Building material preparation method based on multi-source solid waste and composite fireproof insulation board

Abstract

The invention relates to the technical field of solid waste recycling, and discloses a building material preparation method based on multi-source solid waste and a composite fireproof insulation board. The preparation method of the building material based on the multi-source solid waste comprises the following steps: pretreatment of waste aerated concrete, pretreatment of silicon-calcium slag and marble processing tailings, pretreatment of waste photovoltaic panels, pretreatment of vanadium-titanium slag, pretreatment of stainless steel slag and waste incineration fly ash, pretreatment of coal slime and aluminum ash residues, pretreatment of waste wooden furniture, and treatment of the building material based on the multi-source solid waste. Preparation of UHPC and preparation of foam concrete; and the like. The composite fireproof insulation board comprises a foam concrete board layer located in the middle layer, UHPC board layers are arranged on the two sides of the foam concrete board layer, steel bar square grids are arranged between the foam concrete board layer and the UHPC board layers, the foam concrete board layer is formed by pouring prepared foam concrete, and the UHPC board layers are formed by pouring prepared UHPC.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solid waste recycling, in particular to a building material preparation method based on multi-source solid waste and a composite fireproof insulation board. BACKGROUND

[0002] In recent years, with the acceleration of industrial upgrading and urbanization, the output of industrial solid waste and construction solid waste in China has shown explosive growth. According to statistics, the annual output of typical multi-source solid waste such as waste aerated concrete, calcium-silicon slag, marble processing tailings, waste photovoltaic panels, vanadium-titanium ore slag, stainless steel slag, waste incineration fly ash, coal slime, and aluminum ash has exceeded 1 billion tons. Such solid waste is mostly disposed of by open-air storage or simple landfill, not only occupying a large amount of land resources, but also polluting the soil and groundwater through leachate and polluting the atmosphere through dust dispersion. In particular, waste photovoltaic panels contain glass and metal composite components, vanadium-titanium ore slag contains titanium / vanadium and other insoluble components, and waste incineration fly ash contains chlorine ions and heavy metals. Conventional disposal technologies cannot achieve harmless and high-value utilization, which has become a key bottleneck restricting the green development of industry.

[0003] The existing technical solutions of combining solid waste and building materials have certain limitations: Single use of solid waste: Most technologies only replace a single solid waste (such as fly ash and waste concrete) with a low mixing amount (mixing amount < 30%), and do not solve the problem of multi-source solid waste utilization. The use of difficult-to-dispose solid waste such as waste photovoltaic panels, aluminum ash, and waste incineration fly ash is almost blank; Insufficient activation of solid waste: There is a lack of system optimization of solid waste, and the activity of solid waste is not fully released. More than 50% of cement needs to be added to ensure performance, which cannot achieve the dual goals of "low carbon" and "high mixing amount of solid waste"; Poor product performance synergy: The existing composite insulation board (such as "inorganic panel + organic core material" sandwich structure) has low performance matching between the panel and the core material. For example, the thermal expansion coefficient of ordinary concrete panels and organic core materials is greatly different, and temperature changes can easily cause the panel to crack. If the core material is inorganic (such as ordinary foam concrete), the overall thermal conductivity is high, and the insulation and fireproof performance cannot be balanced. SUMMARY

[0004] In view of the above technical problems in the related art, the present application provides a building material preparation method based on multi-source solid waste and a composite fireproof insulation board, which can solve the above problems.

[0005] To achieve the above technical purposes, the technical solution of the present application is as follows: A building material preparation method based on multi-source solid waste is prepared by the following steps: S1, pretreatment of waste aerated concrete: first, the waste aerated concrete is screened by a vibrating screen to remove bricks and organic matter and other impurities; then, the large pieces of waste aerated concrete are sawed into blocks with a length of less than 25 cm, a thickness of less than 6 cm, and a width of less than 12 cm using a woodworking saw; then, the blocky waste aerated concrete is placed in a jaw crusher to be crushed into 1-3 mm waste aerated concrete particles, which are then placed in a 105°C electric hot air drying oven to dry to constant weight; part of the dried waste aerated concrete particles are placed in a cement ball mill to be ground into waste aerated concrete powder with a specific surface area of 200-300 m 2 / kg for standby; S2, pretreatment of silicon-calcium slag and marble processing tailings: first, the silicon-calcium slag and marble processing tailings are separately placed in a 105°C electric hot air drying oven to dry to constant weight, and the dried silicon-calcium slag and marble processing tailings are mixed in a mass ratio of 2-4:1-3 to obtain material A, which is placed in a cement mortar mixer and stirred for 60-90 s, and then 8-10% water based on the mass of material A is added and stirred for another 90-120 s; after uniform mixing, the mixture is placed in a mold and pressed into a cake one (cake thickness is 1-3 cm, diameter is 5-8 cm) by a hydraulic press, and the cake one is dried in an electric hot air drying oven for 20-30 min (drying temperature is 100°C); the dried cake one is placed in a covered corundum crucible, and the crucible is placed in a muffle furnace for high-temperature calcination (calcination schedule: from room temperature to 200°C at a rate of 4°C / min, then hold for 20-30 min; then from 200°C to the desired temperature of 750-850°C at a rate of 5°C / min, then hold for 30-50 min), and after calcination is completed, the cake one is rapidly cooled by air, and then placed in a cement ball mill to be ground to a specific surface area of 400-500 m 2 / kg to obtain powder one; S3, pretreatment of waste photovoltaic panels: first, remove the attachments (aluminum frames and adhesive strips, etc.) from the waste photovoltaic panels, then use high-pressure water to remove impurities and dust adsorbed on the surface of the photovoltaic panels, and after natural drying, use a hammer crusher to crush the waste photovoltaic panels into pieces with a particle size of ≤25 mm; then, the blocky waste photovoltaic panels are placed in a jaw crusher to be crushed into waste photovoltaic panel particles with a particle size of ≤2 mm for standby; S4, pretreatment of vanadium-titanium ore tailings: first, the vanadium-titanium ore tailings are screened by a hydrocyclone, and the slurry concentration is maintained at 25-40%, to obtain vanadium-titanium ore tailings particles with a particle size of ≤0.109 mm, 0.109-0.212 mm, 0.212-0.380 mm and ≥0.380 mm; the four kinds of particles are respectively placed in a 105℃ electric heat air drying oven and dried to constant weight for standby use; the vanadium-titanium ore tailings particles with a particle size of ≤0.109 mm and ≥0.380 mm after drying are put into a cement ball mill to be ground into vanadium-titanium ore tailings powder with a specific surface area of 200-300 m 2 / kg for standby use; S5, pretreatment of stainless steel slag and waste incineration fly ash: first, the stainless steel slag and waste incineration fly ash are respectively screened by a vibrating screen to obtain particles with a particle size of ≤2 mm and particles with a particle size of >2 mm; then the particles with a particle size of >2 mm are put into a jaw crusher to be crushed to particles with a particle size of ≤2 mm, and then mixed with the particles with a particle size of ≤2 mm obtained by screening, and placed in a 105℃ electric heat air drying oven to be dried to constant weight, to obtain stainless steel slag particles and waste incineration fly ash particles with a particle size of ≤2 mm; the stainless steel slag particles, waste incineration fly ash particles and vanadium-titanium ore tailings powder in S4 are put into a planetary ball mill in a mass ratio of 1-3:1:2-4 and uniformly mixed to obtain particle mixture B with a particle size of ≤2 mm; S6, pretreatment of coal slime and aluminum ash slag: the coal slime is placed in a 105℃ electric heat air drying oven to be dried to constant weight, and the dried coal slime is ground by a planetary ball mill to obtain coal slime particles with a particle size of ≤2 mm for standby use; the aluminum ash slag is screened to obtain particles with a particle size of ≤2 mm and particles with a particle size of >2 mm, and then the particles with a particle size of >2 mm are put into a jaw crusher to be crushed to particles with a particle size of ≤2 mm, and then mixed with the particles with a particle size of ≤2 mm obtained by screening, and placed in a 105℃ electric heat air drying oven to be dried to constant weight, to obtain aluminum ash slag particles with a particle size of ≤2 mm; the coal slime particles and aluminum ash slag particles are put into a planetary ball mill in a mass ratio of 2-4:1-3 and uniformly mixed to obtain particle mixture C with a particle size of ≤2 mm; S7, pretreatment of waste wooden furniture: first, the furniture is disassembled and then sawed into pieces with a length of <15 cm and a cross-sectional area of <30 cm 2 ; then the pieces are placed on a material rack, and the whole material rack is put into a dry distillation still, and the waste wooden pieces in the dry distillation still are carbonized by high-temperature flue gas (the temperature of the high-temperature flue gas is 500-700℃, and the carbonization time is 4-6h); the carbonized and cooled wooden pieces are taken out of the dry distillation still and put into a jaw crusher to be crushed to carbon particles with a particle size of ≤2 mm for standby use; S8, preparation of the second material cake: 1-3 mm waste aerated concrete particles in S1, powder one in S2, waste photovoltaic panel particles in S3, particle mixture B in S5, particle mixture C in S6 are mixed in a mass ratio of 10-15%:60-77%:5-10%:5-10%:3-5% to obtain a mixture D; then carbon particles in S7 are added to the obtained mixture D, wherein the carbon particles account for 5-8% of the total mass of the mixture D, and then put into a cement ball mill to grind to a specific surface area of 300-400 m 2 / kg of the fifth powder; then the fifth powder is put into a cement mortar mixer, stirred for 60-90 s, and then stirred for 90-120 s after adding 8-10% of water based on the mass of the fifth powder; after uniform mixing, the mixture is put into a mold and pressed into a second material cake (the thickness of the second material cake is 1-3 cm and the diameter is 5-8 cm) by a hydraulic press, and the second material cake is dried in an electric heating air drying oven for 20-30 min (the drying temperature is 100℃); S9, preparation of the second powder: the second material cake is put into a covered corundum crucible, and then the crucible is placed in a muffle furnace for high temperature calcination (calcination system: from room temperature to 300℃ at a heating rate of 3℃ / min, then heat preservation for 20-30 min; then from 300℃ to 1100-1200℃ at a heating rate of 10℃ / min, then heat preservation for 30-40 min), and then the high temperature calcination product is obtained by rapid cooling with air, and then crushed to a particle size of ≤2 mm low carbon particles by a jaw crusher, and then ground in a cement ball mill to a specific surface area of 400-500 m 2 / kg to obtain the second powder; S10, preparation of the third powder: first, the impurities in lithium slag and citric acid gypsum are screened out by a vibrating screen, and then dried in an electric heating air drying oven at 105℃ to a constant weight, and then the dried lithium slag and citric acid gypsum are mixed in a planetary ball mill in a mass ratio of 1:1-3 to obtain the third powder for standby; S11, preparation of the fourth powder: waste aerated concrete powder in S1, powder one in S2, vanadium-titanium slag powder in S4, third powder in S10, combined powder one of fly ash and silica fume are added into a superfine grinding machine, and then a water reducing agent is added, and then ground to obtain a fourth powder with a specific surface area of 1300-1500 m 2 / kg, wherein the mass ratio of waste aerated concrete powder, powder one, vanadium-titanium slag powder, third powder, fly ash and silica fume is 6-10%:13-18%:24-28%:7-11%:21-26%:12-29%, and the water reducing agent accounts for 3-5% of the total mass of the combined powder one; S12, preparation of the cotton stalk fiber: first, the cotton stalk raw material is subjected to core-skin separation and the peaches, leaves and twigs are removed to obtain a core material with a diameter of 5-15 mm, and the cotton stalk core material with a length of 150-250 mm is placed in a 70°C air-drying oven to dry to a moisture content of ≤10%; then the cotton stalk is placed in a rubbing machine for crushing, and then the cotton stalk fragments with a diameter of 25-60 mm are obtained by sieving; then the cotton stalk fragments are placed in a disc mill for disc milling (disc milling gap is 0.3-0.4 mm) to obtain cotton stalk fibers with a diameter of 30-65 um and a length of 5-25 mm; S13, preparation of the UHPC: first, the mixed dry material one of the powder and the coarse and fine aggregates is placed in a cement mortar mixer for dry mixing for 220-260 s, and the powder and the coarse and fine aggregates are powder two, powder four and coarse and fine sand, wherein the mass percentage of powder two, powder four and coarse and fine sand is 32-40%:10-15%:45-58%; then the water is divided into three parts, and each part is mixed with defoaming agent, retarder and high-performance expansive agent, respectively, and after being fully dissolved, two parts of the solution are sprinkled on the mixed dry material one, and stirred for 160-200 s until the mixed dry material one becomes a dough-like state, and then the remaining one part of the solution is added and stirred for 160-200 s to make the slurry reach a viscous flow state, wherein the amount of water, defoaming agent, retarder and expansive agent is 18-20%, 0.77-0.96‰, 0.38-0.58‰ and 1.5-2.9‰ of the total amount of powder, respectively; then the fibers are slowly added to the stirring mixer in 330-380 s, and after the fibers are added, the UHPC is obtained by stirring for 220-260 s, wherein the fibers contain steel fibers and polypropylene fibers, and the volume of the steel fibers and the polypropylene fibers accounts for 1.7-2.3 vol.% and 0.1-0.4 vol.% of the total volume of the UHPC, respectively (the UHPC is injected into a mold and compacted by a vibration table, and after 1d of standard curing, the mold is removed and immediately placed in a steam curing room with a temperature of 80-90°C for 3d to obtain the UHPC fireproof plate); S14, Preparation of foam concrete: first, the dry materials, 1-3 mm waste hard polyurethane particles and cotton straw fibers are put into a cement mortar mixer and mixed uniformly, the dry materials are 1-3 mm waste aerated concrete particles in S1, powder two in S9 and powder four in S11, wherein the mass percentage of waste aerated concrete particles, powder two and powder four is 5-10%: 35-60%: 35-55%, the addition amount of hard polyurethane particles is 0.1-0.25% of the total mass of powder two and powder four, and the addition amount of cotton straw fibers is 0.1-0.3 vol.% of the total volume of foam concrete; then 50-60 ℃ warm water and 5-11‰ total water amount of foam stabilizer are added according to the water-material ratio of 0.5-0.75, stirred for 80-100 s, then 0.5-0.7‰ aluminum powder of the total mass of dry materials is added, stirred for 30-50 s, and foam concrete is obtained (ensure that the mold temperature of foam concrete pouring is 45-50 ℃, after pouring into the mold, it is static and steamed for 8-10 h at a temperature of 50-60 ℃, and then standard curing is carried out for 2 d after demolding, immediately put into the steam curing room at a temperature of 80-90 ℃ for curing for 3 d, and foam concrete board can be obtained).

[0006] Optionally, the main mineral composition of the waste aerated concrete in S1 is quartz, tobermorite, calcite and C-S-H gel, and the main chemical components and contents are: SiO240-60%, Al2O33-8%, CaO 20-30%, MgO 1-5%, Fe2O31-5%, SO31-5%, K2O+Na2O 0.1-2%, and the loss on ignition of the waste aerated concrete is 5-15%.

[0007] Optionally, the main mineral composition of the silicon-calcium slag in S2 is quartz, C2S, calcite and mullite, and the main chemical components and contents are: CaO 42-52%, SiO218-36%, Al2O36-19%, Fe2O31-5%, MgO 1-5%, and the loss on ignition of the silicon-calcium slag is 15-30%.

[0008] Optionally, the main mineral composition of the marble processing tailings in S2 is calcium carbonate, and the main components and contents are: CaO 50-62%, SiO20.1-5%, Al2O30.1-3%, Fe2O30.1-2%, MgO 0.01-3%, K2O+Na2O 0.01-2%, and the loss on ignition of the marble processing tailings is 30-50%.

[0009] Optionally, the main chemical components and contents of the waste photovoltaic panel in S3 are: SiO260-83%, CaCl20.1-5%, NaCl 16-38%, and the loss on ignition of the waste photovoltaic panel is 0.1-8%.

[0010] Optionally, in S4, the main mineral composition of the vanadium-titanium slag is magnesian rossite and perovskite, and the main chemical components and contents are: SiO2 27-33%, CaO 30-35%, Al2O3 8-15%, MgO 8-12%, Fe2O3 5-10%, SO3 0.1-3%, K2O+Na2O 0.1-2%, TiO2 5-10%, and the loss on ignition of the vanadium-titanium slag is 0.1-3%.

[0011] Optionally, in S5, the main mineral composition of the stainless steel slag is C2S, C3S and RO phase, and the main chemical components and contents are: SiO2 27-37%, CaO 40%-50%, Al2O3 1-3%, MgO 5-8%, Fe2O3 1-8%, K2O+Na2O 0.01-2%, P2O5 0.1-2%, and the loss on ignition of the stainless steel slag is 1-6%.

[0012] Optionally, in S5, the main chemical components and contents of the waste incineration fly ash are: CaO 25-45%, SiO2 1-10%, Al2O3 1-5%, Fe2O3 0.1-5%, MgO 1-8%, FeO 0.01-2%, Na2O 1-7%, K2O 1-7%, Cl 10-30%, and the loss on ignition of the waste incineration fly ash is 0.01-5%.

[0013] Optionally, in S6, the main mineral composition of the coal slime is kaolinite, quartz, pyrite and dolomite, and the chemical components and contents are: SiO2 35-65%, Al2O3 12-36%, Fe2O3 1-13%, FeO 0.1-6%, MgO 0.1-6%, CaO 1-14%, Na2O 0.01-2%, K2O 0.01-2%, SO3 0.1-4%, the loss on ignition of the coal slime is 20-30%, the fixed carbon content is 27-35%, and the calorific value is 1700-3300 kilocalories per kilogram.

[0014] Optionally, in S6, the aluminum ash slag is fine ash after separation of metallic aluminum, and the main chemical components and contents are: SiO2 6-14%, Al2O3 53-71%, AlN 16-26%, AlCl3 1-6%, AlF3 1-6%, and the loss on ignition of the aluminum ash slag is 6-24%.

[0015] Optionally, in S7, the main chemical elements and contents of the waste wooden furniture are: C 35-55%, H 1-5%, O 30-50%, N 0.01-1%, S 0.01-1.5%, water 1-5%, ash 2-5%, the volatile matter of the waste wooden furniture is 60-85%, and the fixed carbon is 5-11%.

[0016] Optionally, the main mineral composition of the lithium residue in S10 is quartz, spodumene, gypsum, etc., and the chemical composition and content are: CaO 22~30%, SiO2 45~55%, Al2O3 16~22%, SO3 18~23%, Fe2O3 0.1~3%, and other 0.1~3%; the main mineral composition of the citric acid gypsum is CaSO4·2H2O and CaSO4·1 / 2H2O, and the main chemical composition and content are: SO3 30~50%, CaO 20~40%, SiO2 2~5%, P2O5 1~3%, MgO 0.01~2%, Na2O 0.01~1%, Fe2O3 0.01~5%, K2O 0.01~1%, and the loss on ignition of the citric acid gypsum is 15~25%.

[0017] Optionally, the main mineral composition of the fly ash in S11 is quartz and mullite, and the main chemical composition and content are: SiO2 40~50%, Al2O3 25~35%, CaO 5~12%, Fe2O3 5~8%, MgO 0.1~2%, SO3 2~10%, K2O 0.5~2%, Na2O 0.1~0.5%, and the loss on ignition is 3~7%; the silica ash has a particle size of 0.1~1um, and the SiO2 content, apparent density, specific surface area, and pozzolanic activity index are 88.54%, 2.19g / m 3 , 17800m 2 / kg, and 108%, respectively; the water reducing agent is a high-performance polycarboxylic acid powder water reducing agent, and the water reducing rate is >30%; the maximum feeding particle size of the superfine grinding mill is ≤20mm, and the product particle size is 325~2500 meshes.

[0018] Optionally, the cotton straw fiber in S12 contains 15~20% of lignin and 30~40% of α-cellulose, and the main chemical elements of the cotton straw fiber are: C 40~46%, H 5~6%, O 43~50%, N 0.6~1.1%, S 0.1~0.2%, and ash 4.14%.

[0019] Optionally, in S13, the composition of the coarse sand is fine sand and coarse sand, and the mass percentage of the fine sand and the coarse sand is 1:1-2; the particle size of the coarse sand is 0.212-0.380 mm, and the particle size of the fine sand is 0.109-0.212 mm; the mass percentage of the vanadium-titanium slag particles of 0.109-0.212 mm in the fine sand and the quartz sand fine sand is 1:1-3, and the mass percentage of the vanadium-titanium slag particles of 0.212-0.380 mm in the coarse sand and the quartz sand coarse sand is 1:2-4; the defoaming agent is at least one of tributyl phosphate or silicone defoaming agent, the retarder is boric acid, the main chemical composition and content of the high-performance expansive agent are SiO2 5-10%, Al2O3 25-30%, Fe2O3 1-7%, CaO 30-40%, MgO 1-3%, and SO3 18-23%, the loss on ignition of the high-performance expansive agent is 0.1-1%; the fiber used in the UHPC is steel fiber and polypropylene fiber, wherein the steel fiber is two kinds of steel fiber with a diameter of 0.2 mm and a length of 13 mm and steel fiber with a diameter of 0.16 mm and a length of 6 mm, the amount of the two kinds of steel fiber (i.e., the two kinds of steel fiber with a diameter of 0.2 mm and a diameter of 0.16 mm) is 1:1 in mass percentage, and the polypropylene fiber has a diameter of 30 μm and a length of 19 mm; in the preparation process of the UHPC slurry, the stirring speed of the cement mortar mixer is low speed stirring.

[0020] Optionally, in S1, S3, S5, S6, S7, and S9, the feeding particle size of the jaw crusher is ≤250 mm, and the discharging particle size is ≤10 mm.

[0021] Optionally, in S1, S2, S4, S8, and S9, the rotation speed of the cement ball mill is 48 r / min.

[0022] Optionally, in S2 and S8, the pressure for the press forming is 15-25 MPa.

[0023] Optionally, in S2 and S8, the formed body pellets obtained by the press forming are more easily fully calcined in the muffle furnace to obtain high-quality raw materials.

[0024] Optionally, in S2, S8, S13, and S14, low speed stirring is adopted by using a cement mortar mixer, and the low speed stirring rotation speed is: revolution 140±5 r / min and rotation 62±5 r / min, or revolution 285±10 r / min and rotation 125±10 r / min.

[0025] Optionally, in S3, the feeding particle size of the hammer crusher is ≤450 mm, and the discharging particle size is ≤25 mm.

[0026] Optionally, in S5, S6, and S10, the dispersion time of the planetary ball mill is 15-20 min, and the rotation speed of the mill is 200 r / min.

[0027] Optionally, the cooling in S9 comprises: cooling to 1000 DEG C at a wind speed of 18-20 DEG C / min, and then cooling to room temperature.

[0028] Optionally, the foam stabilizer is prepared from trinitrotoluene, distilled water and sodium stearoyl lactylate, and the corresponding proportions of trinitrotoluene, distilled water and sodium stearoyl lactylate are 5-10%, 86-94% and 1-5%, respectively.

[0029] A composite fireproof insulation board comprises a foam concrete board layer in a middle layer, UHPC board layers on both sides of the foam concrete board layer, and a steel mesh lattice between the foam concrete board layer and the UHPC board layers, wherein the foam concrete board layer is prepared by pouring the prepared foam concrete, and the UHPC board layer is prepared by pouring the prepared UHPC.

[0030] The beneficial effects of the present application are as follows: In the process of preparing high-temperature calcined products by taking calcareous materials (silicon-calcium slag, marble processing tailings), siliceous materials (waste aerated concrete, waste photovoltaic panels), iron-aluminum materials (vanadium-titanium ore slag, stainless steel slag, waste incineration fly ash, coal slime, aluminum ash slag) as raw materials, the present application plays a synergistic role by regulating multiple processes, forms the best match, makes the calcined products form a specific crystal structure (C2S, C3S, C3A and C4AF), realizes excellent early, middle and late performance, and can replace Portland cement clinker.

[0031] The low-carbon powder produced by high-temperature calcination is applied to the production of inorganic composite boards, so that the UHPC board and the foam concrete board have higher physical and mechanical properties, which are significantly better than the existing similar P·O 42.5 ordinary portland cement clinker; meanwhile, the low-carbon powder has good characteristics of significantly low alkali (alkali content < 0.45%, better than GB / T 21372-2024 ≤ 0.60), high strength (3d compressive strength ≥ 30.4 MPa, 28d compressive strength ≥ 55.6 MPa, better than the requirement of 3d compressive strength ≥ 22.0 MPa and 28d compressive strength ≥ 42.5 MPa of 42.5 cement clinker in the standard), low heat (3d hydration heat ≤ 200 kJ / kg, 7d hydration heat ≤ 219 kJ / kg, better than 3d hydration heat ≤ 230 kJ / kg and 7d hydration heat ≤ 260 kJ / kg of low-heat cement clinker in GB / T 21372-2024), low chlorine (chloride ion content ≤ 0.04, better than the requirement of ≤ 0.06 in GB / T 21372-2024). The construction period can be shortened, which has important significance for road and bridge repair, building decoration, municipal engineering rush construction and repair, and as material and wartime emergency reserve technology.

[0032] The low-carbon powder and vanadium-titanium ore slag are used to replace cement and quartz sand in the production of traditional inorganic composite fireproof insulation boards, so that the emission of CO2 and the consumption of natural resources are reduced. The abandoned hard polyurethane foam and waste aerated concrete are used as light aggregates to reduce the bulk density (dry density ≤ 350 kg / m 3 , better than the requirement of ≤ 400 kg / m 3 in JG / T 266-2011), the thermal conductivity (≤ 0.06 / [W / (mˑK)], better than the requirement of ≤ 0.10 in JG / T 266-2011) and the water absorption (≤ 13.6%, better than the requirement of ≤ 15% in JG / T 266-2011) of the insulation material, so that good heat insulation performance and heat insulation effect are ensured, and the coordination of density, strength (≥ 2.27 MPa, better than the requirement of ≥ 2.0 MPa in JG / T 266-2011) and heat insulation performance is realized.

[0033] The waste used in the application includes: waste aerated concrete, silicon calcium slag, marble processing tailings, waste photovoltaic panels, vanadium titanium ore slag, stainless steel slag, waste incineration fly ash, coal slime, aluminum ash, fly ash, waste wooden furniture, lithium slag, citric acid gypsum, silica ash, cotton straw, and waste rigid polyurethane foam. The mechanical performance index (strength), physical performance index (density, thermal conductivity), and combustion performance of the prepared inorganic composite board respectively reach the index requirements of A1 level in Cement-based Foam Insulation Board (JC / T 2200-2013) and Combustion Performance Classification of Building Materials and Products (GB 8624-2012). The application improves the utilization rate of industrial solid waste, and replaces a large amount of quartz sand and silica ash in the production of traditional UHPC with solid waste, significantly reducing the production cost of enterprises, and achieving remarkable economic and social environmental benefits.

[0034] In the composite fireproof insulation board, the inorganic material (foam concrete) is used in the middle layer to replace the organic insulation material that is easy to cause fire. The foam concrete material is non-combustible and aging-resistant, and is a cement-based material like UHPC, has similar compatibility characteristics, and can form a natural and reliable mutual connection. Compared with the structure of the "sandwich" wallboard, a large number of connecting pieces can be saved. At the same time, the foamed concrete only serves as an insulation material, and can be made as low-density as possible to meet the insulation requirements of different regions. The performance indicators of the UHPC composite board prepared in the embodiment of the application are all higher than the index requirements in Ultra High Performance Concrete GB / T 31387-2025, including 28 mechanical performance (compressive strength ≥ 182.6 MPa, tensile strength ≥ 8.4 MPa, bending strength ≥ 28.1 MPa, and elastic modulus ≥ 50.4 MPa), 90d durability indicators, and the combustion performance reaches A1 level, meeting the index requirements in Combustion Performance Classification of Building Materials and Products GB 8624-2012. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0036] The application will be further described in detail below with reference to the drawings.

[0037] Figure 1 is a structure diagram of the composite fireproof insulation board described in the embodiment of the application; Figure 2 is a front view (or rear view) of the composite fireproof insulation board described in the embodiment of the application; Figure 3is a side view of the composite fireproof insulation board according to the embodiment of the present application; Figure 4 is a preparation process flow chart of the composite fireproof insulation board according to the embodiment of the present application; Figure 5 is a preparation process flow chart of the UHPC board according to the embodiment of the present application; Figure 6 is a preparation process flow chart of the foam concrete board according to the embodiment of the present application; Figure 7 is a real picture of the appearance form of the UHPC specimen with composite fibers and the ordinary UHPC specimen without composite fibers at 20℃ (a), 200℃ (b), 400℃ (c), 600℃ (d), 800℃ (e) (contour legend: blue-heat triggered polymer fibers, green-melted heat triggered polymer fibers, yellow-foaming product, red-peeling condition, pink-charring layer); Figure 7 a), 200℃ (b), 400℃ (c), 600℃ (d), 800℃ (e) (contour legend: blue-heat triggered polymer fibers, green-melted heat triggered polymer fibers, yellow-foaming product, red-peeling condition, pink-charring layer); Figure 7 a), 200℃ (b), 400℃ (c), 600℃ (d), 800℃ (e) (contour legend: blue-heat triggered polymer fibers, green-melted heat triggered polymer fibers, yellow-foaming product, red-peeling condition, pink-charring layer); Figure 7 a), 200℃ (b), 400℃ (c), 600℃ (d), 800℃ (e) (contour legend: blue-heat triggered polymer fibers, green-melted heat triggered polymer fibers, yellow-foaming product, red-peeling condition, pink-charring layer); Figure 7 a), 200℃ (b), 400℃ (c), 600℃ (d), 800℃ (e) (contour legend: blue-heat triggered polymer fibers, green-melted heat triggered polymer fibers, yellow-foaming product, red-peeling condition, pink-charring layer); Figure 7 a), 200℃ (b), 400℃ (c), 600℃ (d), 800℃ (e) (contour legend: blue-heat triggered polymer fibers, green-melted heat triggered polymer fibers, yellow-foaming product, red-peeling condition, pink-charring layer); Figure 8 is an XRD spectrum of the foam concrete neat paste with different curing ages (FW-1-1d, FW-2-3d, FW-3-7d, FW-4-28d) according to the embodiment of the present application; Figure 9 is a SEM picture of the pore wall section of the foam concrete with different curing ages (a1, b1, c1 are respectively 3000 times SEM pictures of the outer surface of the product pore wall after the product is cured for 1d, 3d and 28d, a2, b2, c2 are respectively 10000 times SEM pictures of the corresponding A, B, C areas of the outer surface of the product pore wall). DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in the present application belong to the scope of protection of the present application.

[0039] As Figures 1-4The diagram shows the structure and manufacturing process of the composite fireproof insulation board of this application. The composite fireproof insulation board is a 200mm thick composite board with three layers: outer, inner, and outer. The outer layer of the composite board is a 20mm thick UHPC board layer 1 (cast from UHPC), and the middle layer is a 160mm thick foamed concrete board layer 2 (cast from foamed concrete). Two layers of ø8 steel reinforcement mesh (composed of horizontal reinforcement 3 and vertical reinforcement 4) are designed on both sides of the middle layer near the UHPC. The mesh size is (170~230)mm×(170~230)mm. The nodes are tied with flame-bonded wire. In order to fix the steel reinforcement mesh, tie rods 5 with a height of 190~198mm are set in the UHPC board on both sides. The tie rods are designed as "I" shapes and are made of ø14 steel bars welded together. The number of tie rods is set according to the number of nodes in each row of steel reinforcement mesh. The tie rods are 50mm away from the edge of the board and are evenly distributed according to the number. In the prefabrication of composite fireproof and heat-insulating panels, the construction is carried out according to the following steps: ① First, the formwork of the UHPC panel with a single-sided 20mm thickness is erected, and tie bolts are installed. After the concrete is poured, vibrated, demolded, and cured, the formwork is completed. ② Using the single-sided formed UHPC panel as the bottom formwork, the reinforcement is laid, tied, and the formwork is erected. Then, the foamed concrete is poured, demolded, and cured. ③ Using the formed UHPC and foamed concrete as the bottom formwork, the formwork erection, pouring, demolding, and curing of the outermost UHPC panel are completed.

[0040] like Figures 5-6 The diagram shows the preparation process of the UHPC board and the foamed concrete board of this application. The following is a detailed description through specific embodiments.

[0041] Example 1 The preparation of UHPC boards and foamed concrete boards includes the following steps: S1. Pretreatment of Waste Aerated Concrete: First, the waste aerated concrete is screened using a vibrating screen to remove impurities such as bricks and organic matter. Then, large pieces of waste aerated concrete are cut into blocks less than 25cm in length, less than 6cm in thickness, and less than 12cm in width using a wood saw. The blocks are then crushed into 1mm particles using a jaw crusher. The particles are then dried in a 105℃ electric heating forced-air drying oven until constant weight is achieved. A portion of the dried waste aerated concrete particles are then ground in a cement ball mill to achieve a specific surface area of ​​200 m². 2 / kg of waste aerated concrete powder is available for use; S2, pretreatment of silicon calcium slag and marble processing tailings: first, the silicon calcium slag, marble processing tailings are placed in 105℃ electric heating drying oven to dry to constant weight, the dried silicon calcium slag, marble processing tailings are mixed in a mass ratio of 2:1 to obtain material A, the material A is put into the cement mortar mixer, stirred for 60s, then 8% of the mass of material A is added and stirred for 90s; after mixing evenly, the mixture is put into the mold, and the material cake one (the material cake thickness is 1cm, and the diameter is 5cm) is pressed by the hydraulic pressure machine, and the material cake one is placed in the electric heating drying oven and dried for 20min (the drying temperature is 100℃); the dried material cake one is put into the covered corundum crucible, and the crucible is placed in the muffle furnace for high temperature calcination (calcination system: from room temperature to 200℃, the heating rate is 4℃ / min, then the temperature is kept for 20min; then from 200℃ to the required temperature 750℃, the heating rate is 5℃ / min, then the temperature is kept for 30min), after calcination, the material cake one is quickly cooled by air, and then the cooled material cake one is put into the cement ball mill for grinding to a specific surface area of 400m 2 / kg, to obtain the powder one; S3, pretreatment of waste photovoltaic panel: first, the attached objects (aluminum frame and adhesive tape, etc.) of the waste photovoltaic panel are removed, then the impurities and dust adsorbed on the surface of the photovoltaic panel are removed by high-pressure water, and after natural air drying, the waste photovoltaic panel is broken into pieces with a particle size of ≤25mm by using a hammer crusher; then the blocky waste photovoltaic panel is put into a jaw crusher to be broken into waste photovoltaic panel particles with a particle size of ≤2mm for standby use; S4, pretreatment of vanadium-titanium ore slag: first, the vanadium-titanium ore slag is screened by a hydrocyclone, and the concentration of the slurry is kept at 25%, to obtain vanadium-titanium ore slag particles with a particle size of ≤0.109mm, a particle size of 0.109~0.212mm, a particle size of 0.212~0.380mm and a particle size of ≥0.380mm; the four kinds of particles are placed in a 105℃ electric heating drying oven to dry to constant weight for standby use; the vanadium-titanium ore slag particles with a particle size of ≤0.109mm and a particle size of ≥0.380mm are put into a cement ball mill to be ground into vanadium-titanium ore slag powder with a specific surface area of 200m 2 / kg for standby use; S5, pretreatment of stainless steel slag and waste incineration fly ash: first, the stainless steel slag and waste incineration fly ash are screened by using a vibrating screen to obtain particles with a particle size of ≤2mm and particles with a particle size of >2mm; then the particles with a particle size of >2mm are put into a jaw crusher to be broken into particles with a particle size of ≤2mm, and then the particles with a particle size of ≤2mm obtained by screening are mixed with the particles with a particle size of ≤2mm to be placed in a 105℃ electric heating drying oven to dry to constant weight, to obtain stainless steel slag particles and waste incineration fly ash particles with a particle size of ≤2mm; the stainless steel slag particles, waste incineration fly ash particles and vanadium-titanium ore slag powder in S4 are put into a planetary ball mill in a mass ratio of 1:1:2 and mixed uniformly to obtain particle mixture B with a particle size of ≤2mm; S6, pretreatment of coal slime and aluminum ash: the coal slime was placed in a 105°C electric hot air drying oven to dry to constant weight, and the dried coal slime was ground by a planetary ball mill to obtain coal slime particles with a particle size of ≤2 mm for standby; the aluminum ash was sieved to obtain particles with a particle size of ≤2 mm and particles with a particle size of >2 mm, and then the particles with a particle size of >2 mm were put into a jaw crusher to be broken to particles with a particle size of ≤2 mm, and then mixed with the particles with a particle size of ≤2 mm sieved by a vibrating screen, and placed in a 105°C electric hot air drying oven to dry to constant weight, to obtain aluminum ash particles with a particle size of ≤2 mm; the coal slime particles and the aluminum ash particles were put into a planetary ball mill in a mass ratio of 2:1 and ball-mixed to obtain a particle mixture C with a particle size of ≤2 mm; S7, pretreatment of waste wooden furniture: first, the furniture was disassembled, and then sawed into pieces with a length of <15 cm and a cross-sectional area of <30 cm 2 , and then the pieces were placed on a material rack, and the whole material rack was put into a dry distillation kettle, and the waste wooden pieces in the dry distillation kettle were carbonized by high-temperature flue gas (the temperature of the high-temperature flue gas was 500°C, and the carbonization time was 4h); the carbonized and cooled wooden pieces were taken out from the dry distillation kettle and put into a jaw crusher to be broken to carbon particles with a particle size of ≤2 mm for standby; S8, preparation of the second material cake: 1 mm waste aerated concrete particles in S1, powder one in S2, waste photovoltaic panel particles in S3, particle mixture B in S5, and particle mixture C in S6 were mixed in a mass ratio of 10%:77%:5%:5%:3% to obtain a mixture D; carbon particles in S7 were added to the obtained mixture D, wherein the carbon particles accounted for 5% of the total mass of the mixture D, and then put into a cement ball mill to be ground to a powder five with a specific surface area of 300 m 2 / kg; then the powder five was put into a cement mortar mixer and stirred for 60 s, and then 8% of water based on the mass of the powder five was added and stirred for 90 s; after uniform mixing, the mixture was placed in a mold and pressed into a second material cake (the thickness of the second material cake was 1 cm, and the diameter was 5 cm) by a hydraulic press, and the second material cake was placed in an electric hot air drying oven and dried for 20 min (the drying temperature was 100°C); S9, preparation of the second powder: the second material cake was put into a covered corundum crucible, and then the crucible was placed in a muffle furnace for high-temperature calcination (calcination system: from room temperature to 300°C at a heating rate of 3°C / min, and then kept for 20 min; then from 300°C to 1100°C at a heating rate of 10°C / min, and then kept for 30 min), and after calcination, the high-temperature calcination product was quickly cooled by air, and then broken by a jaw crusher to low-carbon particles with a particle size of ≤2 mm, and then put into a cement ball mill to be ground to a second powder with a specific surface area of 400 m 2 / kg; S10, preparation of the third powder: first, the impurities in the lithium slag and citric acid gypsum are removed by using a vibrating screen, and then the lithium slag and citric acid gypsum are dried to constant weight in a 105°C electric hot air drying oven, and then the dried lithium slag and citric acid gypsum are put into a planetary ball mill in a mass ratio of 1:1 to mix uniformly to obtain the third powder for standby; S11, preparation of the fourth powder: the combination of the waste aerated concrete powder in S1, the first powder in S2, the vanadium-titanium slag powder in S4, the third powder in S10, fly ash and silica fume is added into a superfine grinding machine, and then a water reducing agent is added, and the combination is ground to obtain the fourth powder with a specific surface area of 1300m 2 S12, preparation of the cotton straw fiber: first, the cotton straw raw material is subjected to skin-core separation and the peach, leaves and twigs are removed to obtain core material with a diameter of 5-15mm, and the cotton straw core material with a length of 150-250mm is placed in a 70°C air drying oven to dry to a moisture content of less than or equal to 10%; then the cotton straw is put into a rubbing machine for crushing, and then the cotton straw fragments with a diameter of 25-60mm are obtained by screening; then the cotton straw fragments are put into a disc mill for disc milling (the disc milling gap is 0.3mm-0.4mm) to obtain cotton straw fibers with a diameter of 30um and a length of 5mm; S13, preparation of UHPC: first, the mixed dry material one of the powder and coarse and fine aggregate is placed in a cement mortar mixer for dry mixing for 220s, and the powder and coarse and fine aggregate are the second powder, the fourth powder and coarse and fine sand, and the mass percentage of the second powder, the fourth powder and coarse and fine sand is 40%:15%:45%; then the water is divided into three equal parts, and each part is mixed with a defoaming agent, a retarder and a high-performance expansive agent, and after being fully dissolved, two parts of the solution are sprinkled on the mixed dry material one, and stirred for 160s until the mixed dry material one becomes like a dough, and then the remaining one part of the solution is added, and stirred for another 160s to make the slurry reach a viscous flow state, wherein the amount of water, defoaming agent, retarder and expansive agent is 18%, 0.77‰, 0.38‰ and 1.5‰ of the total amount of powder, respectively; then the fibers are slowly added to the stirring mixer within 330s, and after the addition of the fibers is completed, the stirring is continued for 220s to obtain UHPC, and the fibers contain steel fibers and polypropylene fibers, and the volume of the steel fibers and the polypropylene fibers accounts for 1.7vol.% and 0.1 vol.% of the total volume of UHPC, respectively (the UHPC is poured into a mold and vibrated with a vibration table, and after 1d of standard curing, the mold is removed and immediately placed in a steam curing room at a temperature of 80°C for 3d to obtain a UHPC fireproof plate); ​S14, Preparation of foam concrete: first, the dry materials, 1mm waste hard polyurethane particles and cotton straw fibers are put into the cement mortar mixer to mix evenly, the dry materials are 1mm waste aerated concrete particles in S1, powder two in S9 and powder four in S11, wherein the mass percentage of waste aerated concrete particles, powder two and powder four is 5%:60%:35%, the addition amount of hard polyurethane particles is 0.1% of the total mass of powder two and powder four, and the addition amount of cotton straw fibers is 0.1vol.% of the total volume of foam concrete; then 50℃ warm water and 5‰ total water amount of foam stabilizer are added according to the water material ratio of 0.5, stirred for 80s, then 0.5‰ aluminum powder of the total mass of dry materials is added, stirred for 30s, to obtain foam concrete (ensure that the mold temperature of foam concrete pouring is 45℃, after pouring into the mold, it is static and steamed for 8h under the condition of temperature 50℃, then standard curing is carried out for 2d after demolding, immediately put into the steam curing room with temperature of 80℃ for curing for 3d, to obtain foam concrete board).

[0042] The mass percentage of coarse sand and fine sand in the coarse and fine sand is 1:1, the mass percentage of vanadium-titanium mine slag sand and quartz sand fine sand with particle size of 0.109~0.212mm in the fine sand is 1:1, and the mass percentage of vanadium-titanium mine slag sand and quartz sand coarse sand with particle size of 0.212~0.380mm in the coarse sand is 1:2. The two kinds of steel fibers are used in an amount of 1:1 by mass percentage. The corresponding proportion of trinitrobenzene, distilled water and sodium stearoyl lactate in the foam stabilizer is 5%:94%:1%. In S2 and S8, the pressure for pressing into shape is 15 MPa, the dispersion time of the planetary ball mill in S5, S6 and S10 is 15min, and the cooling in S9 includes: first cooling to 1000℃ at a wind speed of 18℃ / min, and then cooling to room temperature.

[0043] The powder three prepared according to step S10, and the mixed lithium slag and citric acid gypsum meet the technical index requirements specified in GB / T 21371-2019 “Industrial By-product Gypsum for Use in Cement”. The total amount of CaSO4·2H2O and CaSO4 in the mixed industrial by-product gypsum is 79% (the specification requires ≥75%), the chloride ion content is 0.47% (the specification requires ≤0.5%), the pH value is 4.2 (the specification requires ≤5), and the radioactive material limit value meets the requirements in GB 6566 (internal radiation index ≤1.0, external radiation index ≤1.0).

[0044] In example 1, the physicochemical properties of the powder one in step S2 (see table 1), the chemical composition analysis and activity index of the low-carbon powder two in step S9 (see table 2 and table 3), the radioactivity results of the powder four in step S11 (see table 4), the performance index of the UHPC board in step S13 (see table 5), and the performance index of the foam concrete board in step S14 (see table 6).

[0045] Table 1 Physico-chemical properties of powder 1 in Example 1-S2

[0046] Note: The technical index is that of Quicklime for Silicate Building Products JC / T 621-2021.

[0047] Table 2 Chemical composition of low-carbon powder 2 in Example 1-S9

[0048] Table 3 Activity index of low-carbon powder 2 in Example 1-S9

[0049] Note: * is the test method of Cement and Cementitious Materials-Determination of Strength Properties of Hardened Cement Mortar (ISO Method) GB / T 17671-2021.

[0050] Table 4 Radioactivity test results of dry material in Example 1-S11

[0051] Note: * is the test index requirement in Building Materials Radionuclide Limit GB 6566-2010.

[0052] Table 5 Performance index of UHPC plate in Example 1-S13

[0053] Note: * is Technical Requirements for Ultra High Performance Concrete (UHPC) T / CECS 10107-2020; ** is UHPC GB / T 31387-2025; *** is Classification of Building Materials and Products for Combustion Performance GB 8624-2012.

[0054] Table 6 Performance index of foam concrete plate in Example 1-S14

[0055] Note: * is the test index requirement in Foam Concrete JG / T 266-2011.

[0056] Example 2 The preparation of UHPC plate and foam concrete plate includes the following steps: S1, pretreatment of waste aerated concrete: first, the waste aerated concrete is screened by a vibrating screen to remove bricks and organic impurities; then the large pieces of waste aerated concrete are sawed into blocks with a length of less than 25 cm, a thickness of less than 6 cm and a width of less than 12 cm using a woodworking saw; then the blocky waste aerated concrete is put into a jaw crusher to be crushed into 2mm waste aerated concrete particles, and the waste aerated concrete particles are placed in a 105℃ electric heat air drying oven to dry to constant weight; part of the dried waste aerated concrete particles are placed in a cement ball mill to be ground into waste aerated concrete powder with a specific surface area of 250 m 2 / kg for standby; S2, pretreatment of silicon calcium slag and marble processing tailings: first, the silicon calcium slag and marble processing tailings are respectively placed in a 105℃ electric heat air drying oven to dry to constant weight, and the dried silicon calcium slag and marble processing tailings are mixed in a mass ratio of 3:2 to obtain material A; material A is placed in a cement mortar mixer and stirred for 75s, and then 9% of water by mass of material A is added and stirred for another 105s; after uniform mixing, the mixture is placed in a mold and pressed into a cake (cake thickness is 2cm, diameter is 7cm) by a hydraulic press; the cake is placed in an electric heat air drying oven and dried for 25min (drying temperature is 100℃); the dried cake is placed in a covered corundum crucible, and the crucible is placed in a muffle furnace for high-temperature calcination (calcination schedule: from room temperature to 200℃ at a rate of 4℃ / min, then keep at 200℃ for 25min; then from 200℃ to the required temperature 800℃ at a rate of 5℃ / min, then keep at 800℃ for 40min); after calcination, the cake is rapidly cooled by air, and then the cooled cake is placed in a cement ball mill to be ground to a specific surface area of 450 m 2 / kg to obtain powder one; S3, pretreatment of waste photovoltaic panel: first, remove the attachments (aluminum frame and adhesive tape, etc.) of the waste photovoltaic panel; then use high-pressure water to remove impurities and dust adsorbed on the surface of the photovoltaic panel; after natural air drying, use a hammer crusher to crush the waste photovoltaic panel into pieces with a particle size of ≤25mm; then put the blocky waste photovoltaic panel into a jaw crusher to be crushed into waste photovoltaic panel particles with a particle size of ≤2mm for standby; S4, pretreatment of vanadium-titanium ore slag: first, use a hydrocyclone to screen the vanadium-titanium ore slag to maintain a slurry concentration of 32%, obtaining vanadium-titanium ore slag particles with a particle size of ≤0.109mm, a particle size of 0.109~0.212mm, a particle size of 0.212~0.380mm and a particle size of ≥0.380mm; the four kinds of particles are respectively placed in a 105℃ electric heat air drying oven to dry to constant weight for standby; the vanadium-titanium ore slag particles with a particle size of ≤0.109mm and a particle size of ≥0.380mm after drying are placed in a cement ball mill to be ground into vanadium-titanium ore slag powder with a specific surface area of 250 m 2 / kg for standby; S5, pretreatment of stainless steel slag and waste incineration fly ash: first, the stainless steel slag, waste incineration fly ash is screened by using the vibrating screen to separate the particles with particle size ≤2mm and the particles with particle size >2mm; then the particles with particle size >2mm are put into the jaw crusher to be crushed to particles with particle size ≤2mm, and then mixed with the particles with particle size ≤2mm obtained by screening, and placed in a 105℃ electric hot air drying oven to dry to constant weight, to obtain stainless steel slag particles and waste incineration fly ash particles with particle size ≤2mm; the stainless steel slag particles, waste incineration fly ash particles and vanadium-titanium slag powder in S4 are mixed in a planetary ball mill at a mass ratio of 2:1:3 to obtain a particle mixture B with particle size ≤2mm; S6, pretreatment of coal slime and aluminum ash slag: the coal slime is placed in a 105℃ electric hot air drying oven to dry to constant weight, and the dried coal slime is ground by a planetary ball mill to obtain coal slime particles with particle size ≤2mm for standby use; the aluminum ash slag is screened to separate particles with particle size ≤2mm and particles with particle size >2mm, and then the particles with particle size >2mm are put into a jaw crusher to be crushed to particles with particle size ≤2mm, and then mixed with the particles with particle size ≤2mm obtained by screening with a vibrating screen, and placed in a 105℃ electric hot air drying oven to dry to constant weight, to obtain aluminum ash slag particles with particle size ≤2mm; the coal slime particles and aluminum ash slag particles are mixed in a planetary ball mill at a mass ratio of 3:2 to obtain a particle mixture C with particle size ≤2mm; S7, pretreatment of waste wooden furniture: first, the furniture is disassembled, and then sawed into pieces with length <15cm and cross-sectional area <30cm 2 ; then the pieces are placed on a material rack, and the whole material rack is put into a dry distillation kettle, and high-temperature flue gas is used to carbonize the waste wooden pieces in the dry distillation kettle (the temperature of the high-temperature flue gas is 600℃, and the carbonization time is 5h); the carbonized and cooled wooden pieces are taken out from the dry distillation kettle and put into a jaw crusher to be crushed to carbon particles with particle size ≤2mm for standby use; S8, preparation of material cake two: 2mm waste aerated concrete particles in S1, powder one in S2, waste photovoltaic panel particles in S3, particle mixture B in S5, and particle mixture C in S6 are mixed at a mass ratio of 13%:67%:8%:8%:4% to obtain a mixture D; then carbon particles in S7 are added to the obtained mixture D, wherein the carbon particles account for 7% of the total mass of the mixture D, and then put into a cement ball mill to grind to a powder five with specific surface area of 350m 2 / kg; then the powder five is put into a cement mortar mixer and stirred for 80s, and then 9% of water based on the mass of the powder five is added and stirred for 110s; after uniform mixing, the mixture is placed in a mold and pressed into a material cake two (the thickness of the material cake two is 2cm and the diameter is 7cm) by a hydraulic press, and the material cake two is placed in an electric hot air drying oven and dried for 25min (the drying temperature is 100℃); S9, preparation of powder two: put the cake two into a covered corundum crucible, and then place the crucible in a muffle furnace for high temperature calcination (calcination system: from room temperature to 300°C at a rate of 3°C / min, and then keep for 25 min; then from 300°C to 1150°C at a rate of 10°C / min, and then keep for 35 min), and then quickly cool by air after calcination to obtain a high temperature calcination product, and then crush to a particle size of ≤2 mm low carbon particles by a jaw crusher, and then put into a cement ball mill to grind to a specific surface area of 450 m 2 / kg, to obtain powder two; S10, preparation of powder three: first, screen out impurities in lithium slag and citric acid gypsum by using a vibrating screen, and then dry to constant weight in a 105°C electric hot air drying oven, and then put the dried lithium slag and citric acid gypsum into a planetary ball mill according to a mass ratio of 1:2 to mix uniformly, to obtain powder three for standby use; S11, preparation of powder four: add the combination of waste aerated concrete powder in S1, powder one in S2, vanadium-titanium ore slag powder in S4, powder three in S10, fly ash and silica fume to a superfine grinding machine, and then add a water reducing agent, and grind to obtain powder four with a specific surface area of 1400 m 2 / kg, wherein the mass ratio of waste aerated concrete powder, powder one, vanadium-titanium ore slag powder, powder three, fly ash and silica fume is 8%:15%:25%:9%:23%:20%, and the water reducing agent accounts for 4% of the total mass of the combined powder one; S12, preparation of cotton straw fibers: first, separate the core material from the skin of the cotton straw raw material, and remove the peach, leaves and twigs to obtain a core material with a diameter of 5-15 mm, and then cut the cotton straw core material to a length of 150-250 mm and dry it in a 70°C air drying oven until the moisture content is less than or equal to 10%; then put the cotton straw into a rubbing machine for crushing, and then screen to obtain cotton straw fragments with a diameter of 25-60 mm; and then put the cotton straw fragments into a disc mill for disc milling (disc milling gap is 0.3-0.4 mm) to obtain cotton straw fibers with a diameter of 48 um and a length of 15 mm; S13, preparation of UHPC: firstly, dry mixing of the mixture of fine aggregate and coarse aggregate of the first mixture of powder, the second mixture of powder, the fourth mixture of powder and coarse sand in a cement mortar mixer for 240 s, wherein the mass percentage of the second mixture of powder, the fourth mixture of powder and coarse sand is 38%:12%:50%; then, the water is equally divided into three parts, and each part is mixed with defoaming agent, retarder and high-performance expansive agent respectively, and after being fully dissolved, two parts of the solution are sprinkled on the first mixture of dry powder, and stirred for 180 s until the first mixture of dry powder becomes a dough-like state, and then the remaining one part of the solution is added and stirred for 180 s to make the slurry reach a viscous flow state, wherein the dosages of water, defoaming agent, retarder and expansive agent are 19%, 0.87‰, 0.49‰ and 2.4‰ of the total amount of powder respectively; then, the fibers are slowly added to the stirring mixer within 350 s, and after the addition of the fibers is completed, the UHPC is obtained by stirring for 240 s, wherein the fibers include steel fibers and polypropylene fibers, and the volume of the steel fibers and the polypropylene fibers accounts for 2.1 vol.% and 0.2 vol.% of the total volume of the UHPC respectively (the UHPC is poured into a mold and vibrated with a vibration table, and after 1 d of standard curing, the mold is removed and immediately placed in a steam curing room at a temperature of 85℃ for 3 d to obtain a UHPC fireproof plate); S14, preparation of foam concrete: firstly, the dry material, 2mm waste hard polyurethane particles and cotton straw fibers are mixed uniformly in a cement mortar mixer, wherein the dry material is the 2mm waste aerated concrete particles in S1, the second mixture of powder in S9 and the fourth mixture of powder in S11, and the mass percentage of the waste aerated concrete particles, the second mixture of powder and the fourth mixture of powder is 8%:48%:44%, the addition amount of the hard polyurethane particles is 0.18% of the total mass of the second mixture of powder and the fourth mixture of powder, and the addition amount of the cotton straw fibers is 0.2 vol.% of the total volume of the foam concrete; then, 55℃ warm water and 8‰ stabilizing agent with a water material ratio of 0.66 are added, and stirred for 90 s, and then 0.6‰ aluminum powder of the total mass of the dry material is added and stirred for 40 s to obtain the foam concrete (the temperature of the foam concrete when pouring into the mold is ensured to be 47℃, and after pouring into the mold, the mold is statically cured at a temperature of 55℃ for 9 h, and then the mold is removed after 2 d of standard curing, and immediately placed in a steam curing room at a temperature of 85℃ for 3 d to obtain a foam concrete plate).

[0057] The mass percentage of coarse sand and fine sand in the coarse and fine sand is 1.5:1, the mass percentage of vanadium-titanium mine slag particles with a particle size of 0.109-0.212 mm and quartz sand fine sand in the fine sand is 1:2, and the mass percentage of vanadium-titanium mine slag particles with a particle size of 0.212-0.380 mm and quartz sand fine sand in the coarse sand is 1:3. The amount of the two kinds of steel fibers is 1:1 by mass percentage. The corresponding proportion of trinitrotoluene, distilled water and sodium stearoyl lactylate in the foam stabilizer is 7%:90%:3%. In S2 and S8, the pressure for compression molding is 20 MPa, the dispersion time of the planetary ball mill in S5, S6 and S10 is 17 min, and the cooling in S9 includes: first cooling to 1000°C at a wind speed of 19°C / min, and then cooling to room temperature.

[0058] The mixed industrial by-product gypsum prepared according to S10 meets the technical index requirements specified in GB / T 21371-2019 “Industrial By-Product Gypsum for Use in Cement”. The sum of CaSO4·2H2O and CaSO4 in the mixed industrial by-product gypsum is 82% (the specification requires ≥75%), the chloride ion content is 0.44% (the specification requires ≤0.5%), the pH value is 4.0 (the specification requires ≤5), and the radioactive material limit value meets the requirements in GB 6566 (internal radiation index ≤1.0, external radiation index ≤1.0).

[0059] In Example 2, the physicochemical properties of powder one in step S2 (see Table 7), the chemical composition analysis and activity index of low-carbon powder two in step S9 (see Tables 8 and 9), the radioactivity results of powder four in step S11 (see Table 10), the performance indicators of UHPC plates in step S13 (see Table 11), and the performance indicators of foam concrete plates in S14 (see Table 12).

[0060] Table 7 Physicochemical properties of powder one in S2 of Example 2

[0061] Note: The technical indicators are those of “Quicklime for Silicate Building Products” JC / T 621-2021.

[0062] Table 8 Chemical composition of low-carbon powder two in S9 of Example 2

[0063] Table 9 Activity index of low-carbon powder two in S9 of Example 2

[0064] Note: The test method is that of “Method for Testing Strength of Cement Mortar (ISO Method)” GB / T 17671-2021.

[0065] Table 10 Example 2 - Results of radioactive test of dry material in S11

[0066] Note: * is the test index requirement in "Limit of Radionuclide in Building Materials" GB 6566-2010.

[0067] Table 11 Example 2 - Performance index of UHPC plate in S13

[0068] Note: * is "Technical Requirements for Ultra High Performance Concrete (UHPC)" T / CECS 10107-2020; ** is "UHPC" GB / T 31387-2025; *** is "Classification of Building Materials and Products for Combustion Performance" GB 8624-2012.

[0069] Table 12 Example 2 - Performance index of foam concrete plate in S14

[0070] Note: * is the test index requirement in "Foam Concrete" JG / T 266-2011.

[0071] Example 3 The preparation of the UHPC plate and the foam concrete plate includes the following steps: S1, pretreatment of waste aerated concrete: first, the waste aerated concrete is screened by a vibrating screen to screen out bricks and organic matter and other impurities; then the large pieces of waste aerated concrete are sawed into blocky bodies with a length of less than 25 cm, a thickness of less than 6 cm, and a width of less than 12 cm by using a woodworking saw; then the blocky waste aerated concrete is put into a jaw crusher to be crushed into 3 mm waste aerated concrete particles, and then the waste aerated concrete particles are placed into a 105°C electric heat air drying oven to be dried to constant weight; part of the dried waste aerated concrete particles are put into a cement ball mill to be ground into waste aerated concrete powder with a specific surface area of 300 m 2 / kg for standby; S2, pretreatment of silicon calcium slag and marble processing tailings: first, the silicon calcium slag, marble processing tailings are placed in 105℃ electric heating drying oven to dry to constant weight, the dried silicon calcium slag, marble processing tailings are mixed in a mass ratio of 4:3 to obtain material A, the material A is put into the cement mortar mixer, stirred for 90s, then 10% of the mass of material A is added after stirring for 120s; after mixing evenly, the mixture is put into the mold, and the material cake one (the material cake thickness is 3cm, and the diameter is 8cm) is pressed by the hydraulic pressure machine, and the material cake one is placed in the electric heating drying oven for drying for 30min (the drying temperature is 100℃); the dried material cake one is put into the covered corundum crucible, and the crucible is placed in the muffle furnace for high temperature calcination (the calcination system is: from room temperature to 200℃, the heating rate is 4℃ / min, then the temperature is kept for 30min; then from 200℃ to the required temperature 850℃, the heating rate is 5℃ / min, then the temperature is kept for 50min), after calcination, the material cake one is rapidly cooled by air, and then the cooled material cake one is put into the cement ball mill for grinding to a specific surface area of 500m 2 / kg, to obtain the powder one; S3, pretreatment of waste photovoltaic panel: first, the attached objects (aluminum frame and adhesive tape, etc.) of the waste photovoltaic panel are removed, then the impurities and dust adsorbed on the surface of the photovoltaic panel are removed by high-pressure water, and after natural air drying, the waste photovoltaic panel is broken into pieces with a particle size of ≤25mm by using a hammer crusher; then the blocky waste photovoltaic panel is put into a jaw crusher to be broken into waste photovoltaic panel particles with a particle size of ≤2mm for standby use; S4, pretreatment of vanadium-titanium ore slag: first, the vanadium-titanium ore slag is screened by a hydrocyclone, and the concentration of the slurry is kept at 40%, to obtain vanadium-titanium ore slag particles with a particle size of ≤0.109mm, a particle size of 0.109~0.212mm, a particle size of 0.212~0.380mm and a particle size of ≥0.380mm; the four kinds of particles are placed in a 105℃ electric heating drying oven to dry to constant weight for standby use; the vanadium-titanium ore slag particles with a particle size of ≤0.109mm and a particle size of ≥0.380mm are put into a cement ball mill to be ground into vanadium-titanium ore slag powder with a specific surface area of 300m 2 / kg for standby use; S5, pretreatment of stainless steel slag and waste incineration fly ash: first, the stainless steel slag and the waste incineration fly ash are screened by using a vibrating screen to obtain particles with a particle size of ≤2mm and particles with a particle size of >2mm; then the particles with a particle size of >2mm are put into a jaw crusher to be broken into particles with a particle size of ≤2mm, and then the particles with a particle size of ≤2mm obtained by screening are mixed with the particles with a particle size of ≤2mm to be placed in a 105℃ electric heating drying oven to dry to constant weight, to obtain stainless steel slag particles and waste incineration fly ash particles with a particle size of ≤2mm; the stainless steel slag particles, the waste incineration fly ash particles and the vanadium-titanium ore slag powder in S4 are put into a planetary ball mill in a mass ratio of 3:1:4 to be mixed uniformly, to obtain particle mixture B with a particle size of ≤2mm; S6, pretreatment of coal slime and aluminum ash: the coal slime was placed in a 105°C electric hot air drying oven to dry to constant weight, and the dried coal slime was ground by a planetary ball mill to obtain coal slime particles with a particle size of ≤2 mm for standby; the aluminum ash was sieved to obtain particles with a particle size of ≤2 mm and particles with a particle size of >2 mm, and then the particles with a particle size of >2 mm were put into a jaw crusher to be broken to particles with a particle size of ≤2 mm, and then mixed with the particles with a particle size of ≤2 mm sieved by a vibrating screen, and placed in a 105°C electric hot air drying oven to dry to constant weight, to obtain aluminum ash particles with a particle size of ≤2 mm; the coal slime particles and the aluminum ash particles were put into a planetary ball mill in a mass ratio of 4:3 and ball-mixed to obtain a particle mixture C with a particle size of ≤2 mm; S7, pretreatment of waste wooden furniture: first, the furniture was disassembled, and then sawed into pieces with a length of <15 cm and a cross-sectional area of <30 cm 2 , and then the pieces were placed on a material rack, and the whole material rack was put into a dry distillation kettle, and the waste wooden pieces in the dry distillation kettle were carbonized by high-temperature flue gas (the temperature of the high-temperature flue gas was 700°C, and the carbonization time was 6h); the carbonized and cooled wooden pieces were taken out from the dry distillation kettle and put into a jaw crusher to be broken to carbon particles with a particle size of ≤2 mm for standby; S8, preparation of the second material cake: 3 mm waste aerated concrete particles in S1, powder I in S2, waste photovoltaic panel particles in S3, particle mixture B in S5, and particle mixture C in S6 were mixed in a mass ratio of 15%:60%:10%:10%:5% to obtain a mixed material D; then carbon particles in S7 were added to the obtained mixed material D, wherein the carbon particles accounted for 8% of the total mass of the mixed material D, and then put into a cement ball mill to be ground to a powder V with a specific surface area of 400 m 2 / kg; then the powder V was put into a cement mortar mixer and stirred for 90 s, and then 10% of water based on the mass of the powder V was added and stirred for 120 s; after uniform mixing, the mixed material was placed in a mold and pressed into a second material cake (the thickness of the second material cake was 3 cm, and the diameter was 8 cm) by a hydraulic press, and the second material cake was placed in an electric hot air drying oven and dried for 30 min (the drying temperature was 100°C); S9, preparation of the second powder: the second material cake was put into a covered corundum crucible, and then the crucible was placed in a muffle furnace for high-temperature calcination (calcination system: from room temperature to 300°C at a heating rate of 3°C / min, then kept for 30 min; then from 300°C to 1200°C at a heating rate of 10°C / min, then kept for 40 min), and after calcination, the high-temperature calcination product was quickly cooled by air, and then broken by a jaw crusher to low-carbon particles with a particle size of ≤2 mm, and then put into a cement ball mill to be ground to a second powder with a specific surface area of 500 m 2 / kg; S10, preparation of the third powder: first, the impurities in the lithium slag and citric acid gypsum are removed by using a vibrating screen, and then the lithium slag and citric acid gypsum are dried to constant weight in a 105°C electric hot air drying oven, and then the dried lithium slag and citric acid gypsum are put into a planetary ball mill in a mass ratio of 1:3 to mix uniformly, to obtain the third powder for standby; S11, preparation of the fourth powder: the combination of the waste aerated concrete powder in S1, the first powder in S2, the vanadium-titanium slag powder in S4, the third powder in S10, fly ash and silica fume is added into a superfine grinding machine, and then a water reducing agent is added, and the combination is ground to obtain the fourth powder with a specific surface area of 1500 m 2 S12, preparation of the cotton straw fiber: first, the cotton straw raw material is subjected to core-shell separation and the peach, leaves and twigs are removed to obtain core material with a diameter of 5-15 mm, and the cotton straw core material with a length of 150-250 mm is placed in a 70°C air drying oven to dry to a moisture content of less than or equal to 10%; then the cotton straw is put into a rubbing machine for crushing, and then the cotton straw fragments with a diameter of 25-60 mm are obtained by screening; then the cotton straw fragments are put into a disc mill for disc milling (disc milling gap is 0.3-0.4 mm) to obtain cotton straw fibers with a diameter of 65 um and a length of 25 mm; S13, preparation of UHPC: first, the mixed dry material one of the powder and coarse and fine aggregate is put into a cement mortar mixer for dry mixing for 260s, and the powder and coarse and fine aggregate are the second powder, the fourth powder and coarse and fine sand, and the mass percentage of the second powder, the fourth powder and coarse and fine sand is 32%:10%:58%; then the water is divided into three equal parts, and each part is mixed with defoaming agent, retarder and high-performance expansive agent, and after being fully dissolved, two parts of the solution are sprinkled on the mixed dry material one, and stirred for 200s until the mixed dry material one becomes like a dough, and then the remaining one part of the solution is added, and stirred for another 200s to make the slurry reach a viscous flow state, wherein the amount of water, defoaming agent, retarder and expansive agent is 20%, 0.96‰, 0.58‰ and 2.9‰ of the total amount of powder respectively; then the fibers are slowly added to the stirring mixer within 380s, and after the addition of the fibers is completed, the mixer is stirred for another 260s to obtain UHPC, and the fibers contain steel fibers and polypropylene fibers, and the volume of the steel fibers and polypropylene fibers accounts for 2.3 vol.% and 0.4 vol.% of the total volume of UHPC respectively (the UHPC is poured into a mold and vibrated with a vibration table, and after 1d of standard curing, the mold is removed and immediately placed in a steam curing room at a temperature of 90°C for 3d to obtain a UHPC fireproof plate); ​S14, Preparation of foam concrete: first, the dry materials, 3mm waste hard polyurethane particles and cotton straw fibers are put into the cement mortar mixer and mixed uniformly, the dry materials are 3mm waste aerated concrete particles in S1, powder two in S9 and powder four in S11, the mass percentage of waste aerated concrete particles, powder two and powder four is 10%:35%:55%, the addition amount of hard polyurethane particles is 0.25% of the total mass of powder two and powder four, the addition amount of cotton straw fibers is 0.3vol.% of the total volume of foam concrete; then 60 ℃ warm water and 11‰ total water amount of foam stabilizer are added according to the water material ratio of 0.75, stirred for 100s, then 0.7‰ of the total mass of aluminum powder is added, stirred for 50s, to obtain foam concrete (ensure that the mold temperature of foam concrete pouring is 50℃, after pouring into the mold, it is static and steamed for 10h at a temperature of 60℃, then standard curing for 2d, and then demoulding, immediately put into the steam curing room at a temperature of 90℃ for curing for 3d, to obtain foam concrete board).

[0072] The mass percentage of coarse sand and fine sand in coarse and fine sand is 2:1, the mass percentage of vanadium-titanium mine slag particles with a particle size of 0.109-0.212mm and quartz sand fine sand in fine sand is 1:3, and the mass percentage of vanadium-titanium mine slag particles with a particle size of 0.212-0.380mm and quartz sand fine sand in coarse sand is 1:4. The two steel fibers are used in an amount of 1:1 by mass percentage. The corresponding proportion of trinitrobenzene, distilled water and sodium stearoyl lactate in the foam stabilizer is 9.5%:86%:4.5%. In S2 and S8, the pressure for pressing into shape is 25 MPa, in S5, S6 and S10, the dispersion time of the planetary ball mill is 20min, and in S9, the cooling includes: first cooling to 1000℃ at a wind speed of 20℃ / min, and then cooling to room temperature.

[0073] The powder three prepared according to step S10, and the 1:3 mixed lithium slag and citric acid gypsum meet the technical index requirements specified in GB / T 21371-2019 “Industrial By-product Gypsum for Use in Cement”. The total amount of CaSO4·2H2O and CaSO4 in the mixed industrial by-product gypsum is 85% (the specification requires ≥75%), the chloride ion content is 0.40% (the specification requires ≤0.5%), the pH value is 3.8 (the specification requires ≤5), and the radioactive material limit value meets the requirements in GB 6566 (internal radiation index ≤1.0, external radiation index ≤1.0).

[0074] In Example 3, the physicochemical properties of the powder one in S2 (see Table 13), the chemical composition analysis and activity index of the low-carbon powder two in step S9 (see Tables 14 and 15), the radioactivity results of the powder four in step S11 (see Table 16), the performance indicators of the UHPC board in step S13 (see Table 17), and the performance indicators of the foam concrete board in S14 (see Table 18).

[0075] Table 13 Physico-chemical properties of powder 1 in Example 3-S2

[0076] Note: The technical indicators are those of Quicklime for Silicate Building Products JC / T 621-2021.

[0077] Table 14 Chemical composition of low-carbon powder 2 in Example 3-S9

[0078] Table 15 Activity index of low-carbon powder 2 in Example 3-S9

[0079] Note: * is the test method of Method for Testing Strength of Cement Mortar (ISO Method) GB / T 17671-2021.

[0080] Table 16 Radioactivity test results of dry material in Example 3-S11

[0081] Note: * is the test index requirement in Limit of Radionuclides in Building Materials GB 6566-2010.

[0082] Table 17 Performance indicators of UHPC plate in Example 3-S13

[0083] Note: * is Technical Requirements for Ultra High Performance Concrete (UHPC) T / CECS 10107-2020; ** is UHPC GB / T 31387-2025; *** is Classification of Combustible Performance of Building Materials and Products GB 8624-2012.

[0084] Table 18 Performance indicators of foam concrete plate in Example 3-S14

[0085] Note: * is the test index requirement in Foam Concrete JG / T 266-2011.

[0086] Figure 7 The appearance of the UHPC test piece under room temperature conditions and after heating under different high temperature conditions is shown in the physical photographs. For the ordinary UHPC test piece, it mainly presents a dark gray color similar to cement paste at room temperature, as shown in Figure 7 (a); with the increase of temperature, the free water, adsorbed water and bound water in the paste evaporate continuously, causing the color of the test piece to gradually lighten, as shown in Figure 7(b) and (c) of Figure 7. In addition, when the temperature reached 600 ℃, the test piece had partial non-explosive spalling, which damaged the integrity of the test piece, as shown in (d) of Figure 7; when the temperature rose to 800 ℃, the test piece had serious explosive spalling, which completely lost the load-carrying capacity of the test piece, and was broken into multiple pieces of different sizes, as shown in (e) of Figure 7. Figure 7 (b) and (c) of Figure 7. In addition, when the temperature reached 600 ℃, the test piece had partial non-explosive spalling, which damaged the integrity of the test piece, as shown in (d) of Figure 7; when the temperature rose to 800 ℃, the test piece had serious explosive spalling, which completely lost the load-carrying capacity of the test piece, and was broken into multiple pieces of different sizes, as shown in (e) of Figure 7. Figure 7 (e). The spalling damage of the concrete structure at high temperature is one of the main forms of high-temperature damage, and the microstructure of UHPC is more compact than that of ordinary concrete, so it is more prone to explosive spalling.

[0087] At room temperature, the appearance of the UHPC test piece prepared in Example 2 of the present application is basically the same as that of ordinary UHPC. For the UHPC test piece added with composite fibers (steel fibers, polypropylene fibers 2.1 vol.%, 0.2 vol.%), the heat-triggered polymer fibers (blue outline) can be observed scattered and distributed on the outer surface of the test piece. When the temperature rises to 200 ℃, the melting of the polypropylene matrix in the heat-triggered polymer fiber causes some through fiber channels (blue outline) to appear on the surface of the test piece. As the temperature increases to 400 ℃, the expansion-type flame retardant in the heat-triggered polymer fiber will have a violent foaming reaction, and the foaming product thereof can overflow to the surface of the test piece along the through channel (yellow outline). When the temperature reaches 600 ℃ or above, the carbonization process of the foaming flame retardant product causes a local black thermal insulation layer (pink outline) to appear on the outer surface of the self-fire-resistant UHPC test piece. In addition, under different types and amounts of heat-triggered polymer fibers, the explosive spalling of the UHPC test piece can be effectively prevented,

[0088] Figure 8 XRD patterns of the foam concrete prepared in Example 2 of the present application are given. FW-1 is the XRD pattern of the neat paste after 1 day of curing, and FW-2, FW-3, and FW-4 are the XRD patterns of the foam concrete neat paste after 3 days, 7 days, and 28 days of standard curing, respectively. Comparing the patterns of the four different curing ages, it can be seen that there are obvious changes in the characteristic diffraction peaks, which indicates that with the increase of curing time and the progress of hydration reaction, the mineral composition of the foam concrete has changed significantly. In Figure FW-1, there are obvious gypsum diffraction peaks at about 12°, 21°, and 24°, but with the increase of curing time, the diffraction peaks of the gypsum crystal gradually disappear, and at the same time, the diffraction peaks of the calcium vanadate crystal gradually appear in the diffraction peaks of FW-2, FW-3, and FW-4, and the peak value increases with the increase of curing time. This indicates that in the process of curing, the gypsum is continuously dissolved and consumed, and the Ca 2+ , SO4 2- ions released by the dissolution of the gypsum and the OH - , AlO 2-The ion generation reaction generates sulphoaluminate (ettringite), which gradually forms in the early curing stage of the product, provides strength support for the early product, and increases the late strength as the number increases. Moreover, in the four curves, the diffraction peak of CaCO3 is in several stages, because a large amount of Ca(OH)2 is generated in the hydration process of powder two and powder four, and carbonation is generated with CO2 in the air.

[0089] Figure 9 SEM images of the pore wall section of the different age foam concrete (prepared according to the method described in Example 2 of the present application), Figure 9 In the figures, a1, b1, c1 are 3000 times SEM photos of the outer surface of the pore wall of the product, and a2, b2, c2 are 10000 times SEM photos of the corresponding A, B, C areas of the outer surface of the pore wall of the product. It can be seen from the figures that the outer surface of the pore wall of the foam concrete product has enough space for crystal growth, so as the curing time increases, more and more crystals grow, and the crystal morphology becomes more and more regular. In the 3000 times SEM photos, the general morphological characteristics of the outer surface of the pore wall of the product at different curing times can be seen. The surface of the product cured for 1 day is dispersedly distributed with flocculent aggregates, which are speculated to be gel-like C-S-H and rod-shaped ettringite aggregates (the analysis results are consistent with the XRD analysis results). In the product cured for 3 days, the flocculent aggregates gradually increase, and in the product cured for 28 days, the rod-shaped crystals grow along the section, the length increases, and the concentrated dry rod-shaped crystals basically cover the outer surface of the pore wall, forming a crystal intergrowth body, which enhances the strength of the pore wall. In the 10000 times SEM photos (a2), (b2), (c2), the morphological changes of the aggregates can be clearly seen. In the product cured for 1 day, the aggregates are dispersedly present on the pore wall surface, and the rod-shaped crystals adhere to the gel surface; in the product cured for 3 days, the aggregates increase and almost cover the entire pore wall surface; in the product cured for 28 days, the rod-shaped crystals in the aggregates grow longitudinally, the gel-like substances gradually decrease, and the rod-shaped crystals become more prominent, showing an interpenetrating structure. It is believed that the internal section of the pore wall of the foam concrete product is insufficient for crystal growth, and most of the crystals grow towards the capillary pores, which greatly improves the density of the pore wall structure and enhances the ability of the pore wall to withstand external pressure. Therefore, the compressive strength of the product is also enhanced.

[0090] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for the preparation of construction material based on multi-source solid waste, characterized by, Preparation of the UHPC S1, pretreatment of waste aerated concrete: the waste aerated concrete is sequentially screened, sawed, crushed, and dried to obtain waste aerated concrete particles with a particle size of 1-3 mm, and a part of the dried waste aerated concrete particles is ground by a ball mill to obtain waste aerated concrete powder with a specific surface area of 200-300 m 2 / kg for standby use; S2, preparation of a slurry: the waste aerated concrete powder obtained in S1 is mixed with water to prepare a slurry; S2, pretreatment of the silicon-calcium slag and marble processing tailing: first, the dried silicon-calcium slag and marble processing tailing are mixed in a mass ratio of 2-4:1-3 to obtain material A, the material A is subjected to dry stirring, water stirring, molding and pressing to obtain a material cake one, the material cake one is subjected to drying, high-temperature calcination, cooling and ball milling to obtain a powder one with a specific surface area of 400-500 m 2 / kg. S3, pretreatment of waste photovoltaic panel: the waste photovoltaic panel is crushed to waste photovoltaic panel particles with a particle size of ≤2 mm for standby; S4, pretreatment of vanadium-titanium ore slag: the vanadium-titanium ore slag is screened to obtain vanadium-titanium ore slag particles with particle size ≤0.109 mm, particle size of 0.109~0.212 mm, particle size of 0.212~0.380 mm and particle size ≥0.380 mm, and the four kinds of vanadium-titanium ore slag particles are dried to constant weight for standby, and the dried vanadium-titanium ore slag particles with particle size ≤0.109 mm and particle size ≥0.380 mm are ball milled to obtain vanadium-titanium ore slag powder with specific surface area of 200~300 m 2 / kg vanadium-titanium ore slag powder for standby; S5, preparation of vanadium-titanium ore slag-based composite binder: the vanadium-titanium ore slag powder prepared in S4 is mixed with a binder to obtain a vanadium-titanium ore slag-based composite binder, and the vanadium-titanium ore slag-based composite binder is used for preparing the vanadium-titanium ore slag-based composite binder-based building material in S6. S6, preparation of vanadium-titanium ore slag-based composite binder-based building material: the vanadium-titanium ore slag-based composite binder prepared in S5 is mixed with a binder to obtain a vanadium-titanium ore slag-based composite binder-based building material, and the vanadium-titanium ore slag-based composite binder-based building material is used for preparing S5, pretreatment of stainless steel slag and waste incineration fly ash: the stainless steel slag and waste incineration fly ash are respectively screened, crushed and dried to obtain stainless steel slag particles and waste incineration fly ash particles with a particle size of ≤2 mm, the stainless steel slag particles, the waste incineration fly ash particles and the vanadium-titanium slag powder in S4 are mixed in a planetary ball mill at a mass ratio of 1-3:1:2-4 to obtain particle mixture B with a particle size of ≤2 mm; S6, pretreatment of coal slime and aluminum ash slag: the coal slime is dried and ball milled to obtain coal slime particles with a particle size of ≤2 mm, the aluminum ash slag is screened, crushed and dried to obtain aluminum ash slag particles with a particle size of ≤2 mm, and the coal slime particles and the aluminum ash slag particles are mixed in a planetary ball mill at a mass ratio of 2-4:1-3 to obtain particle mixture C with a particle size of ≤2 mm; S7, pretreatment of waste wooden furniture: the waste wooden furniture is disassembled, sawed, carbonized and crushed to obtain carbon particles with a particle size of ≤2 mm for standby; S8, preparation of the second material cake: 1-3 mm waste aerated concrete particles in S1, powder one in S2, waste photovoltaic panel particles in S3, particle mixture B in S5, particle mixture C in S6 are mixed in a mass ratio of 10-15%:60-77%:5-10%:5-10%:3-5% to obtain mixed material D, then carbon particles in S7 are added to mixed material D, the carbon particles account for 5-8% of the total mass of mixed material D, and then ball milling is performed to obtain powder five with a surface area of 300-400 m 2 / kg, the powder five is dry mixed, water mixed, molded, pressed, and dried to obtain the second material cake; S9, preparation of the second powder: the cake II is calcined at high temperature, cooled, and crushed to obtain low-carbon particles with a particle size of ≤2 mm, and the low-carbon particles are ball milled to obtain the second powder with a specific surface area of 400-500 m 2 / kg. S10, preparation of powder three: the lithium slag and the citric acid gypsum screened of impurities are dried and ball milled to obtain powder three, wherein the mass ratio of the lithium slag to the citric acid gypsum is 1:1-3; S11, preparation of the fourth combined powder: the waste aerated concrete powder in S1, the first combined powder in S2, the vanadium-titanium ore slag powder in S4, the third combined powder in S10, fly ash and silica fume are added into a superfine grinding mill, and a water reducing agent is further added, and then grinding is performed to obtain the fourth combined powder with a specific surface area of 1300-1500 m 2 / kg, wherein the mass ratio of the waste aerated concrete powder, the first combined powder, the vanadium-titanium ore slag powder, the third combined powder, the fly ash and the silica fume is 6-10%:13-18%:24-28%:7-11%:21-26%:12-29%, and the water reducing agent accounts for 3-5% of the total mass of the first combined powder. S12, preparation of cotton straw fibers: first, the cotton straw raw material is subjected to skin-core separation and removal of peaches, leaves and twigs to obtain core material with a diameter of 5-15 mm, and cotton straw core material with a length of 150-250 mm is cut and dried in a 70℃ air-drying oven to a moisture content of ≤10%; then the cotton straw is crushed, screened and disc milled to obtain cotton straw fibers with a diameter of 30-65 um and a length of 5-25 mm; S13, preparation of UHPC: first, the mixed dry material one of the powder and the coarse and fine aggregate is dry-mixed in a cement mortar mixer for 220-260 s, the powder is powder two and powder four, and the coarse and fine aggregate is coarse and fine sand, wherein the mass percentage of powder two, powder four and coarse and fine sand is 32-40%:10-15%:45-58%; then water is divided into three equal parts and mixed with defoaming agent, retarder and high-performance expanding agent respectively, after being fully dissolved, two parts of the solution are sprinkled on the mixed dry material one, and stirred for 160-200 s until the mixed dry material one becomes a dough-like state, and then the remaining one part of the solution is added and stirred for another 160-200 s to make the slurry reach a viscous flow state, wherein the amount of water, defoaming agent, retarder and expanding agent accounts for 18-20%, 0.77-0.96‰, 0.38-0.58‰ and 1.5-2.9‰ of the total mass of the powder respectively; then the fibers are slowly added to the stirring mixer within 330-380 s, and after the addition of the fibers is completed, the UHPC is obtained by stirring for another 220-260 s, the fibers contain steel fibers and polypropylene fibers, and the volume of the steel fibers and the polypropylene fibers accounts for 1.7-2.3 vol.% and 0.1-0.4 vol.% of the total volume of the UHPC respectively; S14, preparation of foamed concrete: first, the dry material, 1-3 mm waste hard polyurethane particles and cotton straw fiber are put into the cement mortar mixer to mix evenly, the dry material is 1-3 mm waste aerated concrete particles in S1, powder two in S9 and powder four in S11, wherein the mass percentage of waste aerated concrete particles, powder two and powder four is 5-10%:35-60%:35-55%, the addition amount of hard polyurethane particles is 0.1-0.25% of the total mass of powder two and powder four, and the addition amount of cotton straw fiber is 0.1-0.3 vol.% of the total volume of foamed concrete; then 50-60 ℃ warm water and 5-11‰ total water amount of foam stabilizer are added according to the water material ratio of 0.5-0.75, stirred for 80-100 s, then 0.5-0.7‰ aluminum powder of the total mass of dry material is added, stirred for 30-50 s, and foamed concrete is obtained.

2. A method for preparing a building material based on multi-source solid waste according to claim 1, characterized in that, The main chemical components and contents of the waste aerated concrete in S1 are: SiO240-60%, Al2O33-8%, CaO 20-30%, MgO 1-5%, Fe2O31-5%, SO3 1-5%, K2O+Na2O 0.1-2%, and the loss on ignition of the waste aerated concrete is 5-15%; the main chemical components and contents of the silicon-calcium slag in S2 are: CaO 42-52%, SiO2 18-36%, Al2O3 6-19%, Fe2O3 1-5%, MgO 1-5%, and the loss on ignition of the silicon-calcium slag is 15-30%; the main chemical components and contents of the marble processing tailings in S2 are: CaO 50-62%, SiO2 0.1-5%, Al2O3 0.1-3%, Fe2O3 0.1-2%, MgO 0.01-3%, K2O+Na2O 0.01-2%, and the loss on ignition of the marble processing tailings is 30-50%; the main chemical components and contents of the waste photovoltaic panel in S3 are: SiO2 60-83%, CaCl2 0.1-5%, NaCl 16-38%, and the loss on ignition of the waste photovoltaic panel is 0.1-8%; the main chemical components and contents of the vanadium-titanium ore slag in S4 are: SiO2 27-33%, CaO 30-35%, Al2O3 8-15%, MgO 8-12%, Fe2O3 5-10%, SO3 0.1-3%, K2O+Na2O 0.1-2%, TiO2 5-10%, and the loss on ignition of the vanadium-titanium ore slag is 0.1-3%; the main chemical components and contents of the stainless steel slag in S5 are: SiO2 27-37%, CaO 40-50%, Al2O3 1-3%, MgO 5-8%, Fe2O3 1-8%, K2O+Na2O 0.01-2%, P2O5 0.1-2%, and the loss on ignition of the stainless steel slag is 1-6%; the main chemical components and contents of the waste incineration fly ash in S5 are: CaO 25-45%, SiO2 1-10%, Al2O3 1-5%, Fe2O3 0.1-5%, MgO 1-8%, FeO 0.01-2%, Na2O 1-7%, K2O 1-7%, Cl 10-30%, and the loss on ignition of the waste incineration fly ash is 0.01-5%; the main chemical components and contents of the coal slime in S6 are: SiO2 35-65%, Al2O3 12-36%, Fe2O3 1-13%, FeO 0.1-6%, MgO 0.1-6%, CaO 1-14%, Na2O 0.01-2%, K2O 0.01-2%, SO3 0.1~4%, the loss on ignition of coal slime is 20~30%, the fixed carbon content is 27~35%, and the calorific value is 1700~3300 kcal / kg; the main chemical components and contents of aluminum ash slag in S6 are as follows: SiO2 6~14%, Al2O3 53~71%, AlN 16~26%, AlCl3 1~6%, AlF3 1~6%, and the loss on ignition of aluminum ash slag is 6~24%; the main chemical elements and contents of waste wooden furniture in S7 are as follows: C 35~55%, H 1~5%, O 30~50%, N 0.01~1%, S 0.01~1.5%, the moisture of waste wooden furniture is 1~5%, the ash content is 2~5%, the volatile matter is 60~85%, and the fixed carbon is 5~11%; the main chemical components and contents of lithium slag in S10 are as follows: CaO 22~30%, SiO2 45~55%, Al2O3 16~22%, SO3 18~23%, Fe2O3 0.1~3%; the main chemical components and contents of citric acid gypsum in S10 are as follows: SO3 30~50%, CaO 20~40%, SiO2 2~5%, P2O5 1~3%, MgO 0.01~2%, Na2O 0.01~1%, Fe2O3 0.01~5%, K2O 0.01~1%, and the loss on ignition of citric acid gypsum is 15~25%; the main chemical components and contents of fly ash in S11 are as follows: SiO2 40~50%, Al2O3 25~35%, CaO 5~12%, Fe2O3 5~8%, MgO 0.1~2%, SO3 2~10%, K2O 0.5~2%, Na2O 0.1~0.5%, and the loss on ignition of fly ash is 3~7%.

3. A method of producing a building material based on multi-source solid waste as claimed in claim 1, wherein, The particle size of silica ash in S11 is 0.1-1 um, the SiO2 content, apparent density, specific surface area and pozzolanic activity index of silica ash are 88.54%, 2.19 g / m 3 , 17800 m 2 / kg, 108% respectively; the water reducing agent in S11 is high-performance polycarboxylic acid powder water reducing agent, and the water reducing rate is >30%.

4. A method of producing a building material based on multi-source solid waste according to claim 1, characterized in that, The cotton straw fiber in S12 contains 15-20% lignin and 30-40% alpha-cellulose, and the main chemical elements and contents of the cotton straw fiber are: C 40-46%, H 5-6%, O 43-50%, N 0.6-1.1%, S 0.1-0.2%, and ash 4.14%.

5. A method of producing a building material based on multi-source solid waste according to claim 1, characterized in that, The coarse and fine sand in S13 includes fine sand with a particle size of 0.212-0.380 mm and coarse sand with a particle size of 0.212-0.380 mm, wherein the mass percentage of fine sand to coarse sand is 1:1-2; the mass percentage of vanadium-titanium slag particles of 0.109-0.212 mm to quartz sand in fine sand is 1:1-3, and the mass percentage of vanadium-titanium slag particles of 0.212-0.380 mm to quartz sand in coarse sand is 1:2-4.

6. A method of producing a building material based on multi-source solid waste according to claim 1, characterized in that, The defoaming agent in S13 uses at least one of tributyl phosphate or silicone defoaming agent, the retarder uses boric acid, and the main chemical composition and content of the high-performance expansive agent are SiO2 5-10%, Al2O3 25-30%, Fe2O3 1-7%, CaO 30-40%, MgO 1-3%, and SO3 18-23%, and the loss on ignition of the high-performance expansive agent is 0.1-1%.

7. A method of producing a building material based on multi-source solid waste according to claim 1, characterized in that, The fiber used in UHPC in S13 is steel fiber and polypropylene fiber, wherein the steel fiber uses two kinds of 0.2 mm in diameter and 13 mm in length, and 0.16 mm in diameter and 6 mm in length, the two kinds of steel fiber are used in a mass percentage of 1:1, the polypropylene fiber is 30 μm in diameter and 19 mm in length; the stirring speed of the cement mortar mixer in the preparation process of UHPC slurry is low speed stirring.

8. A method of producing a building material based on multi-source solid waste according to claim 1, characterized in that, The foam stabilizer in S14 is prepared from trinitrotoluene, distilled water and sodium stearoyl lactylate, and the corresponding proportion of trinitrotoluene, distilled water and sodium stearoyl lactylate is 5-10%:86-94%:1-5%; the active Al content of the aluminum powder in S14 is ≥92%.

9. A method of producing a building material based on multi-source solid waste according to claim 1, characterized in that, In S1, S5, S6, S7 and S9, crushing is carried out by a jaw crusher, wherein the feed size of the jaw crusher is ≤250 mm, and the discharge size is ≤10 mm; in S1, S2, S4, S8 and S9, ball milling is carried out by a cement ball mill, wherein the rotating speed of the cement ball mill is 48 r / min; in S2 and S8, the pressure for pressing into shape is 15-25 MPa; in S2, S8, S13 and S14, low-speed stirring is carried out by a cement mortar stirrer, wherein the rotating speed of the low-speed stirring is: revolution 140±5 r / min, rotation 62±5 r / min, or revolution 285±10 r / min, rotation 125±10 r / min; in S5, S6 and S10, mixing is carried out by a planetary ball mill, wherein the mixing time is 15-20 min, and the rotating speed of the ball mill is 200 r / min; in S9, cooling comprises: firstly, cooling to 1000℃ at a wind speed of 18-20℃ / min, and then cooling to room temperature; in S3, the waste photovoltaic panel is firstly crushed into pieces by a hammer crusher, and then the pieces are crushed into waste photovoltaic panel particles with a particle size of ≤2 mm by a jaw crusher, wherein the feed size of the hammer crusher is ≤450 mm, and the discharge size is ≤25 mm, and the feed size of the jaw crusher is ≤250 mm, and the discharge size is ≤10 mm; in S11, the maximum feed size of the superfine grinding mill is ≤20 mm, and the finished product particle size is 325-2500 meshes.

10. A composite fireproof thermal insulation board, characterized by, The foam concrete slab layer located in the middle layer, both sides of the foam concrete slab layer are provided with UHPC slab layers, and a steel square mesh sheet is arranged between the foam concrete slab layer and the UHPC slab layer, wherein the foam concrete slab layer is cast by the foam concrete prepared in claim 1, and the UHPC slab layer is cast by the UHPC prepared in claim 1.

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