Method for preparing slag cotton from secondary aluminum ash and fly ash

Abstract

The present application belongs to the technical field of slag wool, and particularly relates to a method for preparing slag wool from secondary aluminum ash and fly ash resources. The present application directly uses hot molten slag to prepare slag wool, realizes the recovery and utilization of the sensible heat of the hot molten slag, reduces the instability of the melt caused by the carbon dioxide generated by the introduction of carbonates, and improves the quality of the slag wool fiber prepared by the injection process. By using fly ash and secondary aluminum ash for partial conditioning, the fly ash and secondary aluminum ash contain high alumina and silica contents, can replace part of the substances for conditioning, and reduce the production cost. By adding kaempferol instead of part of the phenol, the degree of polycondensation reaction of phenol and aldehyde is slowed down, the resin gel time is shortened, and the free phenol content is reduced. As a coupling agent, boric acid has good bonding performance, high-temperature resistance, can reduce the water absorption of slag wool, improve the service life of slag wool, and the prepared slag wool product has excellent thermal insulation and hydrophobic properties.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of slag wool, and particularly relates to a method for preparing slag wool by recycling secondary aluminum ash and fly ash. BACKGROUND

[0002] Slag wool is a kind of inorganic fiber with a cotton-like shape, which is made of industrial waste slag (such as blast furnace slag, copper slag, aluminum slag, etc.) as the main raw material through melting and high-speed centrifugation or injection process. The slag wool has the characteristics of light weight, small thermal conductivity and good sound absorption performance, and is widely used in building insulation filling, cold storage cold preservation, industrial equipment heat insulation and acoustic engineering fields. The blast furnace slag has high alkalinity, small viscosity and easy crystallization, and thus cannot be directly used for producing slag wool. Therefore, a modifier rich in aluminum oxide and silicon dioxide needs to be added to improve the viscosity and surface tension of the melt and other physical and chemical properties, so as to meet the requirements of producing slag wool.

[0003] The Chinese invention patent with the publication number CN118344012A discloses a method for preparing thermal insulation cotton by using fly ash, aluminum ash and high-temperature melting, and a product thereof, which comprises the following steps: S1: screening and drying treatment of fly ash and aluminum ash; S2: mixing the treated fly ash and aluminum ash according to a predetermined ratio to form a mixture A; S3: adding silica sand, calcium carbonate and a catalyst to the mixture A to form a mixture B; S4: heating and high-temperature melting treatment of the mixture B; S5: making the mixture B in a molten state into fine filaments; S6: rapidly cooling the fiber structure to form thermal insulation cotton; S7: compression strengthening treatment of the formed thermal insulation cotton; and S8: finally, low-temperature drying of the compression strengthened thermal insulation cotton. Through efficient conversion of industrial waste into high-performance thermal insulation cotton, the maximization of resource utilization, the optimization of thermal insulation and mechanical properties, and the significant reduction of production cost and energy consumption are realized. However, the prior art has the technical problem that the production process of slag wool is not improved to improve the service life and hydrophobicity of slag wool. SUMMARY

[0004] The purpose of the present application is to provide a method for preparing slag wool by recycling secondary aluminum ash and fly ash, which solves the technical problem in the prior art that the production process of slag wool is not improved to improve the service life and hydrophobicity of slag wool.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A method for preparing slag wool by recycling secondary aluminum ash and fly ash, comprising the following steps:

[0007] S1, after washing fly ash and secondary aluminum ash, drying at 120-150℃, grinding through 200 mesh screen, placing fly ash into resistance furnace, heating to 900-1000℃, fly ash no longer produces carbon dioxide after cooling, ready for use;

[0008] S2, judging chemical composition of hot melt slag at 1100-1300℃ by spectrum analyzer, calculating mass proportion of each component of hot melt slag, weighing fly ash, secondary aluminum ash and borymagnesite according to calculation results, mixing, spraying powder into hot melt slag, heating crucible to 1550-1650℃ for conditioning for 30-50min, holding for 10-20min to obtain homogeneous melt;

[0009] S3, after detecting that viscosity of homogeneous melt is qualified, pouring homogeneous melt into flow channel, spraying high-speed airflow by nozzle to produce slag wool fibers, stopping spraying when homogeneous melt cools to 1450-1500℃, re-heating to 1550-1650℃, spraying again until homogeneous melt is used up;

[0010] S4, collecting slag wool fibers produced by spraying by cotton collector, spraying water-repellent binder by atomizing nozzle during cotton collecting, laying fibers into uniform fiber felt by cotton collector belt;

[0011] S5, sending fiber felt into curing furnace, heating at 120-150℃ for 0.5-2h to cure and form, cutting edges to obtain slag wool product.

[0012] As preferred, chemical composition of hot melt slag in S2 is as follows:

[0013]

[0014]

[0015] As preferred, acidity of homogeneous melt in S2 is controlled to be 1.1-1.3, and magnesium-aluminum ratio is 0.3-0.6.

[0016] As preferred, calculation formula of acidity is as follows:

[0017]

[0018] M k is acidity;

[0019] m(SiO2+Al2O3) is the sum of mass of silicon dioxide and aluminum oxide, unit: kg;

[0020] m(MgO+CaO) is the sum of mass of magnesium oxide and calcium oxide, unit: kg.

[0021] Preferably, the powder injection speed in S2 is 50-150 kg / min, and the injection gas is either nitrogen or compressed air.

[0022] Preferably, the viscosity of the homogeneous melt in S3 is 1-3 Pa·s.

[0023] Preferably, the blowing height in S3 is 0.8-1.1 m, and the blowing high-speed airflow speed is 200-230 m / s.

[0024] Preferably, the diameter of the slag wool fiber in S3 is 2-5 µm, and the slag ball content is 5-10 wt%.

[0025] Preferably, the relative humidity during the cotton collection in S4 is 50-70%.

[0026] Preferably, the preparation method of the hydrophobic binder comprises the following steps:

[0027] S11. Phenol and kaempferol are added to a reaction kettle, and the temperature is raised to 50-60°C. After the phenol is melted, boric acid is added at 85-95°C for 1-2 h, and then formaldehyde and sodium hydroxide are added, and the temperature is raised to 70-80°C for 1-2 h to obtain a prepolymer;

[0028] S12. Methylphenyldimethoxysilane is added to the prepolymer, and the temperature is raised to 95-100°C for 2-3 h to obtain a heat-resistant phenolic resin by dehydration under reduced pressure;

[0029] S13. The heat-resistant phenolic resin is diluted with ethanol to obtain a hydrophobic binder.

[0030] Preferably, the molar ratio of phenol, kaempferol, boric acid, and formaldehyde in S11 is 2-3:0.5-1:1:1.5-3,

[0031] Preferably, the amount of sodium hydroxide added in S11 is 1-3% of the mass of the phenol.

[0032] Preferably, the amount of methylphenyldimethoxysilane added in S12 is 10-15 wt% of the mass of the phenol.

[0033] Preferably, the amount of ethanol added in S13 is 30-40 wt% of the mass of the heat-resistant phenolic resin.

[0034] In summary, due to the adoption of the above technical solutions, the present application has the following advantages:

[0035] 1. The application directly utilizes hot molten slag to prepare slag wool, realizes the recovery and utilization of the sensible heat of hot molten slag, reduces the phenomenon of instability of the melt caused by the introduced carbon dioxide, and improves the quality of the slag wool fiber prepared by the injection process; the fly ash and secondary aluminum ash are partially tempered, the fly ash and secondary aluminum ash contain high alumina and silica content, can replace part of the material tempering, and reduce the production cost.

[0036] 2. The application adds phellojugol instead of part of phenol, slows down the condensation reaction degree of phenol and aldehyde, shortens the resin gel time, and reduces the free phenol content; the prepared hydrophobic adhesive has good bonding performance, high temperature resistance, can reduce the water absorption of the slag wool, and improves the service life of the slag wool.

[0037] 3. The application adds fly ash, secondary aluminum ash and boryl magnesium stone into hot molten slag, sprays to prepare slag wool fiber, sprays the boro-silicon modified hydrophobic adhesive for bonding and curing, and the prepared slag wool product has excellent heat preservation and hydrophobic performance. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0039] The composition of the secondary aluminum ash used in the embodiments of the application is as follows:

[0040] Composition (%) Al2O3 Al AlN SiO2 Fe n O m ]]> CaO MgO Other impurities Secondary aluminum dross 59.1 11.3 9.6 10.4 2.5 1.4 1.1 4.6

[0041] The composition of the fly ash used in the embodiments of the application is as follows:

[0042] Composition (%) Al2O3 SiO2 CaO MgO Other impurities Fly ash 51.3 40.7 3.6 1.4 3.0

[0043] The composition of the boryl magnesium stone used in the embodiments of the application is as follows:

[0044] Composition (%) B2O3 MgO CaO SiO2 Fe n O m ]]> Other impurities Boracite 40.6 45.7 1.2 5.4 2.2 4.9

[0045] Embodiment 1, a method for preparing slag wool by resource utilization of secondary aluminum ash and fly ash, comprising the following steps:

[0046] S1, after washing the fly ash and secondary aluminum ash, drying at 150 DEG C, grinding through a 200 mesh sieve, putting the fly ash into an electric resistance furnace, heating to 1000 DEG C, cooling after the fly ash no longer produces carbon dioxide, and reserving;

[0047] S2, judging the chemical composition of the hot molten slag at 1300 DEG C by the spectrum analyzer, calculating the mass required for each component ratio of 10 kg of hot molten slag, weighing 500 g of fly ash, 470 g of secondary aluminum ash and 40 g of borymage, mixing, spraying the powder into 10 kg of hot molten slag at a speed of 80 kg / min with nitrogen, heating the crucible to 1600 DEG C for 50 min, and keeping warm for 20 min to obtain a homogeneous melt;

[0048] S3, detecting that the viscosity of the homogeneous melt is 1.6 Pa·s, pouring the homogeneous melt into a drainage groove, and spraying high-speed airflow to produce slag wool fibers by a spray head, the spraying height is 1 m, the flow rate of the high-speed airflow is 210 m / s, and slag wool fibers are prepared, the homogeneous melt is cooled to 1500 DEG C to stop spraying, and is heated to 1600 DEG C again, and is sprayed again until the homogeneous melt is used up;

[0049] S4, collecting the slag wool fibers produced by spraying through a cotton collecting machine, the relative humidity in the cotton collecting process is 50%, spraying a hydrophobic binder through an atomizing spray head, and laying the fibers into a uniform fiber felt through a cotton collecting belt;

[0050] S5, sending the fiber felt into a curing furnace, heating at 130 DEG C for 1 h to cure and form, and cutting edges to prepare slag wool products.

[0051] The preparation method of the hydrophobic binder of the embodiment comprises the following steps:

[0052] S11, adding 160 g of phenol and 143 g of kaempferol into a reaction kettle, heating to 50 DEG C, after the phenol is melted, adding 61 g of boric acid to react at 90 DEG C for 1 h, then adding 60 g of formaldehyde and 4 g of sodium hydroxide, heating to 70-80 DEG C for 1-2 h to obtain a prepolymer;

[0053] S12, adding 20 g of methylphenyldimethoxysilane into the prepolymer, heating to 100 DEG C for 2 h, and dehydrating under reduced pressure to obtain a heat-resistant phenolic resin;

[0054] S13, diluting 200 g of the heat-resistant phenolic resin with 60 g of ethanol to prepare the hydrophobic binder.

[0055] Embodiment 2, a method for preparing slag wool from secondary aluminum ash and fly ash resources, comprising the following steps:

[0056] S1, after washing the fly ash and the secondary aluminum ash, drying at 150 DEG C, grinding through a 250 mesh sieve, putting the fly ash into an electric resistance furnace, heating to 950 DEG C, and cooling after the fly ash no longer produces carbon dioxide for standby;

[0057] S2, judging the chemical composition of the hot molten slag at 1200 DEG C by a spectrum analyzer, calculating the mass required for each component ratio of 10 kg of hot molten slag, weighing 200 g of fly ash, 900 g of secondary aluminum ash and 280 g of borymage and mixing, spraying the powder into 10 kg of hot molten slag at a speed of 60 kg / min by compressed air, heating the crucible to 1550 DEG C and conditioning for 30 min, and keeping warm for 10 min to obtain a homogeneous melt;

[0058] S3, detecting that the viscosity of the homogeneous melt is 2.4 Pa s, pouring the homogeneous melt into a drainage groove, and spraying high-speed airflow by a nozzle to produce slag wool fibers, the spraying height is 0.8 m, the flow rate of the high-speed airflow is 220 m / s, and the slag wool fibers are prepared, the homogeneous melt is cooled to 1450 DEG C to stop spraying, reheated to 1550 DEG C, and sprayed again until the homogeneous melt is used up;

[0059] S4, collecting the slag wool fibers produced by spraying through a cotton collector, the relative humidity of the air in the cotton collecting process is 60%, spraying a hydrophobic binder through an atomizing nozzle, and laying the fibers into a uniform fiber felt through a cotton collecting belt;

[0060] S5, sending the fiber felt into a curing furnace, heating at 120 DEG C for 2 h to cure and form, and cutting edges to obtain slag wool products.

[0061] The preparation method of the hydrophobic binder of the embodiment comprises the following steps:

[0062] S11, adding 190 g of phenol and 215 g of kaempferol into a reaction kettle, heating to 60 DEG C, after the phenol is melted, adding 61 g of boric acid to react at 85 DEG C for 2 h, then adding 45 g of formaldehyde and 2 g of sodium hydroxide, heating to 70-80 DEG C and reacting for 1-2 h to obtain a prepolymer;

[0063] S12, adding 25 g of methylphenyldimethoxysilane into the prepolymer, heating to 95 DEG C and reacting for 3 h, and dehydrating under reduced pressure to obtain a heat-resistant phenolic resin;

[0064] S13, diluting 200 g of the heat-resistant phenolic resin with 70 g of ethanol to obtain the hydrophobic binder.

[0065] Embodiment 3, a method for preparing slag wool from secondary aluminum ash and fly ash resources, comprising the following steps:

[0066] S1, after washing the fly ash and the secondary aluminum ash, drying at 140 DEG C, grinding through a 200 mesh sieve, putting the fly ash into an electric resistance furnace, heating to 1000 DEG C, and cooling after the fly ash no longer produces carbon dioxide for standby;

[0067] S2, judging the chemical composition of the hot molten slag at 1250 DEG C by a spectrum analyzer, calculating the mass required for each component ratio of 10 kg of hot molten slag, weighing 300 g of fly ash, 800 g of secondary aluminum ash and 190 g of borymage and mixing, spraying the powder into 10 kg of hot molten slag at a speed of 100 kg / min with nitrogen, heating the crucible to 1650 DEG C for 40 min, and keeping warm for 20 min to obtain a homogeneous melt;

[0068] S3, detecting that the viscosity of the homogeneous melt is 1.3 Pa·s, pouring the homogeneous melt into a drainage groove, and spraying high-speed airflow to produce slag wool fibers by a spray head, the spraying height is 1.1 m, the flow rate of the high-speed airflow is 230 m / s, and the slag wool fibers are prepared, the homogeneous melt is cooled to 1550 DEG C to stop spraying, and is heated to 1650 DEG C again, and is sprayed again until the homogeneous melt is used up;

[0069] S4, collecting the slag wool fibers produced by spraying through a cotton collector, the relative humidity in the cotton collecting process is 70%, spraying a hydrophobic binder through an atomizing spray head, and laying the fibers into a uniform fiber felt through a cotton collecting belt;

[0070] S5, sending the fiber felt into a curing furnace, heating at 150 DEG C for 0.5 h to cure and form, and cutting edges to prepare slag wool products.

[0071] The preparation method of the hydrophobic binder of the embodiment comprises the following steps:

[0072] S11, adding 228 g of phenol and 286 g of kaempferol into a reaction kettle, heating to 55 DEG C, after the phenol is melted, adding 61 g of boric acid to react at 95 DEG C for 2 h, then adding 90 g of formaldehyde and 5 g of sodium hydroxide, heating to 80 DEG C for 2 h to obtain a prepolymer;

[0073] S12, adding 30 g of methylphenyldimethoxysilane into the prepolymer, heating to 100 DEG C for 3 h, and dehydrating under reduced pressure to obtain a heat-resistant phenolic resin;

[0074] S13, diluting 200 g of the heat-resistant phenolic resin with 80 g of ethanol to prepare the hydrophobic binder.

[0075] Embodiment 4, a method for preparing slag wool from secondary aluminum ash and fly ash resources, comprising the following steps:

[0076] S1, after washing the fly ash and the secondary aluminum ash, drying at 150 DEG C, and grinding through a 300 mesh sieve, placing the fly ash into an electric resistance furnace, heating to 1000 DEG C, and cooling after the fly ash no longer produces carbon dioxide, for standby use;

[0077] S2, judging the chemical composition of the hot molten slag at 1300 DEG C by the spectrum analyzer, calculating the mass required for each component ratio of 10 kg of hot molten slag, weighing 400 g of fly ash, 600 g of secondary aluminum ash and 110 g of borymage and mixing, spraying the powder into 10 kg of hot molten slag at a speed of 150 kg / min with nitrogen, heating the crucible to 1600 DEG C for conditioning for 50 min, and keeping warm for 20 min to obtain a homogeneous melt;

[0078] S3, detecting that the viscosity of the homogeneous melt is 1.3 Pa·s, pouring the homogeneous melt into a drainage groove, and spraying high-speed airflow to make slag wool fibers by a spray head, the spraying height is 1.1 m, the flow rate of the high-speed airflow is 230 m / s, and the slag wool fibers are prepared, the homogeneous melt is cooled to 1550 DEG C to stop spraying, is heated to 1650 DEG C again, and is sprayed again until the homogeneous melt is used up;

[0079] S4, collecting the slag wool fibers generated by spraying through a cotton collector, the relative humidity of air in the cotton collecting process is 50%, spraying a hydrophobic binder through an atomizing spray head, and laying the fibers into a uniform fiber felt through a cotton collecting belt;

[0080] S5, sending the fiber felt into a curing furnace, heating at 150 DEG C for 1 h to be cured and formed, and cutting edges to prepare slag wool products.

[0081] The preparation method of the hydrophobic binder of the embodiment comprises the following steps:

[0082] S11, adding 228 g of phenol and 143 g of kaempferol into a reaction kettle, heating to 55 DEG C, after the phenol is melted, adding 61 g of boric acid to react at 90 DEG C for 2 h, then adding 60 g of formaldehyde and 3 g of sodium hydroxide, heating to 80 DEG C to react for 2 h, and obtaining a prepolymer;

[0083] S12, adding 25 g of methylphenyldimethoxysilane into the prepolymer, heating to 100 DEG C to react for 3 h, and dehydrating under reduced pressure to obtain a heat-resistant phenolic resin;

[0084] S13, diluting 200 g of the heat-resistant phenolic resin with 80 g of ethanol to prepare the hydrophobic binder.

[0085] Comparative Example 1, the difference between the comparative example and the embodiment 1 is that the hot molten slag is replaced by blast furnace slag.

[0086] Comparative Example 2, the difference between the comparative example and the embodiment 1 is that the relative humidity of air in the cotton collecting process is replaced by 80%.

[0087] Comparative Example 3, the difference between the comparative example and the embodiment 1 is that the hydrophobic binder is replaced by an asphalt binder.

[0088] Performance test

[0089] The average fiber diameter, ball content, thermal conductivity and thermal load shrinkage temperature of the slag wool products prepared from each example and the comparative example were measured according to GB / T 5480-2017 "Test methods of mineral wool and its products".

[0090] The test results are shown in Table 1 below:

[0091] Table 1 Performance test of slag wool

[0092]

[0093]

[0094] Heavy metal leaching test: according to HJ557-2010 "Solid waste leaching toxicity leaching method horizontal oscillation method", deionized water was used as leaching agent, 100g of slag wool product prepared from each example and the comparative example was added into 1L of deionized water, oscillated for 8h and stood for 16h, then filtered and collected the leaching liquid, and sent to the relevant institution for detection of heavy metal leaching amount.

[0095] The test results are shown in Table 2 below:

[0096] Table 2 Heavy metal leaching test of slag wool

[0097]

[0098] Hydrophobic performance test: 10g of slag wool product prepared from each example and the comparative example was taken out and recorded as m0 after drying to constant weight in an oven at 110℃, and then placed in a condition of temperature 35℃ and air relative humidity 90%, and then taken out after standing for 48h, weighed and recorded as m1, and the moisture absorption rate was calculated according to the following formula:

[0099]

[0100] The test results are shown in Table 3 below:

[0101] Table 3 Moisture absorption rate test of slag wool

[0102] No. Moisture absorption rate (%) Example 1 5.3 Example 2 5.4 Example 3 5.2 Example 4 5.5 Comparative Example 1 5.6 Comparative Example 2 8.9 Comparative Example 3 7.4

[0103] From the data in Table 1 above, the average fiber diameter of the slag wool prepared from Examples 1-4 was between 2.3-3.7μm, the ball content was between 6.19-6.38wt%, the thermal conductivity was 0.041-0.043W·m -1 ·k -1between 780 and 784 ℃, which indicates that the slag wool prepared by the present application has excellent high-temperature thermal stability and is suitable for working environments with higher temperatures. The slag wool prepared by Comparative Example 3 has a heat shrinkage temperature of only 750 ℃, which is lower than the heat shrinkage temperatures of the slag wool prepared by Examples 1-4, because the binder used in Comparative Example 3 lacks boron and silicon elements, which reduces the heat resistance and stability of the slag wool prepared by Comparative Example 3 in a high-temperature environment.

[0104] As can be seen from the data in Table 2, the heavy metal leaching concentrations of the slag wool prepared by Examples 1-4 are all less than the third groundwater quality standard specified in GB 14848-2017 “Groundwater Quality Standard”, which indicates that the slag wool prepared by the present application through the resource utilization of secondary aluminum ash and fly ash can effectively inhibit the leaching of heavy metals and has a smaller degree of environmental pollution.

[0105] As can be seen from the data in Table 3, the moisture absorption rates of the slag wool prepared by Examples 1-4 are between 5.2 and 5.5%, which indicates that the slag wool prepared by the present application has good hydrophobic properties. The relative humidity of the air during the collection of the slag wool in Comparative Example 2 is 80%, which causes the hydrophobic binder to fail to form a hydrophobic layer on the surface of the slag wool, resulting in a moisture absorption rate of 8.9% for the slag wool of Comparative Example 2, which is higher than the moisture absorption rates of the slag wool prepared by Examples 1-4.

[0106] The above description is only for the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can make equivalent replacements or changes to the technical solutions and inventive concepts of the present application within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application.

[0107] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The preferred embodiments do not describe all the details and do not limit the present application to only the specific embodiments. Obviously, many modifications and changes can be made to the present application according to the content of the present specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that the person skilled in the art can well understand and utilize the present application. The present application is limited only by the claims and their entire scope and equivalents.

Claims

1. A method for preparing slag wool through the resource utilization of secondary aluminum ash and fly ash, characterized in that, Includes the following steps: S1. After washing the fly ash and secondary aluminum ash with water, dry them at 120~150℃, grind them through a 200-mesh sieve, put the fly ash into an electric resistance furnace, heat it to 900~1000℃, and cool it after the fly ash no longer produces carbon dioxide. S2. Determine the chemical composition of the hot melt slag at 1100~1300℃ using a spectrometer, calculate the mass ratio of each component in the hot melt slag, weigh the fly ash, secondary aluminum ash and boromagnesite according to the calculation results and mix them, spray the powder into the hot melt slag, heat the crucible to 1550~1650℃ for conditioning for 30~50min, and hold for 10~20min to obtain a homogeneous melt; S3. After the viscosity of the homogeneous melt is found to be qualified, pour the homogeneous melt into the flow channel and use a nozzle to blow high-speed airflow to produce slag wool fibers. Stop blowing when the homogeneous melt cools to 1450~1500℃, reheat to 1550~1650℃, and blow again until the homogeneous melt is used up. S4. Collect the slag cotton fibers generated by the blown air through the cotton collecting machine. During the cotton collecting process, a hydrophobic binder is sprayed through the atomizing nozzle to spread the fibers into a uniform fiber felt through the cotton collecting belt. S5. The fiber felt is fed into a curing oven and heated at 120~150℃ for 0.5~2 hours to cure and form. The edges are then cut to obtain the slag wool product. The method for preparing the hydrophobic adhesive includes the following steps: S11. Add phenol and kaempferol to the reactor, heat to 50-60℃, and after the phenol melts, add boric acid and react at 85-95℃ for 1-2 hours. Then add formaldehyde and sodium hydroxide, heat to 70-80℃ and react for 1-2 hours to obtain the prepolymer. S12. Add methylphenyldimethoxysilane to the prepolymer, heat to 95~100℃ and react for 2~3 hours, then dehydrate under reduced pressure to obtain heat-resistant phenolic resin. S13. Heat-resistant phenolic resin is diluted with ethanol to prepare a hydrophobic adhesive; In S11, the molar ratio of phenol, kaempferol, boric acid and formaldehyde is 2~3:0.5~1:1:1.5~3, and the amount of sodium hydroxide added is 1~3% of the mass of phenol; in S12, the amount of methylphenyldimethoxysilane added is 10~15% of the mass of phenol.

2. The method for preparing slag wool through the resource utilization of secondary aluminum ash and fly ash according to claim 1, characterized in that, The chemical composition of the hot slag in S2 is as follows: SiO2 35.4%, Al2O3 13.6%, MgO 9.7%, CaO 37.8%, MnO 0.9%, Fe n O m 0.6% and other impurities 2.0%.

3. The method for preparing slag wool through the resource utilization of secondary aluminum ash and fly ash according to claim 1, characterized in that, In S2, the homogeneous melt has a controlled acidity of 1.1~1.3, a magnesium-aluminum ratio of 0.3~0.6, a powder injection speed of 50~150 kg / min, and the injected gas is either nitrogen or compressed air.

4. The method for preparing slag wool through the resource utilization of secondary aluminum ash and fly ash according to claim 1, characterized in that, The homogeneous melt in S3 has a viscosity of 1~3 Pa·s, a blowing height of 0.8~1.1 m, a blowing high-speed airflow velocity of 200~230 m / s, a slag wool fiber diameter of 2~5 μm, and a slag ball content of 5~10 wt%.

5. The method for preparing slag wool through the resource utilization of secondary aluminum ash and fly ash according to claim 1, characterized in that, The relative humidity of the air during the cotton collection process in S4 is 50-70%.

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