Lightweight foamed glass-ceramics with good sound absorption performance and a preparation method thereof

Abstract

The present application belongs to the field of high-value utilization of solid waste and the field of foamed glass-ceramics, and discloses a light foamed glass-ceramic with good sound absorption performance and a preparation method thereof. The raw materials of the light foamed glass-ceramic include, in mass fraction, 70-80 parts of solid waste combination material, 10-20 parts of pore-forming agent and 5-10 parts of hardening agent. The solid waste combination material includes copper residue tailings and waste glass, wherein the content of the copper residue tailings is 30-40% of the mass of the solid waste combination material, and the balance is waste glass. The pore-forming agent is a mixture of one or more of primary aluminum ash, secondary aluminum ash and electrolytic aluminum residue. The hardening agent includes rare earth oxide and high-titanium blast furnace slag, wherein the content of the rare earth oxide is 30-50% of the mass of the hardening agent, and the balance is high-titanium blast furnace slag. The present application can utilize industrial solid waste to prepare foamed glass-ceramics suitable for sound absorption and noise reduction, the pore-forming agent does not produce harmful gas during foaming, the raw material cost is relatively low, and a large amount of metallurgical industrial solid waste can be utilized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of high-value utilization of solid waste and the field of foamed glass-ceramics, and particularly relates to a lightweight foamed glass-ceramic with good sound absorption performance and a preparation method thereof. BACKGROUND

[0002] A large amount of solid waste is generated in the production of metallurgical industry. It is estimated that more than 2.2-3 tons of copper slag is generated per ton of copper produced; about 30-50 kg and 100-150 kg of secondary aluminum ash is discharged per ton of aluminum in the aluminum electrolysis and recycling processes, respectively. The stacking and landfill of a large amount of waste slag not only wastes land resources, but also threatens the environment and human health. Common treatment methods are generally to use them to produce cement, concrete, filler, ballast and abrasive products, which can reduce environmental hazards to some extent, but it is difficult to generate economic benefits. Foamed glass-ceramic is one of the products for high-value utilization of metallurgical waste slag, which is a lightweight porous material with a crystal matrix, and has many advantages such as high strength, light weight, heat preservation, heat insulation, sound absorption and corrosion resistance.

[0003] CN 109081596 A discloses a porous foamed glass-ceramic brick and a preparation method thereof, taking fly ash, red mud, glass waste and feldspar as main raw materials, carbon powder as foaming agent, and one or more of NaF, Na2SiF4 and borax as fluxing agent. The foamed glass-ceramic prepared by sintering method is cut to obtain a porous foamed glass brick. CN 110372219 A discloses a method for preparing foamed glass-ceramic using granite tailings, taking granite and waste glass as main raw materials, at least one of calcium carbonate, carbon powder, sodium carbonate and starch as foaming agent, at least one of sodium phosphate, sodium sulfate and sodium pyrophosphate as foam stabilizer, and at least one of boric acid, borax, nitrate, barium compound and fluorine compound as fluxing agent. Foamed glass-ceramic is prepared by sintering method. CN 105819695 B discloses a preparation method of cyanide tailings foamed glass-ceramic, taking cyanide tailings as main raw material, and mixing carbon black, CaCO3 and SiC in a certain proportion to form the foaming agent; mixing CaF2, TiO2 and ZrO2 in a certain proportion to form the crystal nucleus agent; mixing Na2B4O7·10H2O, Na2CO3 and MgCO3 in a certain proportion to form the fluxing agent; mixing Na3PO4, NaH2PO4 and Mg3(PO4)2 in a certain proportion to form the foam stabilizer, and foamed glass-ceramic is prepared by sintering method.

[0004] The above-listed sintering process for preparing foam microcrystalline glass has the following disadvantages: low utilization rate of solid waste from the metallurgical industry, which cannot effectively solve the problem of metallurgical waste slag storage; various additives such as foaming agents and nucleating agents need to be added, which increases production costs; the selected foaming agents are carbon, silicon carbide, carbonates, sulfates and other substances, and the gases produced will cause greenhouse effects and air pollution; the prepared foam microcrystalline glass is mostly closed-cell type, and is rarely used in the field of sound absorption. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a lightweight foam microcrystalline glass with good sound absorption performance and a preparation method thereof. The present invention can use industrial solid waste to prepare foam microcrystalline glass suitable for sound absorption and noise reduction. The foaming process of the pore-forming agent does not produce harmful gases, the raw material cost is low, and it can achieve large-scale utilization of solid waste from the metallurgical industry.

[0006] The technical solution adopted in the present invention is as follows:

[0007] A lightweight foam micro-ceramic glass with good sound absorption performance, wherein the raw materials thereof include, by weight: 70 to 80 parts of solid waste composite material, 10 to 20 parts of pore-forming agent, and 5 to 10 parts of hardener;

[0008] The solid waste composite material comprises copper slag tailings and waste glass, wherein the content of copper slag tailings is 30% to 40% of the mass of the solid waste composite material, and the remainder is waste glass;

[0009] The pore-forming agent is one or a mixture of primary aluminum ash, secondary aluminum ash and electrolytic aluminum slag;

[0010] The hardener comprises rare earth oxide and high-titanium blast furnace slag, wherein the content of rare earth oxide is 30% to 50% of the mass of the hardener, and the balance is high-titanium blast furnace slag.

[0011] Preferably, the rare earth oxide is one or a mixture of erbium oxide, lanthanum oxide and yttrium oxide.

[0012] Preferably, the particle size of the solid waste combination material, pore former and hardener is above 200 mesh.

[0013] Preferably, in terms of mass percentage, the copper slag tailings contain: 29.69% SiO2, 3.98% Al2O3, 4.62% CaO, 2.18% MgO, 0.10% Na2O, 0.98% K2O, 51.04% Fe2O3, and the remainder is unavoidable impurities;

[0014] The primary aluminum ash contains: 43.942% SiO2, 20.53% Al2O3, 9.45% AlN, 3.02% CaO, 5.55% MgO, 11.41% Na2O, 2.68% K2O, 0.448% Fe2O3, and the balance is unavoidable impurities;

[0015] Secondary aluminum ash contains: 1.22% SiO2, 65.6% Al2O3, 23.1% AlN, 2.12% CaO, 0.32% MgO, 4.37% Na2O, 0.15% K2O, 0.82% Fe2O3, and the balance is unavoidable impurities;

[0016] The electrolytic aluminum slag contains: 5.23% SiO2, 63.74% Al2O3, 15.44% AlN, 1.85% CaO, 1.01% MgO, 0.24% Na2O, 0.31% K2O, 11.27% Fe2O3, and the balance is unavoidable impurities;

[0017] High titanium blast furnace slag contains: 31.42% SiO2, 16.38% Al2O3, 40.16% CaO, 7.35% MgO, 2.67% TiO2, 1.25% S, and the balance is unavoidable impurities.

[0018] Preferably, the volume density of the lightweight foamed glass-ceramics with good sound absorption performance is 0.40-0.49 g / cm 3 The compressive strength is not less than 4.2-5.21 MPa, the open porosity is 43.37%-61.02%, and the light foam glass-ceramics with good sound absorption performance of 1.3-1.6 mm in thickness has a sound absorption coefficient of 0.789-0.838 at 1500-2100 Hz.

[0019] The present invention also provides a method for preparing the lightweight foamed glass-ceramics having good sound absorption performance as described above, comprising the following steps:

[0020] The solid waste combination material, the pore former and the hardener are mixed and ground to obtain a complex;

[0021] Pressing the complex into a shape to obtain a formed body;

[0022] The green body is subjected to heat treatment to obtain foamed glass-ceramics.

[0023] Preferably, the process of heat treating the green body includes preheating reaction, vacuum treatment, pore formation and crystallization, structure fixation and furnace cooling stages in sequence.

[0024] Preferred:

[0025] In the preheating reaction stage, the green body is heated to 380-420°C and kept warm until the green body temperature is uniform;

[0026] In the vacuum treatment stage, the green body is further heated to 990-1010°C under a vacuum degree of 0.08-0.1 MPa;

[0027] During the pore formation and crystallization stage, the vacuum is released and the green body is heated to 1120-1160°C for 0-40 minutes.

[0028] During the structural fixing stage, the blank is cooled to 390-410°C and kept warm for 15-25 minutes.

[0029] In the furnace cooling stage, the blank is cooled to room temperature to obtain the lightweight foam micro-ceramic glass with good sound absorption performance.

[0030] Preferably, during the preheating reaction stage, the green body is kept warm for 15 to 25 minutes.

[0031] Preferred:

[0032] In the preheating reaction stage, the green body is heated to 380-420°C at a heating rate of 4-6°C / min;

[0033] During the vacuum treatment stage, the green body is heated to 990-1010°C at a heating rate of 9-11°C / min;

[0034] During the pore formation and crystallization stage, the green body is heated to 1120-1160°C at a heating rate of 9-11°C / min;

[0035] During the structural fixing stage, the green body is cooled to 390-410°C at a cooling rate of 9-11°C / min.

[0036] The present invention has the following beneficial effects:

[0037] The raw materials of the lightweight foam micro-ceramics with good sound absorption performance of the present invention are mostly industrial solid waste, such as copper slag tailings, waste glass, primary aluminum ash, secondary aluminum ash, electrolytic aluminum skimming slag and high-titanium blast furnace slag, and no additional pore-forming agent is required. When using these raw materials to prepare the lightweight foam micro-ceramics of the present invention, the pore-forming gas generated is mainly nitrogen, avoiding the generation of harmful gases. In the hardener, the titanium dioxide provided by the high-titanium blast furnace slag acts as the crystal nucleus center, providing more sites for the aggregation and growth of diopside crystals, thereby increasing the amount of crystallization. XRD and SEM results show that the crystal phase of the obtained foam micro-ceramics is mainly columnar diopside, but the obtained grains are large and the strength is low. At the same time, due to the high porosity of the foam micro-ceramics structure, its strength is further reduced and cannot meet the needs of most buildings, transportation, etc. The added rare earth oxides introduce dislocations and defects. These dislocations and defects can serve as the starting point for grain boundary migration and recrystallization, thereby promoting grain refinement, preventing grain growth, refining grains, increasing the number of crystals, and improving the strength of the matrix. The synergistic effect of titanium dioxide and rare earth oxides significantly improves the strength of foam micro-ceramics. The hardener also increases the corrosion resistance of foam micro-ceramics. Rare earth oxides are not easy to react chemically with other ingredients in the batch, which reduces the possible chemical reaction sites. The corrosion of foam micro-ceramics under acidic conditions is mainly caused by H + or H 3+ Ion exchange between O and mobile cations in the glass (usually between alkali metal cations). Alkali metal ions in the glass phase are more active than similar ions in the crystal and are susceptible to chemical corrosion. Under alkaline conditions, the dissociation of Si-OH on the glass surface is SiO - and H + The active alkaline earth metal ions in the sample will dissociate into SiO - The combination of the foam microcrystalline glass and the corrosion of the sample. Therefore, in order to make the foam microcrystalline glass have good chemical stability, it is necessary to minimize the content of the internal glass phase. The addition of the hardener increases the number of crystals, reduces the glass phase content, and enhances the chemical stability of the foam microcrystalline glass. This also enables the foam microcrystalline glass to maintain its morphology and structure well, and is not easy to fail, so it is suitable for various complex sound absorption environments. The open porosity of the lightweight foam microcrystalline glass of the present invention can reach up to 61.02%, and the sound absorption coefficient at the medium and low frequencies of 1500-2100Hz can reach 0.838, which has excellent sound absorption effect. At the same time, the density of the prepared foam microcrystalline glass is only 0.41g / cm 3 , and its compressive strength can also be maintained at 5.08MPa. This is a lightweight, high-strength foam micro-ceramic with a wide range of applications, and can be used as an excellent architectural sound-absorbing material. In summary, the present invention can utilize industrial solid waste to prepare foam micro-ceramics suitable for sound absorption and noise reduction. The pore-forming agent foaming process does not produce harmful gases, the raw material cost is low, and it can achieve large-scale utilization of solid waste from the metallurgical industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1(a) is a diagram of the sound absorption coefficient of the lightweight foam microcrystalline glass prepared in Example 1 of the present invention at different frequencies; Figure 1(b) is a diagram of the pore structure of the lightweight foam microcrystalline glass prepared in Example 1 of the present invention.

[0039] Figure 2(a) is a diagram of the sound absorption coefficient of the lightweight foam microcrystalline glass prepared in Example 2 of the present invention at different frequencies; Figure 2(b) is a diagram of the pore structure of the lightweight foam microcrystalline glass prepared in Example 2 of the present invention.

[0040] Figure 3(a) is a diagram of the sound absorption coefficient of the lightweight foam microcrystalline glass prepared in Example 3 of the present invention at different frequencies; Figure 3(b) is a diagram of the pore structure of the lightweight foam microcrystalline glass prepared in Example 3 of the present invention.

[0041] Figure 4(a) is a diagram of the sound absorption coefficient of the lightweight foam microcrystalline glass prepared in Example 4 of the present invention at different frequencies; Figure 4(b) is a diagram of the pore structure of the lightweight foam microcrystalline glass prepared in Example 4 of the present invention.

[0042] Figure 5(a) is a diagram of the sound absorption coefficient of the lightweight foam microcrystalline glass prepared in Example 5 of the present invention at different frequencies; Figure 5(b) is a diagram of the pore structure of the lightweight foam microcrystalline glass prepared in Example 5 of the present invention.

[0043] Figure 6(a) is a diagram of the sound absorption coefficient of the lightweight foam microcrystalline glass prepared in Example 6 of the present invention at different frequencies; Figure 6(b) is a diagram of the pore structure of the lightweight foam microcrystalline glass prepared in Example 6 of the present invention.

[0044] Figure 7(a) is a diagram of the sound absorption coefficient of the lightweight foam microcrystalline glass prepared in Example 7 of the present invention at different frequencies; Figure 7(b) is a diagram of the pore structure of the lightweight foam microcrystalline glass prepared in Example 7 of the present invention.

[0045] Figure 8(a) is a diagram of the sound absorption coefficient of the lightweight foam microcrystalline glass prepared in Example 8 of the present invention at different frequencies; Figure 8(b) is a diagram of the pore structure of the lightweight foam microcrystalline glass prepared in Example 8 of the present invention. DETAILED DESCRIPTION

[0046] The present invention will be further described below with reference to specific embodiments.

[0047] The present application provides a kind of light foam glass-ceramics with good sound absorption performance prepared from industrial waste slag and its preparation method, which utilizes solid waste combined material as raw material and adds appropriate pore-forming agent and hardening agent.Both the solid waste combined material and the pore-forming agent are industrial waste slag, and the pore-forming agent does not produce harmful gas during foaming process, which is low in cost and environmentally friendly.Vacuum treatment makes the prepared foam glass-ceramics have high open porosity, thereby obtaining good sound absorption performance.The addition of hardening agent ensures the strength of the foam glass-ceramics and widens its application range.

[0048] The raw materials of the light foam glass-ceramics according to the present application include, in mass fraction: 70-80 parts of solid waste combined material, 10-20 parts of pore-forming agent and 5-10 parts of hardening agent.The solid waste combined material includes copper slag tailings and waste glass, wherein the content of copper slag tailings is 30-40% of the mass of the solid waste combined material, and the balance is waste glass.The pore-forming agent is a mixture of one or more of primary aluminum ash, secondary aluminum ash and electrolytic aluminum slag.The hardening agent includes rare earth oxides and high-titanium blast furnace slag, wherein the content of rare earth oxides is 30-50% of the mass of the hardening agent, and the balance is high-titanium blast furnace slag.

[0049] The preparation method of the light foam glass-ceramics according to the present application includes: grinding and uniformly mixing the solid waste combined material, the pore-forming agent and the hardening agent, pressing the mixture into a green body, and then sequentially subjecting the green body to preheating reaction, vacuum treatment, pore-forming and crystallization, structure fixation and furnace cooling to obtain the light foam glass-ceramics according to the present application.

[0050] The preparation method of the light foam glass-ceramics according to the present application includes the following steps:

[0051] (1) Grinding the solid waste combined material, the pore-forming agent and the hardening agent in a ball mill to 200 mesh or less to obtain a uniformly mixed mixture;

[0052] (2) Pressing the ground mixture into a green body in a mold, placing the formed green body in a crucible coated with a release agent, and then placing it in a muffle furnace;

[0053] (3) subjecting the green body to the following heat treatment to obtain the foam glass-ceramics;

[0054] The heat treatment includes the following specific steps:

[0055] (a) increasing the temperature from room temperature to 380-420℃ at a rate of 5±1℃ / min and maintaining for 15-25 min.

[0056] (b) sealing the reactor and vacuumizing to a vacuum degree of 0.08-0.1 MPa, and then continuing to increase the temperature to 990-1010℃ at a rate of 10±1℃ / min.

[0057] (c) Open the reactor valve to release the vacuum, continue heating at a rate of 10±1°C / min to 1120-1160°C, and keep at this temperature for 0-40 min.

[0058] (d) Cool down to 390-410°C at a rate of 10±1°C / min and keep at this temperature for 15-25 min.

[0059] (e) cooling the mixture to room temperature along with the furnace to obtain the lightweight foamed glass-ceramics of the present invention.

[0060] In the above scheme of the present invention, in the temperature rising heat treatment stage after the preheating reaction stage, the blank (i.e., the blank) is heated under a vacuum environment. This is because the aluminum nitride in the pore-forming agent will undergo an oxidation reaction with oxygen in the air to generate nitrogen and aluminum oxide in the temperature rising heat treatment stage after preheating and the pore-forming crystallization stage (i.e., 380-1160°C). The aluminum oxide generated by this reaction will gradually coat the surface of the aluminum nitride particles as the reaction proceeds to form a dense aluminum oxide product layer, which hinders the contact between aluminum nitride and oxygen. Therefore, the amount of aluminum nitride actually participating in the oxidation reaction is limited. If the blank is subjected to a temperature rising heat treatment after the preheating reaction stage in an air atmosphere, a large amount of aluminum nitride will be consumed before entering the pore-forming stage, which will reduce the number of aluminum nitride sites that can participate in the oxidation pores in the pore-forming stage, seriously affecting the pore-forming effect. After heating to 990-1010°C under a vacuum environment, the vacuum is released. At this time, the temperature difference from the pore-forming stage is small, and the temperature can be raised to the required temperature for the pore-forming stage (i.e., 1120-1160°C) in a relatively short time, thereby preventing the loss of aluminum nitride before entering the pore-forming stage to the greatest extent. At the same time, the softening of the blank at 990-1010°C and the transformation to produce a liquid phase are not obvious. At this time, the release of the vacuum can introduce oxygen before the liquid phase excessively hinders oxygen from entering the blank, thereby ensuring the oxygen content in the pore-forming stage. In the pore-forming stage, the blank is placed in an air atmosphere. At this time, affected by the previous vacuum stage, the aluminum nitride in the pore-forming agent does not come into contact with oxygen during the temperature-raising heat treatment stage. Its oxidation reaction with oxygen is suppressed due to the lack of the oxidant (oxygen). Therefore, the loss of aluminum nitride in the blank is extremely small, and the aluminum nitride content in the system is extremely rich. During the pore-forming stage, at high temperatures of 1120-1160°C, air carrying a large amount of oxygen flows into the billet. The abundant aluminum nitride and oxygen react rapidly to produce a large amount of gas. This driving force for pore growth in the system is extremely strong, and the internal pressure generated by this large amount of gas is, to a certain extent, greater than the surface tension of the viscous phase. This allows some of the gas to break through the viscous phase at points of weak surface tension, connecting with other bubbles through small channels, thereby forming a large number of open pores. Furthermore, the gas product of the pore-forming agent is nitrogen, which solves the problem of solid waste storage without causing waste gas pollution.

[0061] The high-titanium blast furnace slag provides titanium dioxide as a crystal nucleus center, providing more sites for the aggregation and growth of diopside crystals, and improving the crystalline amount. The XRD and SEM results show that the crystal phase of the obtained foam glass-ceramics is mainly columnar diopside, but the obtained crystal grains are relatively large, and the strength is relatively low. Meanwhile, due to the high open porosity structure of the foam glass-ceramics, the strength is further reduced, and the foam glass-ceramics cannot meet the needs of large buildings, transportation and the like. The rare earth oxides introduced dislocations and defects, which can be used as the starting point of grain boundary migration and recrystallization, thereby promoting the refinement of the crystal grains, preventing the growth of the crystal grains, refining the crystal grains, increasing the number of the crystal grains, and improving the strength of the matrix. Through the synergistic effect of the titanium dioxide and the rare earth oxides, the strength of the foam glass-ceramics is greatly improved.

[0062] The hardening agent can also increase the corrosion resistance of the foam glass-ceramics. The rare earth oxides are not prone to chemical reactions with other components in the batch, which reduces the possible chemical reaction sites. The corrosion of the foam glass-ceramics under acidic conditions is mainly the ion exchange between H + or H 3+ O and movable cations (usually between alkali metal cations) in the glass. The alkali metal ions in the glass phase have greater activity than the same ions in the crystal, and are easily affected by chemical corrosion. Under alkaline conditions, the dissociation of Si-OH on the surface of the glass is - and H + The active alkaline earth metal ions of the sample will combine with the dissociated SiO - , and further corrode the sample. Therefore, in order to make the foam glass-ceramics have good chemical stability, it is necessary to reduce the content of the internal glass phase as much as possible, the addition of the hardening agent increases the number of crystals, reduces the content of the glass phase, and enhances the chemical stability of the foam glass-ceramics. This also enables the foam glass-ceramics to well maintain the morphology and structure, and not to be easily failed, thereby being suitable for various complex sound absorption environments.

[0063] The lightweight foam glass-ceramics obtained by the above scheme of the present application has good sound absorption performance, specifically (see the over of the examples), the volume density is 0.41-0.49 g / cm 3 , the compressive strength is not less than 4.2-5.21 MPa, the open porosity is 43.37%-61.02%, and the sound absorption coefficient of the lightweight foam glass-ceramics with good sound absorption performance in a thickness of 1.3-1.6 mm is

[0064] In the following examples of the present application, the copper residue selected from tailings contains: 29.69% of SiO2, 3.98% of Al2O3, 4.62% of CaO, 2.18% of MgO, 0.10% of Na2O, 0.98% of K2O, 51.04% of Fe2O3, and the balance is inevitable impurities;

[0065] The primary aluminum ash contains: 43.942% SiO2, 20.53% Al2O3, 9.45% AlN, 3.02% CaO, 5.55% MgO, 11.41% Na2O, 2.68% K2O, 0.448% Fe2O3, and the balance is unavoidable impurities;

[0066] Secondary aluminum ash contains: 1.22% SiO2, 65.6% Al2O3, 23.1% AlN, 2.12% CaO, 0.32% MgO, 4.37% Na2O, 0.15% K2O, 0.82% Fe2O3, and the balance is unavoidable impurities;

[0067] The electrolytic aluminum slag contains: 5.23% SiO2, 63.74% Al2O3, 15.44% AlN, 1.85% CaO, 1.01% MgO, 0.24% Na2O, 0.31% K2O, 11.27% Fe2O3, and the balance is unavoidable impurities;

[0068] High titanium blast furnace slag contains: 31.42% SiO2, 16.38% Al2O3, 40.16% CaO, 7.35% MgO, 2.67% TiO2, 1.25% S, and the balance is unavoidable impurities.

[0069] Example 1

[0070] The lightweight foam microcrystalline glass with good sound absorption performance of this embodiment includes the following raw material components in parts by weight: 80 parts of solid waste combination materials, 10 parts of pore formers, and 10 parts of hardeners; the mass percentage of copper slag tailings in the solid waste combination materials is 35%, and the balance is waste glass; the pore former is a mixture of primary aluminum ash, secondary aluminum ash and electrolytic aluminum skimming slag, wherein the mass percentage of primary aluminum ash is 25%, the mass percentage of secondary aluminum ash is 50%, and the mass percentage of electrolytic aluminum skimming slag is 25%; the mass content of rare earth oxides in the hardener is 40%, and the balance is high-titanium blast furnace slag.

[0071] The method for preparing the lightweight foamed glass-ceramics with good sound absorption performance in this embodiment includes the following steps:

[0072] (1) According to the proportion of the above raw material components, 20 g of raw materials are prepared to obtain a batch material.

[0073] (2) The batch material prepared in step (1) is placed in a planetary ball mill and ground for 40 minutes so that the batch material can pass through a 200-mesh sieve. The sieve underflow is pressed for 2 minutes using a hydraulic press at a force of 40±2KN to obtain a foam micro-ceramic body. The selected crucible is a flat-bottomed corundum crucible. A release agent is evenly applied to the inner wall of the crucible. After the release agent is dry, the foam micro-ceramic body is placed in the crucible. A vacuum-resistant high-temperature container is placed in a muffle furnace, and the crucible containing the foam micro-ceramic body is placed in the container.

[0074] (3) Heat treatment of the blank: first, increase the temperature from room temperature to 400°C at a rate of 5±1°C / min, keep it warm for 20 minutes to preheat and remove moisture, then seal the container and evacuate it to a vacuum degree of 0.09 MPa, increase the temperature to 1000°C at a rate of 10±1°C / min, open the vacuum pump valve to let air in, so that the blank is in an air atmosphere, continue heating to 1150°C, keep it warm for 20 minutes to foam, then cool it down to crystallize at a rate of 10±1°C / min, keep it warm when it cools to 400°C for 20 minutes, and then cool it to room temperature with the furnace to obtain the lightweight foam microcrystalline glass of this embodiment.

[0075] The sound absorption coefficient curves of the lightweight foam micro-ceramics obtained in this embodiment at different frequencies are shown in FIG1( a ). It can be seen that the sound absorption coefficient of the lightweight foam micro-ceramics at this time can reach up to 0.838 at medium and low frequencies of 1500 to 2100 Hz.

[0076] The pore structure diagram of the lightweight foam microcrystalline glass obtained in this embodiment is shown in Figure 1(b). It can be seen that the pore size uniformity of the foam microcrystalline glass is good, the pore size is moderate, and there are obvious small openings on the walls of the large pores, and the number is large.

[0077] Example 2

[0078] The lightweight foamed micro-ceramic glass with good sound absorption performance of this embodiment includes the following raw material components by weight: 80 parts of solid waste composite material, 15 parts of pore-forming agent, and 5 parts of hardener; the weight percentage of copper slag tailings in the solid waste composite material is 30%, and the balance is waste glass; the pore-forming agent is secondary aluminum ash; the weight percentage of rare earth oxide in the hardener is 30%, and the balance is high-titanium blast furnace slag;

[0079] The method for preparing the lightweight foamed glass-ceramics with good sound absorption performance in this embodiment includes the following steps:

[0080] (1) According to the proportion of the above raw material components, 20 g of raw materials are prepared to obtain a batch material.

[0081] (2) The batch material prepared in step (1) is placed in a planetary ball mill and ground for 40 minutes so that the batch material can pass through a 200-mesh sieve. The sieve underflow is pressed for 2 minutes using a hydraulic press at a force of 40±2KN to obtain a foam micro-ceramic body. The selected crucible is a flat-bottomed corundum crucible. A release agent is evenly applied to the inner wall of the crucible. After the release agent is dry, the foam micro-ceramic body is placed in the crucible. A vacuum-resistant high-temperature container is placed in a muffle furnace, and the crucible containing the foam micro-ceramic body is placed in the container.

[0082] (3) Heat treatment of the blank: first, increase the temperature from room temperature to 400°C at a rate of 5±1°C / min, keep it warm for 20 minutes to preheat and remove moisture, then seal the container and evacuate it to a vacuum degree of 0.09 MPa, increase the temperature to 1000°C at a rate of 10±1°C / min, open the vacuum pump valve to let air in, so that the blank is in an air atmosphere, continue heating to 1150°C, keep it warm for 20 minutes to foam, then cool it down to crystallize at a rate of 10±1°C / min, keep it warm when it cools to 400°C for 20 minutes, and then cool it to room temperature with the furnace to obtain the lightweight foam microcrystalline glass of this embodiment.

[0083] The sound absorption coefficient curves of the lightweight foam micro-ceramics obtained in this embodiment at different frequencies are shown in FIG2( a ). It can be seen that the sound absorption coefficient of the lightweight foam micro-ceramics at this time can reach up to 0.805 at medium and low frequencies of 1500 to 2100 Hz.

[0084] The pore structure diagram of the lightweight foam microcrystalline glass obtained in this embodiment is shown in Figure 2(b). It can be seen that the pore size uniformity of the foam microcrystalline glass is good, the pore size is relatively moderate, and there are a certain number of small openings on the walls of the large pores.

[0085] Example 3

[0086] The lightweight foamed micro-ceramics with good sound absorption performance of this embodiment includes the following raw material components by weight: 80 parts of a solid waste composite material, 10 parts of a pore former, and 10 parts of a hardener; the solid waste composite material comprises 40% by weight of copper slag tailings, with the remainder being waste glass; the pore former is a mixture of primary aluminum ash and secondary aluminum ash, with the primary aluminum ash accounting for 50% by weight and the secondary aluminum ash accounting for 50% by weight; the hardener comprises 50% by weight of a rare earth oxide, with the remainder being high-titanium blast furnace slag.

[0087] The method for preparing the lightweight foamed glass-ceramics with good sound absorption performance in this embodiment includes the following steps:

[0088] (1) According to the proportion of the above raw material components, 20 g of raw materials are prepared to obtain a batch material.

[0089] (2) The batch material prepared in step (1) is placed in a planetary ball mill and ground for 40 minutes so that the batch material can pass through a 200-mesh sieve. The sieve underflow is pressed for 2 minutes using a hydraulic press at a force of 40±2KN to obtain a foam micro-ceramic body. The selected crucible is a flat-bottomed corundum crucible. A release agent is evenly applied to the inner wall of the crucible. After the release agent is dry, the foam micro-ceramic body is placed in the crucible. A vacuum-resistant high-temperature container is placed in a muffle furnace, and the crucible containing the foam micro-ceramic body is placed in the container.

[0090] (3) Heat treatment of the blank: first, increase the temperature from room temperature to 400°C at a rate of 5±1°C / min, keep it warm for 20 minutes to preheat and remove moisture, then seal the container and evacuate it to a vacuum degree of 0.09 MPa, increase the temperature to 1000°C at a rate of 10±1°C / min, open the vacuum pump valve to let air in, so that the blank is in an air atmosphere, continue heating to 1150°C, keep it warm for 20 minutes to foam, then cool it down to crystallize at a rate of 10±1°C / min, keep it warm when it cools to 400°C for 20 minutes, and then cool it to room temperature with the furnace to obtain the lightweight foam microcrystalline glass of this embodiment.

[0091] The sound absorption coefficient curves of the lightweight foam micro-ceramics obtained in this embodiment at different frequencies are shown in FIG3( a ). It can be seen that the sound absorption coefficient of the lightweight foam micro-ceramics at this time can reach up to 0.815 at medium and low frequencies of 1500 to 2100 Hz.

[0092] The pore structure diagram of the lightweight foam microcrystalline glass obtained in this embodiment is shown in Figure 3(b). It can be seen that the pore size uniformity of the lightweight foam microcrystalline glass is good, the pore size is moderate, and the small openings on the walls of the large pores are obvious and numerous.

[0093] Example 4

[0094] The lightweight foamed micro-ceramics with good sound absorption performance of this embodiment includes the following raw material components by weight: 70 parts of a solid waste composite material, 20 parts of a pore former, and 10 parts of a hardener; the solid waste composite material comprises 30% by weight of copper slag tailings, with the remainder being waste glass; the pore former is a mixture of secondary aluminum ash and electrolytic aluminum skimming slag, wherein the secondary aluminum ash accounts for 50% by weight and the electrolytic aluminum skimming slag accounts for 50% by weight; the hardener comprises 45% by weight of a rare earth oxide, with the remainder being high-titanium blast furnace slag.

[0095] The method for preparing the lightweight foamed glass-ceramics with good sound absorption performance in this embodiment includes the following steps:

[0096] (1) According to the proportion of the above raw material components, 20 g of raw materials are prepared to obtain a batch material.

[0097] (2) The batch material prepared in step (1) is placed in a planetary ball mill and ground for 37 minutes so that the batch material can pass through a 200-mesh sieve. The sieve underflow is pressed for 2.5 minutes using a hydraulic press at a force of 40±2KN to obtain a foam micro-ceramic body. The selected crucible is a flat-bottomed corundum crucible. A release agent is evenly applied to the inner wall of the crucible. After the release agent is dry, the foam micro-ceramic body is placed in the crucible. A vacuum-resistant high-temperature container is placed in a muffle furnace, and the crucible containing the foam micro-ceramic body is placed in the container.

[0098] (3) Heat treatment of the blank: first, increase the temperature from room temperature to 400°C at a rate of 5±1°C / min, keep it warm for 20 minutes to preheat and remove moisture, then seal the container and evacuate it to a vacuum degree of 0.09 MPa, increase the temperature to 1000°C at a rate of 10±1°C / min, open the vacuum pump valve to let air in, so that the blank is in an air atmosphere, continue heating to 1150°C, keep it warm for 20 minutes to foam, then cool it down to crystallize at a rate of 10±1°C / min, keep it warm when it cools to 400°C for 20 minutes, and then cool it to room temperature with the furnace to obtain the lightweight foam microcrystalline glass of this embodiment.

[0099] The sound absorption coefficient curves of the lightweight foam micro-ceramics obtained in this embodiment at different frequencies are shown in FIG4( a ). It can be seen that the sound absorption coefficient of the lightweight foam micro-ceramics at this time can reach up to 0.789 at medium and low frequencies of 1500 to 2100 Hz.

[0100] The pore structure diagram of the lightweight foam microcrystalline glass obtained in this embodiment is shown in Figure 4(b). It can be seen that the pore size uniformity of the lightweight foam microcrystalline glass is relatively good at this time, but the pore size is large, the pore wall is thicker, and the number of openings on the large pore wall is small.

[0101] Example 5

[0102] The lightweight foamed micro-ceramic glass with good sound absorption performance of this embodiment includes the following raw material components by weight: 75 parts of solid waste composite material, 15 parts of pore former, and 10 parts of hardener; the solid waste composite material comprises 30% by weight of copper slag tailings, with the remainder being waste glass; the pore former is a mixture of secondary aluminum ash and electrolytic aluminum skimming slag, wherein the secondary aluminum ash accounts for 50% by weight and the electrolytic aluminum skimming slag accounts for 50% by weight; the hardener comprises 45% by weight of rare earth oxide, with the remainder being high-titanium blast furnace slag.

[0103] The method for preparing the lightweight foamed glass-ceramics with good sound absorption performance in this embodiment includes the following steps:

[0104] (1) According to the proportion of the above raw material components, 20 g of raw materials are prepared to obtain a batch material.

[0105] (2) The batch material prepared in step (1) is placed in a planetary ball mill and ground for 35 minutes so that the batch material can pass through a 200-mesh sieve. The sieve underflow is pressed for 3 minutes using a hydraulic press at a force of 40±2KN to obtain a foam micro-ceramic body. The selected crucible is a flat-bottomed corundum crucible. A release agent is evenly applied to the inner wall of the crucible. After the release agent is dry, the foam micro-ceramic body is placed in the crucible. A vacuum-resistant high-temperature container is placed in a muffle furnace, and the crucible containing the foam micro-ceramic body is placed in the container.

[0106] (3) Heat treatment of the blank: first, heat the blank from room temperature to 420°C at a rate of 5±1°C / min, keep it warm for 25 minutes to preheat and remove moisture, then seal the container and evacuate it to a vacuum degree of 0.10 MPa, heat it to 1010°C at a rate of 10±1°C / min, open the vacuum pump valve to let in air, so that the blank is in an air atmosphere, continue heating to 1160°C, keep it warm for 20 minutes to form a hole, then cool it down to crystallize at a rate of 10±1°C / min, keep it warm when it cools to 410°C for 25 minutes, and then cool it to room temperature with the furnace to obtain the lightweight foam microcrystalline glass of this embodiment.

[0107] The sound absorption coefficient curves of the lightweight foam micro-ceramics obtained in this embodiment at different frequencies are shown in FIG5( a ). It can be seen that the sound absorption coefficient of the lightweight foam micro-ceramics at this time can reach up to 0.794 at medium and low frequencies of 1500 to 2100 Hz.

[0108] The pore structure diagram of the lightweight foam micro-ceramics obtained in this embodiment is shown in Figure 5(b). It can be seen that the pores of the lightweight foam micro-ceramics are well uniform, and there are obvious small openings on the walls of the large pores.

[0109] Example 6

[0110] The lightweight foamed micro-ceramic glass with good sound absorption performance of this embodiment comprises the following raw material components by weight: 80 parts of a solid waste composite material, 10 parts of a pore-forming agent, and 10 parts of a hardener; the solid waste composite material comprises 30% by weight of copper slag tailings, with the remainder being waste glass; the pore-forming agent is electrolytic aluminum skimming slag; the hardener comprises 45% by weight of rare earth oxides, with the remainder being high-titanium blast furnace slag;

[0111] The method for preparing the lightweight foamed glass-ceramics with good sound absorption performance in this embodiment includes the following steps:

[0112] (1) According to the proportion of the above raw material components, 20 g of raw materials are prepared to obtain a batch material.

[0113] (2) The batch material prepared in step (1) is placed in a planetary ball mill and ground for 40 minutes so that the batch material can pass through a 200-mesh sieve. The sieve underflow is pressed for 2 minutes using a hydraulic press at a force of 40±2KN to obtain a foam micro-ceramic body. The selected crucible is a flat-bottomed corundum crucible. A release agent is evenly applied to the inner wall of the crucible. After the release agent is dry, the foam micro-ceramic body is placed in the crucible. A vacuum-resistant high-temperature container is placed in a muffle furnace, and the crucible containing the foam micro-ceramic body is placed in the container.

[0114] (3) Heat treatment of the blank: first, increase the temperature from room temperature to 400°C at a rate of 5±1°C / min, keep it warm for 20 minutes to preheat and remove moisture, then seal the container and evacuate it to a vacuum degree of 0.08MPa, increase the temperature to 990°C at a rate of 10±1°C / min, open the vacuum pump valve to let in air, so that the blank is in an air atmosphere, continue heating to 1120°C, keep it warm for 20 minutes to form a hole, then cool it down to crystallize at a rate of 10±1°C / min, keep it warm for 15 minutes when it cools to 390°C, and then cool it to room temperature with the furnace to obtain the lightweight foam microcrystalline glass of this embodiment.

[0115] The sound absorption coefficient curves of the lightweight foam micro-ceramics obtained in this embodiment at different frequencies are shown in FIG6( a ). It can be seen that the sound absorption coefficient of the lightweight foam micro-ceramics at this time can reach up to 0.808 at medium and low frequencies of 1500 to 2100 Hz.

[0116] The pore structure diagram of the lightweight foam microcrystalline glass obtained in this embodiment is shown in Figure 6(b). It can be seen that the pores of the lightweight foam microcrystalline glass are better uniform, the pore diameter is smaller, the pore wall is slightly thicker, and the number of small openings in the pore wall of the large pore is smaller.

[0117] Example 7

[0118] The lightweight foamed micro-ceramics with good sound absorption performance of this embodiment includes the following raw material components by weight: 80 parts of a solid waste composite material, 10 parts of a pore former, and 10 parts of a hardener; the solid waste composite material comprises 30% by weight of copper slag tailings, with the remainder being waste glass; the pore former is a mixture of primary aluminum ash, secondary aluminum ash, and electrolytic aluminum skimming slag, wherein the primary aluminum ash accounts for 25% by weight, the secondary aluminum ash accounts for 50% by weight, and the electrolytic aluminum skimming slag accounts for 25% by weight; the hardener comprises 45% by weight of a rare earth oxide, with the remainder being high-titanium blast furnace slag.

[0119] The method for preparing the lightweight foamed glass-ceramics with good sound absorption performance in this embodiment includes the following steps:

[0120] (1) According to the proportion of the above raw material components, 20 g of raw materials are prepared to obtain a batch material.

[0121] (2) The batch material prepared in step (1) is placed in a planetary ball mill and ground for 40 minutes so that the batch material can pass through a 200-mesh sieve. The sieve underflow is pressed for 2 minutes using a hydraulic press at a force of 40±2KN to obtain a foam micro-ceramic body. The selected crucible is a flat-bottomed corundum crucible. A release agent is evenly applied to the inner wall of the crucible. After the release agent is dry, the foam micro-ceramic body is placed in the crucible. A vacuum-resistant high-temperature container is placed in a muffle furnace, and the crucible containing the foam micro-ceramic body is placed in the container.

[0122] (3) Heat treatment of the blank: first, increase the temperature from room temperature to 400°C at a rate of 5±1°C / min, keep it warm for 20 minutes to preheat and remove moisture, then seal the container and evacuate it to a vacuum degree of 0.09 MPa, increase the temperature to 1000°C at a rate of 10±1°C / min, open the vacuum pump valve to let in air, so that the blank is in an air atmosphere, continue heating to 1150°C, keep it warm for 40 minutes to form a hole, then cool it down to crystallize at a rate of 10±1°C / min, keep it warm when it cools to 400°C for 20 minutes, and then cool it to room temperature with the furnace to obtain the lightweight foam microcrystalline glass of this embodiment.

[0123] The sound absorption coefficient curves of the lightweight foam micro-ceramics obtained in this embodiment at different frequencies are shown in FIG7 (a). It can be seen that the sound absorption coefficient of the lightweight foam micro-ceramics at this time can reach up to 0.790 at medium and low frequencies of 1500 to 2100 Hz.

[0124] The pore structure diagram of the lightweight foam microcrystalline glass obtained in this embodiment is shown in Figure 7(b). It can be seen that the pores of the lightweight foam microcrystalline glass are more uniform at this time, there are more pores with larger pore diameters, the pore walls are thicker, and there are small openings on the walls of the large pores.

[0125] Example 8

[0126] The lightweight foamed micro-ceramics with good sound absorption performance of this embodiment includes the following raw material components by weight: 80 parts of a solid waste composite material, 10 parts of a pore former, and 10 parts of a hardener; the solid waste composite material comprises 30% by weight of copper slag tailings, with the remainder being waste glass; the pore former is a mixture of secondary aluminum ash and primary aluminum ash, with the secondary aluminum ash accounting for 50% by weight and the primary aluminum ash accounting for 50% by weight; the hardener comprises 45% by weight of a rare earth oxide, with the remainder being high-titanium blast furnace slag.

[0127] The method for preparing the lightweight foamed glass-ceramics with good sound absorption performance in this embodiment includes the following steps:

[0128] (1) According to the proportion of the above raw material components, 20 g of raw materials are prepared to obtain a batch material.

[0129] (2) The batch material prepared in step (1) is placed in a planetary ball mill and ground for 40 minutes so that the batch material can pass through a 200-mesh sieve. The sieve underflow is pressed for 2 minutes using a hydraulic press at a force of 40±2KN to obtain a foam micro-ceramic body. The selected crucible is a flat-bottomed corundum crucible. A release agent is evenly applied to the inner wall of the crucible. After the release agent is dry, the foam micro-ceramic body is placed in the crucible. A vacuum-resistant high-temperature container is placed in a muffle furnace, and the crucible containing the foam micro-ceramic body is placed in the container.

[0130] (3) Heat treatment of the blank: first, increase the temperature from room temperature to 400°C at a rate of 5±1°C / min, keep it warm for 20 minutes to preheat and remove moisture, then seal the container and evacuate it to a vacuum degree of 0.09 MPa, increase the temperature to 1000°C at a rate of 10±1°C / min, open the vacuum pump valve to let in air, so that the blank is in an air atmosphere, continue heating to 1160°C, keep it warm for 0 minutes to form a hole, then cool it down to crystallize at a rate of 10±1°C / min, keep it warm when it cools to 400°C for 20 minutes, and then cool it to room temperature with the furnace to obtain the lightweight foam microcrystalline glass of this embodiment.

[0131] The sound absorption coefficient curves of the lightweight foam micro-ceramics obtained in this embodiment at different frequencies are shown in FIG8( a ). It can be seen that the sound absorption coefficient of the lightweight foam micro-ceramics at this time can reach up to 0.821 at medium and low frequencies of 1500 to 2100 Hz.

[0132] The pore structure diagram of the lightweight foam microcrystalline glass obtained in this embodiment is shown in Figure 8(b). It can be seen that the pores of the lightweight foam microcrystalline glass are well uniform, the pore diameter is moderate, and there are obvious small openings on the walls of the large pores.

[0133] The volume density of foam glass-ceramics can be calculated using the following formula:

[0134]

[0135] Where ρ is the volume density of foam glass-ceramics (g / cm 3 ), M is the sample mass (g), V is the sample volume (cm 3 ).

[0136] The compressive strength of foam micro-ceramic glass was tested using a universal material testing machine.

[0137] The sound absorption performance of foam glass was tested using the standing wave tube method specified in the national standard GB / T 18696.2-2002, "Acoustics - Test of Sound Absorption Coefficient and Acoustic Impedance in Impedance Tubes." The material was processed into cylindrical blocks with a diameter of 29 mm. The sound absorption coefficient of the sample can be obtained using the following formula:

[0138]

[0139] Among them, α is the sound absorption coefficient and n is the standing wave ratio.

[0140] By performing volume density calculation, open porosity calculation, compressive strength test and sound absorption coefficient test on Example 1, Example 2 and Example 3, the results of volume density, compressive strength, open porosity and sound absorption coefficient are shown in Table 1:

[0141] Table 1

[0142]

[0143]

[0144] As can be seen from the above structure, the present invention is applicable to the production process of foam micro-ceramics, using industrial waste residues with abundant sources as the main raw material. It can be seen from the table that the lightweight foam micro-ceramics prepared by the present invention has good sound absorption performance at 1500-2100 Hz, with the sound absorption coefficient reaching up to 0.838, and the volume density at this time is also maintained at a very low 0.41 g / cm 3 , compressive strength 5.08MPa, providing a high-quality and low-cost method for producing foam microcrystalline glass from composite industrial waste residues in the field of sound absorption, realizing high-value utilization of solid waste, improving product quality, reducing production costs, saving resources and protecting the environment.

[0145] Finally, it should be noted that although the present invention is illustratively described through preferred embodiments, the present invention is not limited to the above embodiments, and appropriate changes can be implemented within the scope of protection of the present invention without violating the spirit and scope of the present invention.

Claims

1. A lightweight foam glass-ceramic with good sound absorption performance, characterized in that: Calculated by weight, the raw materials include: 70-80 parts of solid waste combination materials, 10-20 parts of pore formers, and 5-10 parts of hardeners; The solid waste composite material comprises copper slag tailings and waste glass, wherein the content of copper slag tailings is 30% to 40% of the mass of the solid waste composite material, and the remainder is waste glass; The pore-forming agent is one or a mixture of primary aluminum ash, secondary aluminum ash and electrolytic aluminum slag; The hardener comprises rare earth oxide and high-titanium blast furnace slag, wherein the content of rare earth oxide is 30% to 50% of the mass of the hardener, and the balance is high-titanium blast furnace slag.

2. The lightweight foamed glass-ceramics with good sound absorption performance according to claim 1, characterized in that: The rare earth oxide is one or a mixture of erbium oxide, lanthanum oxide and yttrium oxide.

3. The lightweight foamed glass-ceramics with good sound absorption performance according to claim 1, characterized in that: The particle size of the solid waste combination material, pore former and hardener is above 200 meshes.

4. The lightweight foamed glass-ceramics with good sound absorption performance according to claim 1, characterized in that: In mass percentage: The copper slag tailings contain: 29.69% SiO2, 3.98% Al2O3, 4.62% CaO, 2.18% MgO, 0.10% Na2O, 0.98% K2O, 51.04% Fe2O3, and the balance is unavoidable impurities; Primary aluminum ash contains: 43.942% SiO2, 20.53% Al2O3, 9.45% AlN, 3.02% CaO, 5.55% MgO, 11.41% Na2O, 2.68% K2O, 0.448% Fe2O3, and the balance is unavoidable impurities; Secondary aluminum ash contains: 1.22% SiO2, 65.6% Al2O3, 23.1% AlN, 2.12% CaO, 0.32% MgO, 4.37% Na2O, 0.15% K2O, 0.82% Fe2O3, and the balance is unavoidable impurities; The electrolytic aluminum slag contains: 5.23% SiO2, 63.74% Al2O3, 15.44% AlN, 1.85% CaO, 1.01% MgO, 0.24% Na2O, 0.31% K2O, 11.27% Fe2O3, and the balance is unavoidable impurities; High titanium blast furnace slag contains: 31.42% SiO2, 16.38% Al2O3, 40.16% CaO, 7.35% MgO, 2.67% TiO2, 1.25% S, and the balance is unavoidable impurities.

5. The lightweight foamed glass-ceramics with good sound absorption performance according to claim 1, characterized in that: The volume density of the lightweight foamed glass-ceramics with good sound absorption performance is 0.40-0.49 g / cm 3 The compressive strength is 4.2~5.21MPa, the open porosity is 43.37%~61.02%, and the lightweight foam microcrystalline glass with good sound absorption performance with a thickness of 1.3~1.6mm has a sound absorption coefficient of 0.789~0.838 at 1500~2100Hz.

6. The method for preparing the lightweight foamed glass-ceramics with good sound absorption performance according to any one of claims 1 to 5, characterized in that: The process includes the following: The solid waste combination material, the pore former and the hardener are mixed and ground to obtain a complex; Pressing the complex into a shape to obtain a formed body; The green body is subjected to heat treatment to obtain foamed glass-ceramics.

7. The method for preparing lightweight foamed glass-ceramics with good sound absorption performance according to claim 6, characterized in that: The process of heat treating the green body includes preheating reaction, vacuum treatment, pore formation and crystallization, structure fixation and furnace cooling stages in sequence.

8. The method for preparing lightweight foamed glass-ceramics with good sound absorption performance according to claim 7, characterized in that: In the preheating reaction stage, the green body is heated to 380-420°C and kept warm until the green body temperature is uniform; In the vacuum treatment stage, the green body is further heated to 990-1010°C under a vacuum degree of 0.08-0.1 MPa; During the pore formation and crystallization stage, the vacuum is released and the green body is heated to 1120-1160°C for 0-40 minutes. During the structural fixing stage, the blank is cooled to 390-410°C and kept warm for 15-25 minutes; In the furnace cooling stage, the blank is cooled to room temperature to obtain the lightweight foam micro-ceramic glass with good sound absorption performance.

9. The method for preparing lightweight foamed glass-ceramics with good sound absorption performance according to claim 8, characterized in that: During the preheating reaction stage, the green body is kept warm for 15 to 25 minutes.

10. The method for preparing lightweight foamed glass-ceramics with good sound absorption performance according to claim 8, characterized in that: In the preheating reaction stage, the green body is heated to 380-420°C at a heating rate of 4-6°C / min; During the vacuum treatment stage, the green body is heated to 990-1010°C at a heating rate of 9-11°C / min; During the pore formation and crystallization stage, the green body is heated to 1120-1160°C at a heating rate of 9-11°C / min; During the structural fixing stage, the green body is cooled to 390-410°C at a cooling rate of 9-11°C / min.

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