CN115947588B - Magnesium-based composite refractory material and preparation method and application thereof - Google Patents
Magnesium-based composite refractory material and preparation method and application thereof Download PDFInfo
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Abstract
A magnesium-based composite refractory material and a preparation method and application thereof belong to the technical field of refractory materials, and the refractory material comprises the following raw materials in parts by weight: 100 parts of modified light burned magnesia, 5-15 parts of dust, 2-4 parts of titanium dioxide fiber, 2-4 parts of modified zirconia fiber and 1-3 parts of coal-based spinning asphalt. The modified light burned magnesia is used as a main material, and the fiber is added for further modification, so that the corrosion resistance, the thermal shock stability and the high-temperature creep resistance are improved, the uniform quality of the material can be ensured, the temperature deviation resistance is not generated, and the use safety is higher. After the refractory bricks are pressed, the normal-temperature compressive strength is more than 120MPa, the creep rate (1400 ℃ multiplied by 60 h) is less than 0.25%, and the high-temperature flexural strength (1400 ℃ for 0.5 h) is more than 60 MPa; the performance of the refractory brick is far superior to that of similar refractory brick products.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a magnesium-based composite refractory material, and a preparation method and application thereof.
Background
The refractory material plays an important role in the high-temperature production operation furnace, and the different raw materials and preparation processes of the refractory lining directly influence the service performance and service life of the kiln and the quality of sintered products in the furnace. The magnesium refractory material is mainly used for basic open hearth furnace, electric furnace bottom and wall, permanent lining of oxygen converter, nonferrous metal smelting furnace, high-temperature tunnel kiln, calcined magnesia brick and cement rotary kiln lining, furnace bottom and wall of heating furnace, glass kiln regenerator lattice brick, etc.
With the increasing quality requirements of various industrial products, the complexity of high-temperature production process changes, the improvement requirement of kiln technology, the increase of the volume scale of the kiln, the change of the environment in the kiln and the like, the requirements on the performance of magnesia refractory materials are continuously raised. For example, in order to increase the yield and the melting efficiency, glass manufacturers can adopt a mode of reducing the granularity of raw materials to enter the furnace, which leads to the increase of the amount of fine powder which enters the regenerator and takes silicon dioxide as a main component, and then the temperature of the process is frequently changed, so that the corrosion in the furnace is aggravated, and higher requirements are put on the thermal shock stability and erosion resistance of refractory materials. For another example, manufacturers may use petroleum coke powder instead of heavy oil or natural gas as fuel to save cost, and the gas generated after combustion may further exacerbate the erosion of the regenerator refractory bricks.
However, the existing magnesite has performance limitations due to the limitation of the purity of magnesite serving as a raw material, for example, the prepared magnesite has the advantages of higher refractoriness and high load softening starting temperature of the magnesite brick, but has poor thermal shock resistance, and has improved erosion resistance and high-temperature deformation resistance. At present, in order to improve the erosion resistance of magnesia refractory materials, chromium oxide is added to form magnesia-chromite to improve the erosion resistance, but the magnesia-chromite spinel has poor high-temperature creep property and is easy to deform and collapse. The titanium oxide, the aluminum oxide, the silicon oxide and the like are added to improve the strength and the thermal shock resistance of the material and the comprehensive performance, but the components are more, the fusion property of the components is poor, the cost is high, the phenomenon of uneven quality easily occurs during mixing, ball pressing or briquetting, and the temperature deviation in the furnace, the furnace penetration and the position fault maintenance in the furnace are frequent.
Disclosure of Invention
Aiming at the problems that the erosion resistance, thermal shock stability, high-temperature creep resistance and the like of the existing pure magnesia refractory material need to be improved, and the composite magnesia material has poor fusion property and difficult quality control. The invention provides a magnesium-based composite refractory material, a preparation method and application thereof, wherein modified magnesia is adopted to improve the fusion property, so that the quality uniformity of the material can be ensured, the temperature-resistant deviation is not generated, and the accidents are reduced while the erosion resistance, the thermal shock stability and the high-temperature creep resistance are improved. The specific technical scheme is as follows:
the magnesium-based composite refractory material comprises the following raw materials in parts by mass: 100 parts of modified light burned magnesia, 5-15 parts of dust, 2-4 parts of titanium dioxide fiber, 2-4 parts of modified zirconia fiber and 1-3 parts of coal-based spinning asphalt.
The modified light burned magnesia is light burned magnesia with zirconia powder and manganese oxide powder embedded in the surface defects of magnesite grains through asphalt bonding; in the modified light burned magnesia, magnesite sand particles are zirconia powder, manganese oxide powder and asphalt=100 (1.5-4) (0.1-0.3).
The dust is generated when large crystal magnesite is produced.
The median granularity of the coal-based spinning asphalt is 2-6 um.
The modified zirconia fiber is zirconia fiber coated with alumina on the surface; the diameter of the modified zirconia fiber is 0.05-0.15 mm, and the length is 0.5-1.5 mm.
The diameter of the titanium dioxide fiber is 0.05-0.15 mm, and the length is 0.5-1.5 mm.
The preparation method of the magnesium-based composite refractory material comprises the following steps:
s1: mixing 2-4 parts of titanium dioxide fibers and 2-4 parts of modified zirconia fibers, and then adding 1-3 parts of coal-based spinning asphalt for uniform mixing to prepare composite auxiliary materials;
s2: adding composite auxiliary materials into 100 parts of modified light burned magnesia, performing ball milling and mixing, and then performing heating modification treatment to obtain modified materials;
the ball milling mixing time is 30-40 min; the stirring speed of the heating modification treatment is 60-100 r/min, the heating temperature is 360-380 ℃, and the modification time is 2-2.5 h;
s3: adding 5-15 parts of dust into the modified material for uniform mixing, then pressing into balls, drying, and calcining in a furnace to obtain the magnesium-based composite refractory material;
the calcination temperature is 1200-1400 ℃, and the calcination time is 3-4 h.
The magnesium-based composite refractory material is applied to preparation of refractory bricks or ramming material lining materials, and is suitable for kiln treatment environments with high curvature of high-low temperature change, frequent temperature fluctuation caused by smoke and air alternation and high aggressiveness.
Compared with the prior art, the magnesium-based composite refractory material and the preparation method and application thereof have the beneficial effects that:
1. the main component of the designed refractory material is modified light burned magnesia, wherein the modified light burned magnesia is light burned magnesia with zirconia powder and manganese oxide powder embedded in the surface defects of magnesite grains through asphalt bonding; in the modified light burned magnesia, magnesite sand particles are zirconia powder, manganese oxide powder, asphalt=100 (1.5-4), 1.5-4 and 0.1-0.3. By adopting the modified light burned magnesia, the zirconia powder and the manganese oxide powder can be combined with magnesia particles, the combination of materials is more uniform, and the phenomena of uneven particles, agglomeration and the like caused by simple mixing are avoided. The zirconia is used as an inert filler, has good heat insulation property, reduces the heat conduction coefficient and has strong corrosion resistance; and manganese oxide has the property of improving the erosion resistance and the thermal shock stability of magnesium. Zirconium oxide and manganese oxide are embedded in the surface defects of magnesite sand particles, so that the performance of each particle can be uniformly improved.
2. The invention designs and adds the titanium dioxide fiber and the modified zirconia fiber, wherein the titanium dioxide fiber can greatly improve the fracture toughness and the thermal shock resistance at 1200-1600 ℃. The modified zirconia fiber is zirconia fiber coated with alumina on the surface, and can improve fracture toughness and thermal shock resistance at the temperature of more than 1600 ℃.
3. According to the method, firstly, coal-based spinning asphalt is added into titanium dioxide fibers and modified zirconia fibers, so that the asphalt is coated on the surfaces of the fibers, then, the asphalt is added into modified light-burned magnesia for ball milling and mixing, the shape of the fibers is changed by ball milling and mixing, the particle combination property of the fibers and the modified light-burned magnesia is improved, and then, the fibers are heated and modified, so that the fibers are bonded on the modified light-burned magnesia particles, the uniformity of the material is better, and the phenomenon of uneven fiber mixing does not occur; when the brick body is repeatedly pressed in the follow-up process, layering caused by vibration and uneven quality can not occur. In addition, the ball milling and mixing change the shape of the fiber, so that the linear fiber is changed into a bent fiber with different degrees, and the bent fiber is attached to the surface of the particle, and the fracture toughness and thermal shock resistance of the fiber in the material can be further improved.
4. According to the method, coal-series spinning asphalt powder is added for secondary coating modification, so that the firmness of the modified light burned magnesia defect embedded micro powder can be further improved on one hand; on the other hand, the spinning asphalt membrane can reduce the damage of magnesia particles caused by internal and external pressure during the subsequent use of mixing or pressing or high-temperature use, and has stronger deformation resistance to high temperature and high pressure; on the other hand, the fusion property of the magnesia particles can be improved, the surface defects can be effectively made up, the generation of air holes or material gaps can be reduced during subsequent processing and use, the bonding density and hardness are higher, and the magnesia composite material is wear-resistant and scouring-resistant.
5. The method is designed to add the dust removal ash for ball pressing, and calcine at 1200-1400 ℃, so that the dust removal ash has better ball pressing effect on the titanium dioxide fibers and the modified zirconia fibers, better fixity and capability of further preventing uneven distribution and uneven quality caused by falling of fiber materials after ball pressing; in addition, the addition of the dust can reduce the cohesiveness of the surface of the asphalt modified coating layer, the dispersibility among particles is better, and the mixing uniformity is higher when the ramming mass is prepared or other auxiliary agents are added in the follow-up process; the calcined material has more excellent erosion resistance, thermal shock stability, high-temperature creep resistance and the like.
6. The materials in the method of the invention are in bonding relation, so that the phenomenon of uneven mixing is avoided, layering can not occur due to different densities or different particle sizes and masses, the phenomenon of uneven upper and lower masses or densities can not occur during brick pressing, the furnace penetrating phenomenon is avoided, and the use safety is higher.
7. The refractory material of the invention can achieve more excellent index performance by adding a small amount of fiber, and the consumption is saved. After the refractory bricks are pressed, the normal-temperature compressive strength is more than 120MPa, the creep rate (1400 ℃ multiplied by 60 h) is less than 0.25%, and the high-temperature flexural strength (1400 ℃ for 0.5 h) is more than 60 MPa; the performance of the refractory brick is far superior to that of similar refractory brick products.
Detailed Description
The invention will be further illustrated with reference to specific examples, but the invention is not limited to these examples.
Example 1
The magnesium-based composite refractory material comprises the following raw materials in parts by mass: 100 parts of modified light burned magnesia, 10 parts of dust, 3 parts of titanium dioxide fiber, 3 parts of modified zirconia fiber and 2 parts of coal-based spinning pitch.
Wherein the modified light burned magnesia is light burned magnesia with zirconia powder and manganese oxide powder embedded in the surface defects of magnesite grains through asphalt bonding. In the modified light burned magnesia, magnesite sand particles are zirconia powder, manganese oxide powder, asphalt=100 (1.5-4), 1.5-4 and 0.1-0.3. The preparation method of the modified light burned magnesia sand comprises the following steps: mixing zirconia micropowder and manganese oxide micropowder, adding asphalt micropowder, uniformly mixing, adding into magnesite sand with surface defects, and calcining to obtain modified light-burned magnesite sand.
The dust is generated when producing large crystal magnesite. The median particle size of the coal-based spinning pitch was 2um. The modified zirconia fiber is zirconia fiber with the surface coated with alumina, and the preparation method is the prior art; the diameter of the modified zirconia fiber was 0.08mm and the length was 1mm. The diameter of the titanium dioxide fiber is 0.12mm and the length is 1.2mm.
The preparation method of the magnesium-based composite refractory material comprises the following steps:
s1: 3 parts of titanium dioxide fibers and 3 parts of modified zirconia fibers are mixed, and then 2 parts of coal-based spinning asphalt is added for uniform mixing to prepare a composite auxiliary material;
s2: adding composite auxiliary materials into 100 parts of modified light burned magnesia for ball milling and mixing for 35min, and then carrying out heating and modification treatment, wherein the stirring speed of the heating and modification treatment is 80r/min, the heating temperature is 360 ℃, and the modification time is 2.5h, so as to obtain modified materials;
s3: adding 10 parts of dust to the modified material for uniform mixing, then pressing the mixture into balls, drying, and calcining in a furnace at 1200 ℃ for 3 hours to obtain the magnesium-based composite refractory material.
Compared with the refractory material prepared by a simple mixing process, the refractory material has better high-temperature creep resistance, erosion resistance and thermal shock stability, better quality, better mixing quality and collapse resistance, does not cause furnace penetration phenomenon, is particularly suitable for kiln treatment environments with high curvature of high-low temperature change, frequent temperature fluctuation caused by flue gas and air alternation and high aggressiveness, and can be calculated according to early trial performance change, and the service life can be longer than 10 years; the specific process parameters and performance data of the refractory bricks are shown in the attached table 1.
Example 2
The magnesium-based composite refractory material comprises the following raw materials in parts by mass: 100 parts of modified light burned magnesia, 12 parts of fly ash, 3 parts of titanium dioxide fiber, 4 parts of modified zirconia fiber and 3 parts of coal-based spinning pitch.
Wherein the modified light burned magnesia is light burned magnesia with zirconia powder and manganese oxide powder embedded in the surface defects of magnesite grains through asphalt bonding. In the modified light burned magnesia, magnesite sand particles are zirconia powder, manganese oxide powder, asphalt=100 (1.5-4), 1.5-4 and 0.1-0.3. The preparation method of the modified light burned magnesia sand comprises the following steps: mixing zirconia micropowder and manganese oxide micropowder, adding asphalt micropowder, uniformly mixing, adding into magnesite sand with surface defects, and calcining to obtain modified light-burned magnesite sand.
The dust is generated when producing large crystal magnesite. The median particle size of the coal-based spinning pitch was 3um. The modified zirconia fiber is zirconia fiber with the surface coated with alumina, and the preparation method is the prior art; the diameter of the modified zirconia fiber was 0.1mm and the length was 0.5mm. The diameter of the titanium dioxide fiber is 1.3mm, and the length is 1mm.
The preparation method of the magnesium-based composite refractory material comprises the following steps:
s1: 3 parts of titanium dioxide fibers and 4 parts of modified zirconia fibers are mixed, and then 3 parts of coal-based spinning asphalt is added for uniform mixing to prepare a composite auxiliary material;
s2: adding composite auxiliary materials into 100 parts of modified light burned magnesia, performing ball milling and mixing for 30min, and then performing heating and modification treatment, wherein the stirring speed of the heating and modification treatment is 100r/min, the heating temperature is 370 ℃, and the modification time is 2h, so as to obtain modified materials;
s3: adding 12 parts of dust to the modified material for uniform mixing, then pressing the mixture into balls, drying, and then calcining in a furnace at 1250 ℃ for 3 hours to obtain the magnesium-based composite refractory material.
Compared with the refractory material prepared by a simple mixing process, the refractory material has better high-temperature creep resistance, erosion resistance and thermal shock stability, better quality, better mixing quality and collapse resistance, does not cause furnace penetration phenomenon, is particularly suitable for kiln treatment environments with high curvature of high-low temperature change, frequent temperature fluctuation caused by flue gas and air alternation and high aggressiveness, and can be calculated according to early trial performance change, and the service life can be longer than 10 years; the specific process parameters and performance data of the refractory bricks are shown in the attached table 1.
Example 3
The magnesium-based composite refractory material comprises the following raw materials in parts by mass: 100 parts of modified light burned magnesia, 15 parts of dust, 2 parts of titanium dioxide fiber, 3 parts of modified zirconia fiber and 1 part of coal-based spinning pitch.
Wherein the modified light burned magnesia is light burned magnesia with zirconia powder and manganese oxide powder embedded in the surface defects of magnesite grains through asphalt bonding. In the modified light burned magnesia, magnesite sand particles are zirconia powder, manganese oxide powder, asphalt=100 (1.5-4), 1.5-4 and 0.1-0.3. The preparation method of the modified light burned magnesia sand comprises the following steps: mixing zirconia micropowder and manganese oxide micropowder, adding asphalt micropowder, uniformly mixing, adding into magnesite sand with surface defects, and calcining to obtain modified light-burned magnesite sand.
The dust is generated when producing large crystal magnesite. The median particle size of the coal-based spinning pitch was 5um. The modified zirconia fiber is zirconia fiber with the surface coated with alumina, and the preparation method is the prior art; the diameter of the modified zirconia fiber was 0.15mm and the length was 0.6mm. The diameter of the titanium dioxide fiber is 0.08mm and the length is 0.5mm.
The preparation method of the magnesium-based composite refractory material comprises the following steps:
s1: mixing 2 parts of titanium dioxide fibers and 3 parts of modified zirconia fibers, and then adding 1 part of coal-based spinning asphalt for uniform mixing to prepare a composite auxiliary material;
s2: adding composite auxiliary materials into 100 parts of modified light burned magnesia for ball milling and mixing, wherein the ball milling and mixing time is 40min, then carrying out heating and modifying treatment, the stirring speed of the heating and modifying treatment is 80r/min, the heating temperature is 365 ℃, and the modifying time is 2.2h, so as to obtain modified materials;
s3: adding 15 parts of dust to the modified material for uniform mixing, then pressing the mixture into balls, drying, and calcining in a furnace at 1300 ℃ for 4 hours to obtain the magnesium-based composite refractory material.
Compared with the refractory material prepared by a simple mixing process, the refractory material has better high-temperature creep resistance, erosion resistance and thermal shock stability, better quality, better mixing quality and collapse resistance, does not cause furnace penetration phenomenon, is particularly suitable for kiln treatment environments with high curvature of high-low temperature change, frequent temperature fluctuation caused by flue gas and air alternation and high aggressiveness, and can be calculated according to early trial performance change, and the service life can be longer than 10 years; the specific process parameters and performance data of the refractory bricks are shown in the attached table 1.
Example 4
The magnesium-based composite refractory material comprises the following raw materials in parts by mass: 100 parts of modified light burned magnesia, 8 parts of fly ash, 4 parts of titanium dioxide fiber, 2 parts of modified zirconia fiber and 2.5 parts of coal-based spinning pitch.
Wherein the modified light burned magnesia is light burned magnesia with zirconia powder and manganese oxide powder embedded in the surface defects of magnesite grains through asphalt bonding. In the modified light burned magnesia, magnesite sand particles are zirconia powder, manganese oxide powder, asphalt=100 (1.5-4), 1.5-4 and 0.1-0.3. The preparation method of the modified light burned magnesia sand comprises the following steps: mixing zirconia micropowder and manganese oxide micropowder, adding asphalt micropowder, uniformly mixing, adding into magnesite sand with surface defects, and calcining to obtain modified light-burned magnesite sand.
The dust is generated when producing large crystal magnesite. The median particle size of the coal-based spinning pitch was 4um. The modified zirconia fiber is zirconia fiber with the surface coated with alumina, and the preparation method is the prior art; the diameter of the modified zirconia fiber was 0.12mm and the length was 0.8mm. The diameter of the titanium dioxide fiber is 0.05mm and the length is 1.5mm.
The preparation method of the magnesium-based composite refractory material comprises the following steps:
s1: mixing 4 parts of titanium dioxide fibers and 2 parts of modified zirconia fibers, and then adding 2.5 parts of coal-based spinning asphalt for uniform mixing to prepare a composite auxiliary material;
s2: adding composite auxiliary materials into 100 parts of modified light burned magnesia for ball milling and mixing, wherein the ball milling and mixing time is 30min, then heating and modifying, the stirring speed of the heating and modifying is 60r/min, the heating temperature is 380 ℃, and the modifying time is 2.5h, so as to obtain modified materials;
s3: adding 8 parts of dust to the modified material for uniform mixing, then pressing the mixture into balls, drying, and calcining in a furnace at 1400 ℃ for 3.5 hours to obtain the magnesium-based composite refractory material.
Compared with the refractory material prepared by a simple mixing process, the refractory material has better high-temperature creep resistance, erosion resistance and thermal shock stability, better quality, better mixing quality and collapse resistance, does not cause furnace penetration phenomenon, is particularly suitable for kiln treatment environments with high curvature of high-low temperature change, frequent temperature fluctuation caused by flue gas and air alternation and high aggressiveness, and can be calculated according to early trial performance change, and the service life can be longer than 10 years; the specific process parameters and performance data of the refractory bricks are shown in the attached table 1.
Example 5
The magnesium-based composite refractory material comprises the following raw materials in parts by mass: 100 parts of modified light burned magnesia, 5 parts of dust, 4 parts of titanium dioxide fiber, 4 parts of modified zirconia fiber and 3 parts of coal-based spinning pitch.
Wherein the modified light burned magnesia is light burned magnesia with zirconia powder and manganese oxide powder embedded in the surface defects of magnesite grains through asphalt bonding. In the modified light burned magnesia, magnesite sand particles are zirconia powder, manganese oxide powder, asphalt=100 (1.5-4), 1.5-4 and 0.1-0.3. The preparation method of the modified light burned magnesia sand comprises the following steps: mixing zirconia micropowder and manganese oxide micropowder, adding asphalt micropowder, uniformly mixing, adding into magnesite sand with surface defects, and calcining to obtain modified light-burned magnesite sand.
The dust is generated when producing large crystal magnesite. The median particle size of the coal-based spinning pitch was 6um. The modified zirconia fiber is zirconia fiber with the surface coated with alumina, and the preparation method is the prior art; the diameter of the modified zirconia fiber was 0.1mm and the length was 1.2mm. The diameter of the titanium dioxide fiber is 0.06mm, and the length is 0.6mm.
The preparation method of the magnesium-based composite refractory material comprises the following steps:
s1: mixing 4 parts of titanium dioxide fibers and 4 parts of modified zirconia fibers, and then adding 3 parts of coal-based spinning asphalt for uniform mixing to prepare a composite auxiliary material;
s2: adding composite auxiliary materials into 100 parts of modified light burned magnesia, performing ball milling and mixing for 35min, and then performing heating and modification treatment, wherein the stirring speed of the heating and modification treatment is 60r/min, the heating temperature is 360 ℃, and the modification time is 2h, so as to obtain modified materials;
s3: adding 5 parts of dust to the modified material for uniform mixing, then pressing the mixture into balls, drying, and calcining in a furnace at 1350 ℃ for 3 hours to obtain the magnesium-based composite refractory material.
Compared with the refractory material prepared by a simple mixing process, the refractory material has better high-temperature creep resistance, erosion resistance and thermal shock stability, better quality, better mixing quality and collapse resistance, does not cause furnace penetration phenomenon, is particularly suitable for kiln treatment environments with high curvature of high-low temperature change, frequent temperature fluctuation caused by flue gas and air alternation and high aggressiveness, and can be calculated according to early trial performance change, and the service life can be longer than 10 years; the specific process parameters and performance data of the refractory bricks are shown in the attached table 1.
Example 6
The magnesium-based composite refractory material comprises the following raw materials in parts by mass: 100 parts of modified light burned magnesia, 14 parts of fly ash, 2.5 parts of titanium dioxide fiber, 3.5 parts of modified zirconia fiber and 2.5 parts of coal-based spinning asphalt.
Wherein the modified light burned magnesia is light burned magnesia with zirconia powder and manganese oxide powder embedded in the surface defects of magnesite grains through asphalt bonding. In the modified light burned magnesia, magnesite sand particles are zirconia powder, manganese oxide powder, asphalt=100 (1.5-4), 1.5-4 and 0.1-0.3. The preparation method of the modified light burned magnesia sand comprises the following steps: mixing zirconia micropowder and manganese oxide micropowder, adding asphalt micropowder, uniformly mixing, adding into magnesite sand with surface defects, and calcining to obtain modified light-burned magnesite sand.
The dust is generated when producing large crystal magnesite. The median particle size of the coal-based spinning pitch was 3.5um. The modified zirconia fiber is zirconia fiber with the surface coated with alumina, and the preparation method is the prior art; the diameter of the modified zirconia fiber was 0.05mm and the length was 1.5mm. The diameter of the titanium dioxide fiber is 0.1mm, and the length is 0.8mm.
The preparation method of the magnesium-based composite refractory material comprises the following steps:
s1: mixing 2.5 parts of titanium dioxide fibers and 3.5 parts of modified zirconia fibers, and then adding 2.5 parts of coal-based spinning asphalt for uniform mixing to prepare a composite auxiliary material;
s2: adding composite auxiliary materials into 100 parts of modified light burned magnesia, performing ball milling and mixing for 40min, and then performing heating and modification treatment, wherein the stirring speed of the heating and modification treatment is 100r/min, the heating temperature is 375 ℃, and the modification time is 2.5h, so as to obtain a modified material;
s3: adding 14 parts of dust to the modified material for uniform mixing, then pressing the mixture into balls, drying, and calcining in a furnace at 1220 ℃ for 4 hours to obtain the magnesium-based composite refractory material.
Compared with the refractory material prepared by a simple mixing process, the refractory material has better high-temperature creep resistance, erosion resistance and thermal shock stability, better quality, better mixing quality and collapse resistance, does not cause furnace penetration phenomenon, is particularly suitable for kiln treatment environments with high curvature of high-low temperature change, frequent temperature fluctuation caused by flue gas and air alternation and high aggressiveness, and can be calculated according to early trial performance change, and the service life can be longer than 10 years; the specific process parameters and performance data of the refractory bricks are shown in the attached table 1.
Example 7
The magnesium-based composite refractory material comprises the following raw materials in parts by mass: 100 parts of modified light burned magnesia, 13 parts of dust, 2 parts of titanium dioxide fiber, 4 parts of modified zirconia fiber and 3 parts of coal-based spinning pitch.
Wherein the modified light burned magnesia is light burned magnesia with zirconia powder and manganese oxide powder embedded in the surface defects of magnesite grains through asphalt bonding. In the modified light burned magnesia, magnesite sand particles are zirconia powder, manganese oxide powder, asphalt=100 (1.5-4), 1.5-4 and 0.1-0.3. The preparation method of the modified light burned magnesia sand comprises the following steps: mixing zirconia micropowder and manganese oxide micropowder, adding asphalt micropowder, uniformly mixing, adding into magnesite sand with surface defects, and calcining to obtain modified light-burned magnesite sand.
The dust is generated when producing large crystal magnesite. The median particle size of the coal-based spinning pitch was 2.5um. The modified zirconia fiber is zirconia fiber with the surface coated with alumina, and the preparation method is the prior art; the diameter of the modified zirconia fiber was 0.07mm and the length was 1.4mm. The diameter of the titanium dioxide fiber is 0.11mm and the length is 1.2mm.
The preparation method of the magnesium-based composite refractory material comprises the following steps:
s1: mixing 2 parts of titanium dioxide fibers and 4 parts of modified zirconia fibers, and then adding 3 parts of coal-based spinning asphalt for uniform mixing to prepare a composite auxiliary material;
s2: adding composite auxiliary materials into 100 parts of modified light burned magnesia, performing ball milling and mixing for 35min, and then performing heating and modification treatment, wherein the stirring speed of the heating and modification treatment is 70r/min, the heating temperature is 372 ℃, and the modification time is 2h, so as to obtain a modified material;
s3: 13 parts of dust is added into the modified material for uniform mixing, then the mixture is pressed into balls, and the balls are dried and then are put into a furnace for calcination, wherein the calcination temperature is 1280 ℃ and the calcination time is 3.5h, thus obtaining the magnesium-based composite refractory material.
Compared with the refractory material prepared by a simple mixing process, the refractory material has better high-temperature creep resistance, erosion resistance and thermal shock stability, better quality, better mixing quality and collapse resistance, does not cause furnace penetration phenomenon, is particularly suitable for kiln treatment environments with high curvature of high-low temperature change, frequent temperature fluctuation caused by flue gas and air alternation and high aggressiveness, and can be calculated according to early trial performance change, and the service life can be longer than 10 years; the specific process parameters and performance data of the refractory bricks are shown in the attached table 1.
Example 8
The magnesium-based composite refractory material comprises the following raw materials in parts by mass: 100 parts of modified light burned magnesia, 10 parts of dust, 2 parts of titanium dioxide fiber, 2 parts of modified zirconia fiber and 1 part of coal-based spinning pitch.
Wherein the modified light burned magnesia is light burned magnesia with zirconia powder and manganese oxide powder embedded in the surface defects of magnesite grains through asphalt bonding. In the modified light burned magnesia, magnesite sand particles are zirconia powder, manganese oxide powder, asphalt=100 (1.5-4), 1.5-4 and 0.1-0.3. The preparation method of the modified light burned magnesia sand comprises the following steps: mixing zirconia micropowder and manganese oxide micropowder, adding asphalt micropowder, uniformly mixing, adding into magnesite sand with surface defects, and calcining to obtain modified light-burned magnesite sand.
The dust is generated when producing large crystal magnesite. The median particle size of the coal-based spinning pitch was 4.5um. The modified zirconia fiber is zirconia fiber with the surface coated with alumina, and the preparation method is the prior art; the diameter of the modified zirconia fiber was 0.06mm and the length was 1.1mm. The diameter of the titanium dioxide fiber is 0.15mm and the length is 1.4mm.
The preparation method of the magnesium-based composite refractory material comprises the following steps:
s1: mixing 2 parts of titanium dioxide fibers and 2 parts of modified zirconia fibers, and then adding 1 part of coal-based spinning asphalt for uniform mixing to prepare a composite auxiliary material;
s2: adding composite auxiliary materials into 100 parts of modified light burned magnesia for ball milling and mixing, wherein the ball milling and mixing time is 40min, then carrying out heating and modifying treatment, the stirring speed of the heating and modifying treatment is 90r/min, the heating temperature is 368 ℃, and the modifying time is 2.5h, so as to obtain modified materials;
s3: adding 10 parts of dust to the modified material for uniform mixing, then pressing the mixture into balls, drying, and calcining in a furnace at 1320 ℃ for 3 hours to obtain the magnesium-based composite refractory material.
Compared with the refractory material prepared by a simple mixing process, the refractory material has better high-temperature creep resistance, erosion resistance and thermal shock stability, better quality, better mixing quality and collapse resistance, does not cause furnace penetration phenomenon, is particularly suitable for kiln treatment environments with high curvature of high-low temperature change, frequent temperature fluctuation caused by flue gas and air alternation and high aggressiveness, and can be calculated according to early trial performance change, and the service life can be longer than 10 years; the specific process parameters and performance data of the refractory bricks are shown in the attached table 1.
Example 9
The magnesium-based composite refractory material comprises the following raw materials in parts by mass: 100 parts of modified light burned magnesia, 12 parts of dust, 2.5 parts of titanium dioxide fiber, 2.5 parts of modified zirconia fiber and 2 parts of coal-based spinning pitch.
Wherein the modified light burned magnesia is light burned magnesia with zirconia powder and manganese oxide powder embedded in the surface defects of magnesite grains through asphalt bonding. In the modified light burned magnesia, magnesite sand particles are zirconia powder, manganese oxide powder, asphalt=100 (1.5-4), 1.5-4 and 0.1-0.3. The preparation method of the modified light burned magnesia sand comprises the following steps: mixing zirconia micropowder and manganese oxide micropowder, adding asphalt micropowder, uniformly mixing, adding into magnesite sand with surface defects, and calcining to obtain modified light-burned magnesite sand.
The dust is generated when producing large crystal magnesite. The median particle size of the coal-based spinning pitch was 3um. The modified zirconia fiber is zirconia fiber with the surface coated with alumina, and the preparation method is the prior art; the diameter of the modified zirconia fiber was 0.14mm and the length was 1.3mm. The diameter of the titanium dioxide fiber is 0.1mm, and the length is 0.9mm.
The preparation method of the magnesium-based composite refractory material comprises the following steps:
s1: mixing 2.5 parts of titanium dioxide fibers and 2.5 parts of modified zirconia fibers, and then adding 2 parts of coal-based spinning asphalt for uniform mixing to prepare a composite auxiliary material;
s2: adding composite auxiliary materials into 100 parts of modified light burned magnesia, performing ball milling and mixing for 35min, and then performing heating and modification treatment, wherein the stirring speed of the heating and modification treatment is 60r/min, the heating temperature is 360 ℃, and the modification time is 2h, so as to obtain modified materials;
s3: adding 12 parts of dust to the modified material for uniform mixing, then pressing the mixture into balls, drying, and calcining in a furnace at 1380 ℃ for 4 hours to obtain the magnesium-based composite refractory material.
Compared with the refractory material prepared by a simple mixing process, the refractory material has better high-temperature creep resistance, erosion resistance and thermal shock stability, better quality, better mixing quality and collapse resistance, does not cause furnace penetration phenomenon, is particularly suitable for kiln treatment environments with high curvature of high-low temperature change, frequent temperature fluctuation caused by flue gas and air alternation and high aggressiveness, and can be calculated according to early trial performance change, and the service life can be longer than 10 years; the specific process parameters and performance data of the refractory bricks are shown in the attached table 1.
Example 10
The magnesium-based composite refractory material comprises the following raw materials in parts by mass: 100 parts of modified light burned magnesia, 8 parts of dust, 3.5 parts of titanium dioxide fiber, 3.5 parts of modified zirconia fiber and 3 parts of coal-based spinning pitch.
Wherein the modified light burned magnesia is light burned magnesia with zirconia powder and manganese oxide powder embedded in the surface defects of magnesite grains through asphalt bonding. In the modified light burned magnesia, magnesite sand particles are zirconia powder, manganese oxide powder, asphalt=100 (1.5-4), 1.5-4 and 0.1-0.3. The preparation method of the modified light burned magnesia sand comprises the following steps: mixing zirconia micropowder and manganese oxide micropowder, adding asphalt micropowder, uniformly mixing, adding into magnesite sand with surface defects, and calcining to obtain modified light-burned magnesite sand.
The dust is generated when producing large crystal magnesite. The median particle size of the coal-based spinning pitch was 3um. The modified zirconia fiber is zirconia fiber with the surface coated with alumina, and the preparation method is the prior art; the diameter of the modified zirconia fiber was 0.14mm and the length was 1.3mm. The diameter of the titanium dioxide fiber is 0.1mm, and the length is 0.9mm.
The preparation method of the magnesium-based composite refractory material comprises the following steps:
s1: 3.5 parts of titanium dioxide fiber and 3.5 parts of modified zirconia fiber are mixed, and then 3 parts of coal-based spinning asphalt is added for uniform mixing to prepare a composite auxiliary material;
s2: adding composite auxiliary materials into 100 parts of modified light burned magnesia for ball milling and mixing for 35min, and then carrying out heating and modification treatment, wherein the stirring speed of the heating and modification treatment is 90r/min, the heating temperature is 360 ℃, and the modification time is 2.5h, so as to obtain modified materials;
s3: adding 8 parts of dust to the modified material for uniform mixing, then pressing the mixture into balls, drying, and calcining in a furnace at 1260 ℃ for 3.5 hours to obtain the magnesium-based composite refractory material.
Compared with the refractory material prepared by a simple mixing process, the refractory material has better high-temperature creep resistance, erosion resistance and thermal shock stability, better quality, better mixing quality and collapse resistance, does not cause furnace penetration phenomenon, is particularly suitable for kiln treatment environments with high curvature of high-low temperature change, frequent temperature fluctuation caused by flue gas and air alternation and high aggressiveness, and can be calculated according to early trial performance change, and the service life can be longer than 10 years; the specific process parameters and performance data of the refractory bricks are shown in the attached table 1.
Table 1 example process parameters and performance data
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Claims (7)
1. The magnesium-based composite refractory material is characterized by comprising the following raw materials in parts by weight: 100 parts of modified light burned magnesia, 5-15 parts of dust, 2-4 parts of titanium dioxide fiber, 2-4 parts of modified zirconia fiber and 1-3 parts of coal-based spinning pitch;
the modified light burned magnesia is light burned magnesia with zirconia powder and manganese oxide powder embedded in the surface defects of magnesite grains through asphalt bonding; in the modified light burned magnesia, the magnesite sand particles are zirconia powder and manganese oxide powder, wherein asphalt=100 (1.5-4) (0.1-0.3);
a preparation method of a magnesium-based composite refractory material comprises the following steps:
s1: mixing 2-4 parts of titanium dioxide fibers and 2-4 parts of modified zirconia fibers, and then adding 1-3 parts of coal-based spinning asphalt for uniform mixing to prepare composite auxiliary materials;
s2: adding composite auxiliary materials into 100 parts of modified light burned magnesia for ball milling and mixing, and then carrying out heating modification treatment, wherein the stirring speed of the heating modification treatment is 60-100 r/min, the heating temperature is 360-380 ℃, and the modification time is 2-2.5 h, so as to obtain modified materials;
s3: adding 5-15 parts of dust into the modified material for uniform mixing, then pressing the mixture into balls, drying, and then calcining in a furnace at 1200-1400 ℃ for 3-4 hours to obtain the magnesium-based composite refractory material.
2. A magnesium based composite refractory according to claim 1, wherein said fly ash is fly ash produced in the production of large crystal magnesite.
3. The magnesium-based composite refractory material according to claim 1, wherein the coal-based spun pitch has a median particle size of 2 to 6 μm.
4. A magnesium-based composite refractory material according to claim 1, wherein the modified zirconia fiber is a zirconia fiber surface-coated with alumina; the diameter of the modified zirconia fiber is 0.05-0.15 mm, and the length is 0.5-1.5 mm.
5. A magnesium based composite refractory according to claim 1, wherein the titania fibers have a diameter of 0.05 to 0.15mm and a length of 0.5 to 1.5mm.
6. The magnesium-based composite refractory according to claim 1, wherein the ball milling mixing time is 30 to 40 minutes.
7. The application of the magnesium-based composite refractory material as claimed in claim 1, wherein the magnesium-based composite refractory material is applied to the preparation of refractory bricks or ramming material lining materials, and is suitable for kiln treatment environments with high curvature of high and low temperature change, frequent temperature fluctuation caused by flue gas and air alternation and high aggressiveness.
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| CN102584293A (en) * | 2012-02-24 | 2012-07-18 | 辽宁科技大学 | Method for preparing magnesium-zirconium-carbon slide gate nozzle |
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| US6313056B1 (en) * | 1998-08-20 | 2001-11-06 | Harbison-Walker Refractories Company | Non-slumping sprayable refractory castables containing thermal black |
| CN102584293A (en) * | 2012-02-24 | 2012-07-18 | 辽宁科技大学 | Method for preparing magnesium-zirconium-carbon slide gate nozzle |
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