CN112028641B - Solid-melt Ti (C, N) baking-free silicon mullite brick and preparation method thereof - Google Patents
Solid-melt Ti (C, N) baking-free silicon mullite brick and preparation method thereof Download PDFInfo
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Abstract
The invention provides a solid-melting Ti (C, N) baking-free silicon mullite brick and a preparation method thereof. The baking-free silicon mullite brick is prepared from the following components in percentage by weight: 72-85% of solid-solution Ti (C, N) fused mullite, 1-5% of silicon carbide, 5-15% of calcined alumina powder and 3-8% of combined clay; and a bonding agent accounting for 3-5% of the total weight of the components is added. The baking-free silicon mullite brick takes the electrofused mullite with solid-dissolved Ti (C, N) as a main raw material, is produced and prepared by using low-grade bauxite, avoids the consumption of high-grade bauxite resources, can fully utilize the low-grade bauxite resources rich in resources, and has outstanding performance; the silicon mullite brick is processed at low temperature in the preparation process without high-temperature sintering, shortens the production period, reduces the production cost and avoids the discharge of pollutants in the high-temperature process compared with the traditional preparation of the silicon mullite brick, thereby being beneficial to environmental protection and the comprehensive utilization of bauxite and having obvious social and economic benefits.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a solid-melt Ti (C, N) baking-free silicon mullite brick and a preparation method thereof.
Background
China has an extremely thick bauxite resource, and the proven reserves are about billions of tons, and the bauxite resource occupies the first place in the world. However, more than 70% of the ores are medium and low grade ores, so that the utilization rate of ore resources is very low, a large amount of the medium and low grade ores are discarded in the mining process, and the resource waste phenomenon is very serious.
The traditional silicon mullite brick is formed by sintering high-alumina bauxite clinker and silicon carbide serving as raw materials at high pressure and high temperature, has the excellent performances of high strength, wear resistance, excellent thermal shock stability and the like, and has the characteristics of continuously oxidizing the silicon carbide to form a protective layer, reducing ring formation and the like in the use process. The silicon mullite brick is mainly used for the transition zone of a cement kiln, a decomposing furnace, a grate cooler and other parts. Therefore, the production of the traditional silicon mullite brick needs a large amount of bauxite chamotte which is mainly calcined from natural bauxite. Therefore, along with the large consumption of refractory materials, the large consumption of silicon mullite bricks and the high-speed development of alumina production, bauxite resources in China are increasingly deficient, and particularly the contradiction between high-alumina and rich ore supply is prominent. And the currently used silicon mullite bricks need to be fired at high temperature, so that the energy consumption is increased and certain influence on the environment can be caused in the firing process.
Disclosure of Invention
Aiming at the problems, the invention provides a solid-melting Ti (C, N) baking-free silicon mullite brick and a preparation method thereof. The baking-free silicon mullite brick takes the electrofused mullite with Ti (C, N) dissolved in solid as a main raw material, is produced and prepared by using the low-grade bauxite, avoids the consumption of high-grade bauxite resources, can fully utilize the low-grade bauxite resources rich in resources, has outstanding performance, and has good social and economic benefits.
The invention is realized by the following technical scheme
A solid-melt Ti (C, N) baking-free silicon mullite brick is prepared from the following components in percentage by weight: solid solution Ti (C, N) electrofused mullite 72-85%, silicon carbide 1-5%, calcined alumina powder 5-15%, and bonded clay 3-8%; and adding a bonding agent accounting for 3-5% of the total weight of the components.
Further, the mass percentage content of SiC in the silicon carbide is more than or equal to 90%, and the granularity of the silicon carbide is preferably 80-200 meshes.
Further, the silicon carbide includes 90 silicon carbide, 93 silicon carbide, and 97 silicon carbide.
Further, Al in the calcined alumina powder 2 O 3 The mass percentage content of the composite is more than or equal to 99 percent, and the granularity is 500 meshes.
Further, the combined clay is fine powder with the granularity of 180-200 meshes.
Further, Al in the solid-solution Ti (C, N) electrofused mullite 2 O 3 65-75% of SiO 2 15-25% of TiO 2 5-8% of Fe 2 O 3 The content is less than or equal to 0.5 percent, and the volume density is more than or equal to 3.0g/cm 3 。
Further, the mass percentage content distribution of different granularities of the solid-solution Ti (C, N) fused mullite is as follows: 10% of 3-5 mm, 35% of 1-3 mm, 20% of 0-1 mm and 15% of 200 meshes.
Further, the bonding agent is aluminum dihydrogen phosphate, and the specific gravity of the bonding agent is 1.3-1.5.
The preparation method of the solid-melt Ti (C, N) baking-free silicon mullite brick comprises the following steps:
(1) weighing the raw materials according to the requirements;
(2) placing the solid-solution Ti (C, N) electrofused mullite fine powder, calcined alumina powder, silicon carbide and combined clay into a premixer for premixing for not less than 30 minutes to obtain premixed powder;
(3) placing the solid-dissolved Ti (C, N) electrofused mullite granules into a mixing roll to mix for 1-3 minutes, then adding a bonding agent to mix for 3-5 minutes, then adding the premixed powder obtained in the step a, and mixing for 10-15 minutes to obtain a mixed material;
(4) adding the mixed material obtained in the step (3) into an assembled die, and pressing and forming by adopting a press machine to obtain a green brick (preferably a 630-ton or 1000-ton press machine);
(5) and (4) drying the green brick formed in the step (4), and then treating at low temperature to obtain the solid-melt Ti (C, N) baking-free silicon mullite brick.
Further, the drying is carried out for 45-50 hours at 110 ℃ until the residual moisture is less than 1.5%; the low-temperature treatment comprises the following steps: and preserving the heat of the dried green brick for 8-12 hours at 500-600 ℃.
Further, the premixer is preferably a double-helix premixer.
Further, the mixer is preferably an intensive mixer.
Further, the press is preferably a 630-ton or 1000-ton press.
Compared with the prior art, the invention has the following positive beneficial effects
The invention obtains the baking-free silicon mullite brick by using solid-solution Ti (C, N) electrofused mullite as a main raw material and adopting phosphate combination and low-temperature treatment. The Ti (CN) mullite is prepared from medium and low grade high bauxite, so that the performance requirements of the mullite brick can be met, the consumption of the high grade high bauxite and the waste of low grade high bauxite resources are reduced, and the production cost is reduced. Under the action of Ti (C, N) with the characteristics of high melting point, high strength and hardness, high wear resistance, high heat conductivity, high corrosion resistance and the like, the prepared baking-free silicon mullite brick has high strength, low air holes and good thermal shock stability and wear resistance, and the product performance can be comparable to that of a common silicon mullite brick;
meanwhile, the silicon mullite brick can also replace a certain amount of silicon carbide, so that the production cost is further reduced, the alkali penetration is reduced, the corrosion of alkali on a rotary kiln cylinder is further reduced, and the safety performance of the kiln body is improved;
in the preparation process, the silicon mullite brick prepared by the invention is processed at low temperature without high-temperature firing, shortens the production period, reduces the production cost and avoids the discharge of pollutants in the high-temperature process compared with the traditional firing preparation of the silicon mullite brick, thereby being beneficial to environmental protection and the comprehensive utilization of bauxite and having obvious social and economic benefits.
Detailed Description
The present invention will be described in more detail with reference to the following embodiments, which are provided for understanding the technical solutions of the present invention, but are not intended to limit the scope of the present invention.
The twin-screw premixer used in the following examples was a VSH-2C/B twin-screw conical stirrer available from Shanghai Shenyin machines (group) Ltd; the adopted powerful mixing mill is an R19 inclined powerful mixing mill which is purchased from Jianghu Shenjiang machinery Co., Ltd; the press used was an electric screw press of type HLDS-630T/B, available from Zhengzhou Hualong machines Co., Ltd.
The adopted solid-melting Ti (C, N) electrofused mullite is purchased from Beijing Chan Union Dacheng trading Co Ltd; the silicon carbide is classified into 90 silicon carbide (200 meshes, SiC 90.67%, New materials science and technology Co., Ltd. of Taihe, Gansu), 93 silicon carbide (200 meshes, SiC 93.56%, Zhengzhou Fumante import and export trade Co., Ltd.), and 97 silicon carbide (200 meshes, SiC 97.08%, Chengyi City Yuanlong industry and trade Co., Ltd.); binding clay: al (Al) 2 O 3 31.87％、Fe 2 O 3 2.15 percent, 200 meshes, Wuhan architecture materials Co., Ltd, Consortium division; calcined alumina powder is Kaifeng and Forming inorganic non-Material Co.
Example 1
A solid-melt Ti (C, N) baking-free silicon mullite brick is prepared from the following components in percentage by weight: 80% of solid-melting Ti (C, N) electrofused mullite, 2% of 90 silicon carbide, 10% of calcined alumina powder and 8% of bonding clay; wherein the fused mullite is 10 percent in a thickness of 3-5 mm, 35 percent in a thickness of 1-3 mm, 20 percent in a thickness of 0-1 mm and 15 percent in a thickness of 200 meshes. Aluminum dihydrogen phosphate (the specific gravity is 1.38) accounting for 3.2 percent of the total weight of the components is additionally added.
The indexes of the solid-melting Ti (C, N) electrofused mullite are as follows: al (Al) 2 O 3 71.32％、SiO 2 20.02％、Fe 2 O 3 0.49％、TiO 2 6.09 percent and the volume density of the powder is 3.15g/m 3 ；
The preparation method of the solid-melt Ti (C, N) baking-free silicon mullite brick comprises the following steps:
(1) weighing the raw materials according to the proportion, placing 15kg of fused mullite, 2kg of silicon carbide, 8kg of combined clay and 10kg of calcined alumina powder as fine powder raw materials into a double-helix premixer for premixing for 35 minutes to obtain premixed powder;
(2) putting 65kg of the raw material granules of the electrofused mullite into a powerful mixing roll to mix for 2 minutes, then adding 3.2kg of aluminum dihydrogen phosphate to mix for 4 minutes, adding the premixed powder in the step (1) to mix for 12 minutes to obtain a mixed material;
(3) adding the mixed material obtained in the step (2) into an assembled die, and pressing and forming by adopting a 630-ton press to obtain a green brick;
(4) and (4) drying the green bricks formed in the step (3), treating at the low temperature of 500-600 ℃, and preserving the heat for 10 hours to obtain the solid-melting Ti (C, N) unburned silicon mullite bricks.
Example 2
A solid-melt Ti (C, N) baking-free silicon mullite brick is prepared from the following components in percentage by weight: 80% of solid-melting Ti (C, N) electrofused mullite, 2% of 93 silicon carbide, 10% of calcined alumina powder and 8% of bonding clay; wherein the fused mullite is 10 percent in a thickness of 3-5 mm, 35 percent in a thickness of 1-3 mm, 20 percent in a thickness of 0-1 mm and 15 percent in a thickness of 200 meshes. Aluminum dihydrogen phosphate (the specific gravity is 1.38) accounting for 3.2 percent of the total weight of the components is additionally added.
The indexes of the solid-solution Ti (C, N) electrofused mullite are as follows: al (aluminum) 2 O 3 71.32％、SiO 2 20.02％、Fe 2 O 3 0.49％、TiO 2 6.09 percent and the volume density is 3.15g/m 3 。
The preparation method of the solid-melt Ti (C, N) baking-free silicon mullite brick comprises the following steps:
(1) weighing the raw materials according to the proportion, placing 15kg of fused mullite, 2kg of silicon carbide, 8kg of combined clay and 10kg of calcined alumina powder as fine powder raw materials into a double-helix premixer for premixing for 35 minutes to obtain premixed powder;
(2) putting 65kg of the raw material granules of the electrofused mullite into a powerful mixing roll to mix for 2 minutes, then adding 3.2kg of aluminum dihydrogen phosphate to mix for 4 minutes, adding the premixed powder in the step (1) to mix for 12 minutes to obtain a mixed material;
(3) adding the mixed material obtained in the step (2) into an assembled die, and performing compression molding by adopting a 630-ton press machine to obtain a green brick;
(4) and (4) drying the green bricks formed in the step (3), treating at the low temperature of 500-600 ℃, and preserving the heat for 10 hours to obtain the solid-melting Ti (C, N) unburned silicon mullite bricks.
Example 3
A solid-melting Ti (C, N) baking-free silicon mullite brick is prepared from the following components in percentage by weight: al (Al) 2 O 3 80% of fused mullite with the content of 70%, 2% of 97 silicon carbide, 10% of calcined alumina powder and 8% of combined clay; wherein the fused mullite is 10 percent in a thickness of 3-5 mm, 35 percent in a thickness of 1-3 mm, 20 percent in a thickness of 0-1 mm and 15 percent in a thickness of 200 meshes. Aluminum dihydrogen phosphate (specific gravity 1.38) accounting for 3.2 percent of the total weight of the components is additionally added.
The indexes of the solid-melting Ti (C, N) electrofused mullite are as follows: al (Al) 2 O 3 71.32％、SiO 2 20.02％、Fe 2 O 3 0.49％、TiO 2 6.09 percent and the volume density of the powder is 3.15g/m 3 。
The preparation method of the solid-melt Ti (C, N) baking-free silicon mullite brick comprises the following steps:
(1) weighing the raw materials according to the proportion, placing 15kg of fused mullite, 2kg of silicon carbide, 8kg of combined clay and 10kg of calcined alumina powder as fine powder raw materials into a double-helix premixer for premixing for 35 minutes to obtain premixed powder;
(2) putting 65kg of the raw material granules of the electrofused mullite into a powerful mixing roll to mix for 2 minutes, then adding 3.2kg of aluminum dihydrogen phosphate to mix for 4 minutes, adding the premixed powder in the step (1) to mix for 12 minutes to obtain a mixed material;
(3) adding the mixed material obtained in the step (2) into an assembled die, and pressing and forming by adopting a 630-ton press to obtain a green brick;
(4) and (4) drying the green bricks formed in the step (3), treating at the low temperature of 500-600 ℃, and preserving the heat for 10 hours to obtain the solid-melting Ti (C, N) unburned silicon mullite bricks.
Example 4
A solid-melt Ti (C, N) baking-free silicon mullite brick is prepared from the following components in percentage by weight: 80% of solid-melting Ti (C, N) electrofused mullite, 2% of 90 silicon carbide, 10% of calcined alumina powder and 8% of bonding clay; wherein the fused mullite is 10 percent in a thickness of 3-5 mm, 35 percent in a thickness of 1-3 mm, 20 percent in a thickness of 0-1 mm and 15 percent in a thickness of 200 meshes. Aluminum dihydrogen phosphate (the specific gravity is 1.38) accounting for 3.2 percent of the total weight of the components is additionally added.
The technical indexes of the solid-melting Ti (C, N) electrofused mullite are as follows: al (Al) 2 O 3 75.86％、SiO 2 16.02％、Fe 2 O 3 0.39％、TiO 2 6.29 percent and the volume density of 3.19g/m 3 。
The preparation method of the solid-melt Ti (C, N) baking-free silicon mullite brick comprises the following steps:
(1) weighing the raw materials according to the proportion, placing 15kg of fused mullite, 2kg of silicon carbide, 8kg of combined clay and 10kg of calcined alumina powder as fine powder raw materials into a double-helix premixer for premixing for 35 minutes to obtain premixed powder;
(2) putting 65kg of the raw material granules of the electrofused mullite into a powerful mixing roll to mix for 2 minutes, then adding 3.2kg of aluminum dihydrogen phosphate to mix for 4 minutes, adding the premixed powder in the step (1) to mix for 12 minutes to obtain a mixed material;
(3) adding the mixed material obtained in the step (2) into an assembled die, and pressing and forming by adopting a 630-ton press to obtain a green brick;
(4) and (4) drying the green brick formed in the step (3), treating at the low temperature of 500-600 ℃, and preserving heat for 10 hours to obtain the solid-melting Ti (C, N) unburned silicon mullite brick.
Example 5
A solid-melt Ti (C, N) baking-free silicon mullite brick is prepared from the following components in percentage by weight: 80% of solid-melting Ti (C, N) electrofused mullite, 2% of 93 silicon carbide, 10% of calcined alumina powder and 8% of bonding clay; wherein the fused mullite is 10 percent in a thickness of 3-5 mm, 35 percent in a thickness of 1-3 mm, 20 percent in a thickness of 0-1 mm and 15 percent in a thickness of 200 meshes. Aluminum dihydrogen phosphate (the specific gravity is 1.38) accounting for 3.2 percent of the total weight of the components is additionally added.
The technical indexes of the solid-melting Ti (C, N) electrofused mullite are as follows: al (Al) 2 O 3 75.86％、SiO 2 16.02％、Fe 2 O 3 0.39％、TiO 2 6.29 percent and the volume density of 3.19g/m 3 。
The preparation method of the solid-melt Ti (C, N) baking-free silicon mullite brick comprises the following steps:
(1) weighing the raw materials according to the proportion, placing 15kg of fused mullite, 2kg of silicon carbide, 8kg of combined clay and 10kg of calcined alumina powder as fine powder raw materials into a double-helix premixer for premixing for 35 minutes to obtain premixed powder;
(2) putting 65kg of the raw material granules of the electrofused mullite into a powerful mixing roll to mix for 2 minutes, then adding 3.2kg of aluminum dihydrogen phosphate to mix for 4 minutes, adding the premixed powder in the step (1) to mix for 12 minutes to obtain a mixed material;
(3) adding the mixed material obtained in the step (2) into an assembled die, and performing compression molding by adopting a 630-ton press machine to obtain a green brick;
(4) and (4) drying the green brick formed in the step (3), treating at the low temperature of 500-600 ℃, and preserving heat for 10 hours to obtain the solid-melting Ti (C, N) unburned silicon mullite brick.
Example 6
A solid-melt Ti (C, N) baking-free silicon mullite brick is prepared from the following components in percentage by weight: 80% of solid-melting Ti (C, N) electrofused mullite, 2% of 97 silicon carbide, 10% of calcined alumina powder and 8% of bonding clay; wherein the fused mullite is 10 percent in a thickness of 3-5 mm, 35 percent in a thickness of 1-3 mm, 20 percent in a thickness of 0-1 mm and 15 percent in a thickness of 200 meshes. Aluminum dihydrogen phosphate (the specific gravity is 1.38) accounting for 3.2 percent of the total weight of the components is additionally added.
The technical indexes of the solid-melting Ti (C, N) electrofused mullite are as follows: al (Al) 2 O 3 75.86％、SiO 2 16.02％、Fe 2 O 3 0.39％、TiO 2 6.29 percent and the volume density of 3.19g/m 3 。
The preparation method of the solid-melt Ti (C, N) baking-free silicon mullite brick comprises the following steps:
(1) weighing the raw materials according to the proportion, placing 15kg of fused mullite, 2kg of silicon carbide, 8kg of combined clay and 10kg of calcined alumina powder as fine powder raw materials into a double-helix premixer for premixing for 35 minutes to obtain premixed powder;
(2) putting 65kg of the raw material granules of the electrofused mullite into a powerful mixing roll to mix for 2 minutes, then adding 3.2kg of aluminum dihydrogen phosphate to mix for 4 minutes, adding the premixed powder in the step (1) to mix for 12 minutes to obtain a mixed material;
(3) adding the mixed material obtained in the step (2) into an assembled die, and pressing and forming by adopting a 630-ton press to obtain a green brick;
(4) and (4) drying the green brick formed in the step (3), treating at the low temperature of 500-600 ℃, and preserving heat for 10 hours to obtain the solid-melting Ti (C, N) unburned silicon mullite brick.
Example 7
A solid-melting Ti (C, N) baking-free silicon mullite brick is prepared from the following components in percentage by weight: 80% of solid-melting Ti (C, N) electrofused mullite, 2% of 90 silicon carbide, 10% of calcined alumina powder and 8% of bonding clay; wherein the fused mullite is 10 percent in a thickness of 3-5 mm, 35 percent in a thickness of 1-3 mm, 20 percent in a thickness of 0-1 mm and 15 percent in a thickness of 200 meshes. Aluminum dihydrogen phosphate (specific gravity 1.38) accounting for 3.2 percent of the total weight of the components is additionally added.
The technical indexes of the solid-melting Ti (C, N) electrofused mullite are as follows: al (Al) 2 O 3 66.41％、SiO 2 25.22％、Fe 2 O 3 0.39％、TiO 2 5.69 percent and the volume density of 3.09g/m 3 。
The preparation method of the solid-melt Ti (C, N) baking-free silicon mullite brick comprises the following steps:
(1) weighing the raw materials according to the proportion, placing 15kg of fused mullite, 2kg of silicon carbide, 8kg of combined clay and 10kg of calcined alumina powder as fine powder raw materials into a double-helix premixer for premixing for 35 minutes to obtain premixed powder;
(2) putting 65kg of the raw material granules of the electrofused mullite into a powerful mixing roll to mix for 2 minutes, then adding 3.2kg of aluminum dihydrogen phosphate to mix for 4 minutes, adding the premixed powder in the step (1) to mix for 12 minutes to obtain a mixed material;
(3) adding the mixed material obtained in the step (2) into an assembled die, and pressing and forming by adopting a 630-ton press to obtain a green brick;
(4) and (4) drying the green brick formed in the step (3), treating at the low temperature of 500-600 ℃, and preserving heat for 10 hours to obtain the solid-melting Ti (C, N) unburned silicon mullite brick.
Example 8
A solid-melting Ti (C, N) baking-free silicon mullite brick is prepared from the following components in percentage by weight: 80% of solid-melting Ti (C, N) electrofused mullite, 2% of 93 silicon carbide, 10% of calcined alumina powder and 8% of bonding clay; wherein the fused mullite is 10 percent in a thickness of 3-5 mm, 35 percent in a thickness of 1-3 mm, 20 percent in a thickness of 0-1 mm and 15 percent in a thickness of 200 meshes. Aluminum dihydrogen phosphate (specific gravity 1.38) accounting for 3.2 percent of the total weight of the components is additionally added.
The technical indexes of the solid-melting Ti (C, N) electrofused mullite are as follows: al (Al) 2 O 3 66.41％、SiO 2 25.22％、Fe 2 O 3 0.39％、TiO 2 5.69 percent and the volume density of 3.09g/m 3 。
The preparation method of the solid-melt Ti (C, N) baking-free silicon mullite brick comprises the following steps:
(1) weighing the raw materials according to the proportion, placing 15kg of fused mullite, 2kg of silicon carbide, 8kg of combined clay and 10kg of calcined alumina powder as fine powder raw materials into a double-helix premixer for premixing for 35 minutes to obtain premixed powder;
(2) putting 65kg of the raw material granules of the electrofused mullite into a powerful mixing roll to mix for 2 minutes, then adding 3.2kg of aluminum dihydrogen phosphate to mix for 4 minutes, adding the premixed powder in the step (1) to mix for 12 minutes to obtain a mixed material;
(3) adding the mixed material obtained in the step (2) into an assembled die, and pressing and forming by adopting a 630-ton press to obtain a green brick;
(4) and (4) drying the green bricks formed in the step (3), treating at the low temperature of 500-600 ℃, and preserving the heat for 10 hours to obtain the solid-melting Ti (C, N) unburned silicon mullite bricks.
Example 9
A solid-melt Ti (C, N) baking-free silicon mullite brick is prepared from the following components in percentage by weight: 80% of solid-melting Ti (C, N) fused mullite, 2% of 97 silicon carbide, 10% of calcined alumina powder and 8% of bonding clay; wherein the fused mullite is 10 percent in a thickness of 3-5 mm, 35 percent in a thickness of 1-3 mm, 20 percent in a thickness of 0-1 mm and 15 percent in a thickness of 200 meshes. Aluminum dihydrogen phosphate (the specific gravity is 1.38) accounting for 3.2 percent of the total weight of the components is additionally added.
The technical indexes of the solid-melting Ti (C, N) electrofused mullite are as follows: al (Al) 2 O 3 66.41％、SiO 2 25.22％、Fe 2 O 3 0.39％、TiO 2 5.69 percent and the volume density of the powder is 3.09g/m 3 。
The preparation method of the solid-melt Ti (C, N) baking-free silicon mullite brick comprises the following steps:
(1) weighing the raw materials according to the proportion, placing 15kg of fused mullite, 2kg of silicon carbide, 8kg of combined clay and 10kg of calcined alumina powder as fine powder raw materials into a double-helix premixer for premixing for 35 minutes to obtain premixed powder;
(2) putting 65kg of the raw material granules of the electrofused mullite into a powerful mixing roll to mix for 2 minutes, then adding 3.2kg of aluminum dihydrogen phosphate to mix for 4 minutes, adding the premixed powder in the step (1) to mix for 12 minutes to obtain a mixed material;
(3) adding the mixed material obtained in the step (2) into an assembled die, and pressing and forming by adopting a 630-ton press to obtain a green brick;
(4) and (4) drying the green brick formed in the step (3), treating at the low temperature of 500-600 ℃, and preserving heat for 10 hours to obtain the solid-melting Ti (C, N) unburned silicon mullite brick.
Example 10
A solid-melt Ti (C, N) baking-free silicon mullite brick is prepared from the following components in percentage by weight: 80% of solid-melting Ti (C, N) electrofused mullite, 2% of 97 silicon carbide, 10% of calcined alumina powder and 8% of bonding clay; wherein the fused mullite is 10 percent in a thickness of 3-5 mm, 35 percent in a thickness of 1-3 mm, 20 percent in a thickness of 0-1 mm and 15 percent in a thickness of 200 meshes. Aluminum dihydrogen phosphate (the specific gravity is 1.38) accounting for 3.2 percent of the total weight of the components is additionally added.
Technical indexes of solid-melting Ti (C, N) electrofused mullite are as follows: al (Al) 2 O 3 71.32％、SiO 2 20.02％、Fe 2 O 3 0.49％、TiO 2 6.09 percent and the volume density of the powder is 3.15g/m 3 。
The preparation method of the solid-melt Ti (C, N) baking-free silicon mullite brick comprises the following steps:
(1) weighing the raw materials according to the proportion, placing 15kg of fused mullite, 2kg of silicon carbide, 8kg of combined clay and 10kg of calcined alumina powder as fine powder raw materials into a double-helix premixer for premixing for 35 minutes to obtain premixed powder;
(2) putting 65kg of the raw material granules of the electrofused mullite into a powerful mixing roll to mix for 2 minutes, then adding 3.2kg of aluminum dihydrogen phosphate to mix for 4 minutes, adding the premixed powder in the step (1) to mix for 12 minutes to obtain a mixed material;
(3) adding the mixed material obtained in the step (2) into an assembled die, and performing compression molding by adopting a 630-ton press machine to obtain a green brick;
(4) and (4) drying the green brick formed in the step (3), treating at low temperature of 600 ℃, and preserving heat for 8 hours to obtain the solid-melting Ti (C, N) unburned silicon mullite brick.
Example 11
A solid-melt Ti (C, N) baking-free silicon mullite brick is prepared from the following components in percentage by weight: 72% of solid-melting Ti (C, N) electrofused mullite, 5% of 97 silicon carbide, 15% of calcined alumina powder and 8% of bonding clay; wherein the fused mullite is 10 percent in a thickness of 3-5 mm, 35 percent in a thickness of 1-3 mm, 20 percent in a thickness of 0-1 mm and 15 percent in a thickness of 200 meshes. Aluminum dihydrogen phosphate (the specific gravity is 1.38) accounting for 4 percent of the total weight of the components is additionally added.
Technical indexes of solid-melting Ti (C, N) electrofused mullite are as follows: al (Al) 2 O 3 71.32％、SiO 2 20.02％、Fe 2 O 3 0.49％、TiO 2 6.09 percent and the volume density of the powder is 3.15g/m 3 。
The preparation method of the solid-melt Ti (C, N) baking-free silicon mullite brick comprises the following steps:
(1) weighing the raw materials according to the proportion, placing 7kg of fused mullite, 5kg of silicon carbide, 8kg of bonding clay and 15kg of calcined alumina powder as fine powder raw materials into a double-helix premixer for premixing for 35 minutes to obtain premixed powder;
(2) putting 65kg of the raw material particles of the electrofused mullite into a powerful mixing roll to mix for 1.5 minutes, then adding 4.0kg of aluminum dihydrogen phosphate to mix for 3 minutes, adding the premixed powder in the step (1) to mix for 12 minutes to obtain a mixed material;
(3) adding the mixed material obtained in the step (2) into an assembled die, and pressing and forming by adopting a 630-ton press to obtain a green brick;
(4) and (4) drying the green brick formed in the step (3), treating at the low temperature of 500-600 ℃, and preserving heat for 8 hours to obtain the solid-melting Ti (C, N) unburned silicon mullite brick.
Example 12
A solid-melt Ti (C, N) baking-free silicon mullite brick is prepared from the following components in percentage by weight: 85% of solid-melting Ti (C, N) electrofused mullite, 4% of 97 silicon carbide, 7% of calcined alumina powder and 4% of bonding clay; wherein the fused mullite is 10 percent in a thickness of 3-5 mm, 35 percent in a thickness of 1-3 mm, 20 percent in a thickness of 0-1 mm and 15 percent in a thickness of 200 meshes. Aluminum dihydrogen phosphate (the specific gravity is 1.38) accounting for 5 percent of the total weight of the components is additionally added.
Technical indexes of solid-melting Ti (C, N) electrofused mullite are as follows: al (Al) 2 O 3 66.41％、SiO 2 25.22％、Fe 2 O 3 0.39％、TiO 2 5.69 percent and the volume density of 3.09g/m 3 。
The preparation method of the solid-melt Ti (C, N) baking-free silicon mullite brick comprises the following steps:
(1) weighing the raw materials according to the proportion, placing 20kg of electrically fused mullite, 4kg of silicon carbide, 4kg of bonding clay and 7kg of calcined alumina powder as fine powder raw materials into a double-helix premixer for premixing for 35 minutes to obtain premixed powder;
(2) putting 65kg of the raw material particles of the electrofused mullite into a powerful mixing roll to mix for 1.5 minutes, then adding 4.0kg of aluminum dihydrogen phosphate to mix for 3 minutes, adding the premixed powder in the step (1) to mix for 12 minutes to obtain a mixed material;
(3) adding the mixed material obtained in the step (2) into an assembled die, and pressing and forming by adopting a 630-ton press to obtain a green brick;
(4) and (4) drying the green brick formed in the step (3), treating at the low temperature of 500-600 ℃, and preserving heat for 12 hours to obtain the solid-melting Ti (C, N) unburned silicon mullite brick.
The results of testing the properties of the solid-state Ti (C, N) non-fired Si-Moh bricks and the homogenized alumina-based Si-Moh bricks of examples 1-12 are shown in the following tables.
Therefore, the high-alumina bauxite with medium and low grade is adopted to prepare the silicon mullite brick which completely meets the performance requirement, and high-temperature firing is not needed in the preparation process, so that the energy consumption is further reduced, the production cost is reduced, and the influence on the environment is avoided. Has good practical application prospect.
Claims (3)
1. A solid-melting Ti (C, N) baking-free silicon mullite brick is characterized by being prepared from the following components in percentage by weight: solid solution Ti (C, N) electrofused mullite 72-85%, silicon carbide 1-5%, calcined alumina powder 5-15%, and bonded clay 3-8%; a binding agent accounting for 3-5% of the total weight of the components is added;
al in the calcined alumina powder 2 O 3 The mass percentage content of the composite is more than or equal to 99 percent, and the granularity is 500 meshes;
the combined clay is fine powder with the granularity of 180-200 meshes;
the mass percentage distribution of different granularities of the solid-solution Ti (C, N) electrofused mullite is as follows: 10% of 3-5 mm, 35% of 1-3 mm, 20% of 0-1 mm and 15% of 200 meshes;
the bonding agent is aluminum dihydrogen phosphate, and the specific gravity of the bonding agent is 1.3-1.5.
2. The solid-melt Ti (C, N) baking-free SiMOH brick as claimed in claim 1, wherein the SiC content in the silicon carbide is greater than or equal to 90% by mass, and the particle size of the silicon carbide is 80-200 meshes.
3. A method of preparing a solid-melt Ti (C, N) non-fired mullite brick as claimed in any one of claims 1-2, which method comprises the steps of:
(1) weighing the raw materials according to the requirements of claim 1;
(2) placing the solid-solution Ti (C, N) electrofused mullite fine powder, calcined alumina powder, silicon carbide and combined clay into a premixer for premixing for not less than 30 minutes to obtain premixed powder;
(3) placing the solid-dissolved Ti (C, N) electrofused mullite granules into a mixing roll to mix for 1-3 minutes, then adding a bonding agent to mix for 3-5 minutes, then adding the premixed powder obtained in the step (2), and mixing for 10-15 minutes to obtain a mixed material;
(4) adding the mixed material obtained in the step (3) into an assembled die, and performing compression molding by adopting a press machine to obtain a green brick;
(5) drying the green bricks formed in the step (4), and then performing low-temperature treatment to obtain solid-melt Ti (C, N) baking-free silicon mullite bricks;
the drying is carried out for 45-50 hours at the temperature of 110 ℃;
the low-temperature treatment comprises the following steps: and preserving the heat of the dried green brick for 8-12 hours at 500-600 ℃.
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| CN116023155A (en) * | 2022-12-16 | 2023-04-28 | 巩义通达中原耐火技术有限公司 | Alumina-based homogeneous mullite unburned brick for lime rotary kiln and preparation method thereof |
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