Method for preparing mineral wool by resource utilization of secondary aluminum ash and fly ash

Abstract

The invention belongs to the technical field of mineral cotton, and particularly relates to a method for preparing mineral cotton through resource utilization of secondary aluminum ash and coal ash. According to the method, the slag wool is prepared by directly utilizing the hot melting slag, so that sensible heat recovery and utilization of the hot melting slag are realized, the phenomenon of melt instability caused by carbon dioxide generated by introducing carbonate is reduced, and the quality of the slag wool fiber prepared by a blowing process is improved; the fly ash and the secondary aluminum ash are used for partial hardening and tempering, and the fly ash and the secondary aluminum ash contain high aluminum oxide content and high silicon dioxide content and can replace partial substance hardening and tempering, so that the production cost is reduced; kaempferol is added to replace part of phenol, so that the condensation polymerization degree of phenol and aldehyde is slowed down, the resin gelation time is shortened, and the content of free phenol is reduced; according to the preparation method, the hydrophobic binder is prepared from mineral wool as a raw material and boric acid as a coupling agent, the prepared hydrophobic binder has good bonding performance and high temperature resistance, the water absorption performance of the mineral wool can be reduced, the service life of the mineral wool is prolonged, and the prepared mineral wool product has excellent heat preservation and hydrophobic performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of slag wool, and particularly relates to a method for the resource utilization of secondary aluminum ash and fly ash to prepare slag wool. Background Art

[0002] Slag wool is made of industrial waste slag (such as blast furnace slag, copper slag, aluminum slag, etc.) as the main raw material, and is made into cotton-like inorganic fibers through melting and processes such as high-speed centrifugation or spraying. Slag wool has the characteristics of light weight, small thermal conductivity, and good sound absorption performance, and is widely used in the fields of building thermal insulation filling, cold storage insulation, industrial equipment heat insulation, and acoustic engineering. The blast furnace slag in China generally has a high alkalinity, low viscosity, and is easy to crystallize, and cannot be directly used to produce slag wool. Therefore, a conditioning agent rich in alumina and silica needs to be added to improve the physical and chemical properties such as the viscosity and surface tension of the melt to meet the requirements for producing slag wool.

[0003] The Chinese invention patent with the publication number CN118344012A discloses a method and its product for preparing thermal insulation cotton by the synergistic high-temperature melting of fly ash and aluminum ash, including the following steps: S1: screening and drying the fly ash and aluminum ash; S2: mixing the treated fly ash and aluminum ash in a predetermined ratio to form mixture A; S3: adding silica sand, calcium carbonate, and a catalyst to mixture A to form mixture B; S4: heating mixture B for high-temperature melting treatment; S5: making the molten mixture B into filaments; S6: quickly cooling the fiber structure to form thermal insulation cotton; S7: performing a compressive strengthening treatment on the formed thermal insulation cotton; S8: finally, performing low-temperature drying on the thermally insulated cotton after the compressive strengthening treatment. By efficiently converting 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 costs and energy consumption are achieved. However, the existing technology has the technical problem that the service life and hydrophobic performance of slag wool are not improved by improving the production process of slag wool. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for the resource utilization of secondary aluminum ash and fly ash to prepare slag wool, which is used to solve the technical problem in the existing technology that the service life and hydrophobic performance of slag wool are not improved by improving the production process of slag wool.

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

[0006] A method for the resource utilization of secondary aluminum ash and fly ash to prepare slag wool, including the following steps:

[0007] S1. After washing fly ash and secondary aluminum ash with water, dry them at 120 - 150 °C, grind them through a 200 - mesh sieve, put the fly ash into an electric resistance furnace, heat it up to 900 - 1000 °C, cool it after the fly ash stops generating carbon dioxide, and reserve it for use;

[0008] S2. Judge the chemical composition of the hot - molten slag at 1100 - 1300 °C through a spectral analyzer, calculate the mass ratio of each component of the hot - molten slag, weigh fly ash, secondary aluminum ash and asbestine according to the calculation results and mix them, spray the powder into the hot - molten slag, heat the crucible to 1550 - 1650 °C for tempering for 30 - 50 min, and keep it warm for 10 - 20 min to obtain a homogeneous melt;

[0009] S3. After detecting that the viscosity of the homogeneous melt is qualified, pour the homogeneous melt into a drainage trough, use a nozzle to blow high - speed air to produce slag wool fibers, stop blowing when the homogeneous melt cools to 1450 - 1500 °C, re - heat it to 1550 - 1650 °C, and blow again until the homogeneous melt is used up;

[0010] S4. Collect the slag wool fibers generated by blowing through a cotton collecting machine, spray a hydrophobic binder through an atomizing nozzle during the cotton collecting process, and spread the fibers into a uniform fiber mat through a cotton collecting belt;

[0011] S5. Send the fiber mat into a curing furnace, heat it at 120 - 150 °C for 0.5 - 2 h to cure and form, and cut the edges to obtain a slag wool product.

[0012] Preferably, the chemical composition of the hot - molten slag in S2 is as follows:

[0013]

[0014]

[0015] Preferably, the acidity of the homogeneous melt in S2 is controlled at 1.1 - 1.3, and the magnesium - aluminum ratio is 0.3 - 0.6.

[0016] Preferably, the calculation formula of the acidity is as follows:

[0017]

[0018] M k is the acidity;

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

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

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

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

[0023] Preferably, the injection height in S3 is 0.8-1.1 m, and the flow rate of the high-speed injected air current is 200-230 m / s.

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

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

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

[0027] S11. Add phenol and kaempferol into a reaction kettle, heat up to 50-60 °C. After the phenol melts, add boric acid and react at 85-95 °C for 1-2 h. Then add formaldehyde and sodium hydroxide, heat up to 70-80 °C and react for 1-2 h to obtain a prepolymer.

[0028] S12. Add methylphenyl dimethoxysilane into the prepolymer, heat up to 95-100 °C and react for 2-3 h, and dehydrate under reduced pressure to obtain a heat-resistant phenolic resin.

[0029] S13. Dilute the heat-resistant phenolic resin with ethanol to prepare the 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 addition amount of sodium hydroxide in S11 is 1-3% of the mass of phenol.

[0032] Preferably, the addition amount of methylphenyl dimethoxysilane in S12 is 10-15 wt% of the mass of phenol.

[0033] Preferably, the addition amount of ethanol 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 beneficial effects of the present invention are:

[0035] 1. The present invention directly uses hot-melt slag to prepare slag wool, realizing the sensible heat recovery and utilization of hot-melt slag, reducing the phenomenon of melt instability caused by the carbon dioxide generated by introducing carbonate, and improving the quality of slag wool fibers prepared by the blowing process; by using fly ash and secondary aluminum ash for partial conditioning, fly ash and secondary aluminum ash contain relatively high contents of alumina and silica, which can replace some substances for conditioning and reduce the production cost.

[0036] 2. The present invention adds kaempferol to replace part of phenol, slowing down the degree of polycondensation reaction between phenol and aldehyde, shortening the resin gel time and reducing the free phenol content; boric acid is used as a coupling agent, and the prepared hydrophobic binder has good bonding performance and high temperature resistance, can reduce the water absorption performance of slag wool, and improve the service life of slag wool.

[0037] 3. The present invention adds fly ash, secondary aluminum ash and ascharite into hot-melt slag, blows to prepare slag wool fibers, and then sprays and bonds and cures with a boron-silicon modified hydrophobic binder, and the prepared slag wool product has excellent heat preservation and hydrophobic properties. Detailed implementation manners

[0038] The technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

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

[0040] Composition (%) <![CDATA[Al2O3]]> Al AlN <![CDATA[SiO2]]> <![CDATA[Fe n O m > CaO MgO Other impurities Secondary aluminum ash 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 involved in the present invention is as follows:

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

[0043] The composition of the ascharite used in the embodiments involved in the present invention is as follows:

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

[0045] Example 1. A method for resource utilization of secondary aluminum ash and fly ash to prepare slag wool in this embodiment includes the following steps:

[0046] S1. After washing fly ash and secondary aluminum ash, dry them at 150 °C, grind them through a 200-mesh sieve, put the fly ash into an electric resistance furnace, heat it to 1000 °C, and cool it after the fly ash no longer generates carbon dioxide for standby;

[0047] S2. Use a spectral analyzer to determine the chemical composition of the hot-melt slag at 1300 °C, calculate the mass required for each component ratio of 10 kg of hot-melt slag, weigh 500 g of fly ash, 470 g of secondary aluminum ash and 40 g of ascharite, mix them, and spray the powder into 10 kg of hot-melt slag at a speed of 80 kg / min with nitrogen. Heat the crucible to 1600 °C for tempering for 50 min and keep it warm for 20 min to obtain a homogeneous melt;

[0048] S3. Detect that the viscosity of the homogeneous melt is 1.6 Pa·s. Pour the homogeneous melt into the drainage trough, use a nozzle to spray high-speed air flow to manufacture slag wool fibers. The spraying height is 1 m and the flow rate of the sprayed high-speed air flow is 210 m / s to obtain slag wool fibers. Stop spraying when the homogeneous melt cools to 1500 °C, reheat it to 1600 °C, and spray again until the homogeneous melt is used up;

[0049] S4. Collect the slag wool fibers generated by spraying through a cotton collecting machine. The relative humidity of the air during the cotton collecting process is 50%. Spray a hydrophobic binder through an atomizing nozzle and spread the fibers into a uniform fiber mat through a cotton collecting belt;

[0050] S5. Send the fiber mat into a curing furnace, heat it at 130 °C for 1 h for curing and forming, and cut the edges to obtain a slag wool product.

[0051] The preparation method of the hydrophobic binder in this embodiment includes the following steps:

[0052] S11. Add 160 g of phenol and 143 g of kaempferol to the reaction kettle, heat up to 50 °C. After the phenol melts, add 61 g of boric acid and react at 90 °C for 1 h, then add 60 g of formaldehyde and 4 g of sodium hydroxide, heat up to 70 - 80 °C and react for 1 - 2 h to obtain a prepolymer;

[0053] S12. Add 20 g of methylphenyl dimethoxysilane to the prepolymer, heat up to 100 °C and react for 2 h, and dehydrate under reduced pressure to obtain a heat-resistant phenolic resin;

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

[0055] Example 2. A method for recycling secondary aluminum ash and fly ash to prepare slag wool includes the following steps:

[0056] S1. After washing the fly ash and secondary aluminum ash with water, dry them at 150 °C, grind them through a 250-mesh sieve, put the fly ash into an electric resistance furnace, heat up to 950 °C, and cool it after no more carbon dioxide is generated, and set aside;

[0057] S2. Determine the chemical composition of the hot-melt slag at 1200 °C using a spectroanalyzer, calculate the mass required for each component ratio of 10 kg of hot-melt slag, weigh 200 g of fly ash, 900 g of secondary aluminum ash, and 280 g of ascharite, mix them, and spray the powder into 10 kg of hot-melt slag at a speed of 60 kg / min using compressed air. Heat the crucible to 1550 °C for conditioning for 30 min and keep it warm for 10 min to obtain a homogeneous melt;

[0058] S3. Detect that the viscosity of the homogeneous melt is 2.4 Pa·s. Pour the homogeneous melt into a drainage trough, use a nozzle to spray high-speed air to produce slag wool fibers. The spraying height is 0.8 m and the flow rate of the sprayed high-speed air is 220 m / s to obtain slag wool fibers. Stop spraying when the homogeneous melt cools to 1450 °C, reheat it to 1550 °C, and spray again until the homogeneous melt is used up;

[0059] S4. Collect the slag wool fibers generated by spraying using a cotton collecting machine. The relative humidity of the air during the cotton collecting process is 60%. Spray a hydrophobic binder through an atomizing nozzle and spread the fibers into a uniform fiber mat through a cotton collecting belt;

[0060] S5. Send the fiber mat into a curing furnace, heat it at 120 °C for 2 h for curing and forming, and cut the edges to obtain a slag wool product.

[0061] The preparation method of the hydrophobic binder in this example includes the following steps:

[0062] S11. Add 190 g of phenol and 215 g of kaempferol to a reaction kettle, heat up to 60 °C. After the phenol melts, add 61 g of boric acid and react at 85 °C for 2 h, then add 45 g of formaldehyde and 2 g of sodium hydroxide, heat up to 70 - 80 °C and react for 1 - 2 h to obtain a prepolymer;

[0063] S12. Add 25 g of methylphenyl dimethoxysilane to the prepolymer, heat up to 95 °C and react for 3 h, and dehydrate under reduced pressure to obtain a heat-resistant phenolic resin;

[0064] S13. Dilute 200 g of the heat-resistant phenolic resin with 70 g of ethanol to prepare a hydrophobic binder.

[0065] Example 3. A method for recycling secondary aluminum ash and fly ash to prepare slag wool includes the following steps:

[0066] S1. After washing the fly ash and secondary aluminum ash with water, dry them at 140 °C, grind them through a 200-mesh sieve, put the fly ash into an electric resistance furnace, heat up to 1000 °C, and cool it after no more carbon dioxide is generated from the fly ash for standby;

[0067] S2. Use a spectroanalyzer to determine the chemical composition of the hot-melt slag at 1250 °C, calculate the mass required for each component ratio of 10 kg of hot-melt slag, weigh 300 g of fly ash, 800 g of secondary aluminum ash and 190 g of ascharite, mix them, and spray the powder into 10 kg of hot-melt slag at a speed of 100 kg / min with nitrogen. Heat the crucible to 1650 °C for conditioning for 40 min and keep it warm for 20 min to obtain a homogeneous melt;

[0068] S3. Detect that the viscosity of the homogeneous melt is 1.3 Pa·s. Pour the homogeneous melt into the drainage trough, use a nozzle to spray high-speed air flow to manufacture slag wool fibers. The spraying height is 1.1 m and the flow rate of the sprayed high-speed air flow is 230 m / s to obtain slag wool fibers. Stop spraying when the homogeneous melt cools to 1550 °C, reheat it to 1650 °C, and spray again until the homogeneous melt is used up;

[0069] S4. Collect the slag wool fibers generated by spraying through a cotton collecting machine. The relative humidity of the air during the cotton collecting process is 70%. Spray a hydrophobic binder through an atomizing nozzle and spread the fibers into a uniform fiber mat through a cotton collecting belt;

[0070] S5. Send the fiber mat into a curing furnace, heat it at 150 °C for 0.5 h for curing and forming, and cut the edges to obtain a slag wool product.

[0071] The preparation method of the hydrophobic binder in this example includes the following steps:

[0072] S11. Add 228 g of phenol and 286 g of kaempferol to a reaction kettle, heat up to 55 °C. After the phenol melts, add 61 g of boric acid and react at 95 °C for 2 h, then add 90 g of formaldehyde and 5 g of sodium hydroxide, heat up to 80 °C and react for 2 h to obtain a prepolymer;

[0073] S12. Add 30 g of methylphenyl dimethoxysilane to the prepolymer, heat up to 100 °C and react for 3 h, and dehydrate under reduced pressure to obtain a heat-resistant phenolic resin;

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

[0075] Example 4. A method for preparing slag wool by recycling secondary aluminum ash and fly ash includes the following steps:

[0076] S1. After washing the fly ash and secondary aluminum ash with water, dry them at 150 °C, grind them through a 300-mesh sieve, put the fly ash into an electric resistance furnace, heat up to 1000 °C, and cool it after the fly ash no longer produces carbon dioxide for standby;

[0077] S2. Determine the chemical composition of the hot-melt slag at 1300 °C using a spectroscopic analyzer, calculate the mass required for each component ratio of 10 kg of hot-melt slag, weigh 400 g of fly ash, 600 g of secondary aluminum ash, and 110 g of ascharite, mix them, and spray the powder into 10 kg of hot-melt slag at a speed of 150 kg / min using nitrogen. Heat the crucible to 1600 °C for tempering for 50 min and keep it warm for 20 min to obtain a homogeneous melt;

[0078] S3. Detect that the viscosity of the homogeneous melt is 1.3 Pa·s. Pour the homogeneous melt into a drainage trough, use a nozzle to blow high-speed air to produce slag wool fibers. The blowing height is 1.1 m, and the flow rate of the blown high-speed air is 230 m / s to produce slag wool fibers. Stop blowing when the homogeneous melt cools to 1550 °C, reheat it to 1650 °C, and blow again until the homogeneous melt is exhausted;

[0079] S4. Collect the slag wool fibers produced by blowing using a cotton collecting machine. The relative humidity of the air during the cotton collecting process is 50%. Spray a hydrophobic binder through an atomizing nozzle and spread the fibers into a uniform fiber mat through a cotton collecting belt;

[0080] S5. Send the fiber mat into a curing furnace, heat it at 150 °C for 1 h for curing and forming, and trim the edges to obtain a slag wool product.

[0081] The preparation method of the hydrophobic binder in this embodiment includes the following steps:

[0082] S11. Add 228 g of phenol and 143 g of kaempferol to a reaction kettle, heat up to 55 °C. After the phenol melts, add 61 g of boric acid and react at 90 °C for 2 h, then add 60 g of formaldehyde and 3 g of sodium hydroxide, heat up to 80 °C and react for 2 h to obtain a prepolymer;

[0083] S12. Add 25 g of methylphenyl dimethoxysilane to the prepolymer, heat up to 100 °C and react for 3 h, and dehydrate under reduced pressure to obtain a heat-resistant phenolic resin;

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

[0085] Comparative Example 1. The difference between this comparative example and Example 1 is that the hot-melt slag is replaced with blast furnace slag.

[0086] Comparative Example 2. The difference between this comparative example and Example 1 is that the relative humidity of the air during the cotton collecting process is replaced with 80%.

[0087] Comparative Example 3. The difference between this comparative example and Example 1 is that the hydrophobic binder is replaced with an asphalt binder.

[0088] Performance test

[0089] Measure the average fiber diameter, slag ball content, thermal conductivity, and heat load shrinkage temperature of the slag wool products prepared in each example and comparative example according to GB / T 5480-2017 "Test Methods for 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 "Horizontal Oscillation Method for Toxicity Leaching of Solid Waste", using deionized water as the leaching agent, add 100 g of the slag wool products prepared in each example and comparative example to 1 L of deionized water respectively. After shaking for 8 h and standing for 16 h, filter and collect the leachate, and send it to a relevant institution for testing the 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 property test: Take 10 g of the slag wool products prepared in each example and comparative example respectively, dry them to constant weight in an oven at 110 °C and record as m0. Place them under the conditions of a temperature of 35 °C and an air relative humidity of 90%, take them out after standing for 48 h, weigh the mass, and record as m1. Calculate the moisture absorption rate 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] Serial number 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, it can be seen that the average fiber diameter of the slag wool prepared in Examples 1-4 is between 2.3 and 3.7 μm, the slag ball content is between 6.19 and 6.38 wt%, and the thermal conductivity is 0.041-0.043 W·m -1 ·k -1Between them, it shows that the slag wool prepared by the present invention meets the requirements of industrial production and has excellent heat insulation performance; the heat load shrinkage temperature is between 780 and 784 °C, indicating that the slag wool prepared by the present invention has excellent high-temperature thermal stability and is suitable for working environments at higher temperatures. In Comparative Example 3, the binder was replaced with an asphalt binder. The lack of boron and silicon elements in the binder caused the slag wool prepared in this comparative example to have a decreased heat resistance performance in a high-temperature environment, resulting in a decrease in its stability in a high-temperature environment. Therefore, the heat load shrinkage temperature of the slag wool in Comparative Example 3 was only 750 °C, which was lower than that of the slag wool prepared in Examples 1 to 4.

[0104] As can be seen from the data in Table 2, the heavy metal leaching concentrations of the slag wool prepared in Examples 1 to 4 are all less than the third-class groundwater standard specified in GB 14848-2017 "Groundwater Quality Standard", indicating that the preparation of slag wool by the resource utilization of secondary aluminum ash and fly ash in the present invention can effectively inhibit the leaching of heavy metals and has a relatively small degree of environmental pollution.

[0105] As can be seen from the data in Table 3, the moisture absorption rate of the slag wool prepared in Examples 1 to 4 is between 5.2 and 5.5%, indicating that the slag wool prepared by the present invention has good hydrophobic properties. The relative air humidity during the cotton collection process in Comparative Example 2 was 80%, resulting in the inability of its hydrophobic binder 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 in this comparative example, which is higher than that of the slag wool prepared in Examples 1 to 4.

[0106] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

[0107] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to only the specific implementation manners. Obviously, many modifications and changes can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A method for preparing slag wool by resource utilization of secondary aluminum ash and fly ash, characterized in that: The steps include: S1. Wash the fly ash and secondary aluminum ash with water, dry them at 120-150°C, grind them through a 200-mesh sieve, put the fly ash into a resistance furnace, heat it to 900-1000°C, cool it down when the fly ash no longer produces carbon dioxide, and set it aside; S2. Determine the chemical composition of the hot slag at 1100-1300° C. by using a spectrum analyzer, calculate the mass ratio of each component of the hot slag, weigh the fly ash, secondary aluminum ash and magnesite according to the calculated results and mix them, spray the powder into the hot slag, heat the crucible to 1550-1650° C. for 30-50 min, and keep it warm for 10-20 min to obtain a homogeneous melt; S3. After the viscosity of the homogeneous melt is tested to be qualified, the homogeneous melt is poured into the drainage trough, and a high-speed airflow is sprayed through a nozzle to produce slag wool fiber. The homogeneous melt is cooled to 1450-1500°C and the spraying is stopped. The homogeneous melt is reheated to 1550-1650°C and sprayed again until the homogeneous melt is exhausted; S4, collecting the slag wool fibers produced by the spraying through a cotton collector, spraying a hydrophobic binder through an atomizing nozzle during the cotton collection process, and spreading the fibers through a cotton collecting belt into a uniform fiber felt; S5. Send the fiber felt into a curing furnace, heat it at 120-150°C for 0.5-2h to cure it, and cut the edges to obtain slag wool products.

2. The method for preparing slag wool by resource utilization of secondary aluminum ash and fly ash according to claim 1, characterized in that: The preparation method of the hydrophobic binder comprises the following steps: S11, adding phenol and kaempferol into a reaction kettle, heating to 50-60°C, adding boric acid to react at 85-95°C for 1-2h after the phenol is melted, then adding formaldehyde and sodium hydroxide, heating to 70-80°C for reaction for 1-2h to obtain a prepolymer; S12, adding methylphenyl dimethoxysilane to the prepolymer, raising the temperature to 95-100° C. for reaction for 2-3 hours, and decompressing and dehydrating to obtain a heat-resistant phenolic resin; S13, diluting the heat-resistant phenolic resin with ethanol to obtain a hydrophobic adhesive.

3. The method for preparing slag wool by resource utilization of secondary aluminum ash and fly ash according to claim 2, characterized in that: The molar ratio of phenol, kaempferol, boric acid and formaldehyde in S11 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; the amount of methylphenyldimethoxysilane added in S12 is 10-15% of the mass of phenol.

4. The method for preparing slag wool by 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%.

5. The method for preparing slag wool by resource utilization of secondary aluminum ash and fly ash according to claim 1, characterized in that: The acidity of the homogeneous melt in S2 is controlled to be 1.1-1.3, the magnesium-aluminum ratio is 0.3-0.6, the powder injection speed is 50-150 kg / min, and the injection gas is any one of nitrogen and compressed air.

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

7. The method for preparing slag wool by 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 collecting process in S4 is 50-70%.

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