Micro-swelling high-strength wear-resistant zirconium embedded mortar and preparation method thereof

Abstract

The application relates to the technical field of refractory materials, and discloses a kind of micro-expansion high-strength wear-resistant zircon inlaying fire clay and a preparation method thereof.The fire clay is prepared from slide plate brick regenerated material, fused white corundum, alumina powder, calcium aluminate cement, micro-silica powder, special additives and dihydrogen aluminum phosphate binder as raw materials through physical blending.The zircon inlaying fire clay has good cohesiveness in cold state, high resistance to molten steel penetration in high-temperature use, low linear change rate after burning, effectively reduces the shrinkage rate of the fire clay in high-temperature use, and the gap between the used zircon ring and the mother brick at the brick joint is not appeared after using the zircon ring and the mother brick for more than 20 furnaces, which is beneficial to improve the resistance of the zircon inlaying fire clay to molten steel and molten slag erosion, corrosion and penetration.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refractory materials, in particular to a micro-expansion high-strength wear-resistant zircon inlay fire mud and a preparation method thereof. BACKGROUND

[0002] Since the slide plate brick needs to be washed by molten steel and oxidized in a high oxidizing atmosphere, and frequently suffers from rapid cooling and heating, the performance requirements for the slide plate brick are extremely strict. At present, the slide plate bricks and slag blocking slide plates of large ladles are mainly made of aluminum-zirconium-carbon material. Such slide plates often have poor erosion resistance, poor thermal shock stability, and many cracks and large hole expansion after use, which has great safety risks. With the continuous harshness of smelting conditions and the continuous improvement of steel grade requirements, therefore, the slide plate usually uses zirconium rings and plates for inlay to improve the service life.

[0003] Since most refractory muds will crack the binder under high temperature conditions, or will produce a large shrinkage due to sintering, which will easily become a channel for molten steel and slag erosion during use, and then produce concave, affecting the service life of the slide plate. On the other hand, due to the inconsistent expansion and shrinkage of the mother brick and the zirconium ring and plate, a gap is formed by extrusion, which will cause the zirconium ring and plate to loosen or fall off and break during use. SUMMARY

[0004] The purpose of the present application is to provide a micro-expansion high-strength wear-resistant zircon inlay fire mud and a preparation method thereof. On the basis of the original corundum zircon inlay fire mud, a phosphate binding system is used, and special additives are added, so that the cost of the zircon inlay fire mud material can be greatly reduced by using waste slide plate recycled materials. After impregnation with pitch and carbonization process, a micro-expansion high-strength wear-resistant zircon inlay fire mud with stable performance, high bonding strength and excellent slag resistance is developed.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A micro-expansion high-strength wear-resistant zircon inlay fire mud comprises the following raw materials by weight: 30-50 parts of slide plate brick recycled material, 20-50 parts of electrically fused white corundum, 10-25 parts of alumina powder, 2-6 parts of calcium aluminate cement, 1-2 parts of micro-silicon powder, 1-4 parts of special additives, and 10-15 parts of aluminum dihydrogen phosphate binder.

[0007] Further preferably, the particle size of the slide plate brick recycled material particles is 0.1-1mm or ≤0.088mm, and the Al2O3 content is ≥70%.

[0008] Further preferably, the particle size of the alumina powder is ≤5μm, and the Al2O3 content is ≥99%.

[0009] Further preferably, the calcium aluminate cement has a particle size of ≤0.045 mm and an Al2O3 content of ≥70%.

[0010] Further preferably, the micro-silica powder has a particle size of ≤0.074 mm and a SiO2 content of ≥90%.

[0011] Further preferably, the special additive is at least one of BN, AlN, SiC and Sialon, with a particle size of ≤0.045 mm.

[0012] Further preferably, the aluminum dihydrogen phosphate binder is an aluminum dihydrogen phosphate solution with a mass fraction of 85%.

[0013] A preparation method of the micro-expansion high-strength wear-resistant zircon-inlaid fire mortar, comprising the following steps:

[0014] In the first step, each raw material is weighed according to the weight fraction and is prepared for use.

[0015] In the second step, the slide plate brick regenerative material, the fused white corundum, the alumina fine powder, the calcium aluminate cement, the micro-silica powder and the special additive are sequentially added into a vertical forced mixer and are mixed for 2-3 min, then the aluminum dihydrogen phosphate binder is added into the mixer and is mixed for 6-8 min.

[0016] Further preferably, the use method of the zircon-inlaid fire mortar comprises the following steps:

[0017] In the first step, the inner cavity part of the mother brick is scraped clean before the slide plate is inlaid and assembled, the wet zircon ring and the plate are wetted by using the aluminum dihydrogen phosphate binder, then the assembly surface of the inner cavity part of the mother brick is wetted by using the brush with the aluminum dihydrogen phosphate binder, the fire mortar is uniformly applied to the corresponding bonding part, and finally the zircon ring, the plate and the slide plate to be bonded are tightly bonded and cemented by using the rubber hammer to strike, so that the fire mortar is full and compact.

[0018] In the second step, after the inlaid and assembled slide plate brick is pre-dried and dried, it is subjected to the asphalt oil immersion and carbonization process.

[0019] In the above technical solution, the slide plate brick regenerative material and the fused white corundum particles can play a supporting role, and the corundum fine powder is the main component of the fire mortar matrix; the aluminum dihydrogen phosphate, the pure calcium aluminate and the micro-silica powder are used in combination to improve the bonding performance and the strength of the fire mortar, and the special additive is the key to improving the expansion, wear resistance and slag resistance of the slide plate fire mortar. The waste slide plate particles are used as the raw material, which can significantly reduce the raw material cost, and the asphalt immersion and carbonization treatment can further improve the bonding strength and the slag resistance of the fire mortar.

[0020] The beneficial effects of the present application are as follows:

[0021] The zircon embedded fire clay produced by the application has good cohesiveness in cold state, high resistance to penetration of molten steel in high temperature, and the linear change rate after burning can be changed from original -4 to -6% to +0.75%, effectively reducing the shrinkage rate of the fire clay in high temperature use. The zircon ring sliding plate used for slag blocking can be used for more than 20 heats, and no gap appears between the used zircon ring and the mother brick, which is beneficial to improve the resistance of the embedded zircon fire clay to molten steel and molten slag erosion, corrosion and penetration.

[0022] Of course, it is not necessary for any product implementing the present application to achieve all the advantages mentioned above. DETAILED DESCRIPTION

[0023] The technical solutions of the present application will be described clearly and completely in combination with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0024] In the following embodiments, the particle size of the sliding plate brick recycled material is 0.088 mm, the Al2O3 content is 70%; the particle size of the alumina fine powder is 5 μm, the Al2O3 content is 99%, and the Al2O3 content is 70%; the particle size of the calcium aluminate cement is 0.045 mm; the particle size of the micro silica powder is 0.074 mm, and the silicon dioxide content is 90%.

[0025] Embodiment 1

[0026] A kind of micro-expansion high-strength wear-resistant embedded zircon fire clay, including the following weight parts of raw materials: sliding plate brick recycled material 30 parts, fused white corundum 20 parts, alumina fine powder 10 parts, calcium aluminate cement 2 parts, micro silica powder 1 part, BN with particle size of 0.045 mm 1 part, 10 parts of 85% mass fraction of aluminum dihydrogen phosphate solution;

[0027] The preparation method of the fire clay comprises the following steps:

[0028] First step, according to the weight fraction, the raw materials are weighed and prepared;

[0029] Second step, the sliding plate brick recycled material, fused white corundum, alumina fine powder, calcium aluminate cement, micro silica powder and BN with particle size of 0.045 mm are sequentially added into a vertical forced mixer and mixed for 2 min, then the aluminum dihydrogen phosphate binder is added into the mixer and mixed for 6 min.

[0030] Embodiment 2

[0031] A kind of micro-swelling high-strength wear-resistant zircon inlay fire mud, including the following weight parts of raw materials: sliding plate brick recycled material 40 parts, fused white corundum 30 parts, alumina powder 15 parts, calcium aluminate cement 3 parts, micro-silica powder 1.5 parts, AlN with particle size of 0.045mm 2 parts, aluminum dihydrogen phosphate solution with mass fraction of 85% 12 parts;

[0032] The preparation method of the fire mud includes the following steps:

[0033] First step, according to weight fraction, each raw material is weighed, and is ready for use;

[0034] Second step, sliding plate brick recycled material, fused white corundum, alumina powder, calcium aluminate cement, micro-silica powder and AlN with particle size of 0.045mm are sequentially added into vertical forced mixer and mixed for 3min, then aluminum dihydrogen phosphate binder is added into the mixer and mixed for 8min.

[0035] Example 3

[0036] A kind of micro-swelling high-strength wear-resistant zircon inlay fire mud, including the following weight parts of raw materials: sliding plate brick recycled material 40 parts, fused white corundum 30 parts, alumina powder 15 parts, calcium aluminate cement 3 parts, micro-silica powder 1.5 parts, SiC with particle size of 0.045mm 2 parts, aluminum dihydrogen phosphate solution with mass fraction of 85% 12 parts;

[0037] The preparation method of the fire mud includes the following steps:

[0038] First step, according to weight fraction, each raw material is weighed, and is ready for use;

[0039] Second step, sliding plate brick recycled material, fused white corundum, alumina powder, calcium aluminate cement, micro-silica powder and SiC with particle size of 0.045mm are sequentially added into vertical forced mixer and mixed for 3min, then aluminum dihydrogen phosphate binder is added into the mixer and mixed for 8min.

[0040] Example 4

[0041] A kind of micro-swelling high-strength wear-resistant zircon inlay fire mud, including the following weight parts of raw materials: sliding plate brick recycled material 50 parts, fused white corundum 50 parts, alumina powder 25 parts, calcium aluminate cement 6 parts, micro-silica powder 2 parts, Sialon with particle size of 0.045mm 4 parts, aluminum dihydrogen phosphate solution with mass fraction of 85% 15 parts;

[0042] The preparation method of the fire mud includes the following steps:

[0043] First step, according to weight fraction, each raw material is weighed, and is ready for use;

[0044] Secondly, the sliding plate brick recycled material, fused white corundum, alumina powder, calcium aluminate cement, microsilica and Sialon with a particle size of 0.045mm are sequentially added into a vertical forced mixer and mixed for 3 minutes, then the aluminum dihydrogen phosphate binder is added into the mixer and mixed for 8 minutes.

[0045] According to the standard GB / T 5988-2007, the linear change rate of the fire clay prepared in Examples 1-4 is tested; according to the standard GB / T 34218-2017, the compressive strength of the fire clay prepared in Examples 1-4 is tested; according to the standard GB / T 3002-2004, the flexural strength of the fire clay prepared in Examples 1-4 is tested; according to the standard GB / T 14907-2002, the bonding strength of the fire clay prepared in Examples 1-4 is tested, and the results are shown in the following table:

[0046]

[0047] It can be seen from the data in the analysis table that the fire clay prepared in the embodiments has multiple advantages such as high strength, low change rate, good bonding performance, etc., and the use of the fire clay prepared in the embodiments can effectively resist the penetration of molten steel, reduce the shrinkage rate of the fire clay at high temperature, and is beneficial to improve the resistance of the zircon inlay fire clay to molten steel and molten slag erosion, corrosion and penetration, and has good use performance.

[0048] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0049] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A micro-expansion, high-strength, wear-resistant zircon-inlaid fire putty, characterized in that, It is composed of the following raw materials in parts by weight: 30-50 parts of recycled skateboard bricks, 20-50 parts of fused white corundum, 10-25 parts of fine alumina powder, 2-6 parts of calcium aluminate cement, 1-2 parts of silica fume, 1-4 parts of special additives, and 10-15 parts of aluminum dihydrogen phosphate binder. The special additive is at least one of BN, AlN, SiC, and Sialon with a particle size ≤0.045mm; The aluminum dihydrogen phosphate binder is an 85% aluminum dihydrogen phosphate solution by mass. The particle size of the recycled skateboard brick particles is 0.1-1mm or ≤0.088mm, and the Al2O3 content is ≥70%.

2. The micro-expansion high-strength wear-resistant zircon-inlaid fire putty according to claim 1, characterized in that, The alumina fine powder has a particle size ≤5μm and an Al2O3 content ≥99%.

3. The micro-expansion high-strength wear-resistant zircon-embedded fire putty according to claim 1, characterized in that, The calcium aluminate cement has a particle size ≤0.045mm and an Al2O3 content ≥70%.

4. The micro-expansion high-strength wear-resistant zircon-inlaid fire putty according to claim 1, characterized in that, The microsilica powder has a particle size ≤0.074mm and a silica content ≥90%.

5. The method for preparing a micro-expansion high-strength wear-resistant zircon-inlaid fire putty as described in claim 1, characterized in that, Includes the following steps: Step 1: Weigh each ingredient according to its weight fraction and set aside. The second step is to add the recycled skateboard bricks, fused white corundum, fine alumina powder, calcium aluminate cement, silica fume and special additives to a vertical forced mixer in sequence and mix for 2-3 minutes. Then add aluminum dihydrogen phosphate binder to the mixer and mix for 6-8 minutes.

6. The micro-expansion high-strength wear-resistant zircon-embedded fire putty according to claim 1, characterized in that, The method of using the zircon-inlaid fire putty includes the following steps: Step 1: Before assembling the slide plate, clean the inner cavity of the mother brick. Use aluminum dihydrogen phosphate binder to wet the zircon ring and plate. Then, use a brush with aluminum dihydrogen phosphate binder to wet the assembly surface of the inner cavity of the mother brick. Apply fire putty evenly to the corresponding bonding parts. Finally, use a rubber hammer to tap and promote the bonding of the zircon ring, plate and slide plate to the slide plate, so that the fire putty is full and dense. Step 2: After pre-drying and drying the assembled sliding tile bricks, they are then subjected to asphalt immersion and carbonization processes.

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