Chromic zirconium corundum refractory material, method for preparing the same, and chromic zirconium corundum brick

Abstract

The application relates to a chromium-zirconium corundum refractory material, a preparation method thereof and a chromium-zirconium corundum brick. The chromium-zirconium corundum refractory material comprises raw materials in the following mass fractions: synthetic chromium corundum powder, fused zirconium mullite powder, first chromium oxide powder, first aluminum oxide powder and first binding agent; the synthetic chromium corundum powder comprises raw materials in the following mass fractions: second chromium oxide powder, second aluminum oxide powder and second binding agent; the synthetic chromium corundum powder comprises first synthetic chromium corundum powder, second synthetic chromium corundum powder, third synthetic chromium corundum powder and fourth synthetic chromium corundum powder; the fused zirconium mullite powder comprises first fused zirconium mullite powder and second fused zirconium mullite powder; and the mass fraction of Cr2O3 in the chromium-zirconium corundum refractory material is 30%-35%. The chromium-zirconium corundum refractory material has the advantages of high porosity, high high-temperature structural strength, low high-temperature creep rate, strong chemical corrosion resistance and good thermal shock resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refractory materials, in particular to a chromium-zirconium corundum refractory material, a preparation method thereof and a chromium-zirconium corundum brick. BACKGROUND

[0002] Chromium-zirconium corundum (Al2O3-Cr2O3 system) refractory material is widely used in the regenerator and wall of glass melting furnace, lead-zinc non-ferrous smelting furnace, waste melting furnace, smelting reduction iron-making furnace, carbon black reaction furnace, coal water slurry gasification furnace and other parts with strong slag action due to its high compressive strength, bending strength, acid and alkali corrosion resistance and chemical corrosion resistance to metal oxides, and the service temperature can reach 1800℃.

[0003] As a hot face lining material, it has higher requirements for the thermal shock resistance of chromium-zirconium corundum refractory material due to its high service environment temperature (1300℃-1600℃) and large temperature fluctuation during start-stop and maintenance. However, the traditional chromium-zirconium corundum refractory material is difficult to achieve stable and excellent thermal shock resistance while ensuring good corrosion resistance, and is not suitable for application scenarios with large temperature changes and parts of the furnace with large temperature difference between the inside and outside. SUMMARY

[0004] Therefore, it is necessary to provide a chromium-zirconium corundum refractory material, a preparation method thereof and a chromium-zirconium corundum brick to solve the problem that the traditional chromium-zirconium corundum refractory material is difficult to achieve stable and excellent thermal shock resistance while ensuring good corrosion resistance.

[0005] The above-mentioned purpose of the present application is achieved by the following technical solutions:

[0006] In a first aspect, the present application provides a chromium-zirconium corundum refractory material, which comprises the following raw materials by mass: 50-80 parts of synthetic chromium corundum powder, 6-16 parts of fused zirconium mullite powder, 15-25 parts of first chromium oxide powder, 6-12 parts of first aluminum oxide powder and 3-5 parts of first binding agent.

[0007] The synthetic chromium corundum powder comprises the following raw materials by mass: 35-45 parts of second chromium oxide powder, 55-65 parts of second aluminum oxide powder and 1-3 parts of second binding agent.

[0008] The synthetic chromium corundum powder comprises first synthetic chromium corundum powder with a particle size of 6-8 mesh, second synthetic chromium corundum powder with a particle size of 8-16 mesh, third synthetic chromium corundum powder with a particle size of 16-40 mesh and fourth synthetic chromium corundum powder with a particle size of ≥40 mesh.

[0009] The fused zirconium mullite powder comprises first fused zirconium mullite powder with a particle size of 1.5-3 mm and second fused zirconium mullite powder with a particle size of 0.7-1.5 mm.

[0010] The mass fraction of Cr2O3 in the chrome zirconia corundum refractory material is 30% to 35%.

[0011] In one of the embodiments, the synthetic chrome corundum powder comprises the following components in mass parts: 10 to 15 parts of the first synthetic chrome corundum powder, 10 to 20 parts of the second synthetic chrome corundum powder, 10 to 15 parts of the third synthetic chrome corundum powder, and 20 to 30 parts of the fourth synthetic chrome corundum powder.

[0012] In one of the embodiments, the synthetic chrome corundum powder contains the following components in mass fractions: 30% to 35% of Cr2O3, ≥58% of Al2O3, <5% of ZrO2, and ≤1% of TiO2.

[0013] In one of the embodiments, the electrically fused zirconia mullite powder comprises the following components in mass parts: 3 to 8 parts of the first electrically fused zirconia mullite powder and 3 to 8 parts of the second electrically fused zirconia mullite powder.

[0014] In one of the embodiments, the electrically fused zirconia mullite powder contains the following components in mass fractions: ≥37% of ZrO2, 40% to 43% of Al2O3, and 15% to 18% of SiO2.

[0015] In one of the embodiments, the D50 particle size of the first chromium oxide powder and the second chromium oxide powder is independently 10 μm to 15 μm.

[0016] In one of the embodiments, the mass fraction of Cr2O3 in the first chromium oxide powder is 80% to 85%.

[0017] In one of the embodiments, the mass fraction of Cr2O3 in the second chromium oxide powder is 70% to 80%.

[0018] In one of the embodiments, the first aluminum oxide powder comprises aluminum oxide micropowder with a D50 particle size of 2 μm and aluminum oxide spherical powder with a D50 particle size of 10 μm to 15 μm.

[0019] In one of the embodiments, the second aluminum oxide powder comprises aluminum oxide spherical powder with a D50 particle size of 10 μm to 15 μm.

[0020] In one of the embodiments, the mass fraction of Al2O3 in the first aluminum oxide powder and the mass fraction of Al2O3 in the second aluminum oxide powder are independently >98.5%.

[0021] In one of the embodiments, the first binding agent and the second binding agent independently comprise one or more of a solid binding agent and a liquid binding agent.

[0022] The solid binding agent comprises one or more of peach gum, gum, dextrin, lignin, lignin sulfonate, orthophosphate, condensed phosphate, and carboxymethyl cellulose salt.

[0023] The liquid binding agent comprises one or more of pulp solution, polyvinyl alcohol solution, silica sol, and water glass.

[0024] In a second aspect of the present application, a preparation method of the chromium-zirconium corundum refractory material is provided, comprising the following steps:

[0025] Preparation of a molding material containing synthetic chromium corundum powder, fused zirconium mullite powder, first chromium oxide powder, first aluminum oxide powder, and first binding agent;

[0026] Isostatic pressing forming treatment is performed on the molding material to obtain a green body;

[0027] First firing treatment is performed on the green body to obtain the chromium-zirconium corundum refractory material.

[0028] In one embodiment, the first binding agent comprises a solid binding agent and a liquid binding agent.

[0029] The preparation method of the molding material comprises the following steps:

[0030] Mixing the first chromium oxide powder, the first aluminum oxide powder, and the solid binding agent to obtain a powder material;

[0031] Mixing the powder material, the synthetic chromium corundum powder, the fused zirconium mullite powder, and the liquid binding agent to obtain a first mixed material;

[0032] Drying treatment and air-drying treatment are performed on the first mixed material to obtain the molding material.

[0033] In one embodiment, the preparation method of the synthetic chromium corundum powder comprises the following steps:

[0034] Mixing second chromium oxide powder, second aluminum oxide powder, and second binding agent to obtain a second mixed material;

[0035] Stirring mill treatment and sand mill treatment are performed on the second mixed material to obtain a slurry;

[0036] Pressure filtration treatment and clay forming treatment are performed on the slurry to obtain a clay blank;

[0037] Second firing treatment and crushing treatment are performed on the clay blank to obtain the synthetic chromium corundum powder.

[0038] In a third aspect of the present application, a chromium-zirconium corundum brick is provided, which is made of the chromium-zirconium corundum refractory material as described above.

[0039] The application has at least the following beneficial effects:

[0040] The application uses a certain proportion of second chromium oxide powder and second aluminum oxide powder to make synthetic chromium corundum powder, and cooperates with raw materials such as fused zirconium mullite powder, first chromium oxide powder and first aluminum oxide powder in a specific proportion, controls the Cr2O3 content of the refractory material in the range of 30% to 35%, and makes it have excellent chemical corrosion resistance. At the same time, the fused zirconium mullite powder has a unique eutectic structure, and has good high-temperature mechanical properties, high-temperature thermal properties, uniform thermal expansion, good thermal shock resistance, excellent glass liquid corrosion resistance and other characteristics, effectively improving the corrosion resistance and thermal shock resistance of the refractory material. At the same time, the use of four different particle sizes of synthetic chromium corundum powder and two different particle sizes of fused zirconium mullite powder can realize the grading of large and small particles, optimize the pore distribution and improve the porosity of the particle material, thereby improving the thermal shock resistance of the refractory material. Therefore, the chromium-zirconium corundum refractory material provided by the application has the advantages of high porosity, high high-temperature structural strength, low high-temperature creep rate, strong chemical corrosion resistance and good thermal shock resistance, and is suitable for glass kiln structures with relatively large temperature deviation and high requirements for thermal shock resistance. DETAILED DESCRIPTION

[0041] In order to facilitate the understanding of the present application, the present application will be further described in detail below in combination with specific embodiments. However, the present application can be realized in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0043] In the present application, the meaning of "and / or" is any and all combinations of one or more related listed items. The meaning of "at least one" is more than one, such as one, two, and more than two. The meaning of "multiple" or "several" is at least two, such as two, three, etc. The meaning of "multiple layers" is at least two layers, such as two layers, three layers, etc., unless otherwise specifically defined. In the description of the present application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise specifically defined.

[0044] When a range of values is disclosed herein, it is understood that the range is inclusive of the minimum and maximum values, and each intervening value by the same unit between the minimum and the maximum. Further, it is understood that the range is inclusive of each integer within the range, unless otherwise indicated. Furthermore, where a range of values is provided, it is understood that each intervening value, to the tenth of the unit of the lower limit unless otherwise indicated, along with each value or integer per unit in the lower limit, is also contended. Also, it is understood that the various ranges disclosed are not to be construed as being bound by the same.

[0045] Unless otherwise indicated, all steps of the application can be performed in any order. For example, the method comprises steps (a) and (b) means that the method can comprise steps (a) and (b) performed in sequence, or steps (b) and (a) performed in sequence. For example, the method is mentioned to further comprise step (c) means that step (c) can be added to the method in any order. For example, the method can comprise steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), etc.

[0046] In the present application, "above" or "below" includes the number itself. For example, 1 below includes 1.

[0047] In the present application, the temperature parameters, unless otherwise specified, allow both constant temperature treatment and fluctuations within a certain temperature range. It should be understood that the constant temperature treatment allows fluctuations within the accuracy range controlled by the instrument. Fluctuations within a range of, for example, ±5°C, ±4°C, ±3°C, ±2°C, ±1°C are allowed.

[0048] In the present application, room temperature refers to indoor temperature, normal temperature or general temperature. Generally, the range of room temperature can be any of the following temperature ranges: 23°C ± 2°C, 25°C ± 5°C or 20°C ± 5°C.

[0049] Chromic zirconia corundum brick, also known as chromium corundum brick, is a refractory material with a Cr2O3 content of 1% to 60% (mass fraction), and its main mineral composition is α-Al2O3-Cr2O3 solid solution, and the secondary mineral composition is a small amount of composite spinel or no composite spinel. Chromic zirconia corundum brick has two types: fused chromic zirconia corundum brick and sintered chromic zirconia corundum brick. Generally, chromic zirconia corundum brick refers to sintered chromium corundum brick. The Cr2O3 content of sintered chromic zirconia corundum brick is usually lower than that of fused chromic zirconia corundum brick.

[0050] The preparation methods of the sintered chrome zirconia corundum brick mainly include the following two kinds: one is to use α-Al2O3 powder as raw material, add appropriate amount of chromium oxide powder and chrome corundum clinker fine powder, and then sinter at high temperature after shaping; the other is to use slurry casting method to prepare, uniformly mix α-Al2O3 powder and chromium oxide powder, add a small amount of deflocculant and organic binder to make thick slurry, and add part of chrome corundum clinker, and then use grouting method to make green brick, and finally sinter at high temperature. The sintered chrome zirconia corundum brick can be used as the lining of glass melting furnace, cover plate brick of glass flow liquid hole in wire drawing, and back lining of hot metal pretreatment device, waste incinerator and coal slurry pressurized gasification furnace.

[0051] In the glass melting furnace, the corrosion resistance of the refractory material is crucial. However, the content of Cr2O3 in the chrome zirconia corundum refractory material is positively correlated with its corrosion resistance, but the greater the content of Cr2O3, the worse the thermal shock resistance will be, which is difficult to realize stable and excellent thermal shock resistance while ensuring good corrosion resistance.

[0052] The first aspect of the present application provides a chrome zirconia corundum refractory material and a preparation method thereof and a chrome zirconia corundum brick, to solve the problem that the traditional chrome zirconia corundum refractory material is difficult to realize stable and excellent thermal shock resistance while ensuring good corrosion resistance.

[0053] In some embodiments, the chrome zirconia corundum refractory material comprises the following raw materials by mass fraction: 50-80 parts of synthetic chrome corundum powder, 6-16 parts of fused zirconia mullite powder, 15-25 parts of first chromium oxide powder, 6-12 parts of first aluminum oxide powder, and 3-5 parts of first binder;

[0054] The synthetic chrome corundum powder comprises the following raw materials by mass fraction: 35-45 parts of second chromium oxide powder, 55-65 parts of second aluminum oxide powder, and 1-3 parts of second binder;

[0055] The synthetic chrome corundum powder comprises first synthetic chrome corundum powder with a particle size of 6-8 mesh, second synthetic chrome corundum powder with a particle size of 8-16 mesh, third synthetic chrome corundum powder with a particle size of 16-40 mesh, and fourth synthetic chrome corundum powder with a particle size of ≥40 mesh;

[0056] The fused zirconia mullite powder comprises first fused zirconia mullite powder with a particle size of 1.5-3 mm and second fused zirconia mullite powder with a particle size of 0.7-1.5 mm;

[0057] The mass fraction of Cr2O3 in the chrome zirconia corundum refractory material is 30%-35%.

[0058] For chrome zirconium corundum refractory, the influencing factors of its corrosion resistance and thermal shock resistance are various, mainly including two factors of action conditions (such as temperature, temperature difference and time, etc.) and material quality (such as chemical composition and microstructure). Under the same action conditions, the chemical composition (such as Cr2O3 content) and microstructure (such as the size and distribution of porosity) of the material quality are mainly considered.

[0059] In terms of chemical composition, the crystalline body of Cr2O3 is extremely hard, with a density of 5.21 g / cm 3 and a melting point of 2266℃, so it can effectively improve the refractoriness of the refractory; Cr2O3 and Al2O3 can form an Al2O3-Cr2O3 continuous solid solution to improve the corrosion resistance of the refractory; generally speaking, the higher the Cr2O3 content, the better the corrosion resistance of the refractory, but the worse the thermal shock resistance.

[0060] In terms of porosity: the refractory is usually composed of powder matrix and granular aggregate; the powder matrix has high apparent porosity, weak corrosion resistance and strong thermal shock resistance; the granular aggregate has a dense and complete single crystal or polycrystalline structure, strong corrosion resistance and weak thermal shock resistance.

[0061] It is reported that chrome corundum material is obtained by arc furnace smelting, and then chrome zirconium corundum refractory is prepared, but it has the following problems: the porosity of the chrome zirconium corundum refractory is 8%-15%, which is relatively low, resulting in a loss of thermal shock resistance; the Cr2O3 content of the chrome zirconium corundum refractory is 6%-23%, which will reduce the corrosion resistance; the preparation cost of the chrome corundum material prepared by the electric melting method is greatly improved.

[0062] In view of the above findings, the second chromium oxide powder and the second aluminum oxide powder are used to prepare synthetic chrome corundum powder, and the first chromium oxide powder, the first aluminum oxide powder and the electrically fused zirconium mullite powder are used to cooperate with each other in a specific ratio, so that the Cr2O3 content of the refractory is controlled within the range of 30%-35%, so that the refractory has excellent chemical corrosion resistance. At the same time, the electrically fused zirconium mullite powder has a unique eutectic structure, as well as good high-temperature mechanical properties, high-temperature thermal properties, uniform thermal expansion, good thermal shock resistance and excellent glass liquid corrosion resistance, which effectively improves the corrosion resistance and thermal shock resistance of the refractory. At the same time, the four different particle sizes of the synthetic chrome corundum powder and the two different particle sizes of the electrically fused zirconium mullite powder are used to cooperate with each other, so that the size grading of the particles can be realized, the pore distribution can be optimized and the porosity of the granular material can be improved, so that the thermal shock resistance of the refractory can be improved. Therefore, the chrome zirconium corundum refractory provided by the application has the advantages of high porosity, high high-temperature structural strength, low high-temperature creep rate, strong chemical corrosion resistance and good thermal shock resistance, and is suitable for glass furnace structures with relatively large temperature deviation and high thermal shock resistance requirements.

[0063] As an example, in the raw material of the chrome zirconia corundum refractory, the mass fraction of the synthetic chrome corundum powder is 50 parts to 80 parts, for example 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, 62 parts, 65 parts, 68 parts, 70 parts, 72 parts, 75 parts, 78 parts or 80 parts, and further optionally 60 parts to 70 parts; the mass fraction of the fused zirconia mullite powder is 6 parts to 16 parts, for example 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts or 16 parts, and further optionally 6 parts to 10 parts; the mass fraction of the first chromium oxide powder is 15 parts to 25 parts, for example 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts or 25 parts, and further optionally 16 parts to 20 parts; the mass fraction of the first alumina powder is 6 parts to 12 parts, for example 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts or 12 parts, and further optionally 10 parts to 12 parts; the mass fraction of the first binding agent is 3 parts to 5 parts, for example 3 parts, 3.2 parts, 3.5 parts, 3.8 parts, 4 parts, 4.2 parts, 4.5 parts, 4.8 parts or 5 parts, and further optionally 3.5 parts to 4 parts.

[0064] As an example, in the raw material of the synthetic chrome corundum powder, the mass fraction of the second chromium oxide powder is 35 parts to 45 parts, for example 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, 41 parts, 42 parts, 43 parts, 44 parts or 45 parts, and further optionally 38 parts to 42 parts; the mass fraction of the second alumina powder is 55 parts to 65 parts, for example 55 parts, 56 parts, 57 parts, 58 parts, 59 parts, 60 parts, 61 parts, 62 parts, 63 parts, 64 parts or 65 parts, and further optionally 58 parts to 62 parts; the mass fraction of the second binding agent is 1 part to 3 parts, for example 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts or 3 parts, and further optionally 2 parts.

[0065] As an example, in the components of the synthetic chrome corundum powder, the particle size of the first synthetic chrome corundum powder is 6 mesh to 8 mesh (i.e. 1875 μm to 2500 μm), for example 6 mesh, 6.5 mesh, 7 mesh, 7.5 mesh or 8 mesh; the particle size of the second synthetic chrome corundum powder is 8 mesh to 16 mesh (i.e. 937.5 μm to 1875 μm), for example 8 mesh, 9 mesh, 10 mesh, 11 mesh, 12 mesh, 13 mesh, 14 mesh, 15 mesh or 16 mesh; the particle size of the third synthetic chrome corundum powder is 16 mesh to 40 mesh (i.e. 375 μm to 937.5 μm), for example 16 mesh, 18 mesh, 20 mesh, 22 mesh, 24 mesh, 26 mesh, 28 mesh, 30 mesh, 32 mesh, 34 mesh, 36 mesh, 38 mesh or 40 mesh; the particle size of the fourth synthetic chrome corundum powder is ≥40 mesh (i.e. ≤375 μm), for example 40 mesh, 50 mesh, 60 mesh, 70 mesh, 80 mesh, 90 mesh, 100 mesh, 150 mesh, 200 mesh or 325 mesh.

[0066] Optionally, the synthetic chrome corundum powder comprises the following components by mass fraction: 10-15 parts of the first synthetic chrome corundum powder, 10-20 parts of the second synthetic chrome corundum powder, 10-15 parts of the third synthetic chrome corundum powder, and 20-30 parts of the fourth synthetic chrome corundum powder.

[0067] For example, in the components of the synthetic chrome corundum powder, the first synthetic chrome corundum powder has a mass fraction of 10-15 parts, for example, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts, and further optionally 10-12 parts; the second synthetic chrome corundum powder has a mass fraction of 10-20 parts, for example, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, or 20 parts, and further optionally 12-16 parts; the third synthetic chrome corundum powder has a mass fraction of 10-15 parts, for example, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts, and further optionally 10-12 parts; and the fourth synthetic chrome corundum powder has a mass fraction of 20-30 parts, for example, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, or 30 parts, and further optionally 27-30 parts.

[0068] By adjusting the amount of the four synthetic chrome corundum powders with different particle sizes, the size of the synthetic chrome corundum powder particles can be reasonably matched, the size and distribution uniformity of the pores can be optimized, and thus the refractory material has higher porosity and better thermal shock resistance.

[0069] Optionally, the synthetic chrome corundum powder contains the following components by mass fraction: 30%-35% of Cr2O3, ≥58% of Al2O3, <5% of ZrO2, and ≤1% of TiO2.

[0070] By controlling the Cr2O3 content and Al2O3 content in the synthetic chrome corundum powder, and combining the ratio of the synthetic chrome corundum powder and other raw materials, the Cr2O3 content in the refractory material can be accurately adjusted, so that the refractory material has stable and excellent chemical corrosion resistance.

[0071] For example, in the fused zirconium mullite powder, the particle size of the first fused zirconium mullite powder is 1.5-3 mm, for example, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, or 3 mm; and the particle size of the second fused zirconium mullite powder is 0.7-1.5 mm, for example, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, or 1.5 mm.

[0072] Optionally, the electrically fused zirconia mullite powder comprises the following components in the following mass fractions: 3-8 parts of the first electrically fused zirconia mullite powder and 3-8 parts of the second electrically fused zirconia mullite powder.

[0073] For example, in the components of the electrically fused zirconia mullite powder, the mass fraction of the first electrically fused zirconia mullite powder is 3-8 parts, for example, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts or 8 parts, and further optionally 3-5 parts; the mass fraction of the second electrically fused zirconia mullite powder is 3-8 parts, for example, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts or 8 parts, and further optionally 3-5 parts.

[0074] By controlling the amount of the two electrically fused zirconia mullite powders with different particle sizes, the size of the electrically fused zirconia mullite powder can be reasonably matched, the size and uniformity of the pores can be optimized, and thus the refractory material has higher porosity and better thermal shock resistance.

[0075] Optionally, the electrically fused zirconia mullite powder comprises the following components in the following mass fractions: ZrO2 ≥ 37%, Al2O3 40%-43% and SiO2 15%-18%.

[0076] By controlling the content of ZrO2 and Al2O3 in the electrically fused zirconia mullite powder, and combining the ratio of the electrically fused zirconia mullite powder and other raw materials, the content of ZrO2 in the refractory material can be accurately controlled, and thus the refractory material has stable and excellent thermal shock resistance.

[0077] Optionally, the D50 particle size of the first chromium oxide powder and the second chromium oxide powder is independently 10-15 μm, for example, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm or 15 μm.

[0078] Optionally, the mass fraction of Cr2O3 in the first chromium oxide powder is 80%-85%, for example, 80%, 81%, 82%, 83%, 84% or 85%. Further optionally, the first chromium oxide powder is a chromium oxide ball powder, which comprises the following components in the following mass fractions: Cr2O3 80%-85%, Al2O3 ≥ 10%, ZrO2 < 5% and TiO2 ≤ 2%.

[0079] Optionally, the mass fraction of Cr2O3 in the second chromium oxide powder is 70%-80%, for example, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79% or 80%. Further optionally, the second chromium oxide powder is a chromium oxide mud, which comprises the following components in the following mass fractions: Cr2O3 70%-80%, Al2O3 ≥ 10%, ZrO2 < 10% and TiO2 ≤ 1.5%.

[0080] Optionally, the first alumina powder comprises alumina micropowder with a D50 particle size of 2 μm and alumina spherical powder with a D50 particle size of 10 μm to 15 μm.

[0081] Optionally, the second alumina powder comprises alumina spherical powder with a D50 particle size of 10 μm to 15 μm.

[0082] Optionally, the first alumina powder and the second alumina powder each independently comprise α-Al2O3 micropowder and tabular corundum spherical powder.

[0083] Optionally, the mass fraction of Al2O3 in the first alumina powder and the mass fraction of Al2O3 in the second alumina powder are each independently > 98.5%. Further optionally, the first alumina powder and the second alumina powder contain components with the following mass fractions: Al2O3 > 98.5% and SiO2 < 0.1%.

[0084] Optionally, the first binding agent and the second binding agent each independently comprise one or more of a solid binding agent and a liquid binding agent.

[0085] The solid binding agent comprises one or more of peach gum, gum, dextrin, lignin, lignosulfonate, orthophosphate, condensed phosphate, and carboxymethyl cellulose salt.

[0086] The liquid binding agent comprises one or more of pulp solution, polyvinyl alcohol solution, silica sol, and water glass.

[0087] It can be understood that the first binding agent and the second binding agent each can be in the form of solid and / or liquid and mixed with other raw materials. The solid binding agent and the liquid binding agent selected by the present application have good cold and hot binding strength, can cement different particle sizes of loose raw materials together, facilitate subsequent molding and high-temperature sintering, and are conducive to improving the strength and plasticity of the refractory material.

[0088] The lignosulfonate is an industrial raw material recovered and extracted from sulfite pulping and papermaking waste liquid, which can be sodium lignosulfonate, calcium lignosulfonate, or ammonium lignosulfonate. The orthophosphate can be used as a binding agent for neutral refractory materials and acidic refractory materials, and mainly includes dihydrogen phosphate and monohydrogen phosphate, for example, aluminum dihydrogen phosphate (Al (H2PO4)5, ADP). The carboxymethyl cellulose salt can be sodium carboxymethyl cellulose or potassium carboxymethyl cellulose.

[0089] As an example, the mass fraction of Cr2O3 in the chrome-zirconia corundum refractory material is 30% to 35%, for example, 30%, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, 34%, 34.5%, or 35%, and is further optionally 30% to 32.5%.

[0090] Optionally, the chromium zirconium corundum refractory material has a porosity of 15% to 18%, such as 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, or 18%, further optionally 15.8% to 17.4%.

[0091] Optionally, the chromium zirconium corundum refractory material has a bulk density of 3.4g / cm 3 ~3.5g / cm 3 , such as 3.4g / cm 3 , 3.41g / cm 3 , 3.42g / cm 3 , 3.43g / cm 3 , 3.44g / cm 3 , 3.45g / cm 3 , 3.46g / cm 3 , 3.47g / cm 3 , 3.48g / cm 3 , 3.49g / cm 3 or 3.5g / cm 3 , further optionally 3.41g / cm 3 ~3.46g / cm 3 .

[0092] Optionally, the chromium zirconium corundum refractory material has a thermal shock resistance of ≥30 times.

[0093] In a second aspect, the present application provides a preparation method of the chromium zirconium corundum refractory material as described above, comprising the following steps:

[0094] S100: preparing a molding material containing synthetic chromium corundum powder, fused zirconium mullite powder, first chromium oxide powder, first aluminum oxide powder, and first binding agent;

[0095] S200: performing isostatic pressing forming treatment on the molding material to obtain a green body;

[0096] S300: performing first firing treatment on the green body to obtain the chromium zirconium corundum refractory material.

[0097] Optionally, the first firing treatment is performed in a tunnel kiln; the firing temperature of the first firing treatment is 1610°C to 1630°C, such as 1610°C, 1615°C, 1620°C, 1625°C, or 1630°C; and the holding time of the first firing treatment is 10h to 12h, such as 10h, 10.5h, 11h, 11.5h, or 12h.

[0098] Optionally, the first binding agent comprises a solid binding agent and a liquid binding agent.

[0099] The preparation method of the molding material comprises the following steps:

[0100] S111: mixing the first chromium oxide powder, the first aluminum oxide powder and the solid binder to obtain a powder;

[0101] S112: mixing the powder, the synthetic chromium corundum powder, the fused zirconium mullite powder and the liquid binder to obtain a first mixture;

[0102] S113: performing drying treatment and cooling treatment on the first mixture to obtain a molding material.

[0103] Further optionally, the preparation method of the molding material comprises the following steps:

[0104] S111: putting the first chromium oxide powder, the first aluminum oxide powder and the solid binder into a conical mixer and mixing for 2h to obtain a powder;

[0105] S112: putting the synthetic chromium corundum powder and the fused zirconium mullite powder into a wet mill, adding the liquid binder, putting the powder after mixing for about 6min, and mixing for about 10min to obtain a first mixture with a water content of 1.0wt%~1.5wt.%;

[0106] S113: drying the first mixture to a water content of ≤0.48wt.% and placing to dry to room temperature or below to obtain a molding material.

[0107] Optionally, the preparation method of the synthetic chromium corundum powder comprises the following steps:

[0108] S121: mixing the second chromium oxide powder, the second aluminum oxide powder and the second binder to obtain a second mixture;

[0109] S122: performing stirring mill treatment and sand mill treatment on the second mixture to obtain a slurry;

[0110] S123: performing pressure filtration treatment and clay molding treatment on the slurry to obtain a clay blank;

[0111] S124: performing second firing treatment and crushing treatment on the clay blank to obtain a synthetic chromium corundum powder.

[0112] Optionally, the stirring mill treatment comprises the following steps: adding water in the second mixture, starting the stirring mill to mix the material, then starting the circulating pump, discharging and pumping the slurry to a slurry storage barrel, and adding an appropriate amount of water to flush the residual material in the pipeline to the slurry storage barrel to obtain a slurry.

[0113] Optionally, the sand mill treatment comprises the following steps: stirring the slurry in the slurry storage barrel uniformly, discharging the slurry to a sand mill, circulating the sand mill for 3~5 times, discharging to a slurry storage stirring tank to obtain a slurry with a D50 particle size of 2.0μm~3.5μm.

[0114] Optionally, the mud is subjected to pressure filtration treatment and mud shaping treatment, including the following steps: transferring the mud in the mud storage stirring tank to a pressure filter for pressure filtration treatment to obtain a mud cake; transferring the mud cake to a mud shaper for mud shaping treatment, and then placing it to dry to room temperature or below to obtain a green body.

[0115] Optionally, the second firing treatment is performed in a tunnel kiln; the firing temperature of the second firing treatment is 1620℃-1670℃, for example, 1620℃, 1630℃, 1640℃, 1650℃, 1660℃ or 1670℃; the holding time of the second firing treatment is 10h-12h, for example, 10h, 10.5h, 11h, 11.5h or 12h.

[0116] Optionally, the crushing treatment is performed by a crushing roller mill; after crushing, a screening treatment is performed to obtain synthetic chromium corundum powder of different particle sizes; after screening, an iron removal treatment can also be performed, so as to obtain synthetic chromium corundum powder meeting the composition requirements and particle size requirements.

[0117] The chromium-zirconium corundum refractory material provided in the present application can be smelted without using an electric arc furnace, but by pressing various raw materials into a shape and high-temperature sintering, which is beneficial to optimizing the pore distribution and increasing the porosity, thereby improving the thermal shock resistance of the refractory material, and also beneficial to reducing the preparation cost.

[0118] In a third aspect, the present application provides a chromium-zirconium corundum brick made of the chromium-zirconium corundum refractory material as described above.

[0119] It can be understood that the chromium-zirconium corundum brick material is made of the chromium-zirconium corundum refractory material as described above, which also has the advantages of high porosity, high high-temperature structural strength, low high-temperature creep rate, strong chemical corrosion resistance and good thermal shock resistance, and is suitable for use as a refractory brick for the regenerator and wall of a glass furnace, and is also suitable for use in a lead-zinc non-ferrous smelting furnace, a waste melting furnace, a smelting reduction ironmaking furnace, a carbon black reaction furnace, a coal water slurry gasification furnace and other parts with strong slag action.

[0120] The following will be further described in combination with specific examples and comparative examples. The raw materials involved in the following specific examples and comparative examples can be sourced from the market if not specifically stated, the instruments used can be sourced from the market if not specifically stated, and the processes involved are conventionally selected by those skilled in the art if not specifically stated. Among them, part of the raw materials are shown in Table 1:

[0121] Table 1. Raw materials in examples and comparative examples

[0122]

[0123] Note: (1) Chromium oxide ball powder: chromium oxide green and a-Al2O3 micro powder are mixed uniformly at a mass ratio of (80-85):(15-20), calcined at 1620°C in a tunnel kiln, and then ground to obtain the chromium oxide ball powder; (2) Chromium oxide body A and chromium oxide body B: leftover materials after processing commercially available products of Guangdong Xinlingnan Technology Co., Ltd. are dried and ground to obtain the chromium oxide body A and the chromium oxide body B.

[0124] Example 1

[0125] (1) Please refer to Table 2, the chromium-zirconia corundum refractory material of the present embodiment comprises the following raw materials by mass fraction: 62 parts of synthetic chromium corundum powder, 8 parts of fused zirconia mullite powder, 18 parts of first chromium oxide powder, 12 parts of first aluminum oxide powder, and 3.9 parts of first binder;

[0126] Synthetic chromium corundum powder: 10 parts of first synthetic chromium corundum powder, 14 parts of second synthetic chromium corundum powder, 10 parts of third synthetic chromium corundum powder, and 28 parts of fourth synthetic chromium corundum powder;

[0127] Fused zirconia mullite powder: 4 parts of first fused zirconia mullite powder and 4 parts of second fused zirconia mullite powder;

[0128] First chromium oxide powder: 18 parts of chromium oxide ball powder;

[0129] First aluminum oxide powder: 6 parts of a-Al2O3 micro powder and 6 parts of tabular corundum ball powder;

[0130] First binder: 1.5 parts of solid binder (peach gum powder) and 2.4 parts of liquid binder (polyvinyl alcohol aqueous solution).

[0131] (2) Please refer to Table 3, the synthetic chromium corundum powder comprises the following raw materials by mass fraction:

[0132] 42 parts of second chromium oxide powder, 58 parts of second aluminum oxide powder, and 2 parts of second binder; wherein the second chromium oxide powder is the chromium oxide body B, the second aluminum oxide powder is tabular corundum ball powder, and the second binder is selected from solid binders (dextrin powder).

[0133] (3) The preparation method of the chromium-zirconia corundum refractory material of the present embodiment is as follows:

[0134] (1) Preparation of synthetic chromium corundum powder:

[0135] Mix the second chromium oxide powder, the second aluminum oxide powder, and the second binder to obtain a second mixture;

[0136] Add water to the second mixture, start the stirring mill to mix the material, then start the circulating pump to discharge and pump the slurry to the slurry storage barrel, and add an appropriate amount of water to flush the residual material in the pipeline to the slurry storage barrel to obtain the slurry;

[0137] The slurry in the slurry storage tank is stirred uniformly, the slurry is discharged into the sand mill, and the sand mill is circulated for 3-5 times, and then the slurry is discharged into the slurry storage tank to obtain a slurry with a D50 particle size of 2.0-3.5 μm;

[0138] The slurry in the slurry storage tank is stirred uniformly, the slurry is discharged into the sand mill, and the sand mill is circulated for 3-5 times, and then the slurry is discharged into the slurry storage tank to obtain a slurry with a D50 particle size of 2.0-3.5 μm;

[0139] The slurry in the slurry storage tank is stirred uniformly, the slurry is discharged into the sand mill, and the sand mill is circulated for 3-5 times, and then the slurry is discharged into the slurry storage tank to obtain a slurry with a D50 particle size of 2.0-3.5 μm;

[0140] (2) Preparation of the shaped material: the first chromium oxide powder, the first aluminum oxide powder and the solid binder are put into the conical mixer for mixing for 2 h to obtain the powder; the synthetic chromium corundum powder and the fused zirconium mullite powder are put into the wet mill, the liquid binder is added, and after mixing for about 6 min, the powder is added, and after mixing for about 10 min, the first mixed material with a water content of 1.0-1.5 wt.% is obtained; the first mixed material is dried to a water content of ≤0.48 wt.%, and is placed to dry to room temperature or below to obtain the shaped material.

[0141] (3) Preparation of the green body: the shaped material is subjected to isostatic pressing forming treatment to obtain the green body;

[0142] (4) Preparation of the chromium-zirconium corundum brick: the green body is transferred to the tunnel kiln, and is fired at a firing temperature of 1620℃ for 16 h to obtain the chromium-zirconium corundum refractory material; after being taken out after cooling in the furnace, cutting and drilling are performed to obtain the chromium-zirconium corundum brick.

[0143] Examples 2 to 10

[0144] Examples 2-10 are basically the same as Example 1, except that:

[0145] Example 2: the first binder is selected to be solid binder (aluminum dihydrogen phosphate ADP) 1.5 parts and liquid binder (polyvinyl alcohol aqueous solution) 2.4 parts.

[0146] Example 3: the first binder is selected to be solid binder (peach gum powder) 1.5 parts and liquid binder (polyvinyl alcohol aqueous solution) 2.1 parts.

[0147] Example 4: the synthetic chromium corundum powder includes first synthetic chromium corundum powder 10 parts, second synthetic chromium corundum powder 14 parts, third synthetic chromium corundum powder 10 parts and fourth synthetic chromium corundum powder 26 parts, and the fused zirconium mullite powder includes first fused zirconium mullite powder 6 parts and second fused zirconium mullite powder 4 parts.

[0148] Example 5: The synthetic chrome corundum powder comprises 10 parts of the first synthetic chrome corundum powder, 16 parts of the second synthetic chrome corundum powder, 10 parts of the third synthetic chrome corundum powder, and 28 parts of the fourth synthetic chrome corundum powder, and the fused zirconia mullite powder comprises 2 parts of the first fused zirconia mullite powder and 4 parts of the second fused zirconia mullite powder.

[0149] Example 6: The synthetic chrome corundum powder comprises 14 parts of the first synthetic chrome corundum powder, 10 parts of the second synthetic chrome corundum powder, 14 parts of the third synthetic chrome corundum powder, and 24 parts of the fourth synthetic chrome corundum powder;

[0150] Example 7: The synthetic chrome corundum powder comprises 18 parts of the first synthetic chrome corundum powder, 12 parts of the second synthetic chrome corundum powder, 12 parts of the third synthetic chrome corundum powder, and 20 parts of the fourth synthetic chrome corundum powder;

[0151] Example 8: The synthetic chrome corundum powder comprises 12 parts of the first synthetic chrome corundum powder, and the fused zirconia mullite powder comprises 3 parts of the first fused zirconia mullite powder and 3 parts of the second fused zirconia mullite powder;

[0152] Example 9: The fused zirconia mullite powder comprises 8 parts of the first fused zirconia mullite powder and 8 parts of the second fused zirconia mullite powder;

[0153] Example 10: The synthetic chrome corundum powder comprises 38 parts of the second chromium oxide powder, 62 parts of the second alumina powder, and 2 parts of the second binding agent; wherein the second chromium oxide powder is the chromium oxide batch B, the second alumina powder is the tabular corundum ball powder, and the second binding agent is selected from the solid binding agent (dextrin powder).

[0154] Comparative Example 1

[0155] (1) Please refer to Table 2, the chrome zirconia corundum refractory material of the present comparative example comprises the following raw materials in mass parts: 62 parts of the synthetic chrome corundum powder, 8 parts of the fused zirconia mullite powder, 26.7 parts of the first chromium oxide powder, 3.3 parts of the first alumina powder, and 3.9 parts of the first binding agent;

[0156] The synthetic chrome corundum powder comprises 18 parts of the first synthetic chrome corundum powder, 10 parts of the second synthetic chrome corundum powder, 8 parts of the third synthetic chrome corundum powder, and 26 parts of the fourth synthetic chrome corundum powder;

[0157] The fused zirconia mullite powder comprises 8 parts of the first fused zirconia mullite powder;

[0158] The first chromium oxide powder comprises 19.5 parts of the chromium oxide batch A and 7.2 parts of the chromium oxide green;

[0159] The first alumina powder comprises 1.8 parts of the α-Al2O3 micropowder and 1.5 parts of the tabular corundum ball powder;

[0160] First bonding agent: solid bonding agent (peach gum powder) 1.5 parts and liquid bonding agent (polyvinyl alcohol aqueous solution) 2.4 parts.

[0161] (II) Formulation of the synthetic chrome corundum powder: same as Example 1.

[0162] (III) Method for preparing the chrome zirconia corundum brick: same as Example 1.

[0163] Comparative Example 2

[0164] (I) Please refer to Table 2, the chrome zirconia corundum refractory material of the present comparative example comprises the following raw materials by mass fraction: synthetic chrome corundum powder 67 parts, first chromium oxide powder 15.5 parts, first aluminum oxide powder 17.5 parts, and first bonding agent 3.7 parts;

[0165] Synthetic chrome corundum powder: first synthetic chrome corundum powder 10 parts, second synthetic chrome corundum powder 20 parts, third synthetic chrome corundum powder 13 parts, and fourth synthetic chrome corundum powder 24 parts;

[0166] First chromium oxide powder: chromium oxide spherical powder 15.5 parts;

[0167] First aluminum oxide powder: α-Al2O3micropowder 6.6 parts and tabular corundum spherical powder 10.9 parts;

[0168] First bonding agent: solid bonding agent (peach gum powder) 1.5 parts and liquid bonding agent (polyvinyl alcohol aqueous solution) 2.2 parts.

[0169] (II) Formulation of the synthetic chrome corundum powder: same as Example 1.

[0170] (III) Method for preparing the chrome zirconia corundum brick: same as Example 1.

[0171] Comparative Examples 3 to 6

[0172] Comparative Examples 3-4 are basically the same as Example 1, except that:

[0173] Comparative Example 3: the synthetic chrome corundum powder comprises first synthetic chrome corundum powder 31 parts and second synthetic chrome corundum powder 31 parts;

[0174] Comparative Example 4: the synthetic chrome corundum powder comprises third synthetic chrome corundum powder 31 parts and fourth synthetic chrome corundum powder 31 parts;

[0175] Comparative Example 5: the fused zirconia mullite powder is selected to be first fused zirconia mullite powder 8 parts;

[0176] Comparative Example 6: the fused zirconia mullite powder is selected to be second fused zirconia mullite powder 8 parts.

[0177] Test Example

[0178] The chromium zirconia corundum bricks of each embodiment and each comparative example were tested as follows, and the results are shown in Table 4.

[0179] (1) Cr2O3 content test: The test was performed according to GB / T 21114-2019 Refractory products - Chemical analysis by X-ray fluorescence spectrometry - Fusion of glass beads.

[0180] (2) Porosity and bulk density: The test was performed according to GB / T 2997-2015 Test method of bulk density, apparent porosity and true porosity of dense shaped refractory products.

[0181] (3) Thermal shock resistance: The number of thermal shock cycles experienced by the test sample when the heated end face was damaged by half was tested according to GB / T 30873-2014 Refractory products - Test method for thermal shock resistance. The more the number of thermal shock cycles, the better the thermal shock resistance. According to DIN 51068:2008 Testing of ceramic raw materials and basic materials - Determination of resistance to thermal shock - Water quenching method for refractory bricks, the number of thermal shock cycles at which visible cracks appeared in the electrode brick was tested using an electric furnace from Tianjin Scientific Instrument and Equipment Factory; the more the number of thermal shock cycles, the better the thermal shock resistance of the electrode brick.

[0182] (4) Glass liquid corrosion resistance test: According to JC / T 806-2013 Refractory materials for glass melting furnace - Static glass liquid corrosion resistance test method, chromium zirconia corundum bricks were made into strip samples for use, block-shaped test glass was added to the crucible, and the crucible was placed in a high-temperature electric furnace to heat the test glass to melt into glass liquid, then the chromium zirconia corundum strip sample was inserted into the test glass, and then the crucible was rotated; the corrosion test was carried out at 1570°C for 72h; after the test, the single-direction corrosion amount of the strip sample at the liquid surface and 1 / 2 below the liquid surface was measured using a Leica S6D stereomicroscope; the total corrosion amount and the unit total time were calculated to obtain the corrosion amount of the chromium zirconia corundum brick per unit time (mm / 24h); by comparing the unit corrosion amount, the excellent corrosion resistance can be obtained; wherein the test glass is microcrystalline glass (Wenzhou Kang'er Microcrystalline Glass Co., Ltd.); the flow rate of the glass liquid is 45m / h.

[0183] As can be seen from Table 4, the chromium zirconia corundum bricks of Examples 1-10 have an average Cr2O3 content of 30.42%-32.43%, an average porosity of 15.9%-18.4%, and an average bulk density of 3.39g / cm 3 ~3.45g / cm 3, the single direction erosion amount at the liquid level is ≤0.060 mm / 24h, and the single direction erosion amount at the 1 / 2 below the liquid level is ≤0.040 mm / 24h, which indicates that the introduction of the electrically fused zirconia mullite powder with different particle sizes and the synthetic chrome corundum powder with different particle sizes into the chrome zirconia corundum brick can effectively improve the thermal shock resistance of the product while maintaining good corrosion resistance, and a better effect can be achieved under a suitable particle size distribution, and the trace change in the particle composition has little effect on the thermal shock resistance. From Examples 5-6 and Examples 8-9, the increase in the amount of electrically fused zirconia mullite powder leads to an increase in the single direction erosion amount at the liquid level and at the 1 / 2 below the liquid level, which indicates that the introduction of the electrically fused zirconia mullite aggregate will sacrifice part of the corrosion resistance, and the corrosion resistance of the homogeneous chrome zirconia corundum brick with the same chromium content will be slightly worse, but the impact is not large.

[0184] In Comparative Example 2, no electrically fused zirconia mullite powder is added, and the thermal shock resistance is very poor. In Comparative Examples 1 and 5, only the first electrically fused zirconia mullite powder (1.5 mm-3 mm) is added, which leads to a decrease in the thermal shock resistance and the corrosion resistance; in Comparative Example 6, only the second electrically fused zirconia mullite powder (0.7 mm-1.5 mm) is added, which leads to a decrease in the thermal shock resistance; in Comparative Example 3, only the first synthetic chrome corundum powder (6 mesh-8 mesh) and the second synthetic chrome corundum powder (8 mesh-16 mesh) are added, and in Comparative Example 4, only the third synthetic chrome corundum powder (16 mesh-40 mesh) and the fourth synthetic chrome corundum powder (particle size ≥40 mesh) are added, which leads to a decrease in the thermal shock resistance and the corrosion resistance. It is proved that the selection of the electrically fused zirconia mullite powder and the synthetic chrome corundum powder with different particle sizes can form a particle size distribution effect, optimize the pore distribution, and improve the porosity, so as to improve the thermal shock resistance while maintaining good chemical corrosion resistance.

[0185] Table 2. Formulation of chrome zirconia corundum refractory (unit: mass parts)

[0186]

[0187] Table 3. Formulation of synthetic chrome corundum powder (unit: mass parts)

[0188]

[0189] Table 4. Performance of chrome zirconia corundum brick

[0190]

[0191] The technical features of the above-described embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0192] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of protection of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the scope of protection of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A chrome zirconia corundum refractory material, characterized in that, The synthetic chrome corundum powder comprises the following raw materials in mass parts: second chromium oxide powder 35 parts to 45 parts, second aluminum oxide powder 55 parts to 65 parts, and second binder 1 part to 3 parts. The synthetic chrome corundum powder comprises the following raw materials in mass parts: second chromium oxide powder 35 parts to 45 parts, second aluminum oxide powder 55 parts to 65 parts, and second binder 1 part to 3 parts. The synthetic chrome corundum powder comprises first synthetic chrome corundum powder with a particle size of 6 mesh to 8 mesh, second synthetic chrome corundum powder with a particle size of 8 mesh to 16 mesh, third synthetic chrome corundum powder with a particle size of 16 mesh to 40 mesh, and fourth synthetic chrome corundum powder with a particle size of ≥40 mesh. The preparation method of the synthetic chrome corundum powder comprises the following steps: The second chromium oxide powder, the second aluminum oxide powder, and the second binder are mixed to obtain a second mixture; The second mixture is subjected to stirring and grinding treatment and sanding treatment to obtain a slurry; The slurry is subjected to pressure filtration treatment and clay forming treatment to obtain a clay blank; The clay blank is subjected to second firing treatment and crushing treatment to obtain the synthetic chrome corundum powder; The electrically fused zirconium mullite powder comprises first electrically fused zirconium mullite powder with a particle size of 1.5 mm to 3 mm and second electrically fused zirconium mullite powder with a particle size of 0.7 mm to 1.5 mm, and the electrically fused zirconium mullite powder comprises two kinds of electrically fused zirconium mullite powder with different particle sizes; The electrically fused zirconium mullite powder contains the following components in mass parts: first electrically fused zirconium mullite powder 3 parts to 5 parts and second electrically fused zirconium mullite powder 3 parts to 5 parts. The electrically fused zirconium mullite powder contains the following components in mass fraction: ZrO2 ≥37%, Al2O3 40% to 43%, and SiO2 15% to 18%. The mass fraction of Cr2O3 in the chrome-zirconium corundum refractory material is 30% to 35%.

2. The chrome zirconia alumina refractory material of claim 1, wherein, The synthetic chrome corundum powder contains the following components in mass fraction: Cr2O3 30% to 35%, Al2O3 ≥58%, ZrO2 <5%, and TiO2 ≤1%.

3. The chrome zirconia alumina refractory material of claim 2, wherein, The D50 particle size of the first chromium oxide powder and the second chromium oxide powder is independently 10 μm to 15 μm.

4. The chrome zirconia alumina refractory material according to any one of claims 1 to 3, characterized in that, The mass fraction of Cr2O3 in the first chromium oxide powder is 80% to 85%.

5. The chrome zirconia alumina refractory material according to any one of claims 1 to 3, characterized in that, The mass fraction of Cr2O3 in the second chromium oxide powder is 70% to 80%.

6. The chrome zirconia alumina refractory material according to any one of claims 1 to 3, characterized in that, One or more of the following conditions are met:

7. The chrome zirconia alumina refractory material according to any one of claims 1 to 3, characterized in that, (1) The first aluminum oxide powder comprises aluminum oxide micro powder with a D50 particle size of 2 μm and aluminum oxide ball powder with a D50 particle size of 10 μm to 15 μm; (2) The second aluminum oxide powder comprises aluminum oxide ball powder with a D50 particle size of 10 μm to 15 μm; ​ (3) the mass fraction of Al2O3 in the first alumina powder and the mass fraction of Al2O3 in the second alumina powder are each independently > 98.5%.

8. The chrome zirconia alumina refractory material according to any one of claims 1 to 3, characterized in that, The first binding agent and the second binding agent each independently include one or more of a solid binding agent and a liquid binding agent; The solid binding agent includes one or more of peach gum, gum, dextrin, lignin, lignin sulfonate, orthophosphate, condensed phosphate, and carboxymethyl cellulose salt; The liquid binding agent includes one or more of pulp solution, polyvinyl alcohol solution, silica sol, and water glass.

9. A method of producing a chrome zirconia corundum refractory material according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: Preparation of a molding material containing synthetic chromium corundum powder, fused zirconium mullite powder, first chromium oxide powder, first alumina powder, and first binding agent; The molding material is subjected to isostatic pressing forming treatment to obtain a green body; The green body is subjected to first firing treatment to obtain the chromium-zirconium corundum refractory material.

10. The method of producing a chrome zirconia corundum refractory material according to claim 9, characterized in that The first binding agent includes a solid binding agent and a liquid binding agent; The preparation method of the molding material comprises the following steps: Mixing the first chromium oxide powder, the first alumina powder, and the solid binding agent to obtain a powder; Mixing the powder, the synthetic chromium corundum powder, the fused zirconium mullite powder, and the liquid binding agent to obtain a first mixture; The first mixture is subjected to drying treatment and air-drying treatment to obtain the molding material.

11. A chrome zirconia corundum brick, characterized by, The chromium-zirconium corundum refractory material is made of any one of claims 1-8.

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