CN113354428B - Erosion-resistant fused zirconia-corundum brick for glass kiln and preparation method thereof - Google Patents
Erosion-resistant fused zirconia-corundum brick for glass kiln and preparation method thereof Download PDFInfo
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Abstract
The invention aims to provide an erosion-resistant fused zirconia-corundum brick for a glass kiln and a preparation method thereof, and the fused zirconia-corundum brick provided by the invention comprises the following components in percentage by mass: 41.0-43.0% of zircon sand, 48.0-51.0% of alumina powder, 1.4-2.0% of soda ash, 3.80-5.90% of zirconia, 0.2-0.7% of rare earth, 0.2-0.8% of andalusite powder and 0.4-1.6% of hydroxypropyl methyl cellulose. By improving the product formula and the process technology, 33 can be greatly reduced#The content of silicon and sodium in the fused zirconia-corundum bricks is reduced, so that the content of a glass phase in the product is reduced, the crystal phase structure of the product is optimized, the erosion resistance of the product in the use of a glass kiln is improved, the service life of the product can be obviously prolonged, the precipitated phase of the glass phase can be reduced, the pollution of the product to glass liquid in the glass kiln is reduced to a certain extent, and the service life of the glass kiln and the quality of the glass product are obviously improved.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to an erosion-resistant fused zirconia-corundum brick for a glass kiln and a preparation method thereof.
Background
The electric melting zirconia-corundum brick is mainly used for a glass kiln, has good molten glass corrosion resistance, rapid cooling and heating resistance and higher thermal load performance, and is applied to various important parts of the melting kiln. The bricks have excellent corrosion and erosion resistance, thanks to their mineral composition and microstructure. However, with the upgrading and upgrading of glass enterprises, the requirements on the quality of the fused zirconia corundum bricks are more strict, and the quality defects of the fused zirconia corundum bricks can directly influence the quality of glass products and the service life of a glass kiln.
Existing 33#The fused zirconia-corundum bricks are mainly used on the tank wall of a glass kiln, and have 32.5% of zirconium content, 1.5% of sodium content and 16% of silicon content. The zircon sand is mixed uniformly by 48.4 percent, alumina powder is mixed by 49.4 percent and soda is mixed by 2.2 percent, the mixture is added into a special electric arc furnace, the mixture is heated and melted by an electrode, and then the mixture is poured into a sand mold, and after heat preservation and annealing, the mixture is cut and ground to obtain a finished product. 33 produced by adopting the existing formula and process#The content of the glass phase of the electric melting zirconia-corundum brick exceeds 20 percent. In the use process of the glass kiln, the product has poor erosion resistance, the glass phase is seriously separated, the crystal phase structure of the product is damaged, the product is peeled off and eroded, and the service life is seriously shortened.
The reason for the poor corrosion resistance is that the fused zirconia corundum brick has high silicon and sodium content and unreasonable crystal phase composition of the product, so that the product is not enough, and in the production process of the fused zirconia corundum brick, certain mullite is generated due to high silicon content, and the mullite is an adverse factor in the fused zirconia corundum brick and can influence the qualification rate of the product. Existing 33#The product formula of the fused zirconia corundum brick has low surface cost, but the final cost and the use effect are not ideal in the aspects of comprehensive qualification rate, service life, customer acceptance and the like.
Chinese patent CN111087231B discloses a production process of a high-stability casting zirconia-corundum brick, which comprises the procedures of mixture preparation, melting, casting, heat preservation annealing and demoulding, wherein ZrO is calculated according to the weight part of the ingredients2+HfO235-40 parts of SiO212-14 parts of Na21.2-1.6 parts of O, 0-3 parts of rare earth and Al2O3The balance is the ingredient is complemented to 100 weight portions; the ingredients comprise clinker and raw material, the mixture ratio of the clinker and the raw material is the same, the clinker is a blocky substance with the grain diameter of 3-8cm, and the raw material is powder with the grain diameter of 0.05-1.5 mm; the clinker accounts for 10-30%. The process can effectively improve the uniformity of the components of the feed liquid and avoid the generation of stripes on the material, but in the melting process, the microwave heating is needed before the raw material enters a furnace body, the microwave heating detection temperature is the surface temperature of the material, a part of high-temperature parts in the raw material are likely to generate liquid phase, the components with low melting point are easy to liquefy, the liquid phase is agglomerated to block the movement of the material, and the components are likely to adhere to equipment, so that the production has high requirements on the equipment, and the industrialization is difficult to realize.
Therefore, a reasonable formula is needed to solve the technical problems, improve the qualification rate and the corrosion resistance of the product and prolong the service life of the product on a glass kiln.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide an anti-corrosion electric melting zirconia-corundum brick for a glass kiln and a preparation method thereof. According to the electric-melting zirconia-corundum brick provided by the invention, the crystal phase structure of the electric-melting zirconia-corundum brick is optimized by improving the product formula and the process technology, so that the quality of the electric-melting zirconia-corundum brick is improved.
The formula of the fused zirconia-corundum brick of the invention is reduced by 33#The content of sodium silicon in the fused zirconia corundum bricks is reduced, so that the content of a glass phase in the fused zirconia corundum bricks is reduced, the precipitated phase of the glass phase is reduced, the pollution of the fused zirconia corundum bricks to glass liquid in a glass kiln is reduced to a certain extent, the erosion resistance of the fused zirconia corundum bricks in the use of the glass kiln is improved, and the service life of the glass kiln can be obviously prolonged.
The technical scheme of the invention is as follows:
an erosion-resistant electric melting zirconia-corundum brick for a glass kiln comprises the following components in percentage by mass: 41.0-43.0% of zircon sand, 48.0-51.0% of alumina powder, 1.4-2.0% of soda ash, 3.8-5.9% of zirconia, 0.2-0.7% of rare earth, 0.2-0.8% of andalusite powder and 0.4-1.6% of hydroxypropyl methyl cellulose.
Further, the erosion-resistant electric melting zirconia-corundum brick for the glass kiln comprises the following components in percentage by mass: 41.9 percent of zircon sand, 49.4 percent of alumina powder, 2.0 percent of soda ash, 4.6 percent of zirconia, 0.4 percent of rare earth, 0.6 percent of andalusite powder and 1.1 percent of hydroxypropyl methyl cellulose.
Further, the preparation method of the erosion-resistant electric melting zirconia-corundum brick for the glass kiln comprises the following steps:
s1: adopting a computer 3D modeling sub-diagram to assign a die diagram of a product, making a model by a foam cutting machine in a model workshop according to the drawing, and making a sand mold by sand casting in a sand mold workshop through the model; the sand mould adopts a self-hardening sand process to reasonably produce blank processing amount, the casting workshop puts the sand mould into a special heat preservation box, fills the hollow silicon-aluminum ball heat preservation material, and then compacts the heat preservation material through a vibrator to wait for casting;
s2: uniformly mixing zircon sand, alumina powder, zirconia, soda ash and hydroxypropyl methyl cellulose by a mixer, adding the mixture into an electric arc furnace by using a spiral feeder, melting the mixture by long electric arc for 60 to 90 minutes, stopping melting after power failure, introducing oxygen into the molten feed liquid by using an oxygen lance, decarbonizing and oxidizing the feed liquid to obtain feed liquid 1;
s3: adding rare earth and andalusite powder into the electric arc furnace in the step S2, melting for 20-40 minutes by long electric arc, stopping melting after power failure, introducing oxygen into the melted feed liquid by using an oxygen lance, and decarbonizing and oxidizing the feed liquid to obtain feed liquid 2;
s4: and (4) tilting the electric arc furnace, pouring the feed liquid 2 obtained in the step S3 into the buried sand mold, carrying out heat preservation annealing for 10-15 days, taking the product out of the heat preservation box, removing the sand mold to obtain a blank product, and cutting and grinding the blank product to obtain the required finished product.
Further, the current of the electric arc furnace in the preparation step is 5700A, and the voltage is 340V.
Further, the flow rate of the decarbonization and oxidation oxygen in the step S3 is 10-14 m3The time is 3.5-5.5 min.
Further, the speed of pouring the feed liquid 2 into the sand mold in the step S4 is 20-26 kg/S.
Further, the heat-preserving annealing rate in the step S4 is 10-40 ℃/h, and the temperature is reduced to 50 ℃.
The invention also provides the erosion-resistant fused zirconia-corundum brick for the glass kiln and the application thereof in preparing the glass kiln.
Because the refractory components melted into the tank furnace influence the solubility of the gas, the refractory materials entering the tank furnace can form a nuclear interface, thereby causing the generation of bubbles; when the refractory materials are not uniformly mixed, the electrically-fused zirconia-corundum bricks can generate stripes; regarding the cracking factor of the electrofusion staggered corundum bricks, according to the pouring thermodynamic theory, the cooling of the cast body is considered to be divided into four stages: cooling the melt when pouring into a mold; heat conduction; melt hardening (crystallization); and (4) cooling the solidified casting body. The characteristics of the third stage hardening (crystallization) process have great influence on the structure of the product and various defects (shrinkage cavity, air hole; crack) formed inside; the fourth stage causes thermal stresses and possible cracking in the already hardened cast body. When bubbles, stripes or cracks appear in the fused zirconia-corundum bricks, Na is contained2The alkaline glass liquid of O can invade into the brick along the air holes and cracks of the brick body and react with the precipitated glass phase (the pool wall electric melting zirconia-corundum brick is acted by the high-temperature glass liquid for a long time (more than 1500 ℃), and the glass in the brickPhase will gradually melt and precipitate) and interpenetration, so that the viscosity of the precipitated glass liquid is reduced, the fluidity is improved, the erosion behavior is further intensified, and the depth is expanded.
Practice proves that when the formula of the fused zirconia-corundum brick contains the element C, when the fused zirconia-corundum brick is used for a lining of a glass kiln, carbon can be separated out from a matrix and enter a glass melt, so that the glass generates bubbles and the molten glass corrosion resistance of a refractory material is reduced. The applicant of the invention creatively adds rare earth, hydroxypropyl methylcellulose and andalusite powder into the formula in the test process, and unexpectedly finds that the rare earth, the hydroxypropyl methylcellulose and the andalusite powder can act synergistically, so that the occurrence of air holes can be reduced to a great extent, and the Na content is reduced2The alkaline glass liquid of O invades into the brick along the air holes and cracks of the brick body, and diffuses and mutually permeates with the precipitated glass phase, so that the erosion behavior is aggravated, and the erosion resistance is improved; and the amount of exudation of the glass phase can be significantly reduced.
In addition, the decarbonization and oxidation operations in steps S2 and S3 of the invention can remove carbon impurities, stir the raw materials to mix the raw materials more uniformly, and improve the erosion resistance of the fused zirconia-corundum brick under the combined action of the rare earth, the hydroxypropyl methyl cellulose and the andalusite powder.
Compared with the prior art, the erosion-resistant fused zirconia-corundum brick for the glass kiln and the preparation method thereof have the following advantages:
(1) the fused zirconia corundum brick product produced by the optimized formula has the advantages of lower content of silicon and sodium, more reasonable internal crystal phase structure, lower content of glass phase than 20 percent, high corrosion resistance degree and capability of obviously prolonging the service life on a glass kiln.
(2) Experiments prove that the rare earth, the hydroxypropyl methyl cellulose and the andalusite powder in the invention can act synergistically, the occurrence of pores can be reduced to a great extent, the apparent porosity of the compact part in the best embodiment of the application is 1.00%, and is obviously reduced by 0.63-1.10% compared with a comparative example.
(3) Experiments prove that the rare earth, the hydroxypropyl methyl cellulose and the andalusite powder in the invention can act synergistically, and the exudation amount of a glass phase can be reduced, wherein the exudation amount of the glass phase in the best embodiment of the application is 0.30, and is obviously reduced by 0.40-0.90 compared with a comparative example.
Detailed Description
The present invention is further illustrated by the following description of specific embodiments, which are not intended to limit the invention, and various modifications and improvements can be made by those skilled in the art based on the basic idea of the invention, but the invention is within the protection scope of the invention.
Wherein, the reagents used in the invention are all common reagents and can be purchased from common reagent production and sale companies.
Example 1
An erosion-resistant electric melting zirconia-corundum brick for a glass kiln comprises the following components in percentage by mass: 43.0 percent of zircon sand, 51.0 percent of alumina powder, 1.4 percent of soda ash, 3.8 percent of zirconia, 0.2 percent of rare earth, 0.2 percent of andalusite powder and 0.4 percent of hydroxypropyl methyl cellulose.
The preparation method comprises the following steps:
s1: adopting a computer 3D modeling sub-diagram to assign a die diagram of a product, making a model by a foam cutting machine in a model workshop according to the drawing, and making a sand mold by sand casting in a sand mold workshop through the model; the sand mould adopts a self-hardening sand process to reasonably produce blank processing amount, the casting workshop puts the sand mould into a special heat preservation box, fills the hollow silicon-aluminum ball heat preservation material, and then compacts the heat preservation material through a vibrator to wait for casting;
s2: uniformly mixing zircon sand, alumina powder, zirconia, soda ash and hydroxypropyl methyl cellulose by a mixer, adding the mixture into an electric arc furnace by using a spiral feeder, melting the mixture by long electric arc for 60 minutes, stopping melting after power failure, introducing oxygen into the molten feed liquid by using an oxygen lance, and decarbonizing and oxidizing the feed liquid to obtain feed liquid 1;
the flow rate of the decarbonization and oxidation oxygen is 10m3H, the time is 3.5 min;
s3: adding rare earth and andalusite powder into the electric arc furnace in the step S2, melting for 20 minutes by long electric arc, stopping melting after power failure, introducing oxygen into the melted feed liquid by using an oxygen lance, and decarbonizing and oxidizing the feed liquid to obtain feed liquid 2;
the flow rate of the decarbonization and oxidation oxygen is 10m3H, the time is 3.5 min;
s4: and (4) tilting the electric arc furnace, pouring the feed liquid 2 obtained in the step S3 into the buried sand mold, carrying out heat preservation annealing for 10 days, taking the product out of the heat preservation box, removing the sand mold to obtain a blank product, and cutting and grinding the blank product to obtain the required finished product.
The rate of pouring the feed liquid 2 into the sand mold in the step S4 was 20 kg/S.
The heat preservation annealing rate in the step S4 is 10 ℃/h, and the temperature is reduced to 50 ℃.
The electric current of the electric arc furnace in the preparation step is 5700A, and the voltage is 340V.
Example 2
An erosion-resistant electric melting zirconia-corundum brick for a glass kiln comprises the following components in percentage by mass: 41.0 percent of zircon sand, 48 percent of alumina powder, 2.0 percent of soda ash, 5.9 percent of zirconia, 0.7 percent of rare earth, 0.8 percent of andalusite powder and 1.6 percent of hydroxypropyl methyl cellulose.
The preparation method comprises the following steps:
s1: adopting a computer 3D modeling sub-diagram to assign a die diagram of a product, making a model by a foam cutting machine in a model workshop according to the drawing, and making a sand mold by sand casting in a sand mold workshop through the model; the sand mould adopts a self-hardening sand process to reasonably produce blank processing amount, the casting workshop puts the sand mould into a special heat preservation box, fills the hollow silicon-aluminum ball heat preservation material, and then compacts the heat preservation material through a vibrator to wait for casting;
s2: uniformly mixing zircon sand, alumina powder, zirconia, soda ash and hydroxypropyl methyl cellulose by a mixer, adding the mixture into an electric arc furnace by using a spiral feeder, melting the mixture for 90 minutes by using a long electric arc, stopping melting after power failure, introducing oxygen into the molten feed liquid by using an oxygen lance, and decarbonizing and oxidizing the feed liquid to obtain feed liquid 1;
the decarbonizationThe flow rate of the oxidizing oxygen was 14m3H, the time is 5.5 min;
s3: adding rare earth and andalusite powder into the electric arc furnace in the step S2, melting for 40 minutes by long electric arc, stopping melting after power failure, introducing oxygen into the melted feed liquid by using an oxygen lance, and decarbonizing and oxidizing the feed liquid to obtain feed liquid 2;
the flow rate of the decarbonization and oxidation oxygen is 14m3H, the time is 5.5 min;
s4: and (4) tilting the electric arc furnace, pouring the feed liquid 2 obtained in the step S3 into the buried sand mold, carrying out heat preservation annealing for 15 days, taking the product out of the heat preservation box, removing the sand mold to obtain a blank product, and cutting and grinding the blank product to obtain the required finished product.
The rate of pouring the feed liquid 2 into the sand mold in the step S4 was 26 kg/S.
The heat preservation annealing rate in the step S4 is 40 ℃/h, and the temperature is reduced to 50 ℃.
The electric current of the electric arc furnace in the preparation step is 5700A, and the voltage is 340V.
Example 3
An erosion-resistant electric melting zirconia-corundum brick for a glass kiln comprises the following components in percentage by mass: 41.9 percent of zircon sand, 49.4 percent of alumina powder, 2.0 percent of soda ash, 4.6 percent of zirconia, 0.4 percent of rare earth, 0.6 percent of andalusite powder and 1.1 percent of hydroxypropyl methyl cellulose.
The preparation method comprises the following steps:
s1: adopting a computer 3D modeling sub-diagram to assign a die diagram of a product, making a model by a foam cutting machine in a model workshop according to the drawing, and making a sand mold by sand casting in a sand mold workshop through the model; the sand mould adopts a self-hardening sand process to reasonably produce blank processing amount, the casting workshop puts the sand mould into a special heat preservation box, fills the hollow silicon-aluminum ball heat preservation material, and then compacts the heat preservation material through a vibrator to wait for casting;
s2: uniformly mixing zircon sand, alumina powder, zirconia, soda ash and hydroxypropyl methyl cellulose by a mixer, adding the mixture into an electric arc furnace by using a spiral feeder, melting the mixture by using a long electric arc for 80 minutes, stopping melting after power failure, introducing oxygen into the molten feed liquid by using an oxygen lance, and decarbonizing and oxidizing the feed liquid to obtain feed liquid 1;
the flow rate of the decarbonization and oxidation oxygen is 13m3H, the time is 4 min;
s3: adding rare earth and andalusite powder into the electric arc furnace in the step S2, melting for 30 minutes by long electric arc, stopping melting after power failure, introducing oxygen into the melted feed liquid by using an oxygen lance, and decarbonizing and oxidizing the feed liquid to obtain feed liquid 2;
the flow rate of the decarbonization and oxidation oxygen is 13m3H, the time is 4 min;
s4: and (4) tilting the electric arc furnace, pouring the feed liquid 2 obtained in the step S3 into the buried sand mold, carrying out heat preservation annealing for 13 days, taking the product out of the heat preservation box, removing the sand mold to obtain a blank product, and cutting and grinding the blank product to obtain the required finished product.
The rate of pouring the feed liquid 2 into the sand mold in the step S4 is 24 kg/S.
The holding annealing rate in the step S4 is 35 ℃/h, and the temperature is reduced to 50 ℃.
The electric current of the electric arc furnace in the preparation step is 5700A, and the voltage is 340V.
Comparative example 1
The comparative example 1 was prepared similarly to example 3 except that no andalusite powder and hydroxypropyl methylcellulose were contained and the corresponding rare earth content was increased, as compared to example 3.
Comparative example 2
The comparative example 2 was prepared similarly to example 3 except that it did not contain andalusite powder and rare earth and the content of hydroxypropyl methylcellulose was increased accordingly, as compared to example 3.
Comparative example 3
The comparative example 3 was prepared similarly to example 3 except that hydroxypropyl methylcellulose and rare earth were not contained and the content of andalusite powder was increased correspondingly from example 3.
Comparative example 4
The comparative example 4 was prepared similarly to example 3 except that hydroxypropylmethylcellulose was replaced with methylcellulose.
Comparative example 5
The comparative example 5 was prepared similarly to example 3 except that the andalusite powder was replaced with kyanite powder.
Comparative example 6
The preparation method of comparative example 6 is similar to that of example 3, and differs from example 3 in that rare earth is 0.75%, andalusite powder is 0.15%, and hydroxypropyl methyl cellulose is 1.2%.
Comparative example 7
The comparative example 7 was prepared similarly to example 3 except that the decarbonization and oxidation operation was not performed in step S2 and the oxygen supply time was 8min in step S3; and all the raw materials are added in step S2.
Comparative example 8
The comparative example 8 was prepared similarly to example 3 except that the soak annealing rate in step S4 was 50 c and the temperature was decreased to 60 c.
Test example I, Performance test of fused zirconia-corundum brick
1. Test subjects: fused zirconia-corundum bricks prepared in examples 1-3 and comparative examples 1-8
2. The test method comprises the following steps: the Chinese building material industry standards 'fused cast zirconia corundum refractory products for glass melting furnaces' (JC493-2001) and GB/T2997-2015.
3. And (3) test results:
the test results are shown in table 1:
TABLE 1 Properties of fused zirconia-corundum bricks obtained in examples 1 to 3 and comparative examples 1 to 8
As can be seen from Table 1: compared with the control group, the fused zirconia corundum bricks of the group of the example 1, the group of the example 2 and the group of the example 3 have more excellent performance, wherein the group of the example 3 has the best effect, and the overall effect is better than that of the control group, and is the best example of the invention. The test results of the comparative example group and the example group show that the rare earth, the andalusite powder and the hydroxyl provided by the inventionThe propyl methyl cellulose has obvious synergistic effect and can reduce the occurrence of pores to a great extent, thereby reducing the content of Na2The alkaline glass liquid of O invades into the brick along the air holes and cracks of the brick body, and diffuses and mutually permeates with the precipitated glass phase, so that the erosion behavior is aggravated, and the erosion resistance is improved.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. The erosion-resistant electric melting zirconia-corundum brick for the glass kiln is characterized by comprising the following components in percentage by mass: 41.0-43.0% of zircon sand, 48.0-51.0% of alumina powder, 1.4-2.0% of soda ash, 3.8-5.9% of zirconia, 0.2-0.7% of rare earth, 0.2-0.8% of andalusite powder and 0.4-1.6% of hydroxypropyl methyl cellulose;
the preparation method comprises the following steps:
s1: adopting a computer 3D modeling sub-diagram to assign a die diagram of a product, making a model by a foam cutting machine in a model workshop according to the drawing, and making a sand mold by sand casting in a sand mold workshop through the model; the sand mould adopts a self-hardening sand process to reasonably produce blank processing amount, the casting workshop puts the sand mould into a special heat preservation box, fills the hollow silicon-aluminum ball heat preservation material, and then compacts the heat preservation material through a vibrator to wait for casting;
s2: uniformly mixing zircon sand, alumina powder, zirconia, soda ash and hydroxypropyl methyl cellulose by a mixer, adding the mixture into an electric arc furnace by using a spiral feeder, melting the mixture by long electric arc for 60 to 90 minutes, stopping melting after power failure, introducing oxygen into the molten feed liquid by using an oxygen lance, decarbonizing and oxidizing the feed liquid to obtain feed liquid 1;
s3: adding rare earth and andalusite powder into the electric arc furnace in the step S2, melting for 20-40 minutes by long electric arc, stopping melting after power failure, introducing oxygen into the melted feed liquid by using an oxygen lance, and decarbonizing and oxidizing the feed liquid to obtain feed liquid 2;
s4: and (4) tilting the electric arc furnace, pouring the feed liquid 2 obtained in the step S3 into the buried sand mold, carrying out heat preservation annealing for 10-15 days, taking the product out of the heat preservation box, removing the sand mold to obtain a blank product, and cutting and grinding the blank product to obtain the required finished product.
2. The erosion-resistant electric melting zirconia-corundum brick for the glass kiln according to claim 1, which is characterized by comprising the following components in percentage by mass: 41.9 percent of zircon sand, 49.4 percent of alumina powder, 2.0 percent of soda ash, 4.6 percent of zirconia, 0.4 percent of rare earth, 0.6 percent of andalusite powder and 1.1 percent of hydroxypropyl methyl cellulose.
3. The erosion-resistant electrofused zirconia-corundum bricks for glass furnaces according to claim 1, wherein in the preparation step the electric current of the electric arc furnace is 5700A and the voltage is 340V.
4. The erosion-resistant fused zirconia-corundum bricks for glass furnaces according to claim 1, wherein the decarbonization and oxygen oxidation flow rate in step S3 is 10 to 14m3The time is 3.5-5.5 min.
5. The erosion-resistant fused zirconia corundum bricks for glass furnaces according to claim 1, wherein the speed of pouring the feed liquid 2 into the sand mold in the step S4 is 20 to 26 kg/S.
6. The erosion-resistant fused zirconia corundum bricks for glass furnaces according to claim 1, wherein the heat-insulating annealing rate in step S4 is 10-40 ℃/h, and the temperature is reduced to 50 ℃.
7. An erosion-resistant fused zirconia-corundum brick for a glass kiln according to any one of claims 1 to 6.
8. Use of an erosion resistant fused zirconia corundum block for a glass furnace according to claim 7 in the manufacture of a glass furnace.
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