CN102924099B - Refractory and thermal-insulating spray coating material and preparation method and application thereof - Google Patents
Refractory and thermal-insulating spray coating material and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a refractory and thermal-insulating spray coating material, and a preparation method and an application thereof. The refractory and thermal-insulating spray coating material comprises two parts, namely a prefabricated slurry and a curing agent, wherein the prefabricated slurry is prepared with a refractory aggregate and a binder; the weight of the refractory aggregate is 60-63 percent of the total weight of the refractory and thermal-insulating spray coating material; the weight of the binder is 34-37 percent of the total weight of the refractory and thermal-insulating spray coating material; and the weight of the curing agent is 3-6 percent of the total weight of the refractory and thermal-insulating spray coating material. According to the preparation method, the refractory and thermal-insulating spray coating material is prepared by evenly mixing the weighed refractory aggregate, the weighed binder and the weighed curing agent in sequence. A large-aperture spray gun for spraying coarse sand is adopted for quickly spraying the uniformly stirred slurry onto the surface of the inner wall of a furnace lining to prevent the slurry from being cured due to long-term storage, and then the refractory and thermal-insulating spray coating material is put into production directly. The refractory and thermal-insulating spray coating material has high interfacial bonding strength with the furnace lining, high resistance against furnace gas erosion, excellent thermal shock stability and high infrared radiance.
Description
Technical field
The present invention relates to refractory heat-insulating spray material, refer to particularly a kind of for heat insulation refractory heat-insulating spray material in heater for rolling steel furnace lining hot working face and preparation method thereof and application.
Background technology
Energy and environment problem is the major issue that modern society pays close attention to, and is also one of fast-developing subject matter of restriction iron and steel enterprise.Energy-saving and cost-reducing and minimizing discharge is the inevitable choice of iron and steel enterprise's technical progress and Sustainable development.Process furnace is key equipment and the big power consumer of hot rolling of steel billet, and its energy consumption accounts for 75～80% of Energy Consumption of Rolling Process, thereby, be the key factor that affects hot rolling of steel billet process energy consumption at reheating furnace energy-saving.For this reason, carry out a large amount of work with regard to Energy Saving In Reheating Furnaces For Roling technology both at home and abroad, wherein, process furnace furnace lining strengthening thermal isolation technique is clear as a theory, the energy-efficient measure of technology maturation is at home and abroad used widely, especially do not carrying out under the condition of process furnace furnace wall transformation, improve the heat insulation thermal resistance of process furnace furnace lining inwall and the power-saving technology of hot working face infrared signature, simple and direct with its construction, less investment, instant effect, the features such as energy-saving effect is outstanding, obtain the favor of lot of domestic and foreign iron and steel enterprise, successively there is a large amount of documents and materials reports, as:
Publication number is: the Chinese invention patent of CN101113097A discloses infrared radiation porous ceramics and the preparation method on a kind of furnace lining firebrick, this invention provide a kind of can be at 950～1200 ℃ of temperature sintering and have infrared radiation porous ceramics that the normal direction total emissivity of some strength, low density, low thermal conductivity, the full infrared band of 2.5～20 μ m is high and preparation method thereof, adopt the wide aperture spray gun of conventional spray coarse sand to carry out spray, can form infrared radiation porous ceramics layer in furnace lining firebrick inner wall surface.Wherein, infrared radiation porous ceramics, be prepared into slurry by aggregate and binding agent, the weight percent of aggregate raw material is: lightweight is floated pearl: 20～45%, Suzhou soil: 20～40%, aluminium sesquioxide microballon: 5～15%, magnesium oxide: 5～12%, high emissivity material: 5～15%, coal dust: 1～5%; Wherein, the weight percent of high emissivity material is: ferric oxide: 42～48%, Manganse Dioxide: 20～30%, cobalt sesquioxide: 8～14%, cupric oxide: 8～13% and cerium dioxide: 7～12%, after mixing, under 1260～1300 ℃ of conditions, sintering 0.8～2h makes.The particle of aluminium sesquioxide microballon is 100～180 orders.The weight percent of binding agent raw material is: silicochromium aluminium complex sol: 80～90%, and silicone resin: 10～20%, described binding agent and aggregate weight percent are 33～42% and 58～67%.The preparation method of described porous ceramics comprises the following steps successively: 1), by Suzhou soil, magnesium oxide, high emissivity material ball milling respectively, leach abrading-ball, leave standstill 30～60min minute, remove after ball milling liquid; Under 130～200 ℃ of temperature condition, dry respectively; Then fine ground respectively, 280～320 orders that sieve, preserve respectively stand-by; 2) the molecule lightweight of preparing closed pores is floated pearl: flyash is poured in pond and fully stirred, then allow its natural sedimentation, fish for the material that swims in the water surface, dry, preserve stand-by; 3) aggregate configuration: pore-forming material lightweight is floated pearl by weight proportion: 20～45%, Suzhou soil: 20～40%, aluminium sesquioxide microballon: 5～15%, magnesium oxide: 5～12%, high emissivity material: 5～15% and coal dust: 1～5%, mixing and stirring, preserves stand-by; 4) substrate pretreated: remove the lip-deep floating dust of furnace lining firebrick and ash, sand; 5) slurry configuration: be 33～42% and 58～67% to be configured by the weight percent of binding agent and aggregate, stirring is until evenly stand-by; 6) spray: adopt the wide aperture spray gun of spray coarse sand, the slurry stirring is injected on furnace lining firebrick; 7) dry in the shade; 8) sintering: solidify with baker heat-agglomerating.Therefore, the infrared radiation porous ceramics of this patent is owing to floating in a large number pearl and transition metal oxide, reduce the refractoriness of infrared radiation porous ceramics, life-time service temperature≤1200 ℃, be difficult to meet the heat working condition requirement of heater for rolling steel, meanwhile, a large amount of introducings of rare earth and noble heavy metal oxide, the infrared radiation porous ceramics cost of this patent is sharply increased, affected the economic effects of energy-saving of practical application.
Publication No. is that the Chinese invention patent of CN102503465A discloses a kind of light thermal insulation sprayed material, and this jetting material comprises pearlstone, the low aluminium aggregate of lightweight, raw clay, high-alumina cement, silicon powder, composite additive and water glass.Wherein, composite additive is made up of tetracalcium aluminoferrite and slaked lime, has advantages of that tack is good, bounce-back rate is low, can be used as working lining and the insulating of middle low temperature stove Thermal Equipment." blast funnace hot blast stove is with heat insulation for Chinese patent, high-intensity fiber jetting material, publication number is that the Chinese invention patent of CN200610017726.1 discloses a kind of blast funnace hot blast stove with heat insulation, high-intensity fiber jetting material, in the raw material of this jetting material, containing granularity is the high-alumina lightening material of 0～5mm: 45～65%, granularity is 180～325 object flint clay powder: 10～30%, granularity is 180～325 object ground silicas: 5～20%, granularity is 180～325 object aluminate cements: 15～30%, granularity is the aluminum silicate fiber suede of 0～5 μ m: 5～15%, additional polymerize aluminum chloride: 0.1～1.8% and aluminous refractory cement: 18～29%.Take by weight percentage after the raw material except polymerize aluminum chloride, aluminous refractory cement, then add polymerize aluminum chloride, aluminous refractory cement, after fully mixing, get product.Visible according to above-mentioned two patent reports, patented technology has that bounce-back rate is low, and heat conductivility is low, the feature of high insulating effect, but because of the low deficiency of use temperature, can not meet the heat working condition requirement of heater for rolling steel.
Yellow schools in 2004 etc. are energy-conservation in≤Guangxi >=deliver " multicrystal mullite refractory fabrics and infrared spray material are combined in application on willow rod iron line factory walking-beam furnace and energy-conservation point ", this paper has reported that employing polycrystalline mullite fibre pastes on walking beam furnace furnace wall and water-cooled beam working face, and in the reducing energy consumption of fiber surface spraying high-temperature far infrared paint, effectively reduce water-cooled loss, furnace wall heat lost by radiation, obtain the excellent results that reduces process furnace energy consumption 8.42Kgce/t steel, but in actual production, also there is shrinkage crack between fiber block, fiber washes away and comes off, thermal shock is peeled off etc. not enough.Zhang Chunhong in 2008 is at≤industrial furnace >=delivered " polycrystalline mullite fibre is in the application of heat accumulating type walking beam ", this paper the detailed construction technical essential of pasting multicrystal mullite fabrics stickup lump and fiber block surface spraying solidifying agent on double heat storage type walking beam reheating furnace inboard wall of burner hearth and water beam surface, obtain reinforcement furnace insulation, reduce the heat that body of heater surface radiating and water coolant are taken away, extend converter life, improve the excellent results of furnace temperature and thermo-efficiency, wherein, furnace roof and furnace wall appearance temperature-averaging have declined 60.7 ℃, ton steel fuel cost declines 2.7 yuan, burner block, furnace roof, can extend to more than 2 years the work-ing life of water beam wrapping.Liu Yun in 2011 weighing apparatus is at≤industrial furnace >=delivered " polycrystalline mullite fibre is in the application of rotary heating furnace ", this paper characteristic and the constructional method thereof of polycrystalline mullite fibre, comparative analysis the furnace wall temperature pasted before and after polycrystalline mullite fibre paste block of rotary heating furnace furnace lining change, structure shows, after fiber is pasted, the medial temperature of process furnace inner and outer rings furnace wall steel plate and furnace roof has reduced respectively 9.8 ℃, 14.1 ℃ and 37.2 ℃, effectively reduce body of heater surface radiating, through measuring and calculating, year can be saved 500,000 yuan of left and right of combustion gas cost; Simultaneously, stove stop production, open (until) heating-cooling speed while rolling accelerates, shorten the heat-up time of blank, reduce the scaling loss of blank in process furnace, improve the unit output of stove, amount of oxidation loss has been reduced to present 1.342% by original 1.5%, adapted to preferably produce unsaturated, frequently stop the situation that (treating) produces; But the fiber paste block that finds that there is 15% left and right in the blowing out inspection in operation after 1 year 10 months comes off.According to above-mentioned paper report, heater for rolling steel furnace lining inwall polycrystalline mullite paste block and surperficial infrared radiating coating thereof have reached the loss of reduction furnace wall surface heat, improve the expection object of thermal efficiency of heating furnace, but paste block peels off, construction is complicated, the deficiencies such as cost costliness, affect its economic effects of energy-saving, simultaneously, life-time service temperature≤1350 ℃ of polycrystalline mullite fibre, for the polycrystalline alumina fiber of current use temperature >=1600 ℃, because it is easily crisp, staple length is short, the reasons such as diameter is tiny, also there is no at present the full fiber paste block of polycrystalline alumina fiber goods, thereby, report technology can't meet the service requirements of the heater for rolling steel of Heating temperature >=1350 ℃.
Based on the good heat preservation and insulation of refractory fibre, as far back as the end of the seventies in last century, fiber coating technology has successively been invented by some technology developed countries, and import China into the end of the eighties in last century, and be applied on the middle low-temperature heat stove of petrochemical industry and the middle low-temperature heat treatment stove of metallurgy industry, obtain the construction of simplification fibre furnace lining, improve layer of fibers bonding strength, the effect that extends fibre furnace lining work-ing life etc., the Chinese invention patent that the publication number of applying in China as Man Wei company of the U.S. is CN87103966A discloses a kind of method and consequent flame retardant coating of surface spraying flame retardant coating, provide a kind of tackiness agent and refractory fibrous material that adopts Alpha-alumina (corundum) crystal composition to spray to surperficial method and consequent flame retardant coating, flame retardant coating working temperature height is subject to the restriction of used refractory fibre working temperature.Because refractory fiber spraying bounce-back rate is high and polycrystalline refractory fiber is expensive, thereby, spray coating technique of refractory fiber only adopts conventional ceramic fiber to carry out spraying application, life-time service temperature≤1200 ℃ that fiber coating layer is the highest, for the polycrystalline alumina fiber of current use temperature >=1600 ℃, due to its easy crisp, reason such as staple length is short, diameter is tiny, can not carry out refractory fiber spraying.
Visible according to above-mentioned related data report, in the heat insulation strengthening of existing high temperature heater for rolling steel furnace lining inwall and radiance develop skill, mainly contain the heat insulation intensifying technology take polycrystalline mullite fibre paste block and surperficial infrared radiating coating thereof as representative, but, due to polycrystalline mullite fibre paste block and former furnace lining interface bond strength low, all exist degree different come off, the deficiency such as erosion and filament contraction crack, cause that work-ing life is short, industrial furnace thermal property degradation speed is fast, affected the operational stability of industrial furnace.For the furnace lining inwall heat-insulating technique of lightweight heat-proof spray material, in order to improve the bonding strength of coating and furnace lining inner wall surface, generally need add a large amount of sintering to promote material, being convenient to sprayed coating is firmly combined at ceramic interface with furnace lining formation, often use temperature is lower, be difficult to meet the applied at elevated temperature performance requriements of heater for rolling steel, yet there are no so far the related data report of heat insulation spray finishing material in the application of high temperature heater for rolling steel furnace lining inwall.
Summary of the invention
The object of the invention is the defect for prior art, and a kind of refractory heat-insulating spray material and preparation method thereof and application are provided.The present invention has that coating is simple, spraying application is convenient and sprayed coating use temperature and intensity is high, strong with large, the anti-furnace gas scouring capability of furnace lining interface bond strength, thermal shock resistance is excellent, infrared emittance high.
For solving the problems of the technologies described above, the invention provides a kind of refractory heat-insulating spray material, it comprises prefabricated slurry and solidifying agent two portions, described prefabricated slurry is formed by refractory aggregate and binder making, and the per-cent of described each component in refractory heat-insulating spray material gross weight is: 60～63% refractory aggregates, 34～37% binding agents, 3～6% solidifying agent; Wherein, described refractory aggregate is by weight percentage again by 54～57% alumina hollow balls, 6～9% kyanites, 20～23% high-alumina powder clinkers, 4～7% silicon powders, 5～8% α-Al
2o
3micro mist, 3～6%Cr
2o
3micro mist, 5～8% polycrystalline alumina fiber compositions.
Further, described alumina hollow ball granularity is 1～0.1mm, and kyanite granularity is 80～100 orders, and high alumina Powder Particle Size is 180～250 orders, polycrystalline alumina fiber length≤8mm, silicon powder granularity d
50≤ 5 μ m, α-Al
2o
3micro mist granularity d
50≤ 10 μ m, Cr
2o
3micro mist granularity d
50≤ 15 μ m, more further, Al in described high-alumina powder clinker
2o
3content is greater than 85%.
Again further, described binding agent is made up of 59.7～80% phosphate dihydrogen aluminum solutions, 19.7～40% water, 0.05～015%FS20 water reducer, 0.05～015% chromic trioxide by weight percentage, and wherein the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
Again further, described solidifying agent is aluminous cement.
The present invention also provides a kind of preparation method of described refractory heat-insulating spray material, comprises the following steps:
1) by described refractory aggregate weight percent meter, take 54～57% alumina hollow balls, 6～9% kyanites, 20～23% high-alumina powder clinkers, 4～7% silicon powders, 5～8% α-Al
2o
3micro mist, 3～6%Cr
2o
3micro mist, 5～8% polycrystalline alumina fibers, be placed in stirrer and be uniformly mixed, and wherein, polycrystalline alumina fiber is to adopt mesh screen to sieve while stirring the mode adding to add in stirrer, until stir, preserves stand-by;
2) ratio in refractory heat-insulating spray material gross weight in each component, takes 60～63% refractory aggregates, 34～37% binding agents, 3～6% solidifying agent for subsequent use;
3) binding agent is added to stirred pot, then add refractory aggregate while stirring, until stir, obtain prefabricated slurry, pack container sealing into for subsequent use;
4) solidifying agent is packed in reservoir and sealed, and preserve together with prefabricated slurry, when use, solidifying agent is mixed with prefabricated slurry, can obtain refractory heat-insulating spray material.
As preferred version, described step 2) in, binding agent is made up of 74.8% phosphate dihydrogen aluminum solution, 25% water, 0.1%FS20 water reducer, 0.1% chromic trioxide by weight percentage, and wherein the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
As preferred version, in described step 3), solidifying agent adopts aluminous cement.
The present invention also provides a kind of application method of described refractory heat-insulating spray material, comprises the following steps:
1) construction furnace lining surface treatment: adopt steel brush, the low bulk dross thing of perching knife cleaning cohesive strength, then purge surperficial floating dust with pressurized air;
2) the on-the-spot preparation of spray material: solidifying agent is poured in prefabricated slurry, stirred, obtain refractory heat-insulating spray material;
3) spraying application: adopt the wide aperture spray gun of spray coarse sand, in time the refractory heat-insulating spray material stirring is sprayed on to furnace lining inner wall surface, solidify coating thickness 5～50mm with long-time placement of slurry-free;
4) solidify: under normal temperature atmospheric condition, solidify voluntarily 0.5～2h;
5) production and application: can directly put into production after solidifying.
Main component effect in described refractory heat-insulating spray material:
Alumina hollow ball: the main aggregate composition that alumina hollow ball is spray material, its hollow globosity makes sprayed coating have higher sealed porosity rate, thereby reduces spray material volume density and coating thermal conductivity, improves coating heat preservation and insulation; The alumina content that it is high-purity, has improved fire performance and the erosion-resisting characteristics of coating, has met the service requirements under coating high-temp aggressive conditions.
The control of alumina hollow ball granularity, is convenient to the improvement of wet spray construction and heat-proof quality; The variation of additional proportion, volume density, heat-proof quality and the bonding strength of capable of regulating coating.
Kyanite: as a kind of high-temperature expansion material of cheapness, made up coating high-temp sintering shrinkage, improved the volume stability of coating, prevented the shrinkage crack of coating and come off.
High-alumina powder clinker: as the main stuffing of sprayed coating, strengthened the filling of hole between alumina hollow ball, promoted the combination compactness between hollow ball, and with its low impurity content, guaranteed fire performance and the erosion-resisting characteristics of coating.
Silicon powder and α-Al
2o
3micro mist: as secondary combined material, by gelation, improve coating normal temperature bonding strength, by silicon powder and α-Al
2o
3the pyroreaction of micro mist forms mullite, improves the high temperature bond intensity of coating.
Cr
2o
3micro mist (being commonly called as chrome green micro mist): by with the reacting of the oxide compound of iron in furnace gas, form high-melting-point chromohercynite, not only improved the erosion-resisting characteristics of coating, also improved the infrared radiation property of coating simultaneously.
Polycrystalline alumina fiber: by the high-content Al of filamentary material
2o
3, the high temperature resistant property of raising coating, by fiber reinforcement technology, improves mechanical strength and the thermal shock resistance energy of coating.
D
50: corresponding particle diameter when the cumulative particle sizes percentile of a sample reaches 50%.Its physical significance is that the particle that particle diameter is greater than it accounts for 50%, and the particle that is less than it also accounts for 50%, d
50also be meso-position radius or median particle diameter.D
50be commonly used to represent the mean particle size of powder.
In addition, in bonding agent, phosphate dihydrogen aluminum solution by with the normal-temperature reaction of solidifying agent pure calcium aluminate cement, improve the normal temperature bonding strength and the set time that shortens coating of coating, improve the workability of spray material; By the dissemination of FS20 water reducer, improve flowing property and the workability of coating, reduce coating water content and dry steam output, having promoted the infiltration to spraying matrix of phosphate dihydrogen aluminum solution and micro mist colloidal sol simultaneously, having strengthened the interface bond strength of coating and matrix; By chromic trioxide (CrO
3) restraining effect to chemical reaction between phosphate dihydrogen aluminum solution and irony impurity, improve the efficient of phosphate dihydrogen aluminum solution, improve the shelf stability of spray material and the bonding properties of coating.
Feature of the present invention:
1, the present invention adopts the fireproof raw material that foreign matter content is low to be prepared, there is the good feature of high temperature resistant property, life-time service temperature can reach more than 1550 ℃, can meet the service requirements of different heating temperature heater for rolling steel furnace lining inwall direct spraying thermofin, overcome that the heat insulation mode of heater for rolling steel polycrystalline mullite fibre paste block and surface cure coating tradition exists peel off, erosion and the deficiency such as the heat-proof quality rate of decay is fast.
2, to have adopted hollow alumina hollow ball be main heat insulation starting material in the present invention, have typical closed gas pore structure, thereby thermal conductivity is low, and heat-proof quality is good, can significantly reduce heater for rolling steel furnace wall outer wall surface temperature and heat lost by radiation.
3, to adopt aluminium dihydrogen phosphate be bonding agent main raw material in the present invention, at silicon powder and α-Al
2o
3under the secondary combined effect of micro mist, bonding strength is high, and antiscour wearing and tearing ability is strong.
4, to adopt polycrystalline alumina fiber be the auxiliary lagging material of spray material and coating enhancing toughening material in the present invention, mechanical property and the thermal shock resistance energy of coating are effectively improved, promote the effect of heat insulation of coating, overcome polycrystalline alumina fiber because of easy crisp, the deficiency that can not use separately that staple length is short, diameter is tiny etc. causes simultaneously, open up the use pattern of polycrystalline alumina fiber, given full play to the advantage that polycrystalline alumina fiber refractoriness is high, heat-proof quality is good.
5, Cr in the present invention
2o
3adding of micro mist, by being sprayed on the Cr in heater for rolling steel furnace lining inner wall surface coating
2o
3the chromohercynite that chemical reaction in micro mist and furnace gas between the oxide compound of iron forms, has not only improved refractoriness and the use temperature of coating, has also improved the infrared emittance of coating, radiative transfer in strengthening stove simultaneously.
6, the present invention adopts various starting material to be commercially available material, adopts wet spray construction, has that starting material source is wide, cheap, preparation and the simple feature of constructing.
Accompanying drawing explanation
Fig. 1 is the morphology of refractory heat-insulating spray material sample of the present invention;
Fig. 2 is the spectral emittance graphic representation through SEM-1 infra-red material emittance device measuring.
Embodiment
In order to explain better the present invention, further illustrate main contents of the present invention below in conjunction with specific embodiment, but content of the present invention is not only confined to following examples.
Embodiment 1:
A kind of refractory heat-insulating spray material, it comprises prefabricated slurry and solidifying agent two portions, described prefabricated slurry is formed by refractory aggregate and binder making, and the per-cent of described each component in refractory heat-insulating spray material gross weight is: 61% refractory aggregate, 36% binding agent, 3% solidifying agent; Wherein, described refractory aggregate is by weight percentage by 56% alumina hollow ball, 6% kyanite, 20% high-alumina powder clinker, 4% silicon powder, 5% α-Al
2o
3micro mist, 4%Cr
2o
3micro mist, 5% polycrystalline alumina fiber composition.
Described binding agent is made up of 74.8% phosphate dihydrogen aluminum solution, 25% water, 0.1%FS20 water reducer, 0.1% chromic trioxide by weight percentage, and wherein, the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
The same materials using in the present embodiment and following examples is marketable material, and wherein, described alumina hollow ball granularity is 1～0.1mm, kyanite granularity is 80～100 orders, high alumina Powder Particle Size is 180～250 orders, polycrystalline alumina fiber length≤8mm, silicon powder granularity d
50≤ 5 μ m, α-Al
2o
3micro mist granularity d
50≤ 10 μ m, Cr
2o
3micro mist granularity d
50≤ 15 μ m.
Al in described high-alumina powder clinker
2o
3content is greater than 85%.Described solidifying agent is aluminous cement.
The present invention also provides a kind of preparation method of described refractory heat-insulating spray material, comprises the following steps:
1) by described refractory aggregate weight percent meter, take 54～57% alumina hollow balls, 6～9% kyanites, 20～23% high-alumina powder clinkers, 4～7% silicon powders, 5～8% α-Al
2o
3micro mist, 3～6%Cr
2o
3micro mist, 5～8% polycrystalline alumina fibers, be placed in stirrer and be uniformly mixed, and wherein, polycrystalline alumina fiber is to adopt mesh screen to sieve while stirring the mode adding to add in stirrer, until stir, preserves stand-by;
2) ratio in refractory heat-insulating spray material gross weight in each component, takes 60～63% refractory aggregates, 34～37% binding agents, 3～6% solidifying agent for subsequent use;
3) binding agent is added to stirred pot, then add refractory aggregate while stirring, until stir, obtain prefabricated slurry, pack container sealing into for subsequent use;
4) solidifying agent is packed in reservoir and sealed, and preserve together with prefabricated slurry, when use, solidifying agent is mixed with prefabricated slurry, can obtain refractory heat-insulating spray material.
The present invention also provides a kind of application method of described refractory heat-insulating spray material, comprises the following steps:
1) construction furnace lining surface treatment: adopt steel brush, perching knife cleaning bonding is slight low bulk dross thing, then purge surperficial floating dust with pressurized air;
2) the on-the-spot preparation of spray material: solidifying agent is poured in prefabricated slurry, stirred, obtain refractory heat-insulating spray material;
3) spraying application: adopt the wide aperture spray gun of spray coarse sand, in time the refractory heat-insulating spray material stirring is sprayed on to furnace lining inner wall surface, solidify coating thickness 5～50mm with long-time placement of slurry-free;
4) solidify: under normal temperature atmospheric condition, solidify voluntarily 0.5～2h;
5) production and application: can directly put into production after solidifying.
From Fig. 1 and table 1, table 2, refractory heat-insulating spray material sealed porosity rate of the present invention is high, be evenly distributed, and heat-proof quality is good, and mechanical strength is high, and anti-airflow scouring ability is strong.
The thermal conductivity that table 1 the present embodiment flat band method is measured
Temperature (℃) 100 300 600 900
Thermal conductivity (w/mK) 0.091 0.157 0.283 0.315
Table 2 the present embodiment refractory heat-insulating spray material physical detection result
Embodiment 2
A kind of refractory heat-insulating spray material, it comprises prefabricated slurry and solidifying agent two portions, described prefabricated slurry is formed by refractory aggregate and binder making, and the per-cent of described each component in refractory heat-insulating spray material gross weight is: 60% refractory aggregate, 34% binding agent, 6% solidifying agent; Wherein, described refractory aggregate is by weight percentage by 55% alumina hollow ball, 7% kyanite, 20% high-alumina powder clinker, 4% silicon powder, 5% α-Al
2o
3micro mist, 3%Cr
2o
3micro mist, 6% polycrystalline alumina fiber composition.
Described binding agent is made up of 80% phosphate dihydrogen aluminum solution, 19.8% water, 0.05%FS20 water reducer, 0.15% chromic trioxide by weight percentage, and wherein, the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
The present embodiment refractory heat-insulating spray material preparation method and application method is identical with embodiment mono-.
From table 3, table 4, refractory heat-insulating spray material sealed porosity rate of the present invention is high, be evenly distributed, and heat-proof quality is good, and mechanical strength is high, and anti-airflow scouring ability is strong.
The thermal conductivity that table 3 the present embodiment refractory heat-insulating spray material flat band method is measured
Temperature (℃) 100 300 600 900
Thermal conductivity (w/mK) 0.107 0.177 0.306 0.381
Table 4 the present embodiment refractory heat-insulating spray material physical detection result
Embodiment 3
A kind of refractory heat-insulating spray material, it comprises prefabricated slurry and solidifying agent two portions, described prefabricated slurry is formed by refractory aggregate and binder making, and the per-cent of described each component in refractory heat-insulating spray material gross weight is: 63% refractory aggregate, 34% binding agent, 3% solidifying agent; Wherein, described refractory aggregate is by weight percentage by 57% alumina hollow ball, 6% kyanite, 20% high-alumina powder clinker, 4% silicon powder, 5% α-Al
2o
3micro mist, 3%Cr
2o
3micro mist, 5% polycrystalline alumina fiber composition.
Described binding agent is made up of 59.7% phosphate dihydrogen aluminum solution, 40% water, 0.15%FS20 water reducer, 0.15% chromic trioxide by weight percentage, and wherein, the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
The present embodiment refractory heat-insulating spray material preparation method and application method is identical with embodiment mono-.
From table 5, table 6, refractory heat-insulating spray material sealed porosity rate of the present invention is high, be evenly distributed, and heat-proof quality is good, and mechanical strength is high, and anti-airflow scouring ability is strong.Refractory heat-insulating spray material of the present invention is sprayed on after heater for rolling steel furnace lining inwall, to in use carry out pyroreaction with the irony oxide compound of absorption, produce the good chromohercynite of infrared radiation property, thereby improve the radiative transfer in stove, in order further to explore the improve effect of refractory heat-insulating spray material of the present invention to inwall radiance in heater for rolling steel use procedure, the red iron oxide fine suspensions that special employing concentration is 3% carries out external coating to the present embodiment refractory heat-insulating spray material sample, and carry out the thermal treatment of 1550 ℃ × 3h, after this, adopt the surperficial spectral emittance curve of the sample of SEM-1 infra-red material emittance device measuring, test result as shown in Figure 2, as seen from the figure, the infrared normal emittance of 4～20 μ m is 0.87, reach the Temperature Infra red Radiation Coatings standard-required of YB/T134-1998, thereby, refractory heat-insulating spray material of the present invention not only has good heat-proof quality, reduce furnace wall heat lost by radiation, also can obviously improve furnace lining inner wall surface radiation characteristic simultaneously, radiative transfer in strengthening heater for rolling steel stove, improve thermal efficiency of heating furnace.
The thermal conductivity that table 5 the present embodiment refractory heat-insulating spray material flat band method is measured
Temperature (℃) 100 300 600 900
Thermal conductivity (w/mK) 0.071 0.145 0.273 0.310
Table 6 the present embodiment refractory heat-insulating spray material physical detection result
Embodiment 4
A kind of refractory heat-insulating spray material, it comprises prefabricated slurry and solidifying agent two portions, described prefabricated slurry is formed by refractory aggregate and binder making, and the per-cent of described each component in refractory heat-insulating spray material gross weight is: 60% refractory aggregate, 37% binding agent, 3% solidifying agent; Wherein, described refractory aggregate is by weight percentage by 54% alumina hollow ball, 9% kyanite, 20% high-alumina powder clinker, 4% silicon powder, 5% α-Al
2o
3micro mist, 3%Cr
2o
3micro mist, 5% polycrystalline alumina fiber composition.
Described binding agent is made up of 70% phosphate dihydrogen aluminum solution, 29.8% water, 0.1%FS20 water reducer, 0.1% chromic trioxide by weight percentage, and wherein, the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
The present embodiment refractory heat-insulating spray material preparation method and application method is identical with embodiment mono-.
Embodiment 5
A kind of refractory heat-insulating spray material, it comprises prefabricated slurry and solidifying agent two portions, described prefabricated slurry is formed by refractory aggregate and binder making, and the per-cent of described each component in refractory heat-insulating spray material gross weight is: 60% refractory aggregate, 35% binding agent, 5% solidifying agent; Wherein, described refractory aggregate is by weight percentage by 54% alumina hollow ball, 6% kyanite, 20% high-alumina powder clinker, 7% silicon powder, 5% α-Al
2o
3micro mist, 3%Cr
2o
3micro mist, 5% polycrystalline alumina fiber composition.
Described binding agent is made up of 71.85% phosphate dihydrogen aluminum solution, 28% water, 0.1%FS20 water reducer, 0.05% chromic trioxide by weight percentage, and wherein, the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
The present embodiment refractory heat-insulating spray material preparation method and application method is identical with embodiment mono-.
Embodiment 6
A kind of refractory heat-insulating spray material, it comprises prefabricated slurry and solidifying agent two portions, described prefabricated slurry is formed by refractory aggregate and binder making, and the per-cent of described each component in refractory heat-insulating spray material gross weight is: 60% refractory aggregate, 37% binding agent, 3% solidifying agent; Wherein, described refractory aggregate is by weight percentage by 54% alumina hollow ball, 6% kyanite, 20% high-alumina powder clinker, 4% silicon powder, 8% α-Al
2o
3micro mist, 3%Cr
2o
3micro mist, 5% polycrystalline alumina fiber composition.
Described binding agent is made up of 65% phosphate dihydrogen aluminum solution, 34.83% water, 0.09%FS20 water reducer, 0.08% chromic trioxide by weight percentage, and wherein, the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
The present embodiment refractory heat-insulating spray material preparation method and application method is identical with embodiment mono-.
Embodiment 7
A kind of refractory heat-insulating spray material, it comprises prefabricated slurry and solidifying agent two portions, described prefabricated slurry is formed by refractory aggregate and binder making, and the per-cent of described each component in refractory heat-insulating spray material gross weight is: 62% refractory aggregate, 35% binding agent, 3% solidifying agent; Wherein, described refractory aggregate is by weight percentage by 54% alumina hollow ball, 6% kyanite, 21% high-alumina powder clinker, 4% silicon powder, 5% α-Al
2o
3micro mist, 5%Cr
2o
3micro mist, 5% polycrystalline alumina fiber composition.
Described binding agent is made up of 76.76% phosphate dihydrogen aluminum solution, 23% water, 0.12%FS20 water reducer, 0.12% chromic trioxide by weight percentage, and wherein, the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
The present embodiment refractory heat-insulating spray material preparation method and application method is identical with embodiment mono-.
Embodiment 8
A kind of refractory heat-insulating spray material, it comprises prefabricated slurry and solidifying agent two portions, described prefabricated slurry is formed by refractory aggregate and binder making, and the per-cent of described each component in refractory heat-insulating spray material gross weight is: 62% refractory aggregate, 35% binding agent, 3% solidifying agent; Wherein, described refractory aggregate is by weight percentage by 54% alumina hollow ball, 6% kyanite, 20% high-alumina powder clinker, 5% silicon powder, 5% α-Al
2o
3micro mist, 3%Cr
2o
3micro mist, 7% polycrystalline alumina fiber composition.
Described binding agent is made up of 68.3% phosphate dihydrogen aluminum solution, 31.4% water, 0.15%FS20 water reducer, 0.15% chromic trioxide by weight percentage, and wherein, the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
The present embodiment refractory heat-insulating spray material preparation method and application method is identical with embodiment mono-.
Embodiment 9
A kind of refractory heat-insulating spray material, it comprises prefabricated slurry and solidifying agent two portions, described prefabricated slurry is formed by refractory aggregate and binder making, and the per-cent of described each component in refractory heat-insulating spray material gross weight is: 60% refractory aggregate, 36% binding agent, 4% solidifying agent; Wherein, described refractory aggregate is by weight percentage by 56% alumina hollow ball, 6% kyanite, 20% high-alumina powder clinker, 4% silicon powder, 5% α-Al
2o
3micro mist, 3%Cr
2o
3micro mist, 6% polycrystalline alumina fiber composition.
Described binding agent is made up of 72.5% phosphate dihydrogen aluminum solution, 27.4% water, 0.05%FS20 water reducer, 0.05% chromic trioxide by weight percentage, and wherein, the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
The present embodiment refractory heat-insulating spray material preparation method and application method is identical with embodiment mono-.
Embodiment 10
A kind of refractory heat-insulating spray material, it comprises prefabricated slurry and solidifying agent two portions, described prefabricated slurry is formed by refractory aggregate and binder making, and the per-cent of described each component in refractory heat-insulating spray material gross weight is: 61% refractory aggregate, 36% binding agent, 3% solidifying agent; Wherein, described refractory aggregate is by weight percentage by 54% alumina hollow ball, 6% kyanite, 20% high-alumina powder clinker, 4% silicon powder 5% α-Al
2o
3micro mist, 3%Cr
2o
3micro mist, 8% polycrystalline alumina fiber composition.
Described binding agent is made up of 63.2% phosphate dihydrogen aluminum solution, 36.66% water, 0.06%FS20 water reducer, 0.08% chromic trioxide by weight percentage, and wherein, the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
The present embodiment refractory heat-insulating spray material preparation method and application method is identical with embodiment mono-.
Embodiment 11
A kind of refractory heat-insulating spray material, it comprises prefabricated slurry and solidifying agent two portions, described prefabricated slurry is formed by refractory aggregate and binder making, and the per-cent of described each component in refractory heat-insulating spray material gross weight is: 60% refractory aggregate, 37% binding agent, 3% solidifying agent; Wherein, described refractory aggregate is by weight percentage by 54% alumina hollow ball, 6% kyanite, 20% high-alumina powder clinker, 6% silicon powder, 6% α-Al
2o
3micro mist, 3%Cr
2o
3micro mist, 5% polycrystalline alumina fiber composition.
Described binding agent is made up of 65% phosphate dihydrogen aluminum solution, 34.78% water, 0.1%FS20 water reducer, 0.12% chromic trioxide by weight percentage, and wherein, the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
The present embodiment refractory heat-insulating spray material preparation method and application method is identical with embodiment mono-.
Embodiment 12
A kind of refractory heat-insulating spray material, it comprises prefabricated slurry and solidifying agent two portions, described prefabricated slurry is formed by refractory aggregate and binder making, and the per-cent of described each component in refractory heat-insulating spray material gross weight is: 62% refractory aggregate, 35% binding agent, 3% solidifying agent; Wherein, described refractory aggregate is by weight percentage by 54% alumina hollow ball, 6% kyanite, 20% high-alumina powder clinker, 4% silicon powder, 5% α-Al
2o
3micro mist, 6%Cr
2o
3micro mist, 5% polycrystalline alumina fiber composition.
Described binding agent is made up of 62.5% phosphate dihydrogen aluminum solution, 37.2% water, 0.15%FS20 water reducer, 0.15% chromic trioxide by weight percentage, and wherein, the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
The present embodiment refractory heat-insulating spray material preparation method and application method is identical with embodiment mono-.
Claims (9)
1. a refractory heat-insulating spray material, it is characterized in that: it comprises prefabricated slurry and solidifying agent two portions, described prefabricated slurry is formed by refractory aggregate and binder making, and the per-cent of described each component in refractory heat-insulating spray material gross weight is: 60～63% refractory aggregates, 34～37% binding agents, 3～6% solidifying agent; Wherein, described refractory aggregate is by weight percentage again by 54～57% alumina hollow balls, 6～9% kyanites, 20～23% high-alumina powder clinkers, 4～7% silicon powders, 5～8% α-Al
2o
3micro mist, 3～6%Cr
2o
3micro mist, 5～8% polycrystalline alumina fiber compositions.
2. refractory heat-insulating spray material according to claim 1, it is characterized in that: described alumina hollow ball granularity is 1～0.1mm, kyanite granularity is 80～100 orders, and high alumina Powder Particle Size is 180～250 orders, polycrystalline alumina fiber length≤8mm, silicon powder granularity d
50≤ 5 μ m, α-Al
2o
3micro mist granularity d
50≤ 10 μ m, Cr
2o
3micro mist granularity d
50≤ 15 μ m.
3. refractory heat-insulating spray material according to claim 1 and 2, is characterized in that: Al in described high-alumina powder clinker
2o
3content is greater than 85%.
4. refractory heat-insulating spray material according to claim 1 and 2, it is characterized in that: described binding agent is made up of 59.7～80% phosphate dihydrogen aluminum solutions, 19.7～40% water, 0.05～015%FS20 water reducer, 0.05～015% chromic trioxide by weight percentage, wherein the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
5. refractory heat-insulating spray material according to claim 1 and 2, is characterized in that: described solidifying agent is aluminous cement.
6. a preparation method for refractory heat-insulating spray material described in claim 1, comprises the following steps:
1) by described refractory aggregate weight percent meter, take 54～57% alumina hollow balls, 6～9% kyanites, 20～23% high-alumina powder clinkers, 4～7% silicon powders, 5～8% α-Al
2o
3micro mist, 3～6%Cr
2o
3micro mist, 5～8% polycrystalline alumina fibers, be placed in stirrer and be uniformly mixed, and wherein, polycrystalline alumina fiber is to adopt mesh screen to sieve while stirring the mode adding to add in stirrer, until stir, preserves stand-by;
2) ratio in refractory heat-insulating spray material gross weight in each component, takes 60～63% refractory aggregates, 34～37% binding agents, 3～6% solidifying agent for subsequent use;
3) binding agent is added to stirred pot, then add refractory aggregate while stirring, until stir, obtain prefabricated slurry, pack container sealing into for subsequent use;
4) solidifying agent is packed in reservoir and sealed, and preserve together with prefabricated slurry, when use, solidifying agent is mixed with prefabricated slurry, can obtain refractory heat-insulating spray material.
7. the preparation method of refractory heat-insulating spray material according to claim 6, it is characterized in that: described step 2) in, binding agent is made up of 74.8% phosphate dihydrogen aluminum solution, 25% water, 0.1%FS20 water reducer, 0.1% chromic trioxide by weight percentage, and wherein the weight percent concentration of phosphate dihydrogen aluminum solution is 48%.
8. according to the preparation method of refractory heat-insulating spray material described in claim 6 or 7, it is characterized in that: in described step 3), solidifying agent adopts aluminous cement.
9. an application method for refractory heat-insulating spray material described in claim 1, comprises the following steps:
1) construction furnace lining surface treatment: adopt steel brush, the low bulk dross thing of perching knife cleaning cohesive strength, then purge surperficial floating dust with pressurized air;
2) the on-the-spot preparation of spray material: solidifying agent is poured in prefabricated slurry, stirred, obtain refractory heat-insulating spray material;
3) spraying application: adopt the wide aperture spray gun of spray coarse sand, in time the refractory heat-insulating spray material stirring is sprayed on to furnace lining inner wall surface, solidify coating thickness 5～50mm with long-time placement of slurry-free;
4) solidify: under normal temperature atmospheric condition, solidify voluntarily 0.5～2h;
5) production and application: can directly put into production after solidifying.
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| CN103466572B (en) * | 2013-08-29 | 2014-12-24 | 昆明会丰工贸有限责任公司 | Roof spraying construction technology of small yellow phosphorus flat-roof furnace lid and formulae |
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| CN106699211A (en) * | 2016-12-28 | 2017-05-24 | 马鞍山蓝科再制造技术有限公司 | Hot spray coating capable of enhancing strength of automotive cover mould |
| CN107309390A (en) * | 2017-08-21 | 2017-11-03 | 安徽省含山县兴建铸造厂 | A kind of alcohol-base foundry coating |
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| CN112299862B (en) * | 2019-07-26 | 2022-03-25 | 航天特种材料及工艺技术研究所 | Thermal protection coating on surface of porous thermal insulation material and preparation method thereof |
| CN111269017B (en) * | 2020-03-02 | 2021-12-21 | 宜兴市海科耐火材料制品有限公司 | Special high-temperature-resistant anti-corrosion lining material for hazardous waste gas melting furnace and preparation method thereof |
| CN111548701A (en) * | 2020-04-30 | 2020-08-18 | 天津大学 | Coating capable of reducing heat dissipation of surface of thermal equipment and preparation method thereof |
| CN112194453B (en) * | 2020-10-14 | 2022-07-29 | 郑州东方炉衬材料有限公司 | Light-gathering heat-insulating plastic concrete for gasification furnace and power station boiler and production process thereof |
| CN112378252A (en) * | 2020-11-10 | 2021-02-19 | 山东鲁阳节能材料股份有限公司 | Construction method for fiber furnace lining surface of ethylene cracking furnace |
| CN112280343B (en) * | 2020-11-10 | 2022-07-19 | 山东鲁阳节能材料股份有限公司 | High-temperature nano composite coating, preparation method thereof and small-bag flexible package coating |
| CN114561112B (en) * | 2022-02-25 | 2022-12-30 | 淄博市产品质量检验研究院 | Moisture-proof refractory fiber spray coating and spray coating method thereof |
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| US4656146A (en) * | 1985-06-24 | 1987-04-07 | Exxon Research & Eng. Co. | Abrasion resistant refractory composition |
| CA1274859A (en) * | 1987-06-26 | 1990-10-02 | Alcan International Limited | Insulating lightweight refractory materials |
| JP3868186B2 (en) * | 2000-05-23 | 2007-01-17 | 品川白煉瓦株式会社 | Insulating coating material for refractories containing carbon |
| CN102001860B (en) * | 2010-12-28 | 2012-12-19 | 河南科技大学 | Low-carbon aluminous-carbon refractory material for continuous casting and preparation method thereof |
| CN102351522A (en) * | 2011-07-15 | 2012-02-15 | 郑州大学 | Method for preparing homogeneous mullite material from kyanite |
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