A method for pre-evaluating the performance of an alkaline refractory

Abstract

The application discloses a kind of basic refractory performance pre-evaluation test methods, belongs to analytical test method technical field.The application can effectively simulate the high temperature, multi-medium erosion working condition that it endures in actual kiln service environment by being made into the crucible body with specific cavity and filling erosion medium to the basic refractory to be measured, and the section is obtained by cutting the crucible body after simulation service, can be directly observed and analyzed erosion depth and erosion morphology by section, provides direct, reliable basis for evaluating material erosion resistance.Compared with traditional physical and chemical index detection, the pre-evaluation method of the application can truly, accurately reflect the performance of material in actual application environment, can effectively evaluate the use performance of basic refractory, provide reliable basis for screening qualified material and prolonging the service life of basic refractory in coke powder fuel regenerator.

Description

Technical Field

[0001] This invention relates to the field of analytical testing methods, and in particular to a pre-evaluation test method for the performance of alkaline refractory materials. Background Technology

[0002] The performance evaluation of existing alkaline refractories (such as high-temperature magnesia-zirconium bricks and magnesia bricks for regenerators) mainly relies on conventional physicochemical index testing, such as chemical composition, bulk density, and apparent porosity. These traditional methods can only provide a preliminary assessment of the material's basic properties and cannot accurately reflect its erosion resistance and long-term stability under the actual high-temperature, multi-media erosion environment of the kiln. Due to the lack of targeted simulation testing methods, it is difficult to accurately predict the service life of alkaline refractories under complex operating conditions (such as contact with float glass powder, sodium sulfate, petroleum coke powder, etc.), leading to unreasonable material selection, short regenerator maintenance cycles, and high maintenance costs, which affect the continuity of kiln operation and economic benefits. Summary of the Invention

[0003] The main objective of this invention is to provide a test method for pre-evaluating the performance of alkaline refractory materials, thereby solving the technical problem that existing testing methods can only make simple physicochemical index assessments of the performance of alkaline refractory materials and cannot assess their actual performance in use.

[0004] To achieve the above objectives, the present invention provides a pre-evaluation test method for the performance of alkaline refractory materials, comprising the following steps: The alkaline refractory material is processed into a crucible body and a crucible lid. The crucible body includes a bottom and side walls, which form a cavity with an opening. An eroding medium is placed in the cavity, and the opening of the cavity is covered with the crucible lid to assemble the sample to be tested. After heating and holding the sample to be tested, the corrosive medium is removed, and the crucible body is cut open from a direction perpendicular to the bottom to form a cross-section, dividing the bottom, sidewalls and cavity into two parts; The erosion condition of the cut surface is observed and analyzed to evaluate the performance of the alkaline refractory material.

[0005] In some embodiments of the present invention, the thickness of the sidewall is 10 mm or more, and the thickness of the bottom is 10 mm or more.

[0006] In some embodiments of the present invention, the depth of the cavity is set to h1, and the depth of the corrosive medium placed in the cavity is set to h2, satisfying h2 = (1 / 5~7 / 8)h1.

[0007] In some embodiments of the present invention, the heating and heat preservation temperature is 1300℃~1500℃, and the heating and heat preservation time is 6h~8h; And / or, the sample to be tested is placed in a quartz crucible, and the quartz crucible containing the sample to be tested is placed in a heating furnace for the heating and heat preservation treatment.

[0008] In some embodiments of the present invention, the erosion condition is evaluated by at least one of the following indicators: erosion depth, crystallinity change, crystal phase change, and phase change.

[0009] In some embodiments of the present invention, a control sample is made of the same alkaline refractory material as the crucible body, and the original surface of the control sample is used as a reference for evaluating the erosion condition.

[0010] In some embodiments of the present invention, the alkaline refractory material includes magnesia-zirconium bricks, magnesia sand bricks, magnesia-olivine bricks, or magnesia-chrome bricks.

[0011] In some embodiments of the present invention, the corrosive medium includes at least one of glass powder, sodium sulfate, silica sand, batch material, batch material dust, glass dust, petroleum coke powder, and wind tunnel material.

[0012] In some embodiments of the present invention, test indicators are set, and the more erosion conditions that meet the test indicators, the longer the service life of the alkaline refractory material.

[0013] In some embodiments of the present invention, the test indicators include: ①Erosion depth: The maximum erosion depth of a single corrosive medium is ≤5mm; the maximum erosion depth of a mixed corrosive medium is ≤10mm; ② Change in crystallinity: The change amount is ≤2%, and the change amount includes either a decrease in crystallinity or an increase in crystallinity; ③ Change in main crystalline phase: The maximum change after erosion by a single eroding medium is ≤5%; when the single eroding medium is glass powder, glass dust, batch material, batch material dust or air bag accumulation material, the maximum change after erosion is ≤10%; the maximum change after erosion by a mixed eroding medium is ≤10%.

[0014] The beneficial effects that this invention can achieve are: This invention simulates the high-temperature, multi-media erosion conditions that alkaline refractory materials undergo in actual kiln service by fabricating crucible bodies with specific cavities and filling them with eroding media. The crucible body after simulated service is then cut open to obtain cross-sections, allowing for intuitive observation and analysis of erosion depth and morphology. This provides a direct and reliable basis for evaluating the material's erosion resistance.

[0015] Compared with traditional physicochemical index testing, the pre-evaluation method of this invention can truly and accurately reflect the performance of materials in actual application environments, effectively evaluate the performance of alkaline refractory materials, and provide a reliable basis for screening qualified materials and extending the service life of alkaline refractory materials in coke powder fuel regenerators. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the crucible body and crucible lid after processing with alkaline refractory material according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a sample to be tested assembled by placing an eroding medium inside a cavity and covering the cavity opening with a crucible lid, according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the cross-section formed after cutting the crucible body according to an embodiment of the present invention; Figure 4 This is a SEM image of sample A in Example 1 of the present invention after it has been eroded by the eroding medium. Figure 5 This is a phase change diagram of sample B in Example 1 of the present invention after being eroded by the eroding medium.

[0018] Explanation of icon numbers: 10. Crucible body; 20. Crucible lid; 11. Bottom; 12. Side wall; 13. Cavity; 14. Cross-section.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] In this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination should be considered non-existent and not within the scope of protection claimed by this invention.

[0023] This invention provides a pre-evaluation test method for the performance of alkaline refractory materials, comprising the following steps: S10, Reference Figure 1 The basic refractory material is processed into a crucible body 10 and a crucible lid 20; the crucible body 10 includes a bottom 11 and side walls 12, the bottom 11 and side walls 12 forming an open cavity 13, as shown in the reference. Figure 2 The erosion medium is placed in the cavity 13, and the opening of the cavity 13 is covered with the crucible lid 20 to assemble the sample to be tested. S20. After heating and maintaining the temperature of the sample to be tested, remove the corrosive medium, and refer to... Figure 3 The crucible body 10 is cut open from a direction perpendicular to the bottom to form a cut surface 14, and the bottom, side wall and cavity are divided into two parts; S30. Observe and analyze the erosion condition of the cut surface to evaluate the performance of alkaline refractory materials.

[0024] In the regenerator, during operation, one side of the alkaline refractory material is continuously exposed to high temperatures, flowing alkaline vapors, flying debris, and dust, while the other side, serving as the back or support surface, remains relatively intact. Based on this unilateral, directional erosion pattern of alkaline refractory materials, reference... Figure 1 In step S10 of this invention, the alkaline refractory material is processed into a crucible body 10 and a crucible lid 20, and a cavity 13 is formed. The cavity 13 can contain the corrosive medium, allowing the alkaline refractory material to be corroded by the corrosive medium at high temperature. This simulates the actual service state of the alkaline refractory material in the kiln, and truly restores the corrosion situation of the alkaline refractory material in actual use, thereby improving the accuracy of the test and the reliability of the evaluation results.

[0025] In some embodiments, the sidewall thickness is greater than 10 mm to provide sufficient erosion thickness for simulating the erosion process.

[0026] In some embodiments, the thickness of the bottom is greater than 10 mm to provide sufficient erosion thickness for simulating the erosion process.

[0027] In some embodiments, reference Figure 2Let the depth of the cavity be h1, and the depth of the corrosive medium placed in the cavity be h2, satisfying h2 = (1 / 5~7 / 8)h1. h2 can be 1 / 5, 2 / 5, 3 / 5, 4 / 5, 6 / 8, 5 / 8, 4 / 8, 3 / 8, etc. This ensures contact between the corrosive medium and the alkaline refractory material, simulating the actual service state of the alkaline refractory material in the kiln, while also preventing the corrosive medium from overflowing.

[0028] In some embodiments, the prepared crucible body and crucible lid are dried and cooled before the erosion medium is added to the crucible.

[0029] In step S20, the present invention heats and keeps the sample under test, which can simulate the high-temperature environment of the actual operation of the kiln regenerator, promote the physicochemical reaction between the corrosive medium and the alkaline refractory material, and can also reproduce and amplify the corrosion phenomenon of alkaline refractory material that would only appear after a long period of time in actual use by adjusting the heating temperature and heating time, thereby realizing a rapid and effective pre-evaluation of the long-term performance of alkaline refractory material.

[0030] The sample to be tested is placed in a quartz crucible, and then the quartz crucible containing the sample is placed in a high-temperature furnace for heating and holding. The high-temperature furnace includes a reheat furnace.

[0031] In this invention, the heating and holding temperature and time can be determined based on the actual operating temperature of the alkaline refractory material to be evaluated in the regenerator of the kiln and the residence time at this temperature, so as to simulate the most realistic working conditions. Alternatively, the erosion process can be accelerated by adjusting the heating temperature and the heating and holding time, thereby simulating the degree of erosion of alkaline refractory materials under the cumulative use in a short time and saving test time.

[0032] In some embodiments, the heating and heat preservation temperature is 1300℃~1500℃, which can be 1300℃, 1350℃, 1400℃, 1450℃, 1500℃, etc., and the heating and heat preservation time is 6h~8h.

[0033] In some embodiments, the sample to be tested is placed in a quartz crucible, and the quartz crucible containing the sample is placed in a heating furnace for heating and heat preservation.

[0034] In step S30, the crucible body is cut open from a direction perpendicular to the bottom to form a cross-section, and the bottom, sidewalls and cavity are divided into two parts, completely exposing the entire erosion section from the inner wall of the cavity to the outer wall, from the eroded surface to the internal matrix of the material. This allows for clear and intuitive observation and measurement of the maximum erosion depth, the morphological characteristics of the erosion front, and the gradient changes of the internal structure of the material (such as crystal phase and pores) as the erosion process progresses, providing the most direct morphological and structural evidence for evaluating the erosion resistance performance.

[0035] In some embodiments, cutting the crucible body with a metallographic cutting machine helps to obtain a flat, deformation-free, and heat-damaged precision surface, thereby ensuring the accuracy of subsequent assessment of the degree of corrosion.

[0036] In some embodiments, the erosion condition is assessed by at least one of the following methods: erosion depth, crystallinity, phase change, and phase change.

[0037] In this invention, erosion depth refers to the distance to which an alkaline refractory material is penetrated and corroded after being eroded by an corrosive medium.

[0038] In this invention, crystallinity refers to the proportion of crystalline substances in alkaline refractory materials, expressed as a percentage (%), reflecting the integrity and order of the internal crystal structure of the material.

[0039] In this invention, crystal phase change refers to the change in the content of the main crystal phase, that is, the change in the percentage content of the main crystal mineral composition before and after erosion.

[0040] In this invention, phase change refers to the changes in the composition, type and relative content of various mineral phases (including primary crystalline phase and secondary phase) in alkaline refractory materials.

[0041] In some embodiments, the method for observing the depth of erosion includes scanning electron microscopy analysis.

[0042] In some embodiments, methods for observing crystallinity include full width at half maximum (FWHM) analysis or Rietveld refinement analysis of X-ray diffraction patterns.

[0043] In some embodiments, the method for observing phase changes includes qualitative phase analysis by X-ray diffraction and quantitative calculation of the main crystalline phase. The type of the main crystalline phase depends on the material of the alkaline refractory.

[0044] In some embodiments, methods for observing phase changes include X-ray diffraction phase analysis, and can also be combined with energy dispersive spectroscopy or electron backscatter diffraction to analyze the micro-area composition and structure.

[0045] In some embodiments, a control sample is made of the same basic refractory material as the crucible body, and the original surface of the control sample is used as a reference for evaluating the erosion condition. This embodiment, by setting a control sample of the same material as the crucible body and using the original surface as the evaluation benchmark, provides a clear and reliable comparative reference, thereby improving the accuracy and objectivity of the erosion condition observation and analysis results.

[0046] Understandably, the original surface refers to the side of an alkaline refractory material that has not been subjected to chemical damage such as erosion or physical damage such as cutting.

[0047] In some embodiments, alkaline refractory materials include magnesia-zirconium bricks, magnesia-sand bricks, magnesia-olivine bricks, or magnesia-chrome bricks.

[0048] In some embodiments, the corrosive medium includes at least one of glass powder, mirabilite, silica sand, batch material, batch material dust, glass dust, petroleum coke powder, and wind tunnel material.

[0049] A batch material refers to a mixture of various raw materials that are mixed according to a specific glass composition ratio.

[0050] Batch dust refers to the tiny particles or dust generated during the preparation, transportation, and feeding of batch materials.

[0051] Glass dust refers to tiny solid particles composed of the glass body that are generated during the glass production or processing.

[0052] Air-filled material refers to a specific mixture that settles and accumulates from the flue gas in the regenerator of a glass furnace or in a related flue gas treatment system.

[0053] In some embodiments, the glass powder includes float glass powder.

[0054] In some embodiments, test indicators are set, and the more erosion conditions that meet the test indicators, the longer the service life of the alkaline refractory material.

[0055] In some embodiments, the test indicators include: ①Erosion depth: The maximum erosion depth of a single corrosive medium is ≤5mm; the maximum erosion depth of a mixed corrosive medium is ≤10mm; ② Change in crystallinity: The change amount is ≤2%, which includes either a decrease or an increase in crystallinity; ③ Change in main crystalline phase: The maximum change after erosion by a single eroding medium is ≤5%; when the single eroding medium is glass powder, glass dust, batch material, batch material dust or air bag accumulation material, the maximum change after erosion is ≤10%; the maximum change after erosion by a mixed eroding medium is ≤10%.

[0056] A single corrosive medium refers to a medium that consists of only one type, such as glass powder, sodium sulfate, silica sand, batch material, batch material dust, glass dust, petroleum coke powder, or aero-tube accumulated material. Among these, glass powder, glass dust, batch material, batch material dust, or aero-tube accumulated material may contain a greater number of components and can be considered a mixed corrosive medium. Therefore, when the single corrosive medium is glass powder, glass dust, batch material, batch material dust, or aero-tube accumulated material, the criterion is that the maximum change after corrosion is ≤10%.

[0057] Mixed corrosive media refers to corrosive media consisting of two or more types, such as at least two of glass powder, sodium sulfate, silica sand, batch material, batch material dust, glass dust, petroleum coke powder, and wind tunnel material.

[0058] In point ③, the number of corrosive media types should be determined first. If there is only one type of corrosive media, the maximum change after corrosion is ≤5%. Further determine the type of corrosive media. If the corrosive media is glass powder, glass dust, batch material, batch material dust, or air bag accumulated material, that is, the maximum change after corrosion is ≤10%, the test index is met.

[0059] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and are not intended to limit the present invention.

[0060] Example 1 In this embodiment, the alkaline refractory material is magnesia brick, and five samples A, B, C, D, and E are prepared.

[0061] Five types of magnesia bricks were processed into crucible bodies and lids. The crucible body consisted of a bottom and side walls, which formed an open cavity. The cavity dimensions were Φ36mm × 30mm, the side wall thickness was 40mm, and the bottom thickness was 10mm. The lid size was ensured to cover the cavity opening. A control sample of the same material was prepared, a 15mm × 15mm × 2mm square piece, with at least one of the two 15mm × 15mm sides being the original face. The prepared crucible bodies and lids were thoroughly dried in an oven at 110℃ for 8 hours. After cooling, an etching medium was added to the cavity of the crucible body.

[0062] Prepare 11 single or combined etching media according to Table 1. Place the etching media in the cavity of the crucible body, adding the media to a depth of 5 mm from the opening. Cover the opening with the crucible lid to obtain the sample to be tested. Among them, items 1, 2, 3, 4, 5, 6, 8, 9, and 11 are single media, while the glass powder in item 1, the air bag accumulator material in item 4, and the batch material in item 6 can be considered as mixed media. Items 7 and 10 are mixed media.

[0063] The sample to be tested was placed in a 150mm × 75mm quartz crucible, which was then placed in a reheat furnace. The temperature was increased to 1400℃ according to the set heating curve and held for 8 hours. After the holding period, the crucible was cooled with the furnace. The sample was then removed, and any unreacted etching medium in the crucible cavity was cleaned out. The crucible was then cut open from the bottom along the middle using a metallographic cutter to form a cross-section, and the etching condition of the cross-section was observed.

[0064] Assessment of erosion status: (1) Take a thin slice of the eroded area at the bottom of the crucible body and use the original surface of the comparison sample as a control. Observe the erosion depth (color difference change before and after the test) of the thin slice at the bottom of the crucible body using SEM. Among them, the SEM characterization image of sample A after erosion in the 1-glass powder erosion medium is shown in [reference needed]. Figure 4 .

[0065] (2) Take a small sample of the crucible body after it has been etched, and use the original surface of the sample as a control. Use an XRD diffractometer to test the crystallinity and main crystalline phase changes of the small sample before and after etching. The schematic diagram of the phase change of sample B after etching with 3-silica sand is shown.

[0066] Test performance requirements: ①SEM analysis of erosion depth: maximum erosion depth of single medium ≤ 5mm; maximum erosion depth of mixed medium ≤ 10mm; ② Change in crystallinity (decrease or increase): Change amount ≤2%; ③ Changes in the content of the main crystalline phase (pericarpium): The maximum change after erosion by a single eroding medium is ≤5%; when the single eroding medium is batch material, glass powder, or air bag material, it is considered a mixed eroding medium, and the maximum change after erosion is ≤10%; the maximum change after erosion by a mixed medium is ≤10%.

[0067] Table 1 shows the erosion depth data of samples A, B, C, D, and E after being eroded by different eroding media. Tables 2 to 6 show the crystallinity and main phase change test data of samples A, B, C, D, and E after being eroded by different eroding media.

[0068] Table 1

[0069] Table 1 shows that the maximum erosion depth of samples A, B, and C under a single medium is ≤5mm, the maximum erosion depth of samples under a mixed medium is ≤10mm, and sample B has the smallest erosion depth. This indicates that samples A, B, and C have good erosion resistance, and sample B is the best.

[0070] The erosion depth of some corrosive media in samples D and E exceeded the judgment range. The maximum erosion depth of a single medium was greater than 5 mm, and the maximum erosion depth of the mixed medium was greater than 10 mm, indicating that the erosion resistance of samples D and E was relatively poor.

[0071] Table 2. Test data on crystallinity and main phase changes of sample A after erosion by different eroding media.

[0072] Combining Table 1 and Table 2, we can know that sample A: ①Erosion depth: Meets the requirements.

[0073] ② Change in crystallinity: The change in crystallinity after erosion by the corrosive medium is ≤2% for 10 items, 10 items meet the requirements, and 1 item does not meet the requirements.

[0074] ③ Changes in the content of the main crystalline phase (periacrassite): Item 1, glass powder, Item 4, air bag material, and Item 6, batch material are considered as mixed erosion media. The changes after erosion are 16.7, 13.5, and 66.8, respectively. The criterion is that the maximum change after erosion is ≤10%. None of the three items meet the requirements.

[0075] Items 2, 3, 5, 8, 9, and 11 are all single corrosive media, and the changes after corrosion are 0.4, 5.8, 14.3, 16.3, 2.7, and 2.3, respectively. With the maximum change after corrosion ≤5% as the criterion, 3 items meet the requirement, and 3 items do not meet the requirement.

[0076] Items 7 and 11 are mixed media, and the changes after erosion are 28.5 and 6.7 respectively. The criterion is that the maximum change after erosion is ≤10%. Item 1 meets the requirement, and item 1 does not meet the requirement.

[0077] Summary: Tests ① and ② of Sample A all met the test requirements. In Test ③, 4 items met the test requirements, while 7 items did not.

[0078] Table 3. Test data on crystallinity and main phase change of sample B after erosion by different eroding media.

[0079] As shown in Table 3, Sample B: ①Erosion depth: Meets the requirements.

[0080] ② Change in crystallinity: The change in crystallinity after erosion by the eroding medium in all 11 items is ≤2%, and all 11 items meet the requirements.

[0081] ③ Changes in the content of the main crystalline phase (periacrassite): Item 1, glass powder, Item 4, air bag material, and Item 6, batch material are considered as mixed erosion media. The changes after erosion are 5.6, 1.8, and 1.9, respectively. The criterion is that the maximum change after erosion is ≤10%. Item 3 meets the requirements.

[0082] Items 2, 3, 5, 8, 9, and 11 are all single corrosive media, and the changes after corrosion are 2, 1.8, 3.1, 3.8, 3, and 7.2, respectively. The criterion is that the maximum change after corrosion is ≤5%. 5 items meet the requirements, and 1 item does not.

[0083] Items 7 and 11 are mixed media, and the changes after erosion are 8.1 and 7.2 respectively. The criterion is that the maximum change after erosion is ≤10%, and both items meet the requirements.

[0084] In summary, all three tests (①, ②, and ③) of sample B met the test requirements.

[0085] Table 4. Test data on crystallinity and main phase change of sample C after erosion by different eroding media.

[0086] Combining Tables 1 and 4, we can know that sample C: ①Erosion depth: Meets the requirements.

[0087] ② Change in crystallinity: The change in crystallinity after erosion by the corrosive medium is ≤2% in 10 out of 11 items, 10 items meet the requirements, and 1 item does not meet the requirements.

[0088] ③ Changes in the content of the main crystalline phase (periacrassite): Item 1, glass powder, Item 4, air bag material, and Item 6, batch material are considered as mixed erosion media. The changes after erosion are 8.7, 4.8, and 3, respectively. The criterion is that the maximum change after erosion is ≤10%. Item 3 meets the requirements.

[0089] Items 2, 3, 5, 8, 9, and 11 are all single corrosive media, and the changes after corrosion are 7.5, 4.5, 13.2, 0.9, 3.5, and 3.4, respectively. With the maximum change after corrosion ≤5% as the criterion, 4 items meet the requirements, and 2 items do not.

[0090] Items 7 and 11 are mixed media, and the changes after erosion are 11.9 and 3.4 respectively. The criterion is that the maximum change after erosion is ≤10%. Item 1 meets the requirement and 1 item does not meet the requirement.

[0091] Summary: Sample C meets the requirements in test ①, 10 items in test ② meet the requirements and 1 item does not meet the requirements, and 8 items in test ③ meet the requirements and 3 items do not meet the requirements.

[0092] Table 5. Test data on crystallinity and main phase change of sample D after erosion by different eroding media.

[0093] From Table 5, we can see that sample D: ①Erosion depth: Does not meet requirements.

[0094] ② Change in crystallinity: The change in crystallinity after erosion by the eroding medium in all 11 items was ≤2%, and all 11 experiments met the test indicators.

[0095] ③ Changes in the content of the main crystalline phase (periacrassite): Item 1, glass powder, Item 4, air bag material, and Item 6, batch material are considered as mixed erosion media. The changes after erosion are 12.4, 7, and 4.3, respectively. With the maximum change after erosion ≤10% as the criterion, 2 items meet the requirements, and 1 item does not meet the requirements.

[0096] Items 2, 3, 5, 8, 9, and 11 are all single corrosive media, and the changes after corrosion are 11.8, 14.9, 4.2, 5.9, 6.7, and 5.5, respectively. The criterion is that the maximum change after corrosion is ≤5%. Item 1 meets the requirement, and 5 items do not.

[0097] Items 7 and 11 are mixed media, and the changes after erosion are 5 and 5.5 respectively. The criterion is that the maximum change after erosion is ≤10%. Items 2 meet the requirements.

[0098] Summary: Sample D failed test ①, passed test ②, and had 5 items that met the requirements and 6 items that failed the requirements in test ③.

[0099] Table 6. Test data on crystallinity and main phase change of sample E after erosion by different eroding media.

[0100] From Table 6, we can see that sample E: ①Erosion depth: Does not meet requirements.

[0101] ② Change in crystallinity: Among the 11 items, the change in crystallinity after erosion by the corrosive medium is ≤2% for 9 items, which meets the requirements, while 2 items do not.

[0102] ③ Changes in the content of the main crystalline phase (periacrassite): Item 1, glass powder, Item 4, air bag material, and Item 6, batch material are considered as mixed erosion media. The changes after erosion are 4.2, 0.3, and 3.4, respectively. The criterion is that the maximum change after erosion is ≤10%. Item 3 meets the requirements.

[0103] Items 2, 3, 5, 8, 9, and 11 all involve a single corrosive medium, and the changes after corrosion are 0, 2.1, 3.9, 0.2, 2, and 7, respectively. The criterion is that the maximum change after corrosion is ≤5%. 5 items meet the requirement, and 1 item does not.

[0104] Items 7 and 11 are mixed media, and the changes after erosion are 7 and 7 respectively. The criterion is that the maximum change after erosion is ≤10%. Items 2 meet the requirements.

[0105] In summary, for sample E, test ① did not meet the requirements; in test ②, 9 items met the requirements and 2 items did not meet the requirements; and in test ③, 10 items met the requirements and 1 item did not meet the requirements.

[0106] Table 7 Statistics on Actual Usage Effect

[0107] Table 8 Examples

[0108] Table 8 lists the indicators for judging the erosion status as changes in erosion depth, crystallinity, and main crystalline phase, which must satisfy the following: 1. It simultaneously meets three of the following criteria: changes in erosion depth, changes in crystallinity, and changes in main crystalline phase, resulting in the longest average service life; 2. It simultaneously meets 1 to 2 of the following criteria: changes in erosion depth, changes in crystallinity, and changes in main crystalline phase, resulting in a longer average service life; 3. It does not meet three of the following criteria: changes in erosion depth, changes in crystallinity, and changes in main crystal phase, and has the shortest average service life.

[0109] Based on Tables 7 and 8, it can be seen that, in actual use, the average service life of samples A, B, C, D, and E, from longest to shortest, is as follows: Sample B > Sample C > Sample D > Sample A > Sample E. This is consistent with the results verified in Tables 1 to 6 above, indicating that the pre-evaluation test method for the performance of alkaline refractory materials of the present invention is feasible.

[0110] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A pre-evaluation test method for the performance of alkaline refractory materials, characterized in that, Includes the following steps: The alkaline refractory material is processed into a crucible body and a crucible lid. The crucible body includes a bottom and side walls, which form a cavity with an opening. An eroding medium is placed in the cavity, and the opening of the cavity is covered with the crucible lid to assemble the sample to be tested. After heating and holding the sample to be tested, the corrosive medium is removed, and the crucible body is cut open from a direction perpendicular to the bottom to form a cross-section, dividing the bottom, sidewalls and cavity into two parts; The erosion condition of the cut surface is observed and analyzed to evaluate the performance of the alkaline refractory material.

2. The pre-evaluation test method for the performance of alkaline refractory materials according to claim 1, characterized in that, The thickness of the sidewall is 10 mm or more, and the thickness of the bottom is 10 mm or more.

3. The pre-evaluation test method for the performance of alkaline refractory materials according to claim 1, characterized in that, Let the depth of the cavity be h1, and let the depth of the corrosive medium placed in the cavity be h2, satisfying h2 = (1 / 5~7 / 8)h1.

4. The pre-evaluation test method for the performance of alkaline refractory materials according to claim 1, characterized in that, The heating and heat preservation temperature is 1300℃~1500℃, and the heating and heat preservation time is 6h~8h; And / or, the sample to be tested is placed in a quartz crucible, and the quartz crucible containing the sample to be tested is placed in a heating furnace for the heating and heat preservation treatment.

5. The pre-evaluation test method for the performance of alkaline refractory materials according to claim 1, characterized in that, The erosion condition is assessed by at least one of the following indicators: erosion depth, change in crystallinity, change in crystal phase, and change in physical phase.

6. The pre-evaluation test method for the performance of alkaline refractory materials according to claim 1, characterized in that, A control sample was made using the same alkaline refractory material as the crucible body, and the original surface of the control sample was used as a reference for evaluating the erosion condition.

7. The pre-evaluation test method for the performance of alkaline refractory materials according to claim 1, characterized in that, The alkaline refractory materials include magnesia-zirconium bricks, magnesia sand bricks, magnesia-olivine bricks, or magnesia-chrome bricks.

8. The pre-evaluation test method for the performance of alkaline refractory materials according to claim 1, characterized in that, The corrosive medium includes at least one of glass powder, mirabilite, silica sand, batch material, batch material dust, glass dust, petroleum coke powder, and wind tunnel material.

9. The pre-evaluation test method for the performance of alkaline refractory materials according to claim 1, characterized in that, The more test indicators are set, the longer the service life of the alkaline refractory material will be.

10. The pre-evaluation test method for the performance of alkaline refractory materials according to claim 9, characterized in that, The test indicators include: ①Erosion depth: The maximum erosion depth of a single corrosive medium is ≤5mm; the maximum erosion depth of a mixed corrosive medium is ≤10mm; ② Change in crystallinity: The change amount is ≤2%, and the change amount includes either a decrease in crystallinity or an increase in crystallinity; ③ Change in main crystalline phase: The maximum change after erosion by a single eroding medium is ≤5%; when the single eroding medium is glass powder, glass dust, batch material, batch material dust or air bag accumulation material, the maximum change after erosion is ≤10%; the maximum change after erosion by a mixed eroding medium is ≤10%.

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