 30 times, and the breaking strength is 11.2MPa after the sodium hydroxide solution with the concentration of 10% is soaked for 1 d; al (Al) 2 O 3 The content of SiO is 81.2 percent 2 The content was 16.9%.
Example 3
The preparation method of the high-temperature-resistant and anti-erosion corundum-mullite brick comprises the following steps:
(1) Adding water into the aluminum-rich slag, grinding the aluminum-rich slag into slurry, sieving the slurry by a 200-mesh sieve, taking a sieve base solution, casting and molding, baking the slurry to constant weight at 90 ℃, then preserving heat at 1530 ℃ for 3 hours, crushing and screening, selecting particles with the particle size of less than 0.015mm as fine aggregates and selecting particles with the particle size of 0.015-0.075mm as coarse aggregates;
(2) Mixing fine aggregate with alpha-Al 2 O 3 Adding the powder into a waste paper pulp solution, and stirring at 900r/min for 20min to obtain modified fine aggregate; the weight ratio of the fine aggregate: alpha-Al 2 O 3 Powder: waste pulp solution = 17; and the lignin content in the waste paper pulp solution is 2.3g/cm 3 ；
(3) Vacuumizing the coarse aggregate in a vacuum stirrer to 2.9kPa, keeping the pressure constant for 5min, and calculating the coarse aggregate according to the mass ratio under the condition of constant pressure: adding the modified fine aggregate =1 by 3, stirring for 5min at 400r/min, closing a vacuumizing system of a vacuum stirrer, adding high-silicon vanadium slag accounting for 20% of the mass of the coarse aggregate, uniformly stirring, and performing extrusion forming to obtain a blank;
(4) Heating and drying the blank body at a heating speed of 0.2 ℃/min for 4h from 25 ℃, then preserving heat for 5h, preserving heat at 1300 ℃ for 2h, and naturally cooling to normal temperature to obtain the product.
The average value of 10 samples is obtained through detection: the apparent porosity is 12 percent, and the volume density is 3.08g/cm 3 The breaking strength is 11.3MPa, the compressive strength is 121.8MPa, the thermal shock resistance stability is more than 30 times, and the sodium hydroxide solution with the concentration of 10 percent is adoptedThe breaking strength after the solution soaking treatment for 1d is 10.8MPa; al (Al) 2 O 3 The content of SiO is 81.4 percent 2 The content is 16.6%.
Example 4
On the basis of the embodiment 1, the other steps are the same as the embodiment 1, and high-silicon vanadium slag accounting for 1 percent of the mass of the aluminum-rich slag is added and uniformly mixed before the aluminum-rich slag enters a grinding machine.
The average value of 10 samples is obtained through detection: the apparent porosity is 13 percent, and the volume density is 3.06g/cm 3 The breaking strength is 11.9MPa, the compressive strength is 130.2MPa, the thermal shock resistance stability is more than 30 times, and the breaking strength is 11.6MPa after the sodium hydroxide solution with the concentration of 10% is soaked for 1 d; al (Al) 2 O 3 The content of SiO is 81.8 percent 2 The content was 17.1%.
Example 5
Based on the embodiment 1, the other steps are the same as the embodiment 1, and before the aluminum-rich slag enters a grinding mill, high-silicon vanadium slag accounting for 3 percent of the mass of the aluminum-rich slag is added and uniformly mixed.
The average value of 10 samples is obtained through detection: the apparent porosity was 11%, and the bulk density was 3.12g/cm 3 The breaking strength is 12.4MPa, the compressive strength is 131.7MPa, the thermal shock resistance stability is more than 30 times, and the breaking strength after soaking for 1d by adopting a sodium hydroxide solution with the concentration of 10 percent is 12.3MPa; al (Al) 2 O 3 Content of 81.4%, siO 2 The content was 16.8%.
Example 6
On the basis of the embodiment 1, the other steps are the same as the embodiment 1, the high-silicon vanadium slag is modified to prepare modified high-silicon vanadium slag, and the modified high-silicon vanadium slag is added, wherein the modified high-silicon vanadium slag is prepared by adding and mixing aluminum-rich slag accounting for 3% of the mass of the high-silicon vanadium slag, drying at 200 ℃ for 30min, drying (calcining) at 1800 ℃ for 10min, and then grinding in a grinder to pass through a 300-mesh sieve, so as to obtain the high-silicon vanadium slag.
The average value of 10 samples is obtained through detection: the apparent porosity is 10 percent, and the volume density is 3.19g/cm 3 The breaking strength is 12.7MPa, the compressive strength is 131.1MPa, the thermal shock resistance stability is more than 30 times, and the part is soaked by a 10 percent sodium hydroxide solutionThe breaking strength after treatment for 1d is 12.5MPa; al (Al) 2 O 3 Content of 79.6%, siO 2 The content was 19.2%.
Example 7
On the basis of the embodiment 1, the other steps are the same as the embodiment 1, the high-silicon vanadium slag is modified to prepare modified high-silicon vanadium slag, and the modified high-silicon vanadium slag is added, wherein the modified high-silicon vanadium slag is prepared by adding and mixing aluminum-rich slag accounting for 5% of the mass of the high-silicon vanadium slag, drying (calcining) at 2000 ℃ for 50min at 400 ℃, and then grinding (calcining) in a grinder for 20min, and finally grinding in a 300-mesh sieve to obtain the high-silicon vanadium slag.
The average value of 10 samples is detected to obtain: the apparent porosity is 11%, and the volume density is 3.16g/cm 3 The breaking strength is 12.6MPa, the compressive strength is 131.8MPa, the thermal shock resistance stability is more than 30 times, and the breaking strength after the soaking treatment for 1 day by adopting a sodium hydroxide solution with the concentration of 10 percent is 12.5MPa; al (Al) 2 O 3 80.7% of SiO 2 The content was 18.1%.
Example 8
Based on the embodiment 4, the other steps are the same as the embodiment 4, the high-silicon vanadium slag is modified to prepare modified high-silicon vanadium slag, the modified high-silicon vanadium slag is added, the aluminum-rich slag accounts for 4% of the mass of the high-silicon vanadium slag, the modified high-silicon vanadium slag is added and mixed, after drying treatment is carried out at 300 ℃ for 40min, drying treatment (calcination) is carried out at 1900 ℃ for 15min, and then the modified high-silicon vanadium slag is sent into a grinder to be ground and sieved by a 300-mesh sieve, so that the modified high-silicon vanadium slag is obtained.
The average value of 10 samples is obtained through detection: the apparent porosity is 10 percent, and the volume density is 3.18g/cm 3 The breaking strength is 13.1MPa, the compressive strength is 132.3MPa, the thermal shock resistance stability is more than 30 times, and the breaking strength after soaking for 1d by adopting a sodium hydroxide solution with the concentration of 10 percent is 12.8MPa; al (Al) 2 O 3 80.9% of SiO 2 The content was 17.2%.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (2)
1. A preparation method of a high-temperature-resistant and anti-erosion corundum-mullite brick is characterized by comprising the following steps:
(1) Adding water into the aluminum-rich slag, grinding the aluminum-rich slag into slurry, casting, molding, drying, calcining, crushing, screening, selecting particles with the particle size of less than 0.015mm as fine aggregate, and selecting particles with the particle size of 0.015-0.075mm as coarse aggregate;
(2) Mixing fine aggregate with alpha-Al 2 O 3 Adding the powder into a waste paper pulp solution, and stirring for 10-30min at the speed of 800-1000r/min to obtain modified fine aggregate;
(3) Vacuumizing the coarse aggregate in a vacuum stirrer to 2.8-3.0kPa, keeping the pressure constant for 5min, adding the modified fine aggregate under the condition of constant pressure, stirring for 5min at 300-500r/min, closing a vacuumizing system of the vacuum stirrer, adding silicon supplement auxiliary materials, stirring uniformly, and performing extrusion forming to obtain a blank;
(4) Heating and drying the blank body from 25 ℃, preserving heat at 1200-1500 ℃ for 1-3h, and naturally cooling to normal temperature to obtain the product;
the step (1), the slurry is a sieve-base solution which is sieved by a 200-mesh sieve; the drying is baking at 80-100 ℃ to constant weight; the calcination is carried out for 2-5h at 1500-1580 ℃;
adding silicon supplement auxiliary materials accounting for 1-3% of the mass of the aluminum-rich slag into the aluminum-rich slag before adding water and grinding;
the step (2) is that the fine aggregate is calculated according to the mass ratio: alpha-Al 2 O 3 Powder: waste pulp solution = 15-20; and the lignin content in the waste paper pulp solution is 2.0-2.4g/cm 3 ；
The step (3) is that the mass ratio of coarse aggregate: 2-5, wherein the addition amount of the silicon supplement auxiliary material accounts for 10-50% of the mass of the coarse aggregate;
the silicon supplementing auxiliary material is modified high-silicon vanadium slag;
the modified high-silicon vanadium slag is prepared by adding aluminum-rich slag into high-silicon vanadium slag, mixing, drying, heat treating, grinding and screening;
the adding amount of the aluminum-rich slag accounts for 3-5% of the mass of the high-silicon vanadium slag, and the aluminum-rich slag is prepared by processing at 200-400 ℃ for 30-50min, processing at 1800-2000 ℃ for 10-20min, and grinding in a grinder and sieving with a 300-mesh sieve.
2. The method for preparing the corundum-mullite brick with high temperature resistance and erosion resistance as claimed in claim 1, wherein in the step (4), the temperature rising speed is 0.1-0.3 ℃/min, the temperature rising drying time is 4-5h, and the heat preservation time is 3-5h.
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