Long-life alumina-silica refractory for glass kiln and method for producing the same

Abstract

This invention relates to a long-life aluminosilicate refractory material for glass kilns, belonging to the technical field of refractory materials. The long-life aluminosilicate refractory material for glass kilns of this invention comprises, by weight percentage: 50-75 wt% bauxite clinker, with an Al2O3 content ≥85 wt%; 15-30 wt% silicon carbide powder, with a SiC content ≥98 wt%; 3-10 wt% boron nitride micropowder, with a BN content ≥99 wt%; and 2-10 wt% albite. The additives are sodium carboxymethyl cellulose and aluminum orthophosphate sol, with the sodium carboxymethyl cellulose used at 0.3-0.8 wt% of the total raw material weight, and the aluminum orthophosphate sol used at 3-6 wt% of the total raw material weight. The refractory material is fired under a nitrogen atmosphere. This long-life aluminosilicate refractory material for glass kilns breaks through the performance limits of traditional aluminosilicate refractory materials, providing key material support for the green and low-carbon development of the glass industry.

Description

Technical Field

[0001] This invention relates to the technical field of refractory materials for the glass industry. Specifically, this invention relates to a long-life aluminosilicate refractory material suitable for high-temperature areas such as regenerators and melting sections of glass melting furnaces, and its preparation method. Background Technology

[0002] As a fundamental industry of the national economy, the glass industry's furnaces operate under extreme conditions of high temperature, high alkali, and high thermal shock. Statistics show that my country's float glass production lines have an annual melting capacity of 1.4 billion tons, but the service life of refractory materials in key areas such as the melting and storage sections of glass furnaces is generally less than 18 months, resulting in annual maintenance costs exceeding 2 billion yuan.

[0003] Traditional aluminosilicate refractories face the following main technical challenges in harsh environments such as the regenerator lattice and melting section of glass furnaces: failure of alkali corrosion resistance mechanisms. Alkali metal oxides such as K₂O and Na₂O in the glass batch volatilize at high temperatures, forming alkali vapors (concentrations reaching 200-500 ppm), which undergo complex chemical reactions with traditional aluminosilicate refractories, such as phase transformation damage: alkali vapors react with mullite (3Al₂O₃·2SiO₂) to form potassium nepheline (KAlSiO₄), which then reacts with red pillars... The reaction of Al₂O₃·SiO₂ with leucite (KAlSi₂O₆) produces leucite (KAlSi₂O₆), accompanied by a 10-15% volume expansion, leading to a network of microcracks within the material; structural collapse: after alkali metals penetrate into the material, they form a low-melting-point eutectic with SiO₂ (e.g., Na₂O·2SiO₂ has a melting point of only 1088℃), causing structural spalling under thermal stress; accelerated degradation: every 100℃ temperature rise increases the alkali vapor erosion rate by 2-3 times, leading to an exponential decrease in the material's service life. The thermomechanical properties are contradictory; traditional aluminosilicate refractories have inherent defects in their thermophysical properties: thermal expansion mismatch: mullite (α=5.3×10⁻⁶) -6 / ℃) and corundum (α=8.8×10 -6The difference in linear expansion coefficients (°C) leads to internal stress during thermal shock, and the number of water-cooling cycles at 1100°C is usually less than 20. Strength decay mechanism: the formation of liquid phases (such as anorthite and calcium aluminum feldspar) at high temperatures leads to grain boundary slippage, and the room temperature compressive strength decreases by 40-60% after treatment at 1400°C for 3 hours. Creep deformation: under a load of 0.2 MPa, the creep of traditional materials reaches 1.5-2.0% at 1500°C for 50 hours, posing a risk of collapse. Material-alkali vapor interface failure problem: existing materials have inherent defects in resisting alkali-thermal coupling corrosion: low penetration threshold: when porosity > 15%, alkali vapor penetration depth can reach 5-8 mm / month, forming continuous corrosion channels; adverse reaction kinetics: the Al-O bond energy (512 kJ / mol) is lower than the Si-O bond energy (624 kJ / mol), causing Al2O3 to preferentially participate in the reaction; lack of protective layer: lacking self-healing function, corrosion products cannot form a stable protective layer, and the corrosion rate increases linearly with service time.

[0004] The aforementioned technical challenges severely restrict the green and low-carbon development of the glass industry, and there is an urgent need to develop a new aluminum-silicon refractory material system with independent intellectual property rights. Summary of the Invention

[0005] This invention addresses the stringent requirements of refractory materials in the extreme service environment of glass kilns. By combining material composition design and process innovation, it constructs an aluminosilicate refractory material system with multi-dimensional synergistic optimization of "erosion resistance, heat transfer, and load bearing," providing key material support for the green and low-carbon development of the glass industry.

[0006] The long-life aluminosilicate refractory material for glass kilns of the present invention comprises, by weight percentage, 50-72 wt% bauxite clinker, wherein the content of Al2O3 in the bauxite clinker is ≥85 wt%; 15-30 wt% silicon carbide powder, wherein the content of SiC in the silicon carbide powder is ≥98 wt%; 3-10 wt% boron nitride micro powder, wherein the content of BN in the boron nitride micro powder is ≥99 wt%; and 5-10 wt% albite, wherein the albite contains ≥11 wt% Na2O and ≤2.5 wt% K2O. The admixtures are sodium carboxymethyl cellulose and aluminum orthophosphate sol, wherein the amount of sodium carboxymethyl cellulose is 0.3-0.8 wt% of the total weight of the raw materials, and the amount of aluminum orthophosphate sol is 3-6 wt% of the total weight of the raw materials. The refractory material is fired under a nitrogen protective atmosphere.

[0007] The microstructure of the aluminum-silicon refractory material contains 5-12 vol% AlN whiskers and 25-35 vol% mullite phase.

[0008] The AlN whiskers have a diameter of 0.5-2 μm and an aspect ratio of 5-15.

[0009] The mullite phase consists of needle-like grains with an aspect ratio ≥ 3:1.

[0010] The microstructure also includes residual boron nitride.

[0011] The residual boron nitride is distributed in a lamellar form at the grain boundaries.

[0012] The aluminum-silicon refractory material exhibits the following characteristics: erosion depth of alkaline vapor at 1600℃ for 50 hours ≤ 1.2 mm; residual flexural strength retention rate after 50 water cooling cycles at 1100℃ ≥ 75%; load softening temperature ≥ 1700℃; and creep rate at 1500℃ for 50 hours ≤ 0.8%.

[0013] This invention also relates to a method for preparing the above-mentioned long-life aluminosilicate refractory material for glass furnaces, which includes the following steps: ① Mix bauxite clinker, silicon carbide powder, boron nitride micro powder, and sodium feldspar in a certain proportion, and then ball mill to obtain a mixed powder; ② Add additives, wet mix, age, and then vacuum knead the mud; ③Isostatic pressing is used to form the blank, which is then dried to obtain the blank. ④ Staged firing: Firing under a N2 protective atmosphere, with a heating rate of 5℃ / min from room temperature to 800℃; a heating rate of 3℃ / min from 800℃ to 1400℃; a heating rate of 1℃ / min from 1400℃ to 1500℃, and holding at 1500℃ for 1~4 hours.

[0014] The bauxite clinker is composed of extra-grade high-alumina bauxite with an Al2O3 content ≥ 88wt% and first-grade high-alumina bauxite with an Al2O3 content ≥ 82wt%; the silicon carbide powder contains ≤ 0.5wt% free carbon and ≤ 0.3wt% Fe2O3; the boron nitride micro powder has a specific surface area ≥ 20m² / g and a layer spacing d. (002) The nanometer diameter is 0.335-0.340 nm; the albite contains ≥11wt% Na2O and ≤2.5wt% K2O.

[0015] The isostatic pressing process employs a bidirectional pressurization process, with a pressing pressure of 150~200MPa and a holding time of ≥90 seconds.

[0016] Compared with the prior art, the long-life aluminosilicate refractory material for glass furnaces of the present invention has the following beneficial effects: The long-life aluminosilicate refractory material for glass kilns of this invention abandons the traditional Cr2O3 modification approach and adopts a gradient firing process. This not only reduces energy consumption but also breaks through the performance limits of traditional aluminosilicate refractory materials, providing key material support for the green and low-carbon development of the glass industry. The material's lifespan in the regenerator lattice of the glass kiln is extended to 36 months; the kiln thermal efficiency is increased by 8-12%; the energy consumption per unit of molten glass is reduced to below 1200 kcal / kg; and the alkali metal emission concentration is <5 mg / m³. 3 It can meet the ultra-low emission requirements of GB 26453-2022. Detailed Implementation

[0017] The technical solution of the present invention will be further explained clearly and completely below with reference to specific embodiments.

[0018] The long-life aluminosilicate refractory material for glass kilns of the present invention comprises, by weight percentage: 50-72 wt% bauxite clinker, wherein the Al2O3 content in the bauxite clinker is ≥85 wt%; 15-30 wt% silicon carbide powder, wherein the SiC content in the silicon carbide powder is ≥98 wt%; 3-10 wt% boron nitride micropowder, wherein the BN content in the boron nitride micropowder is ≥99 wt%; and 5-10 wt% albite. The additives are sodium carboxymethyl cellulose and aluminum orthophosphate sol, wherein the amount of sodium carboxymethyl cellulose is 0.3-0.8 wt% of the total weight of the raw materials, and the amount of aluminum orthophosphate sol is 3-6 wt% of the total weight of the raw materials. The bauxite clinker is composed of extra-grade high-alumina bauxite with an Al2O3 content ≥88 wt% and first-grade high-alumina bauxite with an Al2O3 content ≥82 wt%. The free carbon content in the silicon carbide powder is ≤0.5 wt%, and the Fe2O3 content is ≤0.3 wt%. The specific surface area of ​​the boron nitride micro powder is ≥20m². 2 / g, interlayer spacing d (002) The nanometer size is 0.335-0.340 nm. The albite contains ≥11 wt% Na2O, ≤2.5 wt% K2O, and ≤0.6 wt% Fe2O3.

[0019] The method for preparing long-life aluminosilicate refractory materials for glass furnaces of the present invention includes the following steps: ① Mix bauxite clinker, silicon carbide powder, boron nitride micro powder, and sodium feldspar according to the raw material ratio, and ball mill for 2-4 hours to obtain mixed powder; ② Add additives, wet mix for 15-20 minutes, age for 8-12 hours, then vacuum knead into mud; ③Isostatic pressing adopts a bidirectional pressurization process with a pressure of approximately 150Pa-200MPa and a holding time of ≥90 seconds. The product is dried at 120℃ for 24 hours to obtain the blank. ④ Staged firing: The billet is fired under a N2 protective atmosphere, with a heating rate of 5℃ / min from room temperature to 800℃; a heating rate of 3℃ / min from 800℃ to 1400℃; and a heating rate of 1℃ / min from 1400℃ to 1500℃, and held at 1500℃ for 1~4 hours.

[0020] The microstructure of the prepared long-life aluminosilicate refractory for glass furnaces includes: 5-12 vol% AlN whiskers and 25-35 vol% mullite phase; the AlN whiskers have a diameter of 0.5-2 μm and a length of 5-15 μm; the mullite phase consists of needle-like grains with an aspect ratio ≥3:1; the microstructure also includes residual boron nitride, which is distributed in a lamellar form at the grain boundaries.

[0021] This invention employs a ternary synergistic system of "bauxite clinker-silicon carbide powder-boron nitride," supplemented with albite to regulate phase transformation: the bauxite clinker is compounded from extra-grade high-alumina bauxite (Al2O3≥88wt%) and first-grade high-alumina bauxite (Al2O3≥82wt%) to form a gradient Al2O3 content structure, ensuring high-temperature strength while reducing raw material costs; a dense packing is constructed through particle size distribution (3-5mm large particles + 1-3mm medium particles + <0.088mm fine powder), with apparent porosity controlled at 12-15%; the silicon carbide powder is selected from high-purity β-SiC (free carbon ≤0.5wt%, Fe2O3≤0.3wt%), whose oxidation produces SiO2 and Al2O3. The reaction at the site generates mullite, producing a self-reinforcing effect and hindering the permeation path of alkali vapor; boron nitride micropowder introduces a layered BN structure, which reacts with Al2O3 at temperatures above 1400℃ to generate AlN whiskers (0.5-2μm in diameter, aspect ratio 5-15); the BN sheets transform into a glassy phase at high temperatures (BN+Al2O3→AlN+liquid B2O3), forming a "liquid film lubrication layer" at the grain boundaries, reducing thermal expansion mismatch stress; the high Na2O content (≥11wt%) in albite promotes the formation of a liquid phase, forming a liquid phase of 3-5 vol% during sintering; the K2O content ≤2.5wt% effectively inhibits alkali metal volatilization, and the Fe2O3 ≤0.6wt% reduces pigment pollution.

[0022] From room temperature to 800℃ (5℃ / min), organic matter slowly decomposes, forming a carbon network prestructure; from 800℃ to 1400℃ (3℃ / min), aluminum phosphate sol undergoes in-situ polymerization; from 1400℃ to 1500℃ (1℃ / min), the heating rate is controlled to prevent excessive growth of AlN whiskers; N2 atmosphere protection is maintained throughout the firing process, inhibiting AlN oxidation and promoting the conversion of BN to AlN; isostatic pressing optimizes the bidirectional pressure process, improving the uniformity of green body density to ≥98%; vacuum kneading of green body removes air bubbles, reducing apparent porosity to 10-12%.

[0023] In the long-life aluminosilicate refractory material for glass furnaces prepared by this invention, an AlN-SiC composite dense layer (bulk density ≥3.0 g / cm³) is formed at a depth of 0-2 mm from the surface. 3 The structure features: >80% closed pores with a pore size <1μm, effectively blocking alkali vapor penetration and inhibiting the reaction between K2O and Al2O3; an intermediate transition layer 2-5mm from the surface, consisting of an AlN whisker network, SiC whiskers, and mullite interwoven to form a three-dimensional framework with an elastic modulus of 150-220GPa and a gradient distribution; and a core layer above 5mm from the surface retaining a controllable mesoporous structure (pore size 2-5μm), alleviating thermal stress concentration. The AlN-SiC interface transfers load through coherent interface bonding (lattice matching degree >90%), inhibiting crack propagation; grain boundary optimized nano-AlPO4 (content ≥25wt%) agglomerates at grain boundaries, hindering dislocation movement and inhibiting abnormal grain growth. β-Al2O3 generated from the decomposition of micro-densified albite fills the pores, reducing the initiation of microcracks during thermal shock. Under high-temperature application conditions, SiO2 generated by the oxidation of silicon carbide powder reacts with Al2O3 to form mullite, which compensates for sintering shrinkage; the preferentially oriented AlN whiskers grow directionally along the heat flow direction, which improves the high-temperature creep resistance.

[0024] Compared with traditional aluminosilicate refractory materials, the aluminosilicate refractory material of this invention has the following characteristics: the erosion depth of alkaline vapor at 1600℃ for 50h is ≤1.2mm; after 50 water cooling cycles at 1100℃, the residual flexural strength retention rate is ≥75%; the load softening temperature is ≥1700℃; and the creep rate at 1500℃ for 50h is ≤0.8%. Example

[0025] The refractory material in this embodiment uses high-purity bauxite clinker (Al2O3≥85wt%) as the core matrix, compounded with extra-grade high-alumina bauxite (Al2O3≥88wt%) and first-grade high-alumina bauxite (Al2O3≥82wt%) to form a gradient Al2O3 structure; supplemented with silicon carbide powder (SiC≥98wt%, free carbon≤0.5wt%) and boron nitride micro powder (BN≥99wt%, D 50 A synergistic enhancement system was constructed using particles with a particle size of 1-3 μm, and albite (Na₂O ≥ 11 wt%, K₂O ≤ 2.5 wt%) was added to regulate liquid phase formation. An organic-inorganic composite binder of sodium carboxymethyl cellulose and aluminum orthophosphate sol was used as the admixture. This embodiment employs a multi-level particle size gradient: bauxite clinker is combined in three levels: 3-5 mm large particles, 1-3 mm medium particles, and <0.088 mm fine powder, forming a dense packing structure. Boron nitride micropowder is nanoscale (D... 50 =1-3μm) and silicon carbide powder microcrystals (D 50The albite (0.5-2μm) forms a microscopic "maze effect," hindering alkali vapor penetration. Sodium feldspar is generated in a liquid phase at 1100℃ (β-Al₂O₃ melt), optimizing sintering and densification while simultaneously suppressing alkali metal volatilization. This gradation design balances high-temperature mechanical properties with resistance to erosion and penetration. The preparation method of this refractory material is as follows: The above-mentioned bauxite clinker, silicon carbide powder, boron nitride micro powder, and albite were mixed in proportion and ball-milled for 3 hours (ball-to-material ratio 3:1). Binder addition: A composite binder was added, and the mixture was wet-mixed for 18 minutes (80 rpm); after aging for 10 hours, the mixture was vacuum-kneaded. Molding and drying: Isostatic pressing (pressure 180 MPa, holding time 120 seconds); drying at 120℃ for 24 hours until the green body density reached 55% of the theoretical value. Gradient firing: Heating regime (N2 atmosphere protection): room temperature → 800℃ (5℃ / min), 800 → 1400℃ (3℃ / min); 1400 → 1500℃ (1℃ / min); holding stage: 1500℃ × 2 hours; cooling method: furnace cooling to 800℃ followed by air cooling.

[0026] The mass percentage of raw materials used in each embodiment is detailed in Table 1.

[0027] Table 1

[0028] Comparative Example 1

[0029] The refractory material in this comparative example is mainly composed of high-purity bauxite clinker (Al2O3≥85wt%), compounded with extra-grade high-alumina bauxite (Al2O3≥88wt%) and first-grade high-alumina bauxite (Al2O3≥82wt%) to form a gradient Al2O3 structure; supplemented with silicon carbide powder (SiC≥98wt%, free carbon≤0.5wt%) and albite (Na2O≥11wt%, K2O≤2.5wt%). The admixture is an organic-inorganic composite binder of sodium carboxymethyl cellulose and aluminum orthophosphate sol.

[0030] A multi-stage particle size gradient ratio is adopted: bauxite clinker is combined in three stages: 3-5mm large particles, 1-3mm medium particles, and <0.088mm fine powder, forming a dense packing structure. The D-type of silicon carbide powder microcrystals... 50=0.5-2μm. The preparation method of the refractory material of this comparative example is as follows: The above bauxite clinker, silicon carbide powder and albite are mixed in proportion and ball-milled for 3 hours (ball-to-material ratio 3:1). Binder addition: Add composite binder and wet stir for 18 minutes (speed 80 rpm); after aging for 10 hours, vacuum knead the clay. Molding and drying: Isostatic pressing (pressure 180MPa, holding time 120 seconds); drying at 120℃ for 24 hours, the density of the green body reaches 55% of the theoretical value. Gradient firing: Heating regime (N2 atmosphere protection) room temperature → 800℃ (5℃ / min), 800 → 1400℃ (3℃ / min); 1400 → 1500℃ (1℃ / min); holding stage 1500℃ × 2 hours; cooling method: furnace cooling to 800℃ followed by air cooling.

[0031] Comparative Example 2

[0032] The refractory material in this comparative example uses high-purity bauxite clinker (Al2O3≥85wt%) as the core matrix, compounded with extra-grade high-alumina bauxite (Al2O3≥88wt%) and first-grade high-alumina bauxite (Al2O3≥82wt%) to form a gradient Al2O3 structure; supplemented with silicon carbide powder (SiC≥98wt%, free carbon≤0.5wt%) and boron nitride micro powder (BN≥99wt%, D 50 A synergistic enhancement system was constructed using particles with a thickness of 1-3 μm, and sodium carbonate (Na₂O ≥ 58 wt%, K₂O ≤ 2.5 wt%) was added to regulate liquid phase formation. An organic-inorganic composite binder of sodium carboxymethyl cellulose and aluminum orthophosphate sol was used as the admixture.

[0033] A multi-stage particle size gradient ratio is adopted: bauxite clinker is combined in three stages: 3-5mm large particles, 1-3mm medium particles, and <0.088mm fine powder, forming a dense packing structure. Boron nitride micropowder is applied at the nanoscale (D... 50 =1-3μm) and silicon carbide powder microcrystals (D 50 =0.5-2μm). The preparation method of the refractory material of the comparative example is as follows: The above bauxite clinker, silicon carbide powder, boron nitride micro powder and sodium carbonate are mixed in proportion and ball-milled for 3 hours (ball-to-material ratio 3:1). Binder addition: Add composite binder and wet stir for 18 minutes (speed 80 rpm); after aging for 10 hours, vacuum knead the clay. Molding and drying: Isostatic pressing (pressure 180MPa, holding time 120 seconds); drying at 120℃ for 24 hours, the density of the green body reaches 55% of the theoretical value. Gradient firing: Heating regime (N2 atmosphere protection) room temperature → 800℃ (5℃ / min), 800 → 1400℃ (3℃ / min); 1400 → 1500℃ (1℃ / min); holding stage 1500℃ × 2 hours; cooling method: furnace cooling to 800℃ followed by air cooling.

[0034] The mass percentage of raw materials used in Comparative Examples 1 and 2 is detailed in Table 2.

[0035] Table 2

[0036] The performance of the aluminosilicate refractory materials of each embodiment and comparative example was tested, and the results are shown in Table 3.

[0037] Table 3

[0038] The above description is merely a preferred embodiment of the present invention, and the present invention highlights its essential features through the above embodiments. Those skilled in the art should understand that any equivalent substitution of the raw materials used or substitution of known means, made without departing from the concept and essence of the present invention, falls within the protection scope of the present invention and is not limited to the specific embodiments described above.

Claims

1. A long-life aluminosilicate refractory material for glass furnaces, characterized in that: The raw materials, by weight percentage, consist of 50-72 wt% bauxite clinker, with an Al2O3 content ≥85 wt%; 15-30 wt% silicon carbide powder, with a SiC content ≥98 wt%; 3-10 wt% boron nitride micro powder, with a BN content ≥99 wt%; and 5-10 wt% albite, with Na2O ≥11 wt% and K2O ≤2.5 wt%. The additives are sodium carboxymethyl cellulose and aluminum orthophosphate sol, with sodium carboxymethyl cellulose used at 0.3-0.8 wt% of the total raw material weight and aluminum orthophosphate sol used at 3-6 wt% of the total raw material weight. The refractory material is fired under a N2 protective atmosphere.

2. The long-life aluminosilicate refractory material for glass furnaces according to claim 1, characterized in that: The microstructure of the aluminosilicate refractory material contains 5-12 vol% AlN whiskers and 25-35 vol% mullite phase.

3. The long-life aluminosilicate refractory material for glass kilns according to claim 2, characterized in that: The AlN whiskers have a diameter of 0.5-2 μm and an aspect ratio of 5-15.

4. The long-life aluminosilicate refractory material for glass kilns according to claim 2, characterized in that: The mullite phase consists of needle-like grains with an aspect ratio ≥ 3:

1.

5. The long-life aluminosilicate refractory material for glass kilns according to claim 2, characterized in that: The microstructure also includes residual boron nitride.

6. The long-life aluminosilicate refractory material for glass furnaces according to claim 5, characterized in that: The residual boron nitride is distributed in a lamellar form at the grain boundaries.

7. The long-life aluminosilicate refractory material for glass furnaces according to claim 2, characterized in that: The aluminosilicate refractory material exhibits an erosion depth of ≤1.2mm from alkaline vapor at 1600℃ for 50h; a residual flexural strength retention rate of ≥75% after 50 water-cooling cycles at 1100℃; a load softening temperature of ≥1700℃; and a creep rate of ≤0.8% at 1500℃ for 50h.

8. The method for preparing the long-life aluminosilicate refractory material for glass furnaces according to any one of claims 1-7, characterized in that... Includes the following steps: ① Mix bauxite clinker, silicon carbide powder, boron nitride micro powder, and sodium feldspar in a certain proportion, and then ball mill to obtain a mixed powder; ② Add additives, wet mix, age, and then vacuum knead the mud; ③Isostatic pressing is used to form the blank, which is then dried to obtain the blank. ④ Staged firing: Firing under a N2 protective atmosphere, with a heating rate of 5℃ / min from room temperature to 800℃; a heating rate of 3℃ / min from 800℃ to 1400℃; a heating rate of 1℃ / min from 1400℃ to 1500℃, and holding at 1500℃ for 1~4 hours.

9. The method for preparing long-life aluminosilicate refractory material for glass furnaces according to claim 8, characterized in that: The bauxite clinker is composed of extra-grade high-alumina bauxite with an Al2O3 content ≥ 88wt% and first-grade high-alumina bauxite with an Al2O3 content ≥ 82wt%; the silicon carbide powder contains ≤ 0.5wt% free carbon and ≤ 0.3wt% Fe2O3; the boron nitride micro powder has a specific surface area ≥ 20m² / g and a layer spacing d. (002) The nanometer diameter is 0.335-0.340 nm; the albite contains ≥11wt% Na2O and ≤2.5wt% K2O.

10. The method for preparing long-life aluminosilicate refractory material for glass furnaces according to claim 8, characterized in that: The isostatic pressing process adopts a bidirectional pressurization process, with a pressing pressure of 150~200MPa and a holding time of ≥90 seconds.

Images