CN113636831B - Quick-drying hollow sphere heat-insulation refractory castable - Google Patents

Quick-drying hollow sphere heat-insulation refractory castable Download PDF

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CN113636831B
CN113636831B CN202111080521.9A CN202111080521A CN113636831B CN 113636831 B CN113636831 B CN 113636831B CN 202111080521 A CN202111080521 A CN 202111080521A CN 113636831 B CN113636831 B CN 113636831B
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powder
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hollow sphere
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罗巍
刘义滔
欧阳德刚
何金平
朱善合
丁翠娇
汪峰
刘刚峰
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Wuhan Iron and Steel Co Ltd
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Abstract

The invention discloses a quick-drying hollow sphere heat insulation materialThe fire castable comprises the following raw materials in percentage by weight: 35-45% of alumina hollow sphere, 5-8% of microporous calcium hexaluminate lightweight aggregate, 3-5% of floating bead, 3-5% of nano silica aerogel powder, 5-8% of kyanite powder, 5-8% of first-grade high alumina clinker powder, 10-15% of refractory fiber, 2-3% of potassium hexatitanate whisker, 2-4% of silicon micropowder, alpha-Al 2 O 3 10 to 15 percent of micro powder, 0.1 to 0.3 percent of composite water reducing agent, 0.02 to 0.05 percent of water-based silicon polyether defoaming agent, 0.1 to 0.3 percent of coagulant and 0.05 to 0.15 percent of retarder; in addition, the additive also comprises silica sol which is added in an additional form, and the adding amount accounts for 20-30% of the total mass of other raw materials. The refractory castable has the advantages of short maintenance and drying time, excellent heat insulation performance and thermal shock resistance stability, good mechanical property and the like, can effectively reduce the water-cooling heat loss of the high-temperature water-cooling furnace roller of the sheet billet continuous casting and rolling tunnel type heating furnace, improve the heat efficiency of the heating furnace, prolong the service life of a furnace roller heat insulation layer, reduce the drying time of the furnace roller and shorten the manufacturing period.

Description

Quick-drying hollow sphere heat-insulation refractory castable
Technical Field
The invention relates to the technical field of refractory materials, in particular to a quick-drying hollow sphere heat-insulating refractory castable for a high-temperature water-cooling furnace roller of a tunnel heating furnace.
Background
The tunnel type heating furnace for continuous casting and rolling of thin slabs has the characteristics of long furnace body and large number of furnace rollers, the high-temperature water-cooled furnace rollers are used for supporting and driving the slabs in the furnace, the temperature in the furnace is generally as high as 1100-1300 ℃, in order to improve the strength and rigidity of the furnace rollers, a fireproof heat-insulation protective layer is usually adopted between metal roller rings, water is introduced into the furnace rollers for cooling, and the functions of protecting the furnace rollers, reducing the heat loss of water cooling and prolonging the service life are achieved.
The furnace roller fire-resistant heat-insulating protective layer mainly comprises a fire-resistant castable and a fire-resistant fiber material, wherein a single fire-resistant fiber material is relatively rare in practical application due to the deterioration of high-temperature performance and short service life, and the most applied fire-resistant castable heat-insulating protective layer is currently used. For example, chinese patent No. CN100408515C discloses a refractory castable for a roller hearth furnace roller, which is prepared from the following components in parts by weight: fused mullite (granularity is less than or equal to 3 mm): 20-45%, flint clay (granularity l-5 mm): 0 to 30%, mullite (particle size 200 mesh): 10-20%, cordierite (particle size less than or equal to 5 mm): 10 to 25%, kyanite (particle size 180 mesh): 5-10%, silicon oxide micro powder (the granularity is less than or equal to 5 mu m): 2-3%, alumina micropowder (granularity is less than or equal to 5 mu m): 5-8%, high alumina cement: 4-5%, stainless steel fiber: 2-4%, explosion-proof fiber: 0.1-0.15%, sodium tripolyphosphate: 0.15 to 0.3%, water: 7.5 to 10 percent. The patent improves the cracking and falling effects of the casting material layer to a certain extent, prolongs the service life of the furnace roller, and still has the defects of higher heat conductivity coefficient and poor heat insulation performance.
The Chinese patent application with publication number CN101792294A discloses a light heat-insulating refractory castable, which comprises the following components in percentage by weight: chemically modified lightweight aggregate: 40 to 60 percent; electrofused mullite (0-1 mm): 10 to 20 percent; cyanite powder (particle size 180 mesh): 5 to 10 percent; first-grade high-alumina bauxite clinker powder (180-mesh particle size): 5 to 10 percent; silicon dioxide micropowder (granularity is less than or equal to 5 mu m): 3 to 8 percent; alpha-Al 2 O 3 Micro powder (granularity is less than or equal to 5 mu m): 3 to 8 percent; high-alumina cement: 5 to 10 percent; zirconium-containing high-alumina refractory fiber: 0.5 to 10 percent; heat-resistant steel fiber: 1.5 to 4 percent; melamine: 0.1 to 1 percent; organic explosion-proof fiber: 0.05 to 0.10 percent. The application of the patent reduces the heat conductivity coefficient of the castable by adopting the lightweight aggregate, and obviously improves the mechanical property and the service life of the lightweight castable by chemically improving the lightweight aggregate, but similar to the previous patent, because the steel fiber is adopted as a reinforcing and toughening mode, the steel fiber is easy to generate high-temperature oxidation expansion and embrittlement failure in the high-temperature use process, and the castable is degraded and poured by the high-temperature reaction of an oxidation product and the refractory castableHigh-temperature service performance of the material.
In order to overcome the defects, a Chinese patent with an authorization publication number CN102161593B discloses a lightweight refractory castable for a CSP furnace roller heat insulation lining, refractory fibers are adopted to replace steel fibers to play a role in strengthening and toughening, and the lightweight refractory castable comprises the following components in percentage by weight: lightweight mullite aggregate: 40 to 50 percent; flint clay (granularity 0.1-1 mm): 5 to 8 percent; lanlite powder (particle size 60-120 mesh): 5 to 7 percent; first-grade high-alumina bauxite clinker powder (the granularity is less than or equal to 180 meshes): 6 to 9 percent; silicon micropowder: 7 to 9 percent; alpha-Al 2 O 3 Micro-powder: 5 to 8 percent; high-alumina cement: 10 to 18 percent; refractory fiber: 1 to 4 percent; spodumene (particle size 160-200 mesh): 1 to 1.5 percent; sodium hexametaphosphate: 0.05 to 0.154 percent; organic water reducing agent: 0.05-0.15%: 0.04 to 0.07 percent of organosilane coupling agent; defoaming agent: 0.03 to 0.06 percent. Compared with the heavy castable in the Chinese patent with the grant publication number CN100408515C, the castable has the characteristics of light volume weight, good mechanical property and excellent thermal shock stability, but because the light mullite aggregate is easy to break in the processes of transportation and carrying, the deterioration of the aggregate property not only causes the increase of loss amount, but also causes the fluctuation of the mechanical property of the castable, and in addition, the heat-insulating property of the castable is still required to be further improved. In addition, the furnace roller refractory castable needs to be baked for a long time or aired for one month in a normal-temperature environment after being poured, maintained and formed, so that the manufacturing time is long, and the document is perfect; liu Guowei; development and application of baking-free castable in center of thin slab furnace roller [ J]The furnace roller castable reported in Industrial furnace 2006, 28 (2): 42-43, 52 ", although it is used directly in the furnace without baking, since it has a density of 2.3g/cm 3 The mullite heavy castable has poor heat insulation performance, has the problem of cracking and breakage in the use process, and has the service life longer than 10 months.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a quick-drying hollow sphere heat-insulating refractory castable material aiming at the defects in the prior art, which has the advantages of short maintenance and drying time, excellent heat-insulating property and thermal shock resistance, good mechanical property and the like, and not only can effectively reduce the water-cooling heat loss of a high-temperature water-cooling furnace roller of a sheet billet continuous casting and rolling tunnel type heating furnace, improve the heat efficiency of the heating furnace, prolong the service life of a heat-insulating layer of the furnace roller, but also can reduce the drying time of the furnace roller and shorten the manufacturing period.
The technical scheme adopted by the invention for solving the problems is as follows:
a quick-drying hollow sphere heat-insulation refractory castable comprises the following raw materials in percentage by weight: 35-45% of alumina hollow sphere, 5-8% of microporous calcium hexaluminate lightweight aggregate, 3-5% of floating bead, 3-5% of nano silica aerogel powder, 5-8% of kyanite powder, 5-8% of first-grade high alumina clinker powder, 10-15% of refractory fiber, 2-3% of potassium hexatitanate whisker, 2-4% of silicon micropowder, alpha-Al 2 O 3 10 to 15 percent of micro powder, 0.1 to 0.3 percent of composite water reducing agent, 0.02 to 0.05 percent of water-based silicon polyether defoamer, 0.1 to 0.3 percent of coagulant and 0.05 to 0.15 percent of retarder; in addition, the additive also comprises silica sol which is added in an additional form, and the adding amount accounts for 20-30% of the total mass of other raw materials.
As an improvement of the above technical solution, the alumina hollow sphere is particle-graded, specifically comprising: 10-15 wt% of alumina hollow spheres with the particle size of less than or equal to 3mm and less than or equal to 5mm, 10-18 wt% of alumina hollow spheres with the particle size of less than or equal to 1mm and 8-15 wt% of alumina hollow spheres with the particle size of less than or equal to 1mm and less than or equal to 0.2mm, wherein the sum of the weight percentages of the three alumina hollow spheres with particle grading is 35-45%, and the alumina hollow spheres are required in the raw materials.
As an improvement of the technical scheme, the particle size of the microporous calcium hexaluminate lightweight aggregate is 2-3 mm, and the average pore diameter of micropores is less than or equal to 6 mu m.
As an improvement of the technical scheme, the particle size of the floating bead is 80-200 meshes.
As an improvement of the technical scheme, the density of the nano-silica aerogel powder is less than or equal to 0.05g/cm 3 The specific surface area is more than or equal to 600m 2 /g。
As an improvement of the technical scheme, the granularity of the cyanite powder is 80-120 meshes.
As an improvement of the technical scheme, the granularity of the first-grade high-aluminum clinker powder is less than or equal to 200 meshes. The high-alumina clinker powder is classified according to the content of alumina, and the first-grade high-alumina clinker powder is high-alumina clinker powder with the content of alumina being more than 80%.
As an improvement of the technical scheme, the refractory fiber is prepared by using waste refractory fiber after being used by a metallurgical furnace, and specifically, the recovered waste zirconium-containing refractory fiber or aluminum silicate refractory fiber is cut into short fiber with the diameter of 5-10 mm, and the short fiber is sprayed on the surface by using polyethylene glycol aqueous solution with the concentration of 0.7-0.8 g/100mL for modification treatment.
As an improvement of the technical proposal, the potassium hexatitanate whisker has the diameter of 2 to 4 μm and the length-diameter ratio of 10 to 20.
As an improvement of the technical scheme, the silicon micro powder is active silicon micro powder, the granularity is less than or equal to 500 meshes, and the alpha-Al 2 O 3 The granularity of the micro powder is less than or equal to 500 meshes.
As an improvement of the technical scheme, the composite water reducing agent is a mixture of an FS10 high-efficiency water reducing agent and sodium tripolyphosphate, wherein the FS10 high-efficiency water reducing agent accounts for 75-90% of the total mass of the composite water reducing agent, and the sodium tripolyphosphate accounts for 10-25% of the total mass of the composite water reducing agent.
As an improvement of the technical scheme, the water-based silicon polyether defoaming agent is a commercially available RK-720F silicon polyether defoaming agent.
As an improvement of the technical scheme, the coagulant is sintered magnesia powder, the MgO content is more than or equal to 98 percent, and the granularity is less than or equal to 300 meshes.
As an improvement of the technical scheme, the retarder is citric acid.
As an improvement of the technical proposal, siO in the silica sol 2 The content is 30-40%, and the PH value is 9.0-9.5.
Compared with the prior art, the invention has the beneficial effects that:
through the combined use of the alumina hollow spheres and the floating beads with different aggregate grading, the microstructures of hollow spherical closed air holes with different scales existing in the alumina hollow spheres and the floating beads are utilized, the number of millimeter-level and micron-level closed air holes in the castable is increased, the heat insulation performance and the thermal shock resistance of the castable are improved, and the aims of enhancing the heat insulation protection of the furnace roller, reducing the water cooling heat loss, reducing the volume density and reducing the weight of the furnace roller and the consumption of the rotating power are fulfilled.
By using the 2-3 mm microporous calcium hexaluminate lightweight aggregate and utilizing the characteristics of irregular shape and mutually staggered flaky crystal structure of the aggregate, the gap between the hollow sphere aggregates is filled and is inserted between the matrix and the fiber, the mechanical property and the high-temperature volume stability of the castable are improved, and the thermal conductivity coefficient of the castable is further reduced through the microporous structure of the castable.
Through the addition of the floating beads, the heat conductivity coefficient is further reduced, the fluidity of the castable is improved, and meanwhile, when the floating beads are used at high temperature in a tunnel type heating furnace, the floating beads can partially generate liquid phase reaction due to the existence of low-melting-point impurities, so that the sintering promotion effect is achieved, and the high-temperature strength of the castable is improved.
By adding the nano-silica aerogel powder, the heat conductivity coefficient is further reduced and the heat insulation performance of the castable is improved by utilizing the characteristics of nano-scale pore size and ultralow heat conductivity.
By adding the kyanite powder with the grain size of 80-120 meshes and utilizing the characteristic of decomposition and expansion of kyanite at 1100 ℃, the defect of high-temperature sintering shrinkage of the lightweight castable is made up, the high-temperature volume stability of the castable is improved, and cracking and damage caused by high-temperature shrinkage are avoided.
By adding the refractory fiber, the thermal shock stability of the castable is improved, and the heat insulation performance of the castable is improved; particularly, the refractory fiber containing zirconium or the aluminum silicate refractory fiber which is abandoned after being used by a metallurgical furnace is adopted for preparation, so that the cost of the castable is reduced, and the environmental problem caused by the used refractory fiber is solved; the surface of the refractory fiber is modified by adopting the polyethylene glycol aqueous solution with the concentration of 0.7-0.8 g/100mL, so that the interface bonding of the refractory fiber and the dispersion state of the refractory fiber in the casting material are improved, and the reinforcing and toughening effects of the refractory fiber are enhanced.
By adding the potassium hexatitanate whisker, the heat conductivity coefficient of the castable is reduced from three aspects of structural heat insulation, physical heat insulation and infrared reflection by utilizing the characteristics of excellent mechanical property, low heat conductivity, negative temperature coefficient and high infrared reflection, and the reinforcing and toughening effects of the reinforcing fiber are further supplemented.
The silica sol is used as a bonding agent, the curing time of the material meeting construction requirements can be effectively controlled by adjusting the pH value, the aims of shortening the curing time and quickly demolding are achieved, meanwhile, the silica sol is hydrated and gelled in the material, a large number of micropores generated in the molding process can effectively discharge water vapor generated in the material during quick baking, the aims of quick drying and baking are achieved, and the manufacturing period of the furnace roller is greatly shortened; in addition, compared with a cement bonding system, the silica sol bonding castable has good high-temperature strength and thermal shock resistance stability.
By using fine silica powder and alpha-Al 2 O 3 The addition of the micro powder effectively improves the rheological property of the castable, and simultaneously, the silicon dioxide micro powder and the Si-O-Si bond space network structure formed in the silica sol use Al 2 O 3 The microparticles are firmly bonded together and in Al 2 O 3 The surface of the particles forms a nano-coated micro-composite structure, so that the normal temperature strength of the castable is improved, and an acicular mullite crystal is further formed at the temperature of 800-1200 ℃, so that the castable has excellent strength after high-temperature firing.
By adding the sintering magnesia coagulant with the grain diameter less than 300 meshes, the reaction of anions on the surface of the sol can be promoted, the formation and the gelling rate of siloxane groups are accelerated, the normal-temperature strength of the silica sol combined castable is improved, and the demolding and curing time is shortened.
By adding the citric acid retarder, citric acid reacts with MgO particles in the sintered magnesia to generate a magnesium citrate protective layer with low solubility, and the hydration speed of magnesium oxide can be controlled, so that the viscosity of silica sol slurry is reduced, the fluidity of the castable is improved, the coagulation and hardening of a matrix are promoted, and the normal temperature strength of a sample is improved.
Through the optimized combination of the FS10 high-efficiency water reducing agent and the sodium tripolyphosphate, the performance short slab of a single water reducing agent is avoided, the construction fluidity of the casting material is improved, the water adding amount of the casting material is reduced, and the effect of high water reducing rate and no segregation is achieved.
By adding the RK-720F silicon polyether defoaming agent, the formation of bubbles in the colloid material in the process of adding water and stirring the castable is inhibited, the adhesion of refractory powder around the bubbles is avoided, the fluidity of the castable is improved, meanwhile, the formation of bubbles on the surfaces of the colloid material, the alumina hollow spheres and the microporous calcium hexaluminate lightweight aggregate is inhibited, the interface bonding condition of the alumina hollow spheres and the microporous calcium hexaluminate lightweight aggregate is improved, and the mechanical property of the castable is improved.
Through the comprehensive measures, the invention realizes the purposes of rapid construction and baking and improvement of mechanical strength and heat insulation performance, and various raw materials are common commercial raw materials or waste refractory materials, and have the advantages of easy obtainment of raw materials and low cost. The water-cooling furnace roller heat-insulating lining prepared by the castable disclosed by the invention has the advantages of short maintenance and drying time, excellent heat-insulating property and thermal shock resistance stability, good mechanical property and the like, and not only can effectively reduce the water-cooling heat loss of the high-temperature water-cooling furnace roller of the thin slab continuous casting and rolling tunnel type heating furnace, improve the heat efficiency of the heating furnace, prolong the service life of the furnace roller heat-insulating layer, but also can reduce the drying time of the furnace roller and shorten the repair period.
Drawings
FIG. 1 is a scanning electron microscope photograph of a sample subjected to heat treatment at 1100 ℃ for 3h by using the quick-drying hollow sphere heat-insulating refractory castable in example 1;
FIG. 2 is a scanning electron microscope photograph of a sample subjected to heat treatment at 1100 ℃ for 3h in the quick-drying hollow sphere heat-insulating refractory castable in example 1.
Detailed Description
In order to better explain the invention, the following further illustrate the main content of the invention in connection with specific examples, but the content of the invention is not limited to the following examples.
In the following embodiment, the silicon micropowder is active silicon micropowder with the granularity less than or equal to 500 meshes; the alpha-Al 2 O 3 The granularity of the micro powder is less than or equal to 500 meshes.
Example 1
Quick-drying hollow ball is thermal-insulated resistantThe fire castable comprises the following raw materials in percentage by weight: 40 percent of alumina hollow sphere, 5 percent of microporous calcium hexaluminate lightweight aggregate, 3 percent of floating bead with the granularity of 200 meshes, and nano-silica aerogel powder (the density is less than or equal to 0.05 g/cm) 3 Specific surface area is more than or equal to 600m 2 Per gram) 5 percent, the cyanite powder with the particle size of 120 meshes 8 percent, the first-grade high-aluminum clinker powder with the particle size of 200 meshes 5.37 percent, the refractory fiber 15 percent, the potassium hexatitanate whisker (the diameter is 2 to 4 mu m, the length-diameter ratio is 10 to 20) 2 percent, the silicon micropowder 3 percent and the alpha-Al 2 O 3 13% of micro powder, 0.3% of composite water reducing agent, 0.03% of RK-720F silicon polyether defoaming agent (produced by Xiamen Rui Man chemical technology Co., ltd.), 0.2% of sintered magnesia powder with the granularity of 300 meshes (the MgO content is more than or equal to 98%) and 0.1% of citric acid; in addition, 30% of silica sol was added.
The alumina hollow spheres are in particle grading, and specifically comprise 15 wt% of alumina hollow spheres with the particle size of less than or equal to 5mm and less than 3mm, 17 wt% of alumina hollow spheres with the particle size of less than or equal to 3mm and less than 1mm, 8 wt% of alumina hollow spheres with the particle size of less than or equal to 1mm and less than 0.2mm, and the total amount of the alumina hollow spheres is 40%.
The particle size of the microporous calcium hexaluminate lightweight aggregate is 2-3 mm, and the average pore diameter of the micropores is less than or equal to 6 mu m.
The refractory fiber is prepared from waste zirconium-containing refractory fiber after silicon steel continuous annealing furnace, and is specifically characterized in that the recovered waste zirconium-containing refractory fiber is cut into short fibers of 5-10 mm, and the short fibers are sprayed on the surface of the short fibers by using polyethylene glycol (PEG-4000) aqueous solution with the concentration of 0.7g/100mL for modification treatment.
The composite water reducing agent is a mixture of an FS10 high-efficiency water reducing agent and sodium tripolyphosphate, wherein the FS10 high-efficiency water reducing agent accounts for 90% of the total mass of the composite water reducing agent, and the sodium tripolyphosphate accounts for 10% of the total mass of the composite water reducing agent.
SiO in the silica sol 2 The content is 40 percent, and the PH value is 9.0 to 9.5.
Example 2
A quick-drying hollow sphere heat-insulating refractory castable comprises the following raw materials in percentage by weight: 45 percent of alumina hollow spheres, 7.73 percent of microporous calcium hexaluminate lightweight aggregate and 180-mesh float5 percent of beads and nano silicon dioxide aerogel powder (the density is less than or equal to 0.05 g/cm) 3 Specific surface area is more than or equal to 600m 2 Per gram) 3 percent, the cyanite powder with the particle size of 120 meshes 5 percent, the first-grade high-aluminum clinker powder with the particle size of 200 meshes 8 percent, the refractory fiber 10 percent, the potassium hexatitanate whisker (the diameter is 2 to 4 mu m, the length-diameter ratio is 10 to 20) 2 percent, the silicon micropowder 4 percent, the alpha-Al 2 O 3 10% of micro powder, 0.1% of composite water reducing agent, 0.02% of RK-720F silicon polyether defoaming agent, 0.1% of sintered magnesia powder with the granularity of 300 meshes (the MgO content is more than or equal to 98%), and 0.05% of citric acid; in addition, 20% of silica sol was added.
The alumina hollow spheres are in particle grading, and specifically comprise 14% by weight of alumina hollow spheres with the particle size of less than or equal to 5mm and less than 3mm, 17% by weight of alumina hollow spheres with the particle size of less than or equal to 3mm and less than 1mm, 14% by weight of alumina hollow spheres with the particle size of less than or equal to 1mm and less than 0.2mm, and the total amount of the alumina hollow spheres is 45%.
The particle size of the microporous calcium hexaluminate lightweight aggregate is 2-3 mm, and the average pore diameter of the micropores is less than or equal to 6 mu m.
The refractory fiber is prepared from waste zirconium-containing refractory fiber after silicon steel continuous annealing furnace, and specifically, the recovered waste zirconium-containing refractory fiber is sheared into short fiber with the diameter of 5-10 mm, and the surface of the short fiber is sprayed with polyethylene glycol (PEG-4000) aqueous solution with the concentration of 0.7g/100mL for modification treatment.
The composite water reducing agent is a mixture of an FS10 high-efficiency water reducing agent and sodium tripolyphosphate, wherein the FS10 high-efficiency water reducing agent accounts for 80% of the total mass of the composite water reducing agent, and the sodium tripolyphosphate accounts for 20% of the total mass of the composite water reducing agent.
SiO in the silica sol 2 The content is 40 percent, and the PH value is 9.0 to 9.5.
Example 3
A quick-drying hollow sphere heat-insulating refractory castable comprises the following raw materials in percentage by weight: 35 percent of alumina hollow sphere, 8 percent of microporous calcium hexaluminate lightweight aggregate, 4 percent of floating bead with the granularity of 160 meshes, and nano-silica aerogel powder (the density is less than or equal to 0.05 g/cm) 3 Specific surface area is more than or equal to 600m 2 Per gram) 4 percent, 7.2 percent of kyanite powder with the granularity of 120 meshes and 5 percent of first-grade high-aluminum clinker powder with the granularity of 200 meshes14 percent of refractory fiber, 3 percent of potassium hexatitanate whisker (the diameter is 2 to 4 mu m, the length-diameter ratio is 10 to 20), 4 percent of silicon micropowder and alpha-Al 2 O 3 15% of micro powder, 0.3% of composite water reducing agent, 0.05% of RK-720F silicon polyether defoaming agent, 0.3% of sintered magnesia powder (MgO content is more than or equal to 98%) with the granularity of 300 meshes and 0.15% of citric acid; in addition, 28% of silica sol was added.
The alumina hollow spheres are in particle grading, and specifically comprise 10 wt% of alumina hollow spheres with the particle size of less than or equal to 5mm and less than 3mm, 10 wt% of alumina hollow spheres with the particle size of less than or equal to 3mm and less than 1mm, 15 wt% of alumina hollow spheres with the particle size of less than or equal to 1mm and less than 0.2mm, and the total amount of the alumina hollow spheres is 35%.
The particle size of the microporous calcium hexaluminate lightweight aggregate is 2-3 mm, and the average pore diameter of the micropores is less than or equal to 6 mu m.
The refractory fiber is prepared from waste aluminum silicate refractory fiber after being used in a cold rolling continuous annealing furnace, and specifically, the recovered waste zirconium-containing refractory fiber is cut into short fibers of 5-10 mm, and the short fibers are sprayed on the surface of the refractory fiber by using polyethylene glycol (PEG-4000) aqueous solution with the concentration of 0.7g/100mL for modification treatment.
The composite water reducing agent is a mixture of an FS10 high-efficiency water reducing agent and sodium tripolyphosphate, wherein the FS10 high-efficiency water reducing agent accounts for 85% of the total mass of the composite water reducing agent, and the sodium tripolyphosphate accounts for 15% of the total mass of the composite water reducing agent.
SiO in the silica sol 2 The content is 30 percent, and the PH value is 9.0-9.5.
Example 4
A quick-drying hollow sphere heat insulation refractory castable comprises the following raw materials in percentage by weight: 38 percent of alumina hollow sphere, 8 percent of microporous calcium hexaluminate lightweight aggregate, 4 percent of floating bead with the granularity of 80 meshes, and nano-silica aerogel powder (the density is less than or equal to 0.05 g/cm) 3 The specific surface area is more than or equal to 600m 2 Per gram) 5 percent, the cyanite powder with the particle size of 80 meshes 6 percent, the first-grade high-aluminum clinker powder with the particle size of 200 meshes 6.54 percent, the refractory fiber 12 percent, the potassium hexatitanate whisker (the diameter is 2 to 4 mu m, the length-diameter ratio is 10 to 20) 3 percent, the silicon micropowder 2 percent, the alpha-Al 2 O 3 15 percent of micro powder, 0.2 percent of composite water reducing agent and RK-720F silicon polyether0.03 percent of foaming agent, 0.15 percent of sintered magnesia powder with the granularity of 300 meshes (the content of MgO is more than or equal to 98 percent) and 0.08 percent of citric acid; in addition, silica sol was added in an amount of 25%.
The alumina hollow spheres are in particle grading, and specifically comprise 11 wt% of alumina hollow spheres with the particle size of less than or equal to 5mm and less than 3mm, 18 wt% of alumina hollow spheres with the particle size of less than or equal to 3mm and less than 1mm, 9 wt% of alumina hollow spheres with the particle size of less than or equal to 1mm and less than 0.2mm, and the total content is 38% of the alumina hollow spheres.
The particle size of the microporous calcium hexaluminate lightweight aggregate is 2-3 mm, and the average pore diameter of the micropores is less than or equal to 6 mu m.
The refractory fiber is prepared from waste aluminum silicate refractory fiber after being used in a cold rolling continuous annealing furnace, and specifically, the recovered waste zirconium-containing refractory fiber is cut into short fibers of 5-10 mm, and the short fibers are sprayed on the surface of the refractory fiber by using polyethylene glycol (PEG-4000) aqueous solution with the concentration of 0.7g/100mL for modification treatment.
The composite water reducing agent is a mixture of an FS10 high-efficiency water reducing agent and sodium tripolyphosphate, wherein the FS10 high-efficiency water reducing agent accounts for 75% of the total mass of the composite water reducing agent, and the sodium tripolyphosphate accounts for 25% of the total mass of the composite water reducing agent.
SiO in the silica sol 2 The content is 30 percent, and the PH value is 9.0-9.5.
Example 5
A quick-drying hollow sphere heat-insulating refractory castable comprises the following raw materials in percentage by weight: 41 percent of alumina hollow spheres, 6.54 percent of microporous calcium hexaluminate lightweight aggregate, 5 percent of floating beads with the granularity of 200 meshes, and nano-silica aerogel powder (the density is less than or equal to 0.05 g/cm) 3 The specific surface area is more than or equal to 600m 2 5 percent/g), 5 percent of cyanite powder with the granularity of 80 meshes, 8 percent of first-grade high-aluminum clinker powder with the granularity of 200 meshes, 10 percent of refractory fiber, 2 percent of potassium hexatitanate whisker (the diameter is 2 to 4 mu m, the length-diameter ratio is 10 to 20), 3 percent of silicon micropowder, alpha-Al 2 O 3 14 percent of micro powder, 0.2 percent of composite water reducing agent, 0.03 percent of RK-720F silicon polyether defoaming agent, 0.15 percent of sintered magnesia powder with the granularity of 300 meshes (the MgO content is more than or equal to 98 percent) and 0.08 percent of citric acid; in addition, 23% of silica sol was added.
The aluminum oxide hollow sphere is in a particle grading structure, and specifically comprises 15 wt% of aluminum oxide hollow spheres with the particle size of less than or equal to 5mm and less than 3mm, 16 wt% of aluminum oxide hollow spheres with the particle size of less than or equal to 3mm and less than 1mm, 10 wt% of aluminum oxide hollow spheres with the particle size of less than or equal to 1mm and less than 0.2mm, and the total content of the aluminum oxide hollow spheres is 41%.
The particle size of the microporous calcium hexaluminate lightweight aggregate is 2-3 mm, and the average pore diameter of the micropores is less than or equal to 6 mu m.
The refractory fiber is prepared from waste zirconium-containing refractory fiber after silicon steel continuous annealing furnace, and is specifically characterized in that the recovered waste zirconium-containing refractory fiber is cut into short fibers of 5-10 mm, and the short fibers are sprayed on the surface of the short fibers by using polyethylene glycol (PEG-4000) aqueous solution with the concentration of 0.7g/100mL for modification treatment.
The composite water reducing agent is a mixture of an FS10 high-efficiency water reducing agent and sodium tripolyphosphate, wherein the FS10 high-efficiency water reducing agent accounts for 85% of the total mass of the composite water reducing agent, and the sodium tripolyphosphate accounts for 15% of the total mass of the composite water reducing agent.
SiO in the silica sol 2 The content is 40 percent, and the PH value is 9.0 to 9.5.
Performance testing
The quick-drying hollow sphere heat-insulating refractory castable in the embodiments 1 to 5 is prepared respectively, and a 160mm × 40mm × 40mm standard sample is prepared, and is detected after natural curing, demolding and heat treatment, and the reference standard is adopted: GB/T3001-2007 and YB/T5291-1999), the detection data are shown in Table 1.
TABLE 1 quick-drying hollow ball heat insulation refractory castable sample performance index
Figure BDA0003263821390000081
Figure BDA0003263821390000091
As can be seen from table 1: the bulk density of each sample is 1.20-1.35 g/cm 3 The flexural strength of the steel is respectively obtained after drying at 110 ℃ for 24h and heat treatment at 1100 ℃ for 3hThe heat-insulating performance of the castable is better than or equal to 1.8MPa and 3.5MPa, the heat conductivity coefficient (hot surface temperature 800 ℃) is less than or equal to 0.23W/m.K, and the heat-insulating performance is superior to the performance indexes of the castable for the water-cooling furnace roller reported by related data (such as ' the castable for the furnace roller of a roller hearth furnace ', an authorized notice No. CN100408515C, ' the light heat-insulating castable for the furnace roller of the light heat-insulating furnace ', a publication No. CN101792294A, ' the light castable for the CSP furnace roller, and a publication No. CN 102161593A).
The scanning electron micrographs of the 1100 ℃ X3 h heat-treated sample in example 1 are shown in FIGS. 1-2, from which it can be seen that: the hollow spheres are well combined with the matrix, and the fibers have good reinforcing and toughening effects.
Further, on the basis of the above, the quick-drying hollow sphere heat-insulating refractory castable of examples 1 to 5 was subjected to industrial test application, wherein the casting molding of the high-temperature water-cooled furnace roller heat-insulating lining of the thin slab continuous casting and continuous rolling tunnel heating furnace was respectively carried out, and the demoulding was carried out after 24 hours of curing, compared with the heavy furnace roller castable (density 2.3 g/cm) combined with aluminate cement 3 ) In other words, the natural curing time after demoulding is shortened from 48 to 72 hours to 0 to 12 hours; the furnace roller is made of a heavy furnace roller castable material combined with aluminate cement, the temperature is slowly raised to 200 ℃ at the heating rate of 10 ℃/h during baking, then the furnace is shut down, the furnace is naturally cooled to below 70 ℃, and a furnace door is opened; the furnace roller of the quick-drying hollow sphere heat-insulating refractory castable disclosed by the invention can be heated to 200 ℃ at a heating rate of 10 ℃/min during baking, and is kept warm for 4-5 hours at 200 ℃, so that quick heating baking is realized, the drying time is shortened to be within 6 hours from 30 hours, and the furnace roller has the advantages of short curing and drying time, excellent heat-insulating property and thermal shock resistance stability, good mechanical property and the like, is applied to heat-insulating protection of a high-temperature water-cooling furnace roller of a sheet billet continuous casting and rolling tunnel type heating furnace, and achieves good effects of reducing water-cooling heat loss, improving the heat efficiency of the heating furnace, shortening the construction period and the like.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and changes can be made without departing from the inventive concept of the present invention, and these modifications and changes are within the protection scope of the present invention.

Claims (8)

1. A quick-drying hollow sphere heat-insulation refractory castable is characterized by comprising the following raw materials in percentage by weight: 35 to 45 percent of alumina hollow sphere, 5 to 8 percent of microporous calcium hexaluminate lightweight aggregate, 3 to 5 percent of floating bead, 3 to 5 percent of nano silica aerogel powder, 5 to 8 percent of kyanite powder, 5 to 8 percent of first-grade high alumina clinker powder, 10 to 15 percent of refractory fiber, 2 to 3 percent of potassium hexatitanate whisker, 2 to 4 percent of silicon micropowder, alpha-Al 2 O 3 10 to 15 percent of micro powder, 0.1 to 0.3 percent of composite water reducing agent, 0.02 to 0.05 percent of water-based silicon polyether defoaming agent, 0.1 to 0.3 percent of coagulant and 0.05 to 0.15 percent of retarder; in addition, the silicon sol is added in an external form, and the adding amount accounts for 20 to 30 percent of the total mass of other raw materials;
the alumina hollow sphere is in particle grading, and specifically comprises: 10 to 15 weight percent of alumina hollow spheres with the granularity being less than or equal to 5mm and 3mm, 10 to 18 weight percent of alumina hollow spheres with the granularity being less than or equal to 3mm and 8 to 15 weight percent of alumina hollow spheres with the granularity being less than or equal to 1mm and 0.2 mm;
the particle size of the floating bead is 80 to 200 meshes; the coagulant is sintered magnesia powder; the retarder is citric acid; siO in the silica sol 2 The content is 30 to 40 percent, and the PH value is 9.0 to 9.5;
the surface of the refractory fiber is sprayed with a polyethylene glycol aqueous solution with the concentration of 0.7 to 0.8g/100mL for modification treatment; the granularity of the microporous calcium hexaluminate lightweight aggregate is 2 to 3mm, and the average pore diameter of micropores is less than or equal to 6 mu m.
2. The quick-drying hollow sphere heat-insulating refractory castable according to claim 1, wherein the granularity of the sapphire powder is 80-120 meshes; the granularity of the first-grade high-aluminum clinker powder is less than or equal to 200 meshes.
3. The quick-drying hollow sphere heat-insulating refractory castable according to claim 1, wherein the density of the nano silica aerogel powder is less than or equal to 0.05g/cm 3 The specific surface area is more than or equal to 600m 2 /g。
4. The quick-drying hollow sphere heat-insulating refractory castable according to claim 1, wherein the refractory fiber is prepared from waste refractory fiber after being used in a metallurgical furnace, specifically, the recovered waste zirconium-containing refractory fiber or aluminum silicate refractory fiber is cut into short fibers of 5-10mm, and the surfaces of the short fibers are sprayed with polyethylene glycol aqueous solution with the concentration of 0.7-0.8g/100 mL for modification treatment.
5. The quick-drying hollow sphere heat-insulating refractory castable according to claim 1, wherein the potassium hexatitanate whisker has a diameter of 2 to 4 mm and a length-diameter ratio of 10 to 20.
6. The quick-drying hollow sphere heat-insulating refractory castable according to claim 1, wherein the silica micropowder is active silica micropowder with a particle size of less than or equal to 500 meshes, and the alpha-Al is 2 O 3 The granularity of the micro powder is less than or equal to 500 meshes.
7. The quick-drying hollow sphere heat-insulating refractory castable according to claim 1, characterized in that the compound water reducing agent is a mixture of an FS10 high-efficiency water reducing agent and sodium tripolyphosphate, wherein the FS10 high-efficiency water reducing agent accounts for 75-90% of the total mass of the compound water reducing agent, and the sodium tripolyphosphate accounts for 10-25% of the total mass of the compound water reducing agent.
8. The quick-drying hollow sphere heat-insulating refractory castable according to claim 1, wherein the sintered magnesia powder has an MgO content of not less than 98% and a particle size of not more than 300 meshes.
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