CN114213114A - 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, which are characterized in that thick and thin aggregates are prepared by adopting aluminum-rich slag grinding-casting molding-drying-calcining-crushing processes, then the thin aggregates are modified by waste paper pulp solution, then the thick aggregates and the modified thin aggregates are stirred and mixed under the vacuum condition, the mixing uniformity of the thick and the thin aggregates is enhanced, and the silicon supplementing auxiliary materials are added and stirred uniformly, extruded and molded, and then dried and subjected to high-temperature heat preservation treatment to prepare the corundum mullite brick, the waste residues are fully utilized to replace the raw materials of the molded alumina powder, silicon micropowder and the like, so that the obtained corundum mullite brick has higher flexural strength and compressive strength, and the alkali corrosion resistance is enhanced, the process flow of preparing the corundum-mullite building material is simplified, the raw material sources are enriched, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a high-temperature-resistant and anti-corrosion corundum-mullite brick and a preparation method thereof.
Background
Mullite (3 Al)2O3·2SiO2) Is Al2O3-2SiO2The stable binary solid solution in the binary system under normal pressure has the advantages of high temperature resistance, high mechanical strength, small heat conductivity coefficient and the likeAnd (4) different performances. Corundum (alpha-Al)2O3) Is the most stable phase in alumina, the O atoms in the crystal structure are packed closest to the hexagonal bodies, 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 its preparation, wherein 0.5-1 wt% of silica micropowder and 2-4 wt% of active alpha-alumina micropowder are uniformly dispersed in 5-8 wt% of silica sol to prepare modified 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 to stir for 10min under the same pressure condition, 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, performing mechanical compression molding to obtain a blank, drying the blank at 110 ℃ for 24-48h, and then preserving the heat at 1400 ℃ and 1600 ℃ for 2-10 h; 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 ℃ for 4-24h, and then sintering at 1450-1600 ℃ or 1600-1650 ℃ for 1-8h to obtain the 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/cm3The 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 methodUsing corundum-mullite homogeneous material, white jade-steel, andalusite, alpha-alumina powder, clay and paper pulp waste liquor, classifying and crushing high-alumina bauxite, multi-stage homogenizing, mixing with industrial alumina powder to prepare a mixture, grinding, vacuum-filtering, extruding, forming, drying, firing in a tunnel kiln to preserve heat, naturally cooling to room temperature to obtain the corundum-mullite homogeneous material, crushing into two different particle sizes, preparing into mud material by using homogeneous ingredients, pressing into a brick blank, and controlling the volume density to be 3.2-3.4g/cm3The 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 taking out of 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 number 201710632929.X discloses a lightweight corundum-mullite pouring material and preparation thereof, porous corundum-mullite ceramic particles are used as aggregates, the particle composition is 3-5mm, 1-2.8mm and 0.088-0.9mm in particle size, then porous corundum-mullite ceramic fine powder with the particle size of less than 0.088mm and the nanometer 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 poured into the stirrer to be stirred for 3-5min after being uniformly mixed, water is added into the mixture 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 ℃ for 12h, and keeping the temperature at 1500 ℃ for 3h to obtain the material with the apparent porosity of 25-50%, the volume density of 1.62-2.30g/cm3, the average pore diameter of 300-1500nm and the compressive strength of 45-130 MPa.
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 high-temperature-resistant and anti-corrosion corundum-mullite brick 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-Al2O3Adding the powder into a waste paper pulp solution, and stirring for 10-30min at the speed of 1000r/min of 800-;
(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 500r/min under the condition of 300-;
(4) heating and drying the blank body from 25 ℃, preserving heat at the temperature of 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 liquid; the drying is baking at 80-100 ℃ to constant weight; the calcination is carried out for 2-5h at the temperature of 1580 ℃ in 1500-year mode.
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-Al2O3Powder: waste paper pulp solution 15-20:5-7: 15-20; and the lignin content in the waste paper pulp solution is 2.0-2.4g/cm3。
In the invention, the step (3) comprises the following steps of: the modified fine aggregate is 1:2-5, and the adding amount of the silicon supplementing 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 obtained 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 grinding the high-silicon vanadium slag in a grinder and sieving the high-silicon vanadium slag with a 300-mesh sieve. The aluminum-rich slag is added into the high-silicon vanadium slag for treatment, so thatTo obtain it as Al2O3-SiO2The 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 3-5 h.
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 invention has the technical effects that:
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 the raw material, and then prepare the corundum mullite brick by adding the silicon-containing material to treat and extract other valuable component metals, not only can solve the phenomena of abusing digging and adopting resources such as bauxite and the like, but also can prepare the coarse aggregate and the fine aggregate by grinding, forming, drying, calcining and homogenizing the aluminum-rich slag as the raw material, then provide the lignin modified fine aggregate by waste paper pulp solution, mix the modified fine aggregate and the coarse aggregate in vacuum, supplement the silicon auxiliary material to add and form, and bake the high-quality aggregate for the mullite brick at high temperature, and the like, thereby ensuring that the brick has low porosity and low quality waste slag as the raw material to prepare the high-quality aggregate for the mullite brick, and the brick has the advantages of low porosity and low mass, High strength, excellent thermal shock resistance, 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 the overall process flow diagram created by the present 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-Al2O3Adding the powder into a waste paper pulp solution, and stirring for 10-30min at the speed of 1000r/min of 800-; selecting corundum phase (alpha-Al)2O3Powder) and fine aggregate are added into the waste paper pulp solution, so that the fine aggregate is modified under the action of lignin, the homogeneity of the subsequent corundum-mullite phase composition is ensured, the integral 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 in the range, and the stirring and mixing can be more uniform as long as the stirring and mixing can be met, for example, the stirring speed is selectable but not limited to 800r/min for 30min, 900r/min for 20min, 1000r/min for 30min, 800r/min for 10min, 1000r/min for 10min, 1100r/min for 30min 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 500r/min under the condition of 300-; the evacuation pressure used in this step is only required to be within a corresponding range, and for example, 2.8kPa, 2.9kPa, 3.0kPa, etc. may be selected; 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 the temperature of 1200-1500 ℃ for 1-3h, and naturally cooling to normal temperature to obtain the product. In this step, the temperature is selected within the above range, for example, 1200 ℃, 1250 ℃, 1300 ℃, 1400 ℃, 1500 ℃ and the like, as long as the temperature control is within the range.
In this embodiment, in the step (1), the slurry is a 200-mesh-screened 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 at 1580 ℃ for 2-5h by 1500-materials, 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, in the step (2), the fine aggregate: alpha-Al2O3Powder: waste paper pulp solution 15-20:5-7: 15-20; and the lignin content in the waste paper pulp solution is 2.0-2.4g/cm3For example, the mass ratio is selected as: 3:1:3, 20:7:20, 17:6:15, 19:5:16, etc., and the content of lignin is selected to be 2.0g/cm3，2.1g/cm3，2.3g/cm3，2.4g/cm3And so on.
In this embodiment, in the step (3), the coarse aggregate: modified fine aggregate 1:2-5, for example, selected from: 1:2, 1:3, 1:4, 1:5 and the like, wherein the adding amount of the silicon supplement auxiliary materials accounts for 10-50% of the mass of the coarse aggregate, for example, 10%, 20%, 30%, 40%, 50% and the like are selected. 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. Specifically, the adding amount of the aluminum-rich slag accounts for 3-5% of the mass of the high-silicon vanadium slag, for example, 3%, 4%, 5% and the like are selected, and the aluminum-rich slag is dried by firstly treating at the temperature of 200-400 ℃ for 30-50min, then treating at the temperature of 1800-2000 ℃ for 10-20min, and then sending the processed aluminum-rich slag into a grinding machine to grind and pass through a 300-mesh sieve, thus obtaining the high-silicon vanadium slag.
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 3-5 h. By adopting the temperature-rising speed 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 plus materials and 1500 ℃, the compactness of the structure in the formed corundum-mullite structure crystal phase is ensured, and the overall strength and the corrosion resistance of the corundum-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 2229.31％，V2O55.98％，CaO7.58％，P2O51.42％，TFe24.6％，TiO26.32％，Cr2O34.41％，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 (Al)2O373.41％，SiO27.13％，Fe2O31.11% 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)2O328.31％，SiO215.49％，Fe2O32.37％，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-Al2O3Adding 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-Al2O3Powder: waste paper pulp solution 15:5: 17; and the lignin content in the waste paper pulp solution is 2.0g/cm3；
(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 in a ratio of 1:2, stirring for 5min at 300r/min, closing a vacuumizing system of a vacuum stirrer, adding high-silicon vanadium slag accounting for 10% 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 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/cm3The 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)2O380.1% of SiO2The 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-Al2O3Adding 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-Al2O3Powder: waste paper pulp solution 20:7: 15; and the lignin content in the waste paper pulp solution is 2.4g/cm3；
(3) Vacuumizing the coarse aggregate in a vacuum stirrer to 3.0kPa, 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 in a ratio of 1:5, stirring for 5min at 500r/min, closing a vacuumizing 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 for 4h at the heating speed of 0.1 ℃/min from 25 ℃, then preserving heat for 3h, preserving heat for 1h at the temperature of 1200 ℃, and naturally cooling to normal temperature to obtain the product.
The average value of 10 samples is obtained through detection: the apparent porosity is 15 percent, and the volume density is 3.03g/cm3The 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)2O3The content of SiO is 81.2 percent2The 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 bottom liquid, casting and molding, baking the slurry to constant weight at 90 ℃, then preserving heat at 1530 ℃ for 3 hours, crushing and screening the slurry, 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-Al2O3Adding 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-Al2O3Powder: waste paper pulp solution 17:6: 20; and the lignin content in the waste paper pulp solution is 2.3g/cm3；
(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 in a ratio of 1:3, stirring for 5min at a speed of 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/cm3The breaking strength is 11.3MPa, the compressive strength is 121.8MPa, the thermal shock resistance stability is more than 30 times, and the breaking strength is 10.8MPa after the sodium hydroxide solution with the concentration of 10% is soaked for 1 d; al (Al)2O3The content of SiO is 81.4 percent2The content was 16.6%.
Example 4
Based on the embodiment 1, the other steps are the same as the embodiment 1, and the 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 the grinding mill.
The average value of 10 samples is obtained through detection: the apparent porosity is 13 percent, and the volume density is 3.06g/cm3The 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)2O3The content of SiO is 81.8 percent2The 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/cm3The breaking strength is 12.4MPa, the compressive strength is 131.7MPa, the thermal shock resistance stability is more than 30 times, and the sodium hydroxide solution with the concentration of 10 percent is adopted for soaking treatmentThe breaking strength after 1d is 12.3 MPa; al (Al)2O3The content of SiO is 81.4 percent2The 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/cm3The breaking strength is 12.7MPa, the compressive strength is 131.1MPa, 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 12.5 MPa; al (Al)2O379.6% of SiO2The 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 at 400 ℃ for 50min, drying (calcining) at 2000 ℃ for 20min, and then grinding in a grinder to pass through a 300-mesh sieve to obtain the high-silicon vanadium slag.
The average value of 10 samples is obtained through detection: the apparent porosity was 11%, and the bulk density was 3.16g/cm3The 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 soaking for 1d by adopting a sodium hydroxide solution with the concentration of 10 percent is 12.5 MPa; al (Al)2O380.7% of SiO2The 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/cm3The 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 12.8 MPa; al (Al)2O380.9% of SiO2The 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 to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
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-Al2O3Adding the powder into a waste paper pulp solution, and stirring for 10-30min at the speed of 1000r/min of 800-;
(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 500r/min under the condition of 300-;
(4) heating and drying the blank body from 25 ℃, preserving heat at the temperature of 1200-1500 ℃ for 1-3h, and naturally cooling to normal temperature to obtain the product.
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 (1), the slurry is a screen bottom solution which is sieved by a 200-mesh screen; the drying is baking at 80-100 ℃ to constant weight; the calcination is carried out for 2-5h at the temperature of 1580 ℃ in 1500-year mode.
3. The method for preparing the high-temperature-resistant and anti-corrosion corundum-mullite brick as claimed in claim 1, wherein 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.
4. The method for preparing the high-temperature-resistant and anti-corrosion corundum-mullite brick as claimed in claim 1, wherein the step (2) comprises the following steps of (1) preparing fine aggregate by mass ratio: alpha-Al2O3Powder: waste paper pulp solution 15-20:5-7: 15-20; and the lignin content in the waste paper pulp solution is 2.0-2.4g/cm3。
5. The method for preparing the high-temperature-resistant and anti-corrosion corundum-mullite brick as claimed in claim 1, wherein the step (3) comprises the following steps of (1) mixing the raw materials in percentage by mass: the modified fine aggregate is 1:2-5, and the adding amount of the silicon supplementing auxiliary material accounts for 10-50% of the mass of the coarse aggregate.
6. The method for preparing the high-temperature-resistant and anti-erosion corundum-mullite brick as claimed in claim 1, 3 or 5, wherein the silicon supplementing auxiliary material is high-silicon vanadium slag or modified high-silicon vanadium slag.
7. The method for preparing the high-temperature-resistant and anti-corrosion corundum-mullite brick as claimed in claim 6, wherein the modified high-silicon vanadium slag is prepared by adding high-silicon vanadium slag into aluminum-rich slag, mixing, drying, grinding and screening.
8. The method for preparing the corundum-mullite brick with high temperature resistance and erosion resistance as claimed in claim 7, wherein the amount of the aluminum-rich slag accounts for 3-5% of the weight of the high silicon vanadium slag, and the aluminum-rich slag is dried by treating the high silicon vanadium slag at 400 ℃ for 30-50min at 200-.
9. The method for preparing the corundum-mullite brick with high temperature resistance and erosion resistance according to claim 1, wherein in the step (4), the temperature rising speed is 0.1-0.3 ℃/min, the temperature rising and drying time is 4-5h, and the heat preservation time is 3-5 h.
10. A high temperature resistant, erosion resistant corundum-mullite brick produced by the process of any one of claims 1-9.
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