A test method for the influence of impurity components on the heat resistance of refractory fiber products

Abstract

The present invention provides a method for testing the effects of impurity components on the heat resistance of refractory fiber products, comprising the following steps: a1) testing the heating linear shrinkage values ​​of a first refractory fiber product with and without the first impurity component introduced, respectively, to obtain a first comparison result; b1) testing the heating linear shrinkage values ​​of a second refractory fiber product with and without the first impurity component introduced, respectively, to obtain a second comparison result; the first refractory fiber product and the second refractory fiber product being different; and c1) comparing the first comparison result and the second comparison result to determine the effects of the first impurity component on the heat resistance of the first and second refractory fiber products. The testing method of the present application can simulate the effects of foreign impurity components on refractory fiber products, determine the effects of impurity components on the heat resistance of refractory fiber products, and quantify the effects of impurity components on the heat resistance of refractory fiber products. The method is simple, quick, and low-cost.

Description

Technical Field

[0001] The invention belongs to the technical field of refractory materials, and more particularly relates to a method for testing the influence of impurity components on the temperature resistance of refractory fiber products. Background Art

[0002] As an energy-saving furnace lining material, refractory fiber products are widely used in high-temperature furnaces in petrochemical, steel, ceramic, battery and other industries. Refractory fiber is a porous material with a porosity of more than 90% and a specific surface area of ​​0.4~0.8m 2 During high-temperature operation, some industrial kilns contain impurities such as alkali metal compounds (Na2O, K2O, Li2O, NaCl, KCl, LiCl, Na2CO3, K2CO3, Li2CO3, etc.), alkaline earth metal compounds (CaO, MgO, CaCl2, MgCl2, CaCO3, MgCO3, etc.), and iron compounds (Fe, Fe2O3, Fe3O4, etc.) due to fuel impurities or volatilization or scattering of the processed medium. These impurities, whether through direct contact or as dust dispersed in the high-temperature atmosphere, can easily penetrate the porous structure of the fiber and enter the interior, interacting with the refractory fiber product at high temperatures. The introduction of these impurities can lower the temperature at which the liquid phase forms in the refractory fiber, accelerate grain growth, and ultimately, fiber aging, severely impacting the heat resistance and service life of the refractory fiber product.

[0003] However, there has been no specific research data on the effects of different types of impurity components on the heat resistance of different types of refractory fiber products, and it is impossible to clearly explain the impact of the introduction of impurity components on the heat resistance of refractory fiber products. In some industrial kilns where the introduction of impurity components is unavoidable, there is no specific literature data to refer to on how to select refractory fiber materials and how to minimize the impact of impurity components on refractory fiber products. If the impurity components are directly introduced into the raw materials and the test method of the impact of impurity components on the performance of refractory fibers is carried out, on the one hand, it is impossible to simulate the impact of foreign impurity components on refractory fiber products, and on the other hand, the test process is time-consuming, labor-intensive, and costly. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a testing method for the influence of impurity components on the temperature resistance of refractory fiber products, which can simply, quickly and at low cost measure the influence of impurity components on the temperature resistance of refractory fiber products.

[0005] The present application provides a method for testing the influence of impurity components on the heat resistance of refractory fiber products, comprising the following steps:

[0006] a1) measuring the heating linear shrinkage values ​​of the first refractory fiber product with and without the first impurity component introduced, respectively, to obtain a first comparison result;

[0007] b1) measuring the heating linear shrinkage values ​​of the second refractory fiber product with and without the first impurity component introduced, respectively, to obtain a second comparison result; the first refractory fiber product and the second refractory fiber product are different;

[0008] c1) comparing the first comparison result and the second comparison result to determine the influence of the first impurity component on the temperature resistance of the first refractory fiber product and the second refractory fiber product.

[0009] In some specific implementations, before step c1), the following steps are further included:

[0010] Testing the heating linear shrinkage values ​​of the third refractory fiber product with and without the first impurity component introduced, respectively, to obtain a third comparison result; the third refractory fiber product is different from the second refractory fiber product and the first refractory fiber product;

[0011] The first comparison result, the second comparison result and the third comparison result are compared to determine the influence of the first impurity component on the temperature resistance of the first refractory fiber product, the second refractory fiber product and the third refractory fiber product.

[0012] The present application also provides a method for testing the influence of impurity components on the heat resistance of refractory fiber products, comprising the following steps:

[0013] a2) measuring the heating linear shrinkage values ​​of the fourth refractory fiber product with and without the second impurity component introduced, respectively, to obtain a fourth comparison result;

[0014] b2) measuring the heating linear shrinkage values ​​of the fourth refractory fiber product with and without the third impurity component introduced, respectively, to obtain a fifth comparison result; the second impurity component and the third impurity component are different;

[0015] c2) comparing the fourth comparison result and the fifth comparison result to determine the effects of the second impurity component and the third impurity component on the temperature resistance of the fourth refractory fiber product.

[0016] In some specific implementations, before step c2), the following steps are further included:

[0017] Testing the heating linear shrinkage values ​​of the fourth refractory fiber product with and without the fourth impurity component introduced, respectively, to obtain a sixth comparison result; the fourth impurity component is different from the second impurity component and the third impurity component;

[0018] The fourth comparison result, the fifth comparison result and the sixth comparison result are compared to determine the influence of the second impurity component, the third impurity component and the fourth impurity component on the temperature resistance of the fourth refractory fiber product.

[0019] In some specific implementations, the first impurity component, the second impurity component, the third impurity component and the fourth impurity component are independently selected from one or more compounds containing impurity elements, and the impurity elements are selected from one or more of Na, K, Li, Fe, Ca, and Mg.

[0020] In some specific implementations, the impurity element-containing compound is selected from one or more of a hydroxide containing an impurity element, a chloride containing an impurity element, a carbonate containing an impurity element, a bicarbonate containing an impurity element, a nitrate containing an impurity element, an organic acid salt containing an impurity element, and an organic alcohol salt containing an impurity element.

[0021] In some specific implementations, the heating linear shrinkage value of the refractory fiber product into which the impurity component is introduced is tested according to the following method:

[0022] providing an impurity component solution comprising a compound containing an impurity element and a solvent;

[0023] The refractory fiber product is immersed in the impurity component solution to absorb the impurity component, and after drying, the impurity component-introduced refractory fiber product is obtained; the weight ratio of the solvent in the impurity component solution to the refractory fiber product is η, where η is the weight ratio of the solvent to the refractory fiber product in which the refractory fiber product is completely and evenly impregnated;

[0024] The heating linear shrinkage value of the refractory fiber product into which the impurity components are introduced is tested.

[0025] In some specific implementations, the heating linear shrinkage value of the refractory fiber product without the introduction of impurity components is tested according to the following method:

[0026] The refractory fiber product is immersed in a solvent and dried to obtain a refractory fiber product free of impurity components; the weight ratio of the solvent to the refractory fiber product is η, where η is the weight ratio of the solvent to the refractory fiber product that can completely and evenly immerse the refractory fiber product;

[0027] The heating linear shrinkage value of the refractory fiber product into which no impurity components are introduced is tested.

[0028] In some specific implementations, the drying is microwave drying.

[0029] In some specific implementations, the refractory fiber product is an ordinary refractory fiber product, a standard refractory fiber product, a high-purity refractory fiber product, a high-aluminum refractory fiber product, a zirconium-containing refractory fiber product, a zirconium-aluminum refractory fiber product or an alumina fiber refractory fiber product, etc.

[0030] The present invention provides a method for testing the effect of impurity components on the heat resistance of refractory fiber products, comprising the following steps: a1) testing the heating line shrinkage values ​​of a first refractory fiber product with and without the introduction of a first impurity component, respectively, to obtain a first comparison result; b1) testing the heating line shrinkage values ​​of a second refractory fiber product with and without the introduction of the first impurity component, respectively, to obtain a second comparison result; the first refractory fiber product and the second refractory fiber product are different; c1) comparing the first comparison result and the second comparison result to determine the effect of the first impurity component on the heat resistance of the first refractory fiber product and the second refractory fiber product. This application uses the heating line shrinkage value as an indicator of the heat resistance of refractory fiber products. The smaller the heating line shrinkage value, the lower the probability of shrinkage cracks occurring in the refractory fiber product during use in a high-temperature kiln; under the same conditions, the smaller the heating line shrinkage value of the refractory fiber product, the better the heat resistance of the product. The present application determines the influence of impurity components on the heat resistance of refractory fiber products by testing the heating line shrinkage value of refractory fiber products into which impurity components are introduced, comparing the heating line shrinkage value with the blank sample (i.e., refractory fiber products into which impurity components are not introduced), and comparing the heating line shrinkage value with the heating line shrinkage value of other different types of refractory fiber products into which the same impurity components are added. The testing method provided in the present application can simulate the influence of foreign impurity components on refractory fiber products, determine the influence of impurity components on the heat resistance of refractory fiber products, and quantify the influence of impurity components on the heat resistance of refractory fiber products. It is simple, fast, and low-cost. Furthermore, the testing method provided in the present application prevents the surface migration of impurity components by completely impregnating and rapidly drying with microwaves, and uniformly introduces impurity components into refractory fiber products, thereby improving the accuracy of the test. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The present invention provides a method for testing the influence of impurity components on the heat resistance of refractory fiber products, comprising the following steps:

[0033] a1) measuring the heating linear shrinkage values ​​of the first refractory fiber product with and without the first impurity component introduced, respectively, to obtain a first comparison result;

[0034] b1) measuring the heating linear shrinkage values ​​of the second refractory fiber product with and without the first impurity component introduced, respectively, to obtain a second comparison result; the first refractory fiber product and the second refractory fiber product are different;

[0035] c1) comparing the first comparison result and the second comparison result to determine the influence of the first impurity component on the temperature resistance of the first refractory fiber product and the second refractory fiber product.

[0036] In order to gain a deeper understanding of the influence of foreign impurity components on the heat resistance of refractory fibers, facilitate the application of refractory fibers and avoid the introduction of impurity components as much as possible, thereby more scientifically selecting furnace lining materials, the present invention provides a simple, fast and low-cost testing method for the influence of impurity components on the heat resistance of refractory fiber products.

[0037] The most commonly used metric for evaluating the heat resistance of refractory fiber products is the heating line shrinkage value (also known as the permanent change in the heating line; the permanent change in the heating line of refractory fiber products is generally negative). The smaller the heating line shrinkage value, the less likely the refractory fiber product will develop shrinkage cracks during use in high-temperature kilns. Under the same conditions, the smaller the product's heating line shrinkage value, the better the product's heat resistance. The present invention determines the impact of impurity components on the heat resistance of refractory fiber products by testing the heating line shrinkage value of refractory fiber products to which impurity components have been introduced, comparing it with the heating line shrinkage value of blank samples (i.e., refractory fiber products without impurity components), and comparing it with the heating line shrinkage values ​​of different types of refractory fiber products to which the same impurity components have been added.

[0038] The present invention first tests the heating line shrinkage value of a first refractory fiber product with and without the introduction of the first impurity component, respectively, to obtain a first comparison result; then tests the heating line shrinkage value of a second refractory fiber product with and without the introduction of the first impurity component, respectively, to obtain a second comparison result; the first refractory fiber product and the second refractory fiber product are different; finally, the first comparison result and the second comparison result are compared to determine the influence of the first impurity component on the temperature resistance of the first refractory fiber product and the second refractory fiber product.

[0039] The method provided in this application can test the effect of the same impurity component on the heat resistance of different types of refractory fiber products. In the present invention, the introduced impurity component is preferably a solvent-soluble compound containing impurity elements. Among them, the impurity element is preferably selected from one or more of Na, K, Li, Fe, Ca, and Mg (which can be selected according to the impurity components in the actual use environment of the kiln), and the compound is preferably one or more of hydroxides, chlorides, carbonates, bicarbonates, nitrates, organic acid salts, and organic alcohol salts. The solvent is preferably a common, easily available, non-toxic inorganic solvent or one or more mixtures of organic solvents. The present invention has no special restrictions on the source of the above-mentioned introduced impurity components, and commercially available products familiar to those skilled in the art can be used.

[0040] In a preferred embodiment of the present invention, the introduced impurity component is Na2CO3, and the solvent is pure water. In a preferred embodiment of the present invention, the introduced impurity component is Fe2O3, and the solvent is a dilute hydrochloric acid solution, preferably a dilute hydrochloric acid solution with a concentration of 0.5wt% to 2wt%.

[0041] The present application has no special restrictions on the type of the refractory fiber products, including but not limited to ordinary refractory fiber products, standard refractory fiber products, high-purity refractory fiber products, high-aluminum refractory fiber products, zirconium-containing refractory fiber products, zirconium-aluminum refractory fiber products or alumina fiber refractory fiber products, etc.

[0042] The first and second refractory fiber products are different types of products, and the results of the effect of the same impurity component on the heat resistance of the different types of refractory fiber products can be obtained. The first and second refractory fiber products can be the same type of products but with different specific compositions, and the results of the effect of the same impurity component on the heat resistance of the same type of refractory fiber products but with different specific compositions can be obtained.

[0043] In the present invention, the heating linear shrinkage value of the blank sample (i.e., the refractory fiber product without the introduction of impurity components) is tested according to the following method:

[0044] The refractory fiber product is immersed in a solvent and dried to obtain a refractory fiber product free of impurity components; the weight ratio of the solvent to the refractory fiber product is η, where η is the weight ratio of the solvent to the refractory fiber product that can completely and evenly immerse the refractory fiber product;

[0045] The heating linear shrinkage value of the refractory fiber product into which no impurity components are introduced is tested.

[0046] Specifically, it may include the following steps:

[0047] (1) Conduct a test on the weight ratio of solvent that can be completely and evenly absorbed by refractory fiber products, and determine the weight ratio of solvent to product at which the solvent can completely and evenly impregnate the refractory fiber products. The weight ratio of solvent to refractory fiber product is recorded as η;

[0048] (2) Referring to the test method for the shrinkage value of the heating line of refractory fiber products, measure a square refractory fiber product with a side length of 100 mm and a thickness equal to the normal thickness of a fiber blanket, and weigh the fiber product, recorded as: m;

[0049] (3) Weighing a solvent with a weight of mη, and uniformly and completely impregnating the above-mentioned refractory fiber products; finally, rapidly drying the products by microwave drying to prepare blank samples free of impurities;

[0050] (4) Test the heating linear shrinkage value of the blank sample.

[0051] In some specific implementations, three sets of parallel experiments are performed, specifically including the following steps:

[0052] (1) Conduct a test on the weight ratio of solvent that can be completely and evenly absorbed by refractory fiber products, and determine the weight ratio of solvent to product at which the solvent can completely and evenly impregnate the refractory fiber products. The weight ratio of solvent to refractory fiber product is recorded as η;

[0053] (2) Referring to the test method for the shrinkage value of heating line of refractory fiber products, measure three square refractory fiber products with a side length of 100 mm and a thickness equal to the normal thickness of fiber blanket, and weigh the fiber products, recorded as: m 01 、m 02 、m 03 ;

[0054] (3) Weigh the weight m 01 η, m 02 η, m 03 The three refractory fiber products were uniformly and completely impregnated with the solvent of η; finally, they were quickly dried by microwave drying process to prepare blank samples without impurity components;

[0055] (4) Test the heating linear shrinkage values ​​of the three blank samples and take the average value.

[0056] In the present invention, the test method for the heating linear shrinkage value of the refractory fiber product in the above step (2) is preferably based on GB / T 17911.

[0057] In the subsequent steps of the present invention, the heating linear shrinkage value of the above sample is tested by referring to the method specified in GB / T 17911.

[0058] In the present invention, the heating linear shrinkage value of the refractory fiber product introduced with impurity components is tested according to the following method:

[0059] providing an impurity component solution comprising a compound containing an impurity element and a solvent;

[0060] The refractory fiber product is immersed in the impurity component solution to absorb the impurity component, and after drying, the impurity component-introduced refractory fiber product is obtained; the weight ratio of the solvent in the impurity component solution to the refractory fiber product is η, where η is the weight ratio of the solvent to the refractory fiber product in which the refractory fiber product is completely and evenly impregnated;

[0061] The heating linear shrinkage value of the refractory fiber product into which the impurity components are introduced is tested.

[0062] Specifically, it includes the following steps:

[0063] (1) Take a sample of refractory fiber product with the size of 100 mm × 100 mm × product thickness and weigh the weight of the refractory fiber product, recorded as: m1;

[0064] (2) Based on the impurity element oxide, determine the mass ratio ω of the impurity component to be introduced, and calculate the amount of the impurity element oxide: m2 = m1 × ω; and convert the amount of the impurity element oxide m2 into the weight of the impurity element compound m3;

[0065] (4) Weighing the amount of impurity compound m3 and completely dissolving it in a solvent with a weight of m1η; then immersing the above-mentioned refractory fiber sample in the above-mentioned solution, ensuring that the fiber product evenly and completely absorbs the above-mentioned solution and then drying it to prevent the surface migration of the impurity components, thereby obtaining a refractory fiber product with the impurity components introduced;

[0066] (5) Testing the heating linear shrinkage value of the refractory fiber product into which the impurity components are introduced.

[0067] In some specific implementations, three sets of parallel experiments are performed, specifically including the following steps:

[0068] (1) Similarly, take three samples of refractory fiber products with the same size of 100 mm × 100 mm × product thickness, and weigh the weight of the refractory fiber products, recorded as: m 11 、m 12 、m 13 ;

[0069] (2) Based on the impurity element oxides, determine the mass ratio ω of the impurity components to be introduced and calculate the amount of impurity element oxides: m 21 =m 11 ×ω;m 22 =m 12 ×ω;m 23 =m 13 ×ω; and the number of impurity element oxides m 21 、m22 、m 23 The weight of the compound replaced by the impurity element m 31 、m 32 、m 33 ;

[0070] (4) Weigh the amount of impurity compound m 31 、m 32 、m 33 , completely dissolved in a mass of m 11 η, m 12 η, m 13 η solvent; after the above three fiber refractory fiber samples were immersed in the above three solutions, to ensure that the fiber products uniformly and completely absorbed the above solution after drying to prevent the surface migration of impurity components, to obtain the introduction of impurity components refractory fiber products;

[0071] (5) Test the heating linear shrinkage values ​​of three refractory fiber products with impurity components introduced and take the average value.

[0072] In the present invention, the impregnation method in the above step (4) is preferably complete impregnation; and the drying method is preferably microwave drying.

[0073] In the present invention, the test method for the heating line shrinkage is preferably referred to GB / T 17911, that is, the obtained refractory fiber product with introduced impurity components is also tested for the heating line shrinkage value of the sample by referring to the method determined in GB / T 17911.

[0074] After obtaining the heating line shrinkage values ​​of the first refractory fiber product with and without the introduction of the first impurity component, a first comparison result is obtained; then, according to the same method, a second comparison result of the second refractory fiber product with and without the introduction of the first impurity component is obtained, and the first comparison result and the second comparison result are compared to determine the influence of the same first impurity component on the temperature resistance of different first refractory fiber products and second refractory fiber products.

[0075] In some specific implementations, before step c1), the method further includes: measuring the heating linear shrinkage value of a third refractory fiber product with and without the first impurity component introduced, respectively, to obtain a third comparison result; the third refractory fiber product is different from the second refractory fiber product and the first refractory fiber product;

[0076] The first comparison result, the second comparison result and the third comparison result are compared to determine the influence of the first impurity component on the temperature resistance of the first refractory fiber product, the second refractory fiber product and the third refractory fiber product.

[0077] According to the same method as described above, a third comparison result of a third refractory fiber product that is different from the first refractory fiber product and the second refractory fiber product with and without the first impurity component introduced is obtained. By comparing the first comparison result, the second comparison result and the third comparison result, the influence of the same first impurity component on the temperature resistance of different first refractory fiber products, the second refractory fiber product and the third refractory fiber product can be determined.

[0078] The present application also provides a method for testing the influence of impurity components on the heat resistance of refractory fiber products, comprising the following steps:

[0079] a2) measuring the heating linear shrinkage values ​​of the fourth refractory fiber product with and without the second impurity component introduced, respectively, to obtain a fourth comparison result;

[0080] b2) measuring the heating linear shrinkage values ​​of the fourth refractory fiber product with and without the third impurity component introduced, respectively, to obtain a fifth comparison result; the second impurity component and the third impurity component are different;

[0081] c2) comparing the fourth comparison result and the fifth comparison result to determine the effects of the second impurity component and the third impurity component on the temperature resistance of the fourth refractory fiber product.

[0082] The method provided in this application can test the effect of different impurity components on the heat resistance of the same type of refractory fiber products. Specifically, according to the same method as described above, the heating line shrinkage values ​​of the fourth refractory fiber product with and without the introduction of the second impurity component are tested respectively to obtain a fourth comparison result; then, the heating line shrinkage values ​​of the fourth refractory fiber product with and without the introduction of the third impurity component are tested respectively to obtain a fifth comparison result; the second impurity component and the third impurity component are different; finally, the fourth comparison result and the fifth comparison result are compared to determine the effect of the different second impurity components and the third impurity components on the heat resistance of the fourth refractory fiber product.

[0083] In some specific implementations, before step c2), the method further includes: measuring the heating linear shrinkage value of the fourth refractory fiber product with and without the fourth impurity component introduced, respectively, to obtain a sixth comparison result; the fourth impurity component is different from the second impurity component and the third impurity component;

[0084] The fourth comparison result, the fifth comparison result and the sixth comparison result are compared to determine the influence of the second impurity component, the third impurity component and the fourth impurity component on the temperature resistance of the fourth refractory fiber product.

[0085] According to the same method as described above, a sixth comparison result is obtained in which the fourth impurity component that is different from the second impurity component and the third impurity component is introduced into the fourth refractory fiber product and the fourth impurity component is not introduced. By comparing the fourth comparison result, the fifth comparison result and the sixth comparison result, the influence of different second impurity components, third impurity components and fourth impurity components on the temperature resistance of the same fourth refractory fiber product can be determined.

[0086] The present application uses the heating line shrinkage value as an indicator of the heat resistance of refractory fiber products, and determines the influence of impurity components on the heat resistance of refractory fiber products by testing the heating line shrinkage value of refractory fiber products with impurity components introduced, comparing it with the heating line shrinkage value of blank samples (i.e., refractory fiber products without impurity components introduced), and comparing it with the heating line shrinkage values ​​of other different types of refractory fiber products with the same impurity components added. The testing method provided in the present application can simulate the influence of foreign impurity components on refractory fiber products, determine the influence of impurity components on the heat resistance of refractory fiber products, and quantify the influence of impurity components on the heat resistance of refractory fiber products. It is simple, fast, and low-cost. Furthermore, the testing method provided in the present application prevents the surface migration of impurity components by completely impregnating and rapidly drying with microwaves, and uniformly introduces impurity components into refractory fiber products, which can improve the accuracy of the test.

[0087] In order to further illustrate the present invention, the following examples are given below to provide a detailed description.

[0088] Example 1: Test on the influence of impurity Na on the temperature resistance of high-aluminum ceramic fiber blanket

[0089] The refractory fiber product tested is a high-aluminum ceramic fiber blanket with a thickness of 25mm and a bulk density of 128kg / m 3 The impurity component compound tested was sodium carbonate (Na2CO3), and pure water was selected as the solvent.

[0090] 1. Blank sample preparation:

[0091] (1) First, the water absorption performance test of high-aluminum ceramic fiber blanket was carried out to determine the weight ratio of solvent to refractory fiber product to be in the range of 3.5~4.5, and the final η value was determined to be 4.0;

[0092] (2) Refer to the test method for the shrinkage value of heating line of refractory fiber products (GB / T 17911), measure three square high-aluminum ceramic fiber blanket samples with a side length of 100 mm, and weigh the fiber blanket, which is recorded as: m 01 =32.50g, m 02 =33.6g, m 03 =31.04g;

[0093] (3) Weigh the weight m01 η=32.5×4=130.0g,m 02 η=33.6×4=134.4g,m 03 η = 31.04 × 4 = 124.16 g of pure water was used to evenly and completely immerse the three fiber blanket samples mentioned above. Finally, blank samples containing no impurities were prepared by rapid drying using a microwave drying process.

[0094] (4) Referring to the method specified in GB / T 17911, the linear shrinkage values ​​of the three blank samples tested at 1350°C for 24 hours were 2.8%, 2.9%, and 2.7%, respectively, with an average linear shrinkage value of 2.8%. This is the same as the linear shrinkage value of high-aluminum ceramic fiber blankets tested in daily testing, indicating that there is no significant difference between the linear shrinkage values ​​of the blank samples and the unimpregnated samples.

[0095] 2. Preparation of samples containing Na impurities:

[0096] (1) Similarly, take three square high-aluminum ceramic fiber blanket samples with a side length of 100 mm and weigh the weight of the fiber products, recorded as: m 11 =33.40g, m 12 =32.78g, m 13 =31.85g;

[0097] (2) Based on Na2O, determine the mass ratio of the impurity components to be introduced, ω = 1.5% wt., and calculate the planned amount of Na2O to be added: m 21 =33.40g×1.5%wt.=0.50g;m 22 =32.78g×1.5%wt.=0.49g;m 23 =31.85×1.5%wt.=0.48g. And the amount of impurity element oxide (Na2O) m 21 、m 22 、m 23 The weight of the compound (Na2CO3) replaced by the impurity element:

[0098] m 31 ;

[0099] m 32 ;

[0100] m 33 ;

[0101] (4) Weigh the weight of Na2CO3: m 31 =0.86g, m 32 =0.84g, m 33= 0.82g, completely dissolved in m 11 η=33.40×4=133.60g, m 12 η=32.78×4=131.12g, m 13 η = 31.85 × 4 = 127.40 g of solvent was stirred evenly to prepare a Na2CO3 solution. The three fiber blanket samples were then immersed in the three solutions to ensure that the fiber blankets evenly and completely absorbed the solutions. Finally, microwave drying was performed to prevent surface migration of impurity components to prepare samples containing Na impurity components.

[0102] (5) Referring to the method specified in GB / T 17911, the linear shrinkage values ​​of the three samples containing impurities after heating at 1350°C for 24 hours were 3.1%, 3.2%, and 3.1%, respectively, with an average linear shrinkage value of 3.1%. Compared with the sample without the introduction of impurities, the linear shrinkage value increased by 0.3%, with an increase of 10.7%.

[0103] Example 2: Test on the influence of impurity Na on the temperature resistance of zirconium-aluminum ceramic fiber blanket

[0104] The classification temperature of zirconium-aluminum ceramic fiber blanket is the same as that of high-aluminum ceramic fiber blanket, both of which are 1350℃. The effect of Na on the temperature resistance of zirconium-aluminum ceramic fiber blanket was tested to determine the effect of impurity Na on the temperature resistance of the two refractory fiber products.

[0105] The test fiber blanket has a thickness of 25 mm and a bulk density of 128 kg / m 3 . The same method as in Example 1 was used. The content of the added impurity component was calculated based on Na2O, and was also 1.5%wt. The test conditions for the heating line shrinkage value were also 1350℃×24h. The heating line shrinkage values ​​of the three blank samples were 2.9%, 3.0%, and 2.9%, respectively, with an average value of 2.9%; the heating line shrinkage values ​​of the samples with added impurity components were 12.6%, 12.1%, and 12.5%, respectively, with an average value of 12.4%. Compared with the samples without the introduction of impurity components, the heating line shrinkage value of the impurity-containing samples increased by 9.5%, and the increase ratio was 328%.

[0106] From Examples 1 and 2 above, it can be seen that although the classification temperature of high-aluminum ceramic fiber and zirconium-aluminum ceramic fiber is both 1350°C, and the heating line shrinkage values ​​of the two blank samples at 1350°C × 24h are basically the same, the heating line shrinkage value of the high-aluminum ceramic fiber blanket with 1.5% wt. Na2O impurity component added is much lower than that of the zirconium-aluminum ceramic fiber blanket with 1.5% wt. Na2O impurity component added, indicating that the high-aluminum ceramic fiber blanket has better resistance to Na impurities. The heat resistance of both refractory fiber products can meet the requirements, and in industrial kilns containing Na impurity components, high-aluminum ceramic fiber products are preferred over zirconium-aluminum ceramic fiber products. Through comparative experiments similar to those in Examples 1 and 2, we can study the effect of the same impurity component on the heat resistance of different types of refractory fiber products, providing a basis for the selection of refractory fiber furnace linings.

[0107] Example 3: Test on the influence of impurity Fe on the temperature resistance of zirconium-aluminum ceramic fiber blanket

[0108] The refractory fiber product tested is a zirconium-aluminum ceramic fiber blanket with a thickness of 25 mm and a bulk density of 128 kg / m 3 The impurity component compound tested was Fe oxide (Fe2O3), and the solvent selected was 1% dilute hydrochloric acid solution.

[0109] The test method is basically the same as that in Example 1, except that the solvent selected is a 1% dilute hydrochloric acid solution. The content of the added impurity component is calculated based on Fe2O3 and is also 1.5wt.%. The test conditions for the heating line shrinkage value are also 1350℃×24h. The heating line shrinkage values ​​of the three blank samples are 2.8%, 2.9%, and 3.0%, respectively, with an average value of 2.9%; the heating line shrinkage values ​​of the samples with added impurity components are 5.6%, 5.8%, and 5.5%, respectively, with an average value of 5.6%. Compared with the sample without the introduction of impurity components, the heating line shrinkage value of the sample containing 1.5%wt. Fe2O3 increased by 2.7%, and the increase ratio was 93%.

[0110] For zirconium-aluminum ceramic fibers, Fe2O3 and Na2O are both impurity components. From the comparison of the above-mentioned Example 2 and Example 3, it can be seen that the heating line shrinkage values ​​of the samples with the same impurity component content are also quite different. The heating line shrinkage value of the sample with the addition of Na2O impurities is larger, and the heating line shrinkage value of the sample with the addition of Fe2O3 impurities is relatively small. This group of experiments reminds us that the introduction of Na2O impurities must be strictly controlled during the production and use of ceramic fiber products. Through comparative experiments similar to Implementation 2 and Implementation 3, we can determine the influence of different types of impurity components on the temperature resistance of the same refractory fiber product, and provide guidance for the selection of raw materials and the selection of raw materials and energy materials for some users.

[0111] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. A method for testing the influence of impurity components on the heat resistance of refractory fiber products, characterized in that: The following steps are involved: a1) measuring the heating linear shrinkage values ​​of the first refractory fiber product with and without the first impurity component introduced, respectively, to obtain a first comparison result; b1) measuring the heating linear shrinkage values ​​of the second refractory fiber product with and without the first impurity component introduced, respectively, to obtain a second comparison result; the first refractory fiber product and the second refractory fiber product are different; c1) comparing the first comparison result with the second comparison result to determine the effect of the first impurity component on the temperature resistance of the first refractory fiber product and the second refractory fiber product; The heating linear shrinkage value of the refractory fiber product introduced with impurity components is tested according to the following method: providing an impurity component solution comprising a compound containing an impurity element and a solvent; immersing the refractory fiber product in the impurity component solution to absorb the impurity component, and obtaining the refractory fiber product with the impurity component introduced after drying; The weight ratio of the solvent in the impurity component solution to the refractory fiber product is η, where η is the weight ratio of the solvent to the refractory fiber product that completely and evenly impregnates the refractory fiber product; Testing the heating linear shrinkage value of the refractory fiber product into which the impurity components are introduced; The heating linear shrinkage value of refractory fiber products without the introduction of impurity components is tested according to the following method: The refractory fiber product is immersed in a solvent and dried to obtain a refractory fiber product free of impurity components; the weight ratio of the solvent to the refractory fiber product is η, where η is the weight ratio of the solvent to the refractory fiber product that can completely and evenly immerse the refractory fiber product; The heating linear shrinkage value of the refractory fiber product into which no impurity components are introduced is tested.

2. The testing method according to claim 1, wherein: Before step c1), the method further includes: Testing the heating linear shrinkage values ​​of the third refractory fiber product with and without the first impurity component introduced, respectively, to obtain a third comparison result; the third refractory fiber product is different from the second refractory fiber product and the first refractory fiber product; The first comparison result, the second comparison result and the third comparison result are compared to determine the influence of the first impurity component on the temperature resistance of the first refractory fiber product, the second refractory fiber product and the third refractory fiber product.

3. A method for testing the influence of impurity components on the heat resistance of refractory fiber products, characterized in that: The following steps are involved: a2) measuring the heating linear shrinkage values ​​of the fourth refractory fiber product with and without the second impurity component introduced, respectively, to obtain a fourth comparison result; b2) measuring the heating linear shrinkage values ​​of the fourth refractory fiber product with and without the third impurity component introduced, respectively, to obtain a fifth comparison result; the second impurity component and the third impurity component are different; c2) comparing the fourth comparison result and the fifth comparison result to determine the effects of the second impurity component and the third impurity component on the temperature resistance of the fourth refractory fiber product; The heating linear shrinkage value of the refractory fiber product introduced with impurity components is tested according to the following method: providing an impurity component solution comprising a compound containing an impurity element and a solvent; immersing the refractory fiber product in the impurity component solution to absorb the impurity component, and obtaining the refractory fiber product with the impurity component introduced after drying; The weight ratio of the solvent in the impurity component solution to the refractory fiber product is η, where η is the weight ratio of the solvent to the refractory fiber product that completely and evenly impregnates the refractory fiber product; Testing the heating linear shrinkage value of the refractory fiber product into which the impurity components are introduced; The heating linear shrinkage value of refractory fiber products without the introduction of impurity components is tested according to the following method: The refractory fiber product is immersed in a solvent and dried to obtain a refractory fiber product free of impurity components; the weight ratio of the solvent to the refractory fiber product is η, where η is the weight ratio of the solvent to the refractory fiber product that can completely and evenly immerse the refractory fiber product; The heating linear shrinkage value of the refractory fiber product into which no impurity components are introduced is tested.

4. The testing method according to claim 3, wherein: Before step c2), the following steps are also included: Testing the heating linear shrinkage values ​​of the fourth refractory fiber product with and without the fourth impurity component introduced, respectively, to obtain a sixth comparison result; the fourth impurity component is different from the second impurity component and the third impurity component; The fourth comparison result, the fifth comparison result and the sixth comparison result are compared to determine the influence of the second impurity component, the third impurity component and the fourth impurity component on the temperature resistance of the fourth refractory fiber product.

5. The testing method according to any one of claims 1 to 4, characterized in that: The first impurity component, the second impurity component, the third impurity component and the fourth impurity component are independently selected from one or more compounds containing impurity elements, and the impurity elements are selected from one or more of Na, K, Li, Fe, Ca and Mg.

6. The testing method according to claim 5, characterized in that: The impurity element-containing compound is selected from one or more of a hydroxide containing an impurity element, a chloride containing an impurity element, a carbonate containing an impurity element, a bicarbonate containing an impurity element, a nitrate containing an impurity element, an organic acid salt containing an impurity element, and an organic alcohol salt containing an impurity element.

7. The testing method according to any one of claims 1 to 4, characterized in that: The drying is microwave drying.

8. The testing method according to claim 5, wherein: The refractory fiber products are ordinary refractory fiber products, standard refractory fiber products, high-purity refractory fiber products, high-aluminum refractory fiber products, zirconium-containing refractory fiber products, zirconium-aluminum refractory fiber products or alumina fiber refractory fiber products.