Infrared radiation coating based on used iron runner castable as well as preparation method and application of infrared radiation coating

Abstract

The invention discloses an infrared radiation coating based on used iron runner castable, a preparation method of the infrared radiation coating and application of the infrared radiation coating in preparation of an infrared radiation coating. The infrared radiation coating comprises the following raw materials: a solid component and a liquid component, the solid component comprises the following components in parts by mass: 70-85 parts of iron runner castable mixed powder after pretreatment, 10-19 parts of zirconium dioxide fine powder, 2-8 parts of silica powder, 1-2.5 parts of boron-containing glass powder, 0.5-1 part of magnesium oxide fine powder and 0.5-1 part of sodium carboxymethyl cellulose; the liquid component comprises an aluminum dihydrogen phosphate solution. The preparation method of the infrared radiation coating comprises the following steps: mixing and ball-milling the solid component and the liquid component to obtain the infrared radiation coating. An infrared radiation coating prepared from the infrared radiation coating can serve for a long time in the environment with the temperature of 1000-1500 DEG C or above, has high infrared emissivity in the wave band of 1-10 microns, and can enable a high-temperature heating furnace to achieve energy conservation of 6%-11%.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-temperature infrared radiation coating, in particular to an infrared radiation coating based on used iron channel castable and a preparation method and application thereof. BACKGROUND

[0002] The thermal equipment represented by high-temperature heating furnace has the characteristics of high energy consumption and low thermal efficiency. Under the high-temperature working condition of more than 1000℃ in the heating furnace, heat transfer is dominated by radiation, and the higher the temperature, the greater the contribution of radiation heat transfer, which means that strengthening the radiation heat transfer in the internal of the furnace can effectively improve the thermal efficiency of the internal of the heating furnace. However, the furnace lining refractory material used in these heating furnaces is usually mainly aluminum-silicon refractory material, whose infrared emissivity is less than 0.5, which is not conducive to the radiation heat transfer in the internal of the furnace, and is also the direct cause of the low thermal efficiency of the high-temperature heating furnace. Based on the practical consideration, coating a high-emissivity infrared radiation coating on the surface of the traditional aluminum-silicon lining refractory material is an important technical path to improve the thermal efficiency of the heating furnace.

[0003] The patent specification with publication number CN118879105A discloses a far-infrared radiation coating with an emissivity of 0.97, which is prepared by using different particle sizes of brown corundum and silicon carbide as main raw materials, and using large particle components to form protrusions on the surface of the coating, thereby increasing the radiation area of the coating and effectively improving the heating efficiency of the hot blast furnace. According to the Boltzmann law and the Wien displacement law, the infrared radiation in the internal of the high-temperature heating furnace is mainly concentrated in the 1~10μm near and middle infrared waveband. However, the high emissivity of the patent technology does not involve the 1~10μm near and middle infrared waveband which plays a dominant role in high-temperature use, and the energy-saving effect in the heating furnace above 1000℃ is not clear.

[0004] The patent specification with publication number CN113214685A discloses an infrared radiation coating with an emissivity of 0.93 in the 1~5μm waveband, which is prepared by using CuO-doped magnesia-chromite spinel fine powder as the main radiation raw material, supplemented by siliconized expanded graphite, Guangxi white mud, elemental silicon powder, glass powder, etc., using a spraying process. The coating has a high service life and good energy-saving effect in industrial furnaces above 1000℃ and without air isolation. However, the main raw material of the coating is a chromium-containing material, which is easy to generate Cr 6+ , which seriously harms the ecological environment.

[0005] The patent specification with the publication number CN111485196A discloses that, taking hafnium oxide, niobium carbide, nickel oxide, chromium oxide, titanium boride, spinel structure chromium nickel oxide as raw materials, an infrared radiation ceramic coating with high radiation rate, good thermal stability, dense coating and high bonding strength is prepared by using non-equilibrium magnetron sputtering technology. The radiation rate of the coating is 0.90~0.93 in the range of 1000-1600℃. However, the raw materials used in the patent technology are expensive, and this process is not suitable for large-scale use of high-temperature heating furnaces.

[0006] In addition, the steel and iron metallurgical industry will generate a large amount of used refractories. Even if part of the used refractories is classified and selected for secondary or multiple utilization as raw materials for refractories, the performance of the refractory products will be affected when using these low-grade used refractories as raw materials, especially the used iron runner castables, which are partially oxidized, resulting in a significant reduction in performance. They are usually used as low-grade raw materials to prepare refractories such as taphole mix and slag runner, which have low added value. SUMMARY

[0007] The present application provides an infrared radiation coating based on used iron runner castables, as well as a preparation method and application thereof. The present application has low cost and simple process. The present application realizes high value-added utilization of used iron runner castables and used magnesia-chrome brick fine powder. The coating formed by the infrared radiation coating of the present application not only can serve in an environment above 1000~1500℃ for a long time, but also has high infrared emissivity in the 1~10 μm wave band, effectively improving the radiation heat transfer efficiency of high-temperature heating furnaces, and enabling the high-temperature heating furnaces to achieve 6%~11% energy saving.

[0008] The specific technical solutions are as follows: In a first aspect, the present application provides an infrared radiation coating based on used iron runner castables, which comprises solid components and liquid components. The solid components comprise, in terms of mass fraction: 70~85 parts of pretreated used iron runner castable mixed powder, 10~19 parts of zirconia fine powder, 2~8 parts of silicon fine powder, 1~2.5 parts of boron-containing glass powder, 0.5~1 part of magnesium oxide fine powder, 0.5~1 part of sodium carboxymethyl cellulose; The preparation method of the pretreated used iron runner castable mixed powder comprises the following steps: S1, mixing and pressing the used iron runner castable fine powder and the used magnesia-chrome brick fine powder into a blank at a mass ratio of 1.5~3:1, followed by heat preservation at 1150~1300℃ for 0.5~2 h, cooling, crushing and sieving to obtain mixed powder A; S2, uniformly dispersing the mixed powder A in deionized water to obtain a mixed powder A dispersion, adding the silica sol dropwise into the mixed powder A dispersion under stirring, uniformly mixing, and adjusting the pH to 9-10 to obtain a mixed slurry, spray drying to obtain the mixed powder for the post-use iron channel castable; The liquid component includes an aluminum dihydrogen phosphate solution.

[0009] Preferably, in step S1, the Al2O3 content in the post-use iron channel castable fine powder is ≥40%, the SiC content is ≥30%, the (flake) graphite content is ≤15%, the Fe2O3 content is ≤4%, and the Al2O3+SiC+(flake) graphite+Fe2O3 content is ≥90% by mass percentage.

[0010] Preferably, in step S1, the particle size of the post-use iron channel castable fine powder is <74 μm.

[0011] Preferably, in step S1, the MgO content in the post-use magnesite-chrome brick fine powder is ≥60%, the Cr2O3 content is ≥15%, the Fe2O3 content is ≤20%, the Al2O3 content is ≤3%, and the MgO+Cr2O3+Fe2O3+Al2O3 content is ≥88% by mass percentage.

[0012] Preferably, in step S1, the average particle size of the post-use magnesite-chrome brick fine powder is less than 44 μm.

[0013] Preferably, in step S1, the pressing pressure is 10-40 MPa.

[0014] Preferably, in step S1, the particle size of the mixed powder A is <74 μm.

[0015] Preferably, in step S2, the mass ratio of the mixed powder A to the deionized water is 1:4-7.

[0016] Preferably, in step S2, the stirring speed is 200-350 r / min.

[0017] Preferably, in step S2, the solid content of the silica sol is ≥20wt%.

[0018] Preferably, in step S2, the pH of the silica sol is 8-10.

[0019] Preferably, in step S2, the viscosity of the silica sol is 5-15 mPa·s.

[0020] In step S2, ammonia water or the like can be used to adjust the pH to 9-10.

[0021] Preferably, in step S2, the inlet air temperature of the spray drying is 180-210°C, and the feeding rate is 5-20 mL / min.

[0022] Preferably, the particle size of the pre-treatment post-iron runner castable mixed powder is <150 μm.

[0023] Preferably, the zirconium dioxide fine powder is calcium-stabilized zirconia.

[0024] Preferably, the content of ZrO2 in the zirconium dioxide fine powder is ≥90% and the content of CaO is ≤7% by mass percentage.

[0025] Preferably, the average particle size of the zirconium dioxide fine powder is <44 μm.

[0026] Preferably, the content of SiO2 in the silicon micro-powder is ≥93% by mass percentage.

[0027] Preferably, the average particle size of the silicon micro-powder is <5 μm.

[0028] Preferably, the content of B2O3 in the boron-containing glass powder is ≥8% by mass percentage.

[0029] Preferably, the average particle size of the boron-containing glass powder is <44 μm.

[0030] Preferably, the content of MgO in the magnesium oxide fine powder is ≥98% by mass percentage.

[0031] Preferably, the average particle size of the magnesium oxide fine powder is <10 μm.

[0032] Preferably, the purity of the sodium carboxymethyl cellulose is analytical pure.

[0033] Preferably, the viscosity of the sodium carboxymethyl cellulose is 950-1200 Pa·s.

[0034] Preferably, the solid content of the aluminum dihydrogen phosphate solution is ≥30wt%.

[0035] Preferably, the total mass of the pre-treatment post-iron runner castable mixed powder, the zirconium dioxide fine powder, the silicon micro-powder, the boron-containing glass powder, the magnesium oxide fine powder, and the sodium carboxymethyl cellulose in the solid component is 100 parts.

[0036] Preferably, the mass ratio of the total mass of the pre-treatment post-iron runner castable mixed powder, the zirconium dioxide fine powder, the silicon micro-powder, the boron-containing glass powder, the magnesium oxide fine powder, and the sodium carboxymethyl cellulose to the mass of the aluminum dihydrogen phosphate solution is 100:62-77.

[0037] In a second aspect, the present application provides a preparation method of the infrared radiation coating of the first aspect, comprising: mixing and ball-milling the solid component and the liquid component to obtain the infrared radiation coating.

[0038] Preferably, the ball-milling time is 0.2-0.5 h.

[0039] Preferably, the grinding ball used in the ball milling is corundum ball.

[0040] Preferably, the ball-to-material ratio of the ball milling is 2-4:1.

[0041] In a third aspect, the present application provides an application of the infrared radiation coating material in the preparation of the infrared radiation coating.

[0042] In a fourth aspect, the present application provides an infrared radiation coating prepared from coating raw materials including the infrared radiation coating material of the first aspect.

[0043] In a fifth aspect, the present application provides a preparation method of the infrared radiation coating of the fourth aspect, comprising: coating the coating raw materials including the infrared radiation coating material to the surface of the refractory material of the high-temperature heating furnace, naturally drying, and then heat treating at 1200-1500℃ to obtain the infrared radiation coating.

[0044] Preferably, the natural drying time is 5-11 h.

[0045] Preferably, the heat treatment time is 1-4 h.

[0046] Compared with the prior art, the present application has the following beneficial effects: The main components of the used iron channel castable adopted in the present application are SiC, Al2O3, Fe2O3 and flake graphite. SiC is an infrared radiation material with excellent performance, especially in the 1-6 μm band. However, as a non-oxide, it cannot serve for a long time in a high-temperature air atmosphere. In the present application, the used iron channel castable fine powder is mixed with the used magnesite-chrome brick fine powder, and then the mixture is pressed into a green body, which is then fired at 1150-1300℃ and crushed and sieved to obtain a mixed powder. The used iron channel castable contains a certain amount of flake graphite, which can create a reducing atmosphere at high temperature, preventing the oxidation of SiC under high-temperature conditions, and reducing part of Fe2O3, so that part of Fe 3+ is converted into Fe 2+ . Compared with Fe 3+ , Fe 2+ has higher infrared absorption performance in the 1-10 μm band, i.e., Fe 2+ has high infrared emissivity in the 1-10 μm band.

[0047] The main chemical components of the used magnesium-chromium brick fine powder adopted in the application are MgO, Fe2O3, Al2O3 and Cr2O3, and the used magnesium-chromium brick fine powder itself contains a certain amount of spinel, but due to the limitation of components, the infrared radiation performance is limited, and the emissivity in the 1-10 mu m wave band is still less than 0.65, so the used magnesium-chromium brick fine powder cannot be directly used as an infrared radiation material for a high-temperature heating furnace to improve the thermal efficiency. The used magnesium-chromium brick fine powder is sintered with the used iron runner castable fine powder at 1150-1300 DEG C, and the two react to produce a synergistic effect to form more complex spinel structures such as (MgFe)(CrAlFe)2O4. A large number of lattice defects exist in these complex spinel structures, which promote lattice vibration enhancement and instantaneous dipole moment change at high temperatures, and greatly improve the infrared radiation performance of the infrared radiation coating based on the used iron runner castable in the 1-10 mu m wave band.

[0048] The mixed powder A prepared in the application is coated with a silica sol, and a pre-treatment used iron runner castable mixed powder is prepared by using a spray drying process. The process can form a SiO2 protective film on the surface of the mixed powder A, greatly reducing the risk of oxidation of SiC during service, and being beneficial to improving the service life of the infrared radiation coating based on the used iron runner castable. In addition, the SiO2 protective film also inhibits the oxidation of graphite to a certain extent, so that the coating maintains a reducing atmosphere, which is beneficial to inhibiting the Cr element in the used magnesium-chromium brick fine powder from being converted into Cr 6+ , and preventing pollution to the environment.

[0049] The zirconium dioxide fine powder adopted in the application is preferably CaO-stabilized ZrO2. ZrO2 has high emissivity in the 2.5-10 mu m wave band, which is helpful to improve the overall infrared radiation performance of the coating. More importantly, ZrO2 has good temperature resistance and strong corrosion resistance, which provides a guarantee for the application of the infrared radiation coating at high temperatures.

[0050] The boron-containing glass powder and silicon powder adopted in the application can ensure that the infrared radiation coating has good bonding capacity at medium and low temperatures. After the infrared radiation coating is heated to 600 DEG C, as the temperature rises, these raw materials gradually produce liquid phase, which can effectively improve the bonding strength of the infrared radiation coating and the furnace lining material of the high-temperature heating furnace, prevent the infrared radiation coating from producing cracks and other defects, and the appropriate liquid phase formed at high temperatures also ensures that the infrared radiation coating has good thermal shock stability and service life at high temperatures.

[0051] The aluminum dihydrogen phosphate solution is used as the binder of the infrared radiation coating in the application. Firstly, the aluminum dihydrogen phosphate solution is acidic, which further reduces the Cr 6+The risk of pollution is avoided; secondly, the aluminum dihydrogen phosphate can be quickly solidified at normal temperature in the presence of MgO, so that the infrared radiation coating is prevented from being damaged during construction. Finally, the aluminum dihydrogen phosphate is gradually decomposed after exceeding 1000 DEG C, and the Al2O3 generated after decomposition reacts with SiO2 in the system, so that the coating has higher bonding strength.

[0052] The application adopts the mixed powder of post-service iron runner castable as the main infrared radiation raw material, and the raw material is from solid waste and has low price. The coating of the mixed powder can effectively inhibit the oxidation of SiC, and provides guarantee for long-term and effective radiation energy-saving effect of the infrared radiation coating. The use of two kinds of solid waste as the raw material of the infrared radiation coating provides a new way for high value-added utilization of post-service iron runner castable and post-service magnesia-chrome brick, and has remarkable economic effect and environmental protection value.

[0053] The infrared radiation coating prepared by the application is combined firmly with the lining of a high-temperature heating furnace, the average emissivity of the infrared radiation coating based on the post-service iron runner castable in the 1-10 mu m wave band is 0.91-0.98 by using a high-temperature infrared emissivity test equipment; the bonding strength of the infrared radiation coating based on the post-service iron runner castable is 7.9-11.6 MPa by using a cementing pull-off method, and the coating does not have peeling, cracking and falling-off phenomenon after being repeatedly water-cooled for 25-44 times under the condition of 1100 DEG C for 15 min. The infrared radiation coating prepared by the application can realize 6%-11% energy saving when being coated on the surface of the lining of the high-temperature heating furnace.

[0054] Therefore, the application has low cost and simple process, the infrared radiation coating based on the post-service iron runner castable has long service life in the environment of a high-temperature heating furnace above 1000 DEG C, and has high infrared emissivity in the 1-10 mu m wave band, and the radiation heat exchange capacity of the high-temperature heating furnace is effectively strengthened. DETAILED DESCRIPTION

[0055] The application will be further described below in conjunction with specific examples. It should be understood that the examples are only used to illustrate the application and not used to limit the scope of the application. The operation methods not specified in the following examples are usually carried out according to conventional conditions or according to the conditions suggested by the manufacturers.

[0056] In the following examples: The content of Al2O3 in the post-service iron runner castable fine powder is greater than or equal to 40% by mass percentage, the content of SiC is greater than or equal to 30%, the content of graphite is less than or equal to 15%, the content of Fe2O3 is less than or equal to 4%, and the content of Al2O3+SiC+graphite+Fe2O3 is greater than or equal to 90%; The particle size of the post-service iron runner castable fine powder is less than 74 mu m; The MgO content in the used magnesium-chromium brick fine powder is greater than or equal to 60% by mass percentage, the Cr2O3 content is greater than or equal to 15%, the Fe2O3 content is less than or equal to 20%, the Al2O3 content is less than or equal to 3%, and the MgO+Cr2O3+Fe2O3+Al2O3 content is greater than or equal to 88%; The average particle size of the used magnesium-chromium brick fine powder is less than 44 μm; The zirconium dioxide fine powder is calcium-stabilized zirconia; the ZrO2 content in the zirconium dioxide fine powder is greater than or equal to 90% by mass percentage, and the CaO content is less than or equal to 7%; The average particle size of the zirconium dioxide fine powder is less than 44 μm; The SiO2 content in the silicon micro-powder is greater than or equal to 93% by mass percentage; The average particle size of the silicon micro-powder is less than 5 μm; The B2O3 content in the boron-containing glass powder is greater than or equal to 8% by mass percentage; The average particle size of the boron-containing glass powder is less than 44 μm; The MgO content in the magnesium oxide fine powder is greater than or equal to 98% by mass percentage; The average particle size of the magnesium oxide fine powder is less than 10 μm; The purity of the sodium carboxymethyl cellulose is analytical pure; The viscosity of the sodium carboxymethyl cellulose is 950-1200 Pa·s; The solid content of the aluminum dihydrogen phosphate solution is greater than or equal to 30wt%.

[0057] Example 1: An infrared radiation coating based on used iron runner castable, the raw material composition includes solid components and liquid components; The solid components include, in mass parts: 70 parts of pretreated used iron runner castable mixed powder, 19 parts of zirconium dioxide fine powder, 8 parts of silicon micro-powder, 1 part of boron-containing glass powder, 1 part of magnesium oxide fine powder, 1 part of sodium carboxymethyl cellulose; The preparation method of the pretreated used iron runner castable mixed powder includes the following steps: S1, mix the used iron runner castable fine powder and the used magnesium-chromium brick fine powder according to a mass ratio of 1.5:1, press into a blank at 10 MPa, and then heat at 1150°C for 0.5 h, and naturally cool, crush and sieve to obtain mixed powder A; the particle size of the mixed powder A is less than 74 μm; S2, the mixed powder A is added into deionized water, and stirred at 200 r / min for 0.5 h by magnetic force to obtain a mixed powder A dispersion liquid, the mixed powder A dispersion liquid is added dropwise with silica sol under stirring at 200 r / min, and mixed uniformly, and the pH is adjusted to 9 by using ammonia water, and the stirring is continued for 1 h to obtain a mixed slurry, the mixed slurry is sprayed and dried by using a centrifugal spray dryer, and sieving is performed to obtain a post-treatment used iron channel castable mixed powder; the mass ratio of the mixed powder A, the deionized water and the silica sol is 1:4:0.2; the air inlet temperature of the spray dryer is 180℃, and the feeding rate is 5 mL / min, and the particle size of the post-treatment used iron channel castable mixed powder is less than 150 μm; The liquid component includes an aluminum dihydrogen phosphate solution.

[0058] The preparation method of the above-mentioned infrared radiation coating includes: using a planetary ball mill, the solid component and the liquid component are mixed and ball milled for 0.2 h, the ball milling uses corundum balls, the ball milling ball-to-material ratio is 2:1, and the infrared radiation coating is obtained; the mass ratio of the total mass of the post-treatment used iron channel castable mixed powder, zirconium dioxide fine powder, silicon powder, boron-containing glass powder, magnesium oxide fine powder and sodium carboxymethyl cellulose and the mass of the aluminum dihydrogen phosphate solution is 100:62.

[0059] The preparation method of the infrared radiation coating includes: the above-mentioned infrared radiation coating is coated on the surface of the refractory material of the high-temperature heating furnace, and after natural drying for 5 h, heat treatment is performed at 1200℃ for 4 h to obtain the infrared radiation coating.

[0060] The infrared radiation coating of the embodiment is firmly combined with the furnace lining of the high-temperature heating furnace, the average emissivity of the infrared radiation coating based on the used iron channel castable in the 1-10 μm wave band is 0.91 by using a high-temperature infrared emissivity test equipment, the bonding strength of the infrared radiation coating based on the used iron channel castable is 7.9 MPa by using a cementation pull-off method, and the coating does not produce peeling, cracking and falling phenomena after repeated water cooling for 25 times under the condition of 1100℃ for 15 min. The infrared radiation coating prepared in the embodiment is coated on the surface of the furnace lining of the high-temperature heating furnace, and 6% energy saving can be achieved.

[0061] Example 2: An infrared radiation coating based on a post-treatment used iron channel castable, the raw material composition includes a solid component and a liquid component; The solid component includes, in mass fraction: 75 parts of post-treatment used iron channel castable mixed powder, 16 parts of zirconium dioxide fine powder, 5 parts of silicon powder, 2.5 parts of boron-containing glass powder, 1 part of magnesium oxide fine powder, 0.5 parts of sodium carboxymethyl cellulose; The preparation method of the post-used iron runner castable mixed powder for pretreatment comprises the following steps: S1, mixing the post-used iron runner castable fine powder and the post-used magnesia-chrome brick fine powder according to a mass ratio of 2:1, pressing into a blank under a pressure of 20 MPa, and then heat treating at 1200 DEG C for 1 h, naturally cooling, crushing and sieving to obtain a mixed powder A, the particle size of the mixed powder A being < 74 μm; S2, adding the mixed powder A into deionized water, magnetically stirring at 250 r / min for 0.6 h to obtain a mixed powder A dispersion, adding a silica sol dropwise into the mixed powder A dispersion under stirring at 250 r / min, mixing uniformly, adjusting the pH to 9 with ammonia water, continuing to stir for 1 h to obtain a mixed slurry, and performing spray drying on the mixed slurry by using a centrifugal spray dryer, and sieving to obtain the post-used iron runner castable mixed powder for pretreatment; the mass ratio of the mixed powder A, the deionized water and the silica sol being 1:5:0.3; the inlet air temperature of the spray dryer being 190 DEG C, and the feeding rate being 10 mL / min, the particle size of the post-used iron runner castable mixed powder for pretreatment being < 150 μm; The liquid component comprises an aluminum dihydrogen phosphate solution.

[0062] The preparation method of the above-mentioned infrared radiation coating comprises: using a planetary ball mill, ball milling the solid component and the liquid component for 0.2 h, the ball milling using corundum balls, the ball milling having a ball-to-material ratio of 3:1, to obtain the infrared radiation coating; the mass ratio of the total mass of the post-used iron runner castable mixed powder for pretreatment, the zirconium dioxide fine powder, the silicon micro-powder, the boron-containing glass powder, the magnesium oxide fine powder and the sodium carboxymethyl cellulose, and the mass of the aluminum dihydrogen phosphate solution being 100:67.

[0063] The preparation method of the infrared radiation coating comprises: coating the above-mentioned infrared radiation coating to the surface of the refractory material of the high-temperature heating furnace, naturally drying for 7 h, and then heat treating at 1300 DEG C for 3 h to obtain the infrared radiation coating.

[0064] The infrared radiation coating of the present embodiment is firmly combined with the lining of the high-temperature heating furnace, the average emissivity of the infrared radiation coating based on the post-used iron runner castable in the 1-10 μm wave band is 0.93, which is tested by using a high-temperature infrared emissivity testing device; the bonding strength of the infrared radiation coating based on the post-used iron runner castable is 8.1 MPa, which is measured by a cementation pull-off method, and the coating is repeatedly heated at 1100 DEG C for 15 min and water-cooled for 33 times without peeling, cracking and falling off. Coating the infrared radiation coating prepared in the present embodiment on the surface of the lining of the high-temperature heating furnace can achieve 7% energy saving.

[0065] Example 3: An infrared radiation coating based on a post-used iron runner castable, the raw material composition comprising a solid component and a liquid component; The solid component comprises, in mass parts: Pre-treatment with the used iron channel castable mixed powder 80 parts, Zirconium dioxide fine powder 13 parts, Silicon micro powder 4 parts, Boron-containing glass powder 1.5 parts, Magnesium oxide fine powder 0.5 parts, Sodium carboxymethyl cellulose 1 part; The preparation method of the pre-treatment with the used iron channel castable mixed powder comprises the steps of: S1, mixing the used iron channel castable fine powder and the used magnesia-chrome brick fine powder according to the mass ratio of 2.5:1, pressing into a blank at 30 MPa, and then heat treating at 1250℃ for 1.5 h, naturally cooling, crushing and sieving to obtain mixed powder A; the particle size of the mixed powder A is <74 μm; S2, adding the mixed powder A into deionized water, magnetically stirring at 300 r / min for 0.8 h to obtain a mixed powder A dispersion liquid, adding silicon sol dropwise into the mixed powder A dispersion liquid under stirring at 300 r / min, mixing uniformly and adjusting the pH to 10 with ammonia water, continuing to stir for 2 h to obtain a mixed slurry, and using a centrifugal spray dryer to spray dry the mixed slurry, and sieving to obtain the pre-treatment with the used iron channel castable mixed powder; the mass ratio of the mixed powder A, the deionized water and the silicon sol is 1:6:0.4; the inlet air temperature of the spray dryer is 200℃, the feeding rate is 15 mL / min, and the particle size of the pre-treatment with the used iron channel castable mixed powder is <150 μm; The liquid component comprises an aluminum dihydrogen phosphate solution.

[0066] The preparation method of the above-mentioned infrared radiation coating comprises: using a planetary ball mill to mix and ball mill the solid component and the liquid component for 0.4 h, using corundum balls as the ball mill balls, and the ball-to-material ratio of the ball mill being 3:1, to obtain the infrared radiation coating; the mass ratio of the total mass of the pre-treatment with the used iron channel castable mixed powder, the zirconium dioxide fine powder, the silicon micro powder, the boron-containing glass powder, the magnesium oxide fine powder and the sodium carboxymethyl cellulose, and the mass of the aluminum dihydrogen phosphate solution being 100:72.

[0067] The preparation method of the infrared radiation coating comprises: coating the above-mentioned infrared radiation coating to the surface of the refractory material of a high-temperature heating furnace, naturally drying for 9 h, and then heat treating at 1400℃ for 2 h to obtain the infrared radiation coating.

[0068] The infrared radiation coating of the embodiment is firmly combined with the lining of the high-temperature heating furnace. The average emissivity of the infrared radiation coating based on the used iron channel castable in the 1-10 μm wave band is 0.98, which is tested by using the high-temperature infrared emissivity test equipment. The bonding strength of the infrared radiation coating based on the used iron channel castable is 11.6 MPa, which is measured by the cementing pull-off method, and the coating does not produce peeling, cracking and falling phenomenon after being repeatedly heated at 1100℃ for 15 min and water-cooled for 44 times. The infrared radiation coating prepared in the embodiment can realize 11% energy saving when coated on the surface of the lining of the high-temperature heating furnace.

[0069] Embodiment 4: An infrared radiation coating based on used iron channel castable, the raw material composition comprising solid components and liquid components; The solid components comprise, in mass fraction: 85 parts of pretreated used iron channel castable mixed powder, 10 parts of zirconium dioxide fine powder, 2 parts of silicon fine powder, 1 part of boron-containing glass powder, 1 part of magnesium oxide fine powder, 1 part of sodium carboxymethyl cellulose; The preparation method of the pretreated used iron channel castable mixed powder comprises the following steps: S1, mixing the used iron channel castable fine powder and the used magnesia-chrome brick fine powder according to a mass ratio of 3:1, pressing into a blank at 40 MPa, and then heat treating at 1300℃ for 2 h, and naturally cooling, crushing and sieving to obtain mixed powder A; the particle size of the mixed powder A is <74 μm; S2, adding the mixed powder A into deionized water, magnetically stirring at 350 r / min for 1 h to obtain a mixed powder A dispersion, adding silica sol dropwise into the mixed powder A dispersion under stirring at 350 r / min, mixing uniformly, and adjusting the pH to 10 with ammonia water, continuing to stir for 2 h to obtain a mixed slurry, and using a centrifugal spray dryer to spray dry the mixed slurry, and sieving to obtain the pretreated used iron channel castable mixed powder; the mass ratio of the mixed powder A, the deionized water and the silica sol is 1:7:0.5; the inlet air temperature of the spray dryer is 210℃, and the feeding rate is 20 mL / min; the particle size of the pretreated used iron channel castable mixed powder is <150 μm; The liquid components comprise an aluminum dihydrogen phosphate solution.

[0070] The preparation method of the infrared radiation coating comprises the following steps: mixing the solid components and the liquid components by using a planetary ball mill for 0.5 h, wherein the ball mill uses corundum balls, the ball-to-material ratio of the ball mill is 4:1, and the infrared radiation coating is obtained; and the total mass of the pretreated used iron channel castable mixed powder, zirconium dioxide fine powder, silicon fine powder, boron-containing glass powder, magnesium oxide fine powder and sodium carboxymethyl cellulose and the mass of the aluminum dihydrogen phosphate solution are in a mass ratio of 100:77.

[0071] The preparation method of the infrared radiation coating comprises the following steps: coating the infrared radiation coating onto the surface of the refractory material of the high-temperature heating furnace, naturally drying for 11 h, and then heat treating at 1500 DEG C for 1 h, so that the infrared radiation coating is obtained.

[0072] The infrared radiation coating of the embodiment is firmly combined with the lining of the high-temperature heating furnace, the average emissivity of the infrared radiation coating based on the used iron channel castable in the 1-10 μm wave band is 0.97, which is tested by using a high-temperature infrared emissivity testing device, the bonding strength of the infrared radiation coating based on the used iron channel castable is 10.7 MPa, which is tested by using a cementing pull-off method, and the coating does not have peeling, cracking and falling phenomena after being repeatedly water-cooled for 40 times at 1100 DEG C for 15 min. Coating the infrared radiation coating prepared in the embodiment onto the surface of the lining of the high-temperature heating furnace can achieve 9% energy saving.

[0073] In addition, it should be understood that, after reading the above description of the present application, those skilled in the art can make various modifications or changes to the present application, and these equivalent forms also fall within the scope defined by the claims of the present application.

Claims

1. An infrared radiation coating based on post-use iron runner castable, characterized in that, The raw material composition comprises a solid component and a liquid component; The solid component comprises, in mass fraction: 70-85 parts of used post-treatment iron runner castable mixed powder for pretreatment, 10-19 parts of zirconium dioxide fine powder, 2-8 parts of silicon fine powder, 1-2.5 parts of boron-containing glass powder, 0.5-1 part of magnesium oxide fine powder, 0.5-1 part of sodium carboxymethyl cellulose; The preparation method of the used post-treatment iron runner castable mixed powder for pretreatment comprises the steps of: S1. mixing and pressing the used post-treatment iron runner castable fine powder and the used post-treatment magnesia-chrome brick fine powder in a mass ratio of 1.5-3:1 into a blank, then keeping the blank at 1150-1300°C for 0.5-2 hours, cooling, crushing and sieving to obtain mixed powder A; S2. uniformly dispersing the mixed powder A in deionized water to obtain a mixed powder A dispersion, adding silicon sol dropwise into the mixed powder A dispersion under stirring, uniformly mixing and adjusting the pH to 9-10 to obtain a mixed slurry, and spray drying to obtain the used post-treatment iron runner castable mixed powder for pretreatment; the mass ratio of the mixed powder A and the silicon sol is 1:0.2-0.5; The liquid component comprises an aluminum dihydrogen phosphate solution.

2. The infrared radiation coating according to claim 1, characterized in that In step S1: In mass percentage, the Al2O3 content in the used post-treatment iron runner castable fine powder is ≥40%, the SiC content is ≥30%, the graphite content is ≤15%, the Fe2O3 content is ≤4%, and the Al2O3+SiC+graphite+Fe2O3 content is ≥90%; The particle size of the used post-treatment iron runner castable fine powder is <74 μm; In mass percentage, the MgO content in the used post-treatment magnesia-chrome brick fine powder is ≥60%, the Cr2O3 content is ≥15%, the Fe2O3 content is ≤20%, and the Al2O3 content is ≤3%, and the MgO+Cr2O3+Fe2O3+Al2O3 content is ≥88%; The average particle size of the used post-treatment magnesia-chrome brick fine powder is less than 44 μm; The pressing pressure is 10-40 MPa; The particle size of the mixed powder A is <74 μm; In step S2: The mass ratio of the mixed powder A and the deionized water is 1:4-7; The stirring speed is 200-350 r / min; The solid content of the silicon sol is ≥20wt%, the pH of the silicon sol is 8-10, and the viscosity of the silicon sol is 5-15 mPa·s; The inlet air temperature of the spray drying is 180-210°C, and the feeding rate is 5-20 mL / min.

3. The infrared radiation coating according to claim 1, characterized in that The particle size of the used post-treatment iron runner castable mixed powder for pretreatment is <150 μm; The zirconium dioxide fine powder is calcium-stabilized zirconium dioxide; in mass percentage, the ZrO2 content in the zirconium dioxide fine powder is ≥90%, and the CaO content is ≤7%; The average particle size of the zirconium dioxide fine powder is less than 44 μm; In mass percentage, the SiO2 content in the silicon fine powder is ≥93%; The average particle size of the silicon fine powder is less than 5 μm; In mass percentage, the B2O3 content in the boron-containing glass powder is ≥8%; The average particle size of the boron-containing glass powder is less than 44 μm; In mass percentage, the MgO content in the magnesium oxide fine powder is ≥98%; The average particle size of the magnesium oxide fine powder is less than 10 μm; The purity of the sodium carboxymethyl cellulose is analytical pure; The viscosity of the sodium carboxymethyl cellulose is 950-1200 Pa·s; The solid content of the aluminum dihydrogen phosphate solution is ≥30wt%.

4. The infrared radiation coating according to claim 1, characterized in that The total mass of the pretreated castable refractory mixture powder, zirconium dioxide fine powder, silica powder, boron glass powder, magnesium oxide fine powder, and sodium carboxymethyl cellulose in the solid component is 100 parts. The mass ratio of the total mass of the pretreated castable mixture powder, zirconium dioxide fine powder, silica powder, borosilicate glass powder, and magnesium oxide fine powder to the aluminum dihydrogen phosphate solution is 100:62~77.

5. Process for the production of an infrared radiation paint according to any one of claims 1 to 4, characterized in that, include: The solid and liquid components are mixed and ball-milled to obtain the infrared radiation coating.

6. The method for producing an infrared radiation coating according to claim 5, characterized in that, The ball milling time is 0.2~0.5 hours; The grinding balls used in the ball mill are corundum balls; The ball-to-material ratio in ball milling is 2-4:

1.

7. The application of the infrared radiation coating according to any one of claims 1 to 4 in the preparation of infrared radiation coatings.

8. An infrared radiation coating characterized by, It is prepared from coating raw materials including the infrared radiation coating described in any one of claims 1 to 4.

9. The method of claim 8, wherein the infrared radiation coating is prepared by a process comprising: include: The coating raw materials, including the infrared radiation coating, are coated onto the surface of the refractory material of a high-temperature heating furnace, and after natural drying, are heat-treated at 1200~1500℃ to obtain the infrared radiation coating.

10. The method of claim 9, wherein the infrared radiation coating is prepared by a process comprising: The natural drying time is 5-11 hours; The heat treatment time is 1 to 4 hours.