Production process and application of aluminum-magnesium spinel brick material

Abstract

The invention relates to the technical field of aluminum-magnesium spinel bricks, in particular to a production process and application of an aluminum-magnesium spinel brick material, and the production process comprises the following steps: weighing the following raw materials in parts by weight: 30-35 parts of corundum, 8-12 parts of aluminum-magnesium spinel, 6-10 parts of a doped filler, 5-8 parts of a coordinating additive, 4-7 parts of magnesia powder, 3-5 parts of aluminum oxide and 1-3 parts of a binding agent. According to the aluminum-magnesium spinel brick material disclosed by the invention, the corundum is matched with the aluminum-magnesium spinel, the magnesia powder, the aluminum oxide and the binding agent raw materials, and meanwhile, the doped filler and the coordinating additive are added as blending and coordinating raw materials, so that the prepared aluminum-magnesium spinel brick realizes coordinated improvement of apparent porosity performance, wear resistance and pressure resistance; and the product has remarkable water resistance and cold and heat resistance stability.

Description

Technical Field

[0001] The invention relates to the technical field of alumina-magnesia spinel bricks, and in particular to a production process of alumina-magnesia spinel brick materials and applications thereof. Background Art

[0002] Aluminum-magnesium spinel bricks are new high-performance refractory materials, widely used in high-temperature kilns and heat treatment equipment in the steel, ironmaking, cement, glass and other industries. Existing aluminum-magnesium spinel bricks have poor apparent porosity performance, poor wear resistance and compressive resistance, and it is difficult to achieve coordinated performance improvement; and the product has poor water resistance, cold and heat stability, which limits the use efficiency of the product. Summary of the invention

[0003] In view of the defects of the prior art, the purpose of the present invention is to provide a production process of an alumina-magnesia spinel brick material and its application to solve the problems raised in the above background technology.

[0004] The present invention solves the technical problem by adopting the following technical solution: The present invention provides a production process of an alumina-magnesia spinel brick material, comprising the following steps: Step 1: weigh the raw materials according to weight: 30-35 parts of corundum, 8-12 parts of aluminum-magnesium spinel, 6-10 parts of added filler, 5-8 parts of coordination additive, 4-7 parts of magnesia powder, 3-5 parts of alumina, 1-3 parts of binder; Step 2: Mix the above raw materials thoroughly, and then perform molding process at a molding pressure of 50 MPa for 1 hour; Step three, sintering the formed product for another 2-4 hours at a sintering temperature of 1500-1600°C, and after sintering, obtaining an alumina-magnesia spinel brick material.

[0005] Preferably, the particle size of the corundum is 0.5-0.6 mm; the particle size of the magnesia powder is 0.3-0.4 mm; the particle size of the alumina is 0.01-0.02 mm; the particle size of the alumina-magnesium spinel is 0.3-0.4 mm; and the binder is a pulp solution.

[0006] Preferably, the preparation method of the added filler is: S01: Stir the calcium sulfate whiskers thoroughly in a sufficient amount of 5% by mass hydrogen peroxide solution, then wash, filter and dry; Sodium carboxymethyl cellulose, 5% by mass lanthanum chloride solution and nano-silica sol are fully mixed in a weight ratio of (2-3): (5-7): 1 to obtain sodium carboxymethyl cellulose solution; S02: Stirring the dried calcium sulfate whiskers and sodium carboxymethyl cellulose solution in a weight ratio of 3:5 to obtain a calcium sulfate whisker solution; S03: Preparation of filler: S031: 2-3 parts by weight of a boron nitride modifier and 1-3 parts by weight of a urea solution are mixed and added into 5-8 parts by weight of a 5% dopamine hydrochloride solution, and stirred evenly to obtain a polyadjusted solution; S032: 3-5 parts by weight of barium sulfate, 5-8 parts by weight of sodium dodecylbenzene sulfonate solution and 2-3 parts by weight of sodium alginate are mixed to obtain a barium sulfate solution; The reconstitution liquid and the barium sulfate liquid were subjected to ultrasonic treatment in a weight ratio of 4:3, and finally filtered and dried to obtain a filler; S04: Calcium sulfate whisker solution and filler are mixed and ball-milled in a weight ratio of 5:3 at a ball-milling speed of 1000 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain the added filler.

[0007] Preferably, the mass fraction of the sodium dodecylbenzene sulfonate solution is 3-5%; the mass fraction of the urea solution is 2-4%.

[0008] Preferably, the ultrasonic power of the ultrasonic treatment in S032 is 300-350W, and the ultrasonic treatment is performed for 2 hours.

[0009] Preferably, the preparation method of the boron nitride modifier is: 3-5 parts by weight of boron nitride and 2-3 parts by weight of zirconium oxide are added to 5-8 parts by weight of yttrium nitrate solution, followed by adding 2-3 parts by weight of calcium titanate, blending thoroughly, then filtering and drying, and sintering at 170-180°C for 1h. After sintering, ball milling through 100 meshes is performed to obtain a boron nitride modifier.

[0010] The added filler is a calcium sulfate whisker treated with a hydrogen peroxide solution for optimization and improvement, and then treated with a sodium carboxymethyl cellulose solution for stirring and improvement. The sodium carboxymethyl cellulose, 5% by mass lanthanum chloride solution and nano-silica sol in the sodium carboxymethyl cellulose solution are coordinated and optimized into the system, so that the calcium sulfate whisker solution and the filler can be better ball-milled and improved, the composite liquid and the barium sulfate solution in the filler are optimized and improved by ultrasonic composite mixing, the boron nitride modifier and urea solution in the composite liquid are blended and blended with a 5% by mass dopamine hydrochloride solution, and the barium sulfate in the barium sulfate solution is blended with a sodium dodecylbenzene sulfonate solution and sodium alginate. Through the coordination and synergy between the raw materials, the prepared filler is further supplemented and filled into the system, so that the performance coordination and performance stability of the system are significantly improved; The boron nitride modifier is further formulated into the system by improving the blending of boron nitride, zirconium oxide, calcium titanate and yttrium nitrate, and then sintering optimization treatment. The performance effect of the product system is further improved.

[0011] Preferably, the mass fraction of the yttrium nitrate solution is 2-4%.

[0012] Preferably, the preparation method of the coordination additive is as follows: S101: Add clay and titanium oxide into the barium nitrate solution and mix well to obtain a coordination liquid; the mass ratio of clay, titanium oxide and barium nitrate solution is (2-4):1:(4-7); S102: Blend 4-6 parts by weight of cordierite and 3-4 parts by weight of mica powder into 5-8 parts by weight of sodium lignosulfonate solution, and then add 1-2 parts by weight of silane coupling agent KH550 and mix well to obtain a cordierite liquid; Ultrasonically treat the cordierite liquid and the coordination liquid according to a weight ratio of 3:5. After the ultrasonic treatment is completed, filter by suction and dry to obtain a coordination additive.

[0013] The coordination additive is prepared by mixing clay and titanium oxide with a barium nitrate solution to form a coordination liquid. At the same time, cordierite and mica powder are blended into a sodium lignosulfonate solution, and then combined with silane coupling agent KH550 to obtain a cordierite liquid. Through the blending and optimization of the cordierite liquid and the coordination liquid, the prepared coordination additive further reinforces the added filler, thereby further improving the performance of the product.

[0014] Preferably, the mass fraction of the barium nitrate solution is 2-5%; the mass fraction of the sodium lignosulfonate solution is 5-8%; the ultrasonic power of the ultrasonic treatment is 450-500W, and the ultrasonic treatment is carried out for 1h.

[0015] The present invention also provides an application of a production process of an aluminum-magnesium spinel brick material in the preparation of an aluminum-magnesium spinel brick.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The aluminum-magnesium spinel brick material of the present invention uses corundum in combination with aluminum-magnesium spinel, magnesite powder, alumina, and binder raw materials. At the same time, added fillers and coordination additives are added as blending and coordinating raw materials. The apparent porosity performance, wear resistance, and compressive strength of the prepared aluminum-magnesium spinel brick are coordinately improved, and the water resistance, heat and cold stability of the product are remarkable. Specific embodiments

[0017] The following combines specific embodiments to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0018] A production process of an aluminum-magnesium spinel brick material in this embodiment includes the following steps: Step 1: weigh the raw materials according to weight: 30-35 parts of corundum, 8-12 parts of aluminum-magnesium spinel, 6-10 parts of added filler, 5-8 parts of coordination additive, 4-7 parts of magnesia powder, 3-5 parts of alumina, 1-3 parts of binder; Step 2: Mix the above raw materials thoroughly, and then perform molding process at a molding pressure of 50 MPa for 1 hour; Step three, sintering the formed product for another 2-4 hours at a sintering temperature of 1500-1600°C, and after sintering, obtaining an alumina-magnesia spinel brick material.

[0019] In this embodiment, the particle size of the corundum is 0.5-0.6 mm; the particle size of the magnesia powder is 0.3-0.4 mm; the particle size of the alumina is 0.01-0.02 mm; the particle size of the alumina-magnesium spinel is 0.3-0.4 mm; and the binder is a pulp solution.

[0020] The preparation method of the added filler of this embodiment is: S01: Stir the calcium sulfate whiskers thoroughly in a sufficient amount of 5% by mass hydrogen peroxide solution, then wash, filter and dry; Sodium carboxymethyl cellulose, 5% by mass lanthanum chloride solution and nano-silica sol are fully mixed in a weight ratio of (2-3): (5-7): 1 to obtain sodium carboxymethyl cellulose solution; S02: Stirring the dried calcium sulfate whiskers and sodium carboxymethyl cellulose solution in a weight ratio of 3:5 to obtain a calcium sulfate whisker solution; S03: Preparation of filler: S031: 2-3 parts by weight of a boron nitride modifier and 1-3 parts by weight of a urea solution are mixed and added into 5-8 parts by weight of a 5% dopamine hydrochloride solution, and stirred evenly to obtain a compounding solution; S032: 3-5 parts by weight of barium sulfate, 5-8 parts by weight of sodium dodecylbenzene sulfonate solution and 2-3 parts by weight of sodium alginate are mixed to obtain a barium sulfate solution; The reconstitution liquid and the barium sulfate liquid were subjected to ultrasonic treatment in a weight ratio of 4:3, and finally filtered and dried to obtain a filler; S04: Calcium sulfate whisker solution and filler are mixed and ball-milled in a weight ratio of 5:3 at a ball-milling speed of 1000 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain the added filler.

[0021] The mass fraction of the sodium dodecylbenzene sulfonate solution in this embodiment is 3-5%; the mass fraction of the urea solution is 2-4%.

[0022] The ultrasonic power of the ultrasonic treatment in S032 of this embodiment is 300-350W, and the ultrasonic treatment is performed for 2h.

[0023] The preparation method of the boron nitride modifier in this embodiment is as follows: Add 3-5 parts by weight of boron nitride and 2-3 parts by weight of zirconia into 5-8 parts by weight of yttrium nitrate solution, then add 2-3 parts by weight of calcium titanate, mix well, then filter and dry, and then sinter at 170-180 °C for 1 h. After sintering, grind through 100 meshes to obtain the boron nitride modifier.

[0024] The mass fraction of the yttrium nitrate solution in this embodiment is 2-4%.

[0025] The preparation method of the coordination additive in this embodiment is as follows: S101: Add clay and titanium oxide into barium nitrate solution and mix well to obtain a coordination solution; the mass ratio of clay, titanium oxide and barium nitrate solution is (2-4):1:(4-7); S102: Add 4-6 parts by weight of cordierite and 3-4 parts by weight of mica powder into 5-8 parts by weight of sodium lignosulfonate solution, then add 1-2 parts by weight of silane coupling agent KH550, mix well to obtain a cordierite solution; Ultrasonically treat the cordierite solution and the coordination solution according to a weight ratio of 3:5. After ultrasonic treatment, filter and dry to obtain the coordination additive.

[0026] The mass fraction of the barium nitrate solution in this embodiment is 2-5%; the mass fraction of the sodium lignosulfonate solution is 5-8%; the ultrasonic power of the ultrasonic treatment is 450-500 W, and ultrasonic treatment is carried out for 1 h.

[0027] The application of the production process of a kind of aluminum-magnesium spinel brick material in this embodiment in the preparation of aluminum-magnesium spinel bricks.

[0028] Example 1 The production process of a kind of aluminum-magnesium spinel brick material in this embodiment includes the following steps: Step 1, weigh the raw materials according to parts by weight: 30 parts of corundum, 8 parts of aluminum-magnesium spinel, 6 parts of added filler, 5 parts of coordination additive, 4 parts of magnesia powder, 3 parts of alumina, 1 part of binder; Step 2, mix the above raw materials well, and then carry out molding treatment, the molding pressure is 50 MPa, and the molding time is 1 h; Step 3, sinter the molded product for another 2 h, the sintering temperature is 1500 °C, and after sintering, the aluminum-magnesium spinel brick material is obtained.

[0029] The particle size of the corundum in this embodiment is 0.5 mm; the particle size of the magnesia powder is 0.3 mm; the particle size of the alumina is 0.01 mm; the particle size of the aluminum-magnesium spinel is 0.3 mm; the binder is a pulp solution.

[0030] The preparation method of the added filler of this embodiment is: S01: Stir the calcium sulfate whiskers thoroughly in a sufficient amount of 5% by mass hydrogen peroxide solution, then wash, filter and dry; Sodium carboxymethyl cellulose, 5% by mass lanthanum chloride solution and nano-silica sol are fully mixed in a weight ratio of 2:5:1 to obtain sodium carboxymethyl cellulose solution; S02: Stirring the dried calcium sulfate whiskers and sodium carboxymethyl cellulose solution in a weight ratio of 3:5 to obtain a calcium sulfate whisker solution; S03: Preparation of filler: S031: 2 parts by weight of a boron nitride modifier and 1 part by weight of a urea solution are mixed and added into 5 parts by weight of a 5% dopamine hydrochloride solution, and stirred evenly to obtain a polyadjusted solution; S032: 3 parts by weight of barium sulfate, 5 parts by weight of sodium dodecylbenzene sulfonate solution and 2 parts by weight of sodium alginate are mixed to obtain a barium sulfate solution; The reconstitution liquid and the barium sulfate liquid were subjected to ultrasonic treatment in a weight ratio of 4:3, and finally filtered and dried to obtain a filler; S04: Calcium sulfate whisker solution and filler are mixed and ball-milled in a weight ratio of 5:3 at a ball-milling speed of 1000 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain the added filler.

[0031] The mass fraction of the sodium dodecylbenzene sulfonate solution in this embodiment is 3-5%; the mass fraction of the urea solution is 2-4%.

[0032] The ultrasonic power of the ultrasonic treatment in S032 of this embodiment is 300W, and the ultrasonic treatment is performed for 2h.

[0033] The preparation method of the boron nitride modifier of this embodiment is: Add 3 parts by weight of boron nitride and 2 parts by weight of zirconium oxide to 5 parts by weight of yttrium nitrate solution, then add 2 parts by weight of calcium titanate, mix thoroughly, filter, dry, and sinter at 170°C for 1 hour. After sintering, ball mill through 100 mesh to obtain a boron nitride modifier.

[0034] The mass fraction of the yttrium nitrate solution in this embodiment is 2%.

[0035] The preparation method of the coordination additive of this embodiment is: S101: adding clay and titanium oxide to a barium nitrate solution and mixing them thoroughly to obtain a coordination solution; wherein the mass ratio of clay, titanium oxide and barium nitrate solution is 2:1:4; S102: Blend 4 parts by weight of cordierite and 3 parts by weight of mica powder and add them to 5 parts by weight of sodium lignosulfonate solution. Then add 1 part by weight of silane coupling agent KH550 and blend thoroughly to obtain cordierite solution; Perform ultrasonic treatment on the cordierite solution and the coordination solution according to a weight ratio of 3:5. After the ultrasonic treatment ends, perform suction filtration and drying to obtain a coordination additive.

[0036] In this embodiment, the mass fraction of the barium nitrate solution is 2%; the mass fraction of the sodium lignosulfonate solution is 5%; the ultrasonic power of the ultrasonic treatment is 450 W, and the ultrasonic treatment is performed for 1 h.

[0037] Application of the production process of an aluminum-magnesium spinel brick material in this embodiment in the preparation of aluminum-magnesium spinel bricks.

[0038] Example 2 The production process of an aluminum-magnesium spinel brick material in this embodiment includes the following steps: Step 1: Weigh raw materials according to parts by weight: 35 parts of corundum, 12 parts of aluminum-magnesium spinel, 10 parts of added filler, 8 parts of coordination additive, 7 parts of magnesia powder, 5 parts of alumina, 3 parts of binder; Step 2: Mix the above raw materials thoroughly, and then perform molding treatment. The molding pressure is 50 MPa, and the molding is performed for 1 h; Step 3: Sinter the molded product for another 4 h at a sintering temperature of 1600 °C. After the sintering ends, an aluminum-magnesium spinel brick material is obtained.

[0039] In this embodiment, the particle size of the corundum is 0.6 mm; the particle size of the magnesia powder is 0.4 mm; the particle size of the alumina is 0.02 mm; the particle size of the aluminum-magnesium spinel is 0.4 mm; the binder is a pulp solution.

[0040] The preparation method of the added filler in this embodiment is: S01: Stir calcium sulfate whiskers sufficiently in a sufficient amount of hydrogen peroxide solution with a mass fraction of 5%, and then wash, perform suction filtration, and dry; Blend sodium carboxymethylcellulose, a lanthanum chloride solution with a mass fraction of 5%, and nano-silica sol according to a weight ratio of 3:7:1 and blend thoroughly to obtain sodium carboxymethylcellulose solution; S02: Stir the dried calcium sulfate whiskers and the sodium carboxymethylcellulose solution according to a weight ratio of 3:5 to obtain calcium sulfate whisker solution; S03: Preparation of filler: S031: Blend 3 parts by weight of boron nitride modifier and 3 parts by weight of urea solution and add them to 8 parts by weight of hydrochloric acid dopamine solution with a mass fraction of 5%, and stir evenly to obtain a complex modulation solution; S032: 5 parts by weight of barium sulfate, 8 parts by weight of sodium dodecylbenzene sulfonate solution and 3 parts by weight of sodium alginate are mixed to obtain a barium sulfate solution; The reconstitution liquid and the barium sulfate liquid were subjected to ultrasonic treatment in a weight ratio of 4:3, and finally filtered and dried to obtain a filler; S04: Calcium sulfate whisker solution and filler are mixed and ball-milled in a weight ratio of 5:3 at a ball-milling speed of 1000 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain the added filler.

[0041] The mass fraction of the sodium dodecylbenzene sulfonate solution in this embodiment is 5%; the mass fraction of the urea solution is 4%.

[0042] The ultrasonic treatment in S032 of this embodiment is performed with an ultrasonic power of 350 W and ultrasonic treatment for 2 h.

[0043] The preparation method of the boron nitride modifier of this embodiment is: Add 5 parts by weight of boron nitride and 3 parts by weight of zirconium oxide to 8 parts by weight of yttrium nitrate solution, then add 3 parts by weight of calcium titanate, mix thoroughly, filter, dry, and sinter at 180°C for 1 hour. After sintering, ball mill through 100 mesh to obtain a boron nitride modifier.

[0044] The mass fraction of the yttrium nitrate solution in this embodiment is 4%.

[0045] The preparation method of the coordination additive of this embodiment is: S101: adding clay and titanium oxide to the barium nitrate solution and mixing them thoroughly to obtain a coordination solution; wherein the mass ratio of clay, titanium oxide and barium nitrate solution is 4:1:7; S102: 6 parts by weight of cordierite and 4 parts by weight of mica powder are blended and added to 8 parts by weight of sodium lignin sulfonate solution, and then 2 parts by weight of silane coupling agent KH550 are added and blended sufficiently to obtain cordierite liquid; The cordierite liquid and the coordination liquid were ultrasonically treated in a weight ratio of 3:5. After the ultrasonic treatment was completed, the coordination additive was filtered and dried to obtain the coordination additive.

[0046] The mass fraction of the barium nitrate solution in this embodiment is 5%; the mass fraction of the sodium lignin sulfonate solution is 8%; the ultrasonic power of the ultrasonic treatment is 500W, and the ultrasonic treatment is performed for 1 hour.

[0047] The production process of an alumina-magnesia spinel brick material in this embodiment is applied in the preparation of alumina-magnesia spinel bricks.

[0048] Example 3 A production process of an alumina-magnesia spinel brick material of this embodiment includes the following steps: Step 1: weigh the raw materials according to weight: 32.5 parts of corundum, 10 parts of aluminum-magnesium spinel, 8 parts of added filler, 6.5 parts of coordination additive, 5.5 parts of magnesia powder, 4 parts of alumina, and 2 parts of binder; Step 2: Mix the above raw materials thoroughly, and then perform molding process at a molding pressure of 50 MPa for 1 hour; Step three, sintering the formed product for another 3 hours at a sintering temperature of 1550° C., and completing the sintering to obtain an alumina-magnesia spinel brick material.

[0049] In this embodiment, the particle size of the corundum is 0.55 mm; the particle size of the magnesia powder is 0.35 mm; the particle size of the alumina is 0.015 mm; the particle size of the alumina-magnesium spinel is 0.35 mm; and the binder is a pulp solution.

[0050] The preparation method of the added filler of this embodiment is: S01: Stir the calcium sulfate whiskers thoroughly in a sufficient amount of 5% by mass hydrogen peroxide solution, then wash, filter and dry; Sodium carboxymethyl cellulose, 5% by mass lanthanum chloride solution and nano-silica sol are fully mixed in a weight ratio of 2.5:6:1 to obtain sodium carboxymethyl cellulose solution; S02: Stirring the dried calcium sulfate whiskers and sodium carboxymethyl cellulose solution in a weight ratio of 3:5 to obtain a calcium sulfate whisker solution; S03: Preparation of filler: S031: 2.5 parts by weight of a boron nitride modifier and 2 parts by weight of a urea solution are mixed and added into 6.5 parts by weight of a 5% dopamine hydrochloride solution, and stirred evenly to obtain a reconstituted solution; S032: 4 parts by weight of barium sulfate, 6.5 parts by weight of sodium dodecylbenzene sulfonate solution and 2.5 parts by weight of sodium alginate are mixed to obtain a barium sulfate solution; The reconstitution liquid and the barium sulfate liquid were subjected to ultrasonic treatment in a weight ratio of 4:3, and finally filtered and dried to obtain a filler; S04: Calcium sulfate whisker solution and filler are mixed and ball-milled in a weight ratio of 5:3 at a ball-milling speed of 1000 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain the added filler.

[0051] The mass fraction of the sodium dodecylbenzene sulfonate solution in this embodiment is 4%; the mass fraction of the urea solution is 3%.

[0052] The ultrasonic treatment in S032 of this embodiment is performed with an ultrasonic power of 320 W and ultrasonic treatment for 2 h.

[0053] The preparation method of the boron nitride modifier of this embodiment is: 4 parts by weight of boron nitride and 2.5 parts by weight of zirconia are added to 6.5 parts by weight of yttrium nitrate solution, and then 2.5 parts by weight of calcium titanate are added. After thorough blending, filtration is carried out and then drying is done. Then, sintering is carried out at 175 °C for 1 h. After sintering is completed, ball milling is carried out through a 100-mesh sieve to obtain a boron nitride modifier.

[0054] The mass fraction of the yttrium nitrate solution in this example is 3%.

[0055] The preparation method of the coordination additive in this example is as follows: S101: Clay and titanium oxide are added to barium nitrate solution and blended thoroughly to obtain a coordination liquid; the mass ratio of clay, titanium oxide and barium nitrate solution is 3:1:5.5; S102: 5 parts by weight of cordierite and 3.5 parts by weight of mica powder are blended and added to 6.5 parts by weight of sodium lignosulfonate solution, and then 1.5 parts by weight of silane coupling agent KH550 is added. After thorough blending, a cordierite liquid is obtained; The cordierite liquid and the coordination liquid are ultrasonically treated according to a weight ratio of 3:5. After ultrasonic treatment is completed, filtration is carried out and then drying is done to obtain a coordination additive.

[0056] The mass fraction of the barium nitrate solution in this example is 3.5%; the mass fraction of the sodium lignosulfonate solution is 6.5%; the ultrasonic power of the ultrasonic treatment is 475 W, and ultrasonic treatment is carried out for 1 h.

[0057] The production process of a kind of aluminum-magnesium spinel brick material in this example is applied in the preparation of aluminum-magnesium spinel bricks.

[0058] Comparative Example 1 The difference from Example 3 is that no added filler is added.

[0059] Comparative Example 2 The difference from Example 3 is that calcium sulfate whisker liquid is not added in the preparation of the added filler.

[0060] Comparative Example 3 The difference from Example 3 is that dry calcium sulfate whiskers are not added to the calcium sulfate whisker liquid.

[0061] Comparative Example 4 The difference from Example 3 is that no filler is added in the preparation of the added filler.

[0062] Comparative Example 5. The difference from Example 3 is that no compounding liquid is added to the filler.

[0063] Comparative Example 6 The difference from Example 3 is that no boron nitride modifier is added to the compounding liquid.

[0064] Comparative Example 7 Different from Example 3, barium sulfate solution was not added to the complexing solution.

[0065] Comparative Example 8 Different from Example 3, the coordination additive was not added.

[0066] Comparative Example 9 Different from Example 3, cordierite solution was not added to the coordination additive.

[0067] Comparative Example 10 Different from Example 3, cordierite and mica powder were not added to the cordierite solution.

[0068] Comparative Example 11 Different from Example 3, the coordination solution was not added to the coordination additive.

[0069] Comparative Example 12 Different from Example 3, clay and titanium oxide were not added to the coordination solution.

[0070] Under normal conditions, the apparent porosity performance, abrasion resistance and compressive strength of the products of Examples 1 - 3 and Comparative Examples 1 - 12 were tested. At the same time, the water resistance and thermal stability (the products were immersed in water for 24 h, then placed at 110 °C for 24 h, and then placed at -5 °C for 24 h. The above was one cycle, and the cycle was repeated 10 times) were tested. The performance measurement results are as follows:

[0071] It can be concluded from Examples 1 - 3 and Comparative Examples 1 - 12 that Under normal conditions, the products of Example 3 of the present invention have excellent performance effects in terms of apparent porosity performance, abrasion resistance and compressive strength, and significant effects in terms of water resistance and thermal stability; When a filler or one of the coordination additives is not added to the product, the performance effect of the product deteriorates significantly. By using the two in coordination, the coordination effect is enhanced, and the performance effect of the product is improved significantly; When calcium sulfate whisker solution is not added during the preparation of the doped filler, dry calcium sulfate whiskers are not added to the calcium sulfate whisker solution, filler is not added during the preparation of the doped filler, the complexing solution is not added to the filler, boron nitride modifier is not added to the complexing solution, and barium sulfate solution is not added to the complexing solution, the performance of the product shows a deteriorating trend to varying degrees. Only the doped filler prepared by the specific method of the present invention in combination with the calcium sulfate whisker solution has the most significant performance effect. In addition, when the boron nitride modifier is not added to the complexing solution, the performance of the product also shows a relatively obvious deteriorating trend; When cordierite liquid is not added to the coordination additive, cordierite is not added to the cordierite liquid, mica powder is not added, coordination liquid is not added to the coordination additive, clay and titanium oxide are not added to the coordination liquid, the performance of the product shows a deteriorating trend. The performance effect of the coordination additive made of the cordierite liquid and the coordination liquid obtained by the method of the present invention is the most significant.

[0072] Since the boron nitride modifier has a great influence on the performance of the product, further research is carried out on this: The preparation method of the boron nitride modifier is as follows: 4 parts by weight of boron nitride and 2.5 parts by weight of zirconium oxide are added to 6.5 parts by weight of yttrium nitrate solution, then 2.5 parts by weight of calcium titanate are added, and they are thoroughly blended. Then, filtration and drying are carried out, and then sintering is carried out at 175 °C for 1 h. After the sintering is completed, ball milling is carried out through 100 meshes to obtain the boron nitride modifier.

[0073] The mass fraction of the yttrium nitrate solution in this example is 3%.

[0074] Experimental Example 1 It is the same as Example 3, except that calcium titanate is not added in the preparation of the boron nitride modifier.

[0075] Experimental Example 2 It is the same as Example 3, except that zirconium oxide is not added in the preparation of the boron nitride modifier.

[0076] Experimental Example 3 It is the same as Example 3, except that boron nitride is not added in the preparation of the boron nitride modifier.

[0077] Experimental Example 4 It is the same as Example 3, except that water is used instead of the yttrium nitrate solution in the preparation of the boron nitride modifier.

[0078] The product performance tests of Experimental Examples 1-4 are as follows:

[0079] It can be seen from Experimental Examples 1-4 that when boron nitride is not added in the preparation of the boron nitride modifier, the performance of the product deteriorates significantly. At the same time, when calcium titanate, zirconium oxide are not added in the preparation of the boron nitride modifier and water is used instead of the yttrium nitrate solution, the performance of the product shows a deteriorating trend to varying degrees. Therefore, when boron nitride is combined with specific raw materials such as calcium titanate and zirconium oxide of the present invention, the performance effect of the product is the most significant, and using other methods instead is not as obvious as the effect of the present invention.

[0080] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

[0081] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A production process of alumina-magnesia spinel brick material, characterized in that: The following steps are involved: Step 1: weigh the raw materials according to weight: 30-35 parts of corundum, 8-12 parts of aluminum-magnesium spinel, 6-10 parts of added filler, 5-8 parts of coordination additive, 4-7 parts of magnesia powder, 3-5 parts of alumina, 1-3 parts of binder; Step 2: Mix the above raw materials thoroughly, and then perform molding process at a molding pressure of 50 MPa for 1 hour; Step three, sintering the formed product for another 2-4 hours at a sintering temperature of 1500-1600°C, and after sintering, obtaining an alumina-magnesia spinel brick material.

2. The production process of alumina-magnesia spinel brick material according to claim 1, characterized in that: The particle size of the corundum is 0.5-0.6 mm; the particle size of the magnesia powder is 0.3-0.4 mm; the particle size of the alumina is 0.01-0.02 mm; the particle size of the aluminum magnesium spinel is 0.3-0.4 mm; and the binder is a pulp solution.

3. The production process of alumina-magnesia spinel brick material according to claim 1, characterized in that: The preparation method of the added filler is: S01: Stir the calcium sulfate whiskers thoroughly in a sufficient amount of 5% by mass hydrogen peroxide solution, then wash, filter and dry; Sodium carboxymethyl cellulose, 5% by mass lanthanum chloride solution and nano-silica sol are fully mixed in a weight ratio of (2-3): (5-7): 1 to obtain sodium carboxymethyl cellulose solution; S02: Stirring the dried calcium sulfate whiskers and sodium carboxymethyl cellulose solution in a weight ratio of 3:5 to obtain a calcium sulfate whisker solution; S03: Preparation of filler: S031: 2-3 parts by weight of a boron nitride modifier and 1-3 parts by weight of a urea solution are mixed and added into 5-8 parts by weight of a 5% dopamine hydrochloride solution, and stirred evenly to obtain a polyadjusted solution; S032: 3-5 parts by weight of barium sulfate, 5-8 parts by weight of sodium dodecylbenzene sulfonate solution and 2-3 parts by weight of sodium alginate are mixed to obtain a barium sulfate solution; The reconstitution liquid and the barium sulfate liquid were subjected to ultrasonic treatment in a weight ratio of 4:3, and finally filtered and dried to obtain a filler; S04: Calcium sulfate whisker solution and filler are mixed and ball-milled in a weight ratio of 5:3 at a ball-milling speed of 1000 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain the added filler.

4. The production process of alumina-magnesia spinel brick material according to claim 3, characterized in that: The mass fraction of the sodium dodecylbenzene sulfonate solution is 3-5%; the mass fraction of the urea solution is 2-4%.

5. The production process of alumina-magnesia spinel brick material according to claim 3, characterized in that: The ultrasonic treatment in S032 has an ultrasonic power of 300-350 W and is performed for 2 h.

6. The production process of alumina-magnesia spinel brick material according to claim 3, characterized in that: The preparation method of the boron nitride modifier is: 3-5 parts by weight of boron nitride and 2-3 parts by weight of zirconium oxide are added to 5-8 parts by weight of yttrium nitrate solution, followed by adding 2-3 parts by weight of calcium titanate, blending thoroughly, then filtering and drying, and sintering at 170-180°C for 1h. After sintering, ball milling through 100 meshes is performed to obtain a boron nitride modifier.

7. The production process of alumina-magnesia spinel brick material according to claim 6, characterized in that: The mass fraction of the yttrium nitrate solution is 2-4%.

8. The production process of alumina-magnesia spinel brick material according to claim 1, characterized in that: The preparation method of the coordination additive is: S101: adding clay and titanium oxide to a barium nitrate solution and mixing them thoroughly to obtain a coordinated solution; wherein the mass ratio of clay, titanium oxide and barium nitrate solution is (2-4):1:(4-7); S102: 4-6 parts by weight of cordierite and 3-4 parts by weight of mica powder are blended and added to 5-8 parts by weight of sodium lignin sulfonate solution, and then 1-2 parts by weight of silane coupling agent KH550 are added and blended sufficiently to obtain cordierite liquid; The cordierite liquid and the coordination liquid were ultrasonically treated in a weight ratio of 3:

5. After the ultrasonic treatment was completed, the coordination additive was filtered and dried to obtain the coordination additive.

9. The production process of alumina-magnesia spinel brick material according to claim 8, characterized in that: The mass fraction of the barium nitrate solution is 2-5%; the mass fraction of the sodium lignin sulfonate solution is 5-8%; the ultrasonic power of the ultrasonic treatment is 450-500W, and the ultrasonic treatment is performed for 1 hour.

10. Application of the production process of an alumina-magnesia spinel brick material according to any one of claims 1 to 9 in the preparation of alumina-magnesia spinel bricks.

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