Glass ceramic as well as preparation method and application thereof

Abstract

The invention discloses microcrystalline glass and a preparation method thereof. The preparation method comprises the following steps: burdening: crushing and sieving yellow phosphorus slag, and uniformly mixing the yellow phosphorus slag with other raw materials to obtain a mixed raw material; melting: fully melting the mixed raw materials in a high-temperature furnace to form uniform molten glass; performing water quenching: performing water quenching on the molten glass liquid, and grinding the molten glass liquid into glass powder; molding: uniformly mixing the ground and sieved glass powder with a nucleating agent, and then loading the mixture into a mold for compression molding; and crystallization: placing the to-be-crystallized sample subjected to compression molding in a crystallization furnace for crystallization treatment, annealing, cooling to room temperature along with the furnace, and processing to obtain the microcrystalline glass product. The microcrystalline glass provided by the invention has excellent mechanical properties and chemical properties, and can be applied to the fields of architectural decoration and mechanical industry.

Description

Technical Field

[0001] The present invention relates to the technical field of microcrystalline glass materials and preparation thereof, and in particular to slag microcrystalline glass and a preparation method and application thereof. Background Art

[0002] Glass-ceramic, also known as glass ceramics, is a polycrystalline solid material made by controlling the crystallization of a base glass with a specific composition. Glass-ceramic is a polycrystalline composite material with fine grains and uniform distribution in the glass body, which is made by controlling the crystallization of a base glass with a specific composition at a certain temperature. The performance of glass-ceramic is determined by the mineral composition of the crystalline phase and the chemical composition and quantity of the glass. Therefore, glass-ceramic combines the characteristics of both glass and ceramics, so it is also called glass-ceramic or crystallized glass.

[0003] As a new type of inorganic non-metallic material, glass-ceramics has the characteristics of cheap and readily available raw materials, simple preparation process and excellent performance. It is a new type of material with high performance, low cost and broad application market, and has attracted extensive attention from materials scientists at home and abroad.

[0004] Slag glass-ceramics are silicate glass-ceramics made from various industrial solid wastes such as tailings, metallurgical slag, industrial slag or slag as the main raw materials. Compared with ordinary silicate glass, this glass-ceramics has high mechanical strength, good corrosion resistance and good chemical corrosion resistance. It can be used to make pipe shells, building decorations or chemical reaction tank linings, etc. Its raw materials are industrial waste slag, which has a wide range of sources, large quantities and low costs. The preparation of glass-ceramics with industrial tailings, mining waste slag as the main raw materials is of great significance to the comprehensive and effective utilization of industrial solid wastes. It can not only effectively treat various types of industrial solid wastes that are piled up, alleviate the social and environmental pressures brought by them, and significantly reduce production costs, but also slag glass-ceramics has a strong solidification effect on heavy metal ions, which can effectively protect the ecological environment and meet the requirements of national resource recycling and sustainable development.

[0005] At present, there is still a lot of room for market promotion of glass-ceramics prepared with slag raw materials. Slag glass-ceramics have high mechanical strength, excellent corrosion resistance and weathering resistance, and are a good substitute for natural stone. They can be used in the fields of architectural decoration and mechanical industry. In particular, glass-ceramics used in the building materials industry require not only a hardness similar to that of natural marble, but also high bending strength and compressive strength. However, slag has a complex composition and a high content of certain oxides, so its utilization rate is limited in the preparation of glass-ceramics. The common slag glass-ceramics are currently limited by the preparation process and preparation method. Slag raw materials are generally only added in small amounts as a nucleating agent, as a substance to promote glass crystallization and performance optimization. Therefore, how to improve the utilization rate of slag when using slag to prepare glass-ceramics has become an urgent problem to be solved. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the current prior art, solve the problems of low slag mixing ratio and poor mechanical properties of microcrystalline glass in the prior art, and provide a microcrystalline glass and a preparation method thereof.

[0007] The present invention also provides an application of microcrystalline glass, and the microcrystalline glass material can be widely used in the fields of architectural decoration, mechanical industry, etc.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] A microcrystalline glass comprises the following components in percentage by weight: 51-65% yellow phosphorus slag, 25-40% SiO2, 1-5% Al2O3, 1-10% B2O3, 1-5% TiO2 and 1-5% ZnO.

[0010] Preferably, the microcrystalline glass comprises the following components in percentage by weight: yellow phosphorus slag 55-60%, SiO2 28-40%, Al2O3 1-5%, B2O3 1-10%, TiO2 3-5%, and ZnO 1-2%.

[0011] Furthermore, the main chemical components of the yellow phosphorus slag of the microcrystalline glass include the following weight percentages: CaO 42-50%, Al2O3 3-6%, SiO2 39-45%, Na2O 0.2-0.5%, K2O 0.5-1.0%, MgO 1.0-1.5%, Fe2O3 1.0-1.5%, and P2O5 2-3%.

[0012] Furthermore, a method for preparing glass-ceramics comprises the following steps:

[0013] (1) Ingredients: Ingredients are prepared according to the chemical composition analysis of slag and product requirements according to weight percentage, wherein the yellow phosphorus slag is crushed and ground to a particle size of 200-300 meshes, and other raw materials are dried to remove moisture, and then each raw material is accurately weighed according to the proportion and mixed uniformly to obtain a mixed raw material;

[0014] (2) Melting: The mixed raw materials are placed in a crucible and then melted in a high-temperature furnace at a melting temperature of 1450-1550° C. for 6-8 hours to fully melt the raw materials and mix them evenly to form a uniform glass liquid. During the melting process, a mechanical stirring device is used to stir the glass liquid at a stirring speed of 60-80 rpm to promote uniform mixing of the raw materials and complete reaction;

[0015] (3) Water quenching: Pour the molten glass into water at a temperature of 0-30°C for water quenching. The quenched glass particles are dried and then ground to 80-120 mesh;

[0016] (4) Molding: Add 0.2%-0.5% MnO2 as a crystal nucleating agent to the sieved glass powder, mix the crystal nucleating agent and the glass powder evenly, put them into a mold and press them into a desired shape. The molding pressure is 5-10 MPa;

[0017] (5) Crystallization: The pressed sample to be crystallized is placed in a crystallization furnace, heated to 1000-1200°C at a heating rate of 10-30°C / min, sintered at this temperature for 2-3 hours, cooled to 800-900°C at a cooling rate of 4-10°C / min, and crystallized for 6-8 hours to allow the microcrystalline phase to grow fully. The sample is then cooled to 580-650°C at a cooling rate of 2-3°C / min and annealed for 3-5 hours. The sample is then cooled to room temperature in the furnace and processed to produce microcrystalline glass products.

[0018] Furthermore, in the method for preparing microcrystalline glass, the crystallization furnace is a reducing atmosphere;

[0019] The reducing atmosphere during the crystallization is achieved by placing carbon powder on a ceramic boat next to the sample to be crystallized and heating it synchronously. The amount of carbon powder used is 0.5-1.0% of the weight of the sample to be crystallized.

[0020] The present invention also provides a microcrystalline glass material, which is prepared according to the preparation method.

[0021] The microcrystalline glass has excellent mechanical properties, with a bending strength greater than 50MPa; the microcrystalline glass has excellent chemical stability, with water resistance of level I, acid resistance of level II or above, and alkali resistance of level I; the microcrystalline glass has high hardness, with a Mohs hardness greater than 6.0; the microcrystalline glass has low water absorption, which is less than 0.02%.

[0022] The present invention further provides an application of the microcrystalline glass material in the fields of architectural decoration and mechanical industry.

[0023] The microcrystalline glass of the present invention is a CaO-Al2O3-SiO2 microcrystalline glass, and yellow phosphorus slag is used as the main raw material to prepare the microcrystalline glass, and the weight percentage of the yellow phosphorus slag is 51-65%, wherein the main chemical components of the yellow phosphorus slag include the following weight percentages: CaO 42-50%, Al2O3 3-6%, SiO2 39-45%, Na2O 0.2-0.5%, K2O 0.5-1.0%, MgO 1.0-1.5%, Fe2O3 1.0-1.5%, P2O 52-3%. The weight percentage of the yellow phosphorus slag is greater than 65%, which is not conducive to the formation of microcrystalline glass; the weight percentage of the yellow phosphorus slag is less than 51%, and the mixing ratio of the yellow phosphorus slag is too small, which is not conducive to the reduction of the production cost of the microcrystalline glass.

[0024] In the microcrystalline glass of the present invention, SiO2 is the main oxide forming the skeleton network of the CaO-Al2O3-SiO2 system microcrystalline glass, and forms an irregular glass main skeleton network with silicon oxygen tetrahedron [SiO4], which has a great influence on the viscosity of the glass. The weight percentage of SiO2 is 25-40%. Properly increasing the SiO2 content is conducive to alleviating the tendency of high-temperature crystallization, but the weight percentage of more than 40% will make the glass viscosity too high and difficult to crystallize; and the weight percentage of SiO2 is less than 20%, the glass is easy to lose transparency and cannot be formed.

[0025] Al 3+ Can replace Si 4+ The formation of [AlO4] tetrahedral structure plays a role in filling the network, which can improve the chemical and thermal stability of glass, enhance mechanical strength and hardness, and increase density. At the same time, it can also improve the stability of the glass network structure, increase the viscosity of the glass, reduce the migration and diffusion rate of atoms and ions, and lead to an increase in the crystallization temperature of the matrix glass. The weight percentage of Al2O3 is 1-5%, and the Al2O3 content is higher than 5%. 3+It exists in the form of [AlO4] tetrahedron, reconnecting the broken network with silicon oxygen tetrahedron to form a unified network, but the number of ion migration in the glass is reduced, the viscosity is increased, the glass is not easy to melt, the phase separation and crystallization of the glass are inhibited, and the precipitation of crystals will be reduced; if the Al2O3 content is lower than 1%, it will cause problems such as uneven crystal distribution and coarse crystal particles.

[0026] B2O3 is a glass-forming oxide and a component of the glass skeleton. It is also a flux that reduces the viscosity of the glass melt. In an oxidizing atmosphere, B 3+ There is a tendency to capture free oxygen to form boron-oxygen tetrahedron [BO4], making the glass structure more compact, thereby improving the chemical stability of the glass. The weight percentage of B2O3 is 1-10%. When the weight percentage of B2O3 is less than 1%, it cannot play a role in fluxing. When the weight percentage of B2O3 is higher than 10%, the chemical stability of the glass will be reduced.

[0027] TiO2 is a flux in the glass melting process. It can accelerate the melting of glass, lower the melting temperature of glass, reduce energy consumption, and is beneficial to the formation and crystallization of glass. The weight percentage of TiO2 is 1-5%, but when the TiO2 content is higher than 5%, it will cause the precipitation of foreign crystals, and the glass will easily produce phase separation, which will destroy the physical and chemical properties of microcrystalline glass. When the TiO2 content is lower than 1%, it will make the glass difficult to melt.

[0028] ZnO is a network external oxide and a regulator of glass structure. It can adjust the viscosity of glass and promote glass phase separation and crystallization. The content of ZnO affects the melting and crystallization of the base glass. The weight percentage of ZnO is 1-5%. If the ZnO content is less than 1%, it is not easy to reduce the viscosity of the glass; if the ZnO content is greater than 5%, most of the ZnO enters the crystal phase, which increases the viscosity, limits the diffusion of particles and hinders the growth of crystals, thereby limiting the crystallization process.

[0029] MnO2 is an important nucleating agent that promotes the crystallization of microcrystalline glass, and is also a coloring agent for microcrystalline glass. Manganese ions can weaken the glass network structure, increase the number of non-bridging oxygen, reduce the activation energy of glass crystallization and promote glass crystallization. MnO2 can reduce the transition temperature of glass, which is beneficial to the crystallization of glass. The weight percentage of MnO2 as a nucleating agent is 0.2%-0.5% of the weight of the molding powder. If the content of MnO2 is higher than 0.5%, the crystallization particles of microcrystalline glass are too large, which is not conducive to obtaining microcrystalline glass with excellent mechanical properties; if the content of MnO2 is lower than 0.2%, it is not conducive to the formation and crystallization of microcrystalline glass.

[0030] Carbon powder is used as a reducing atmosphere generator. The amount of carbon powder used is 0.5-1.0% of the weight of the sample to be crystallized. If carbon powder is not added to the microcrystalline glass sample to be crystallized, the weight percentage of carbon powder is greater than 1%, which is not conducive to the control of production costs. If the weight percentage of carbon powder is less than 0.5%, it is not conducive to the formation of a reducing atmosphere and will reduce the chemical resistance of the microcrystalline glass.

[0031] The microcrystalline glass described in the present invention also substantially contains other impurities; substantially not containing a specific component here means that it is not intentionally added, and it is mainly an extremely small amount of impurities inevitably mixed in from raw material impurities, etc., which will not affect the desired properties. Even if it contains an extremely small amount, it is brought in by the raw materials.

[0032] The CaO-Al2O3-SiO2 series microcrystalline glass is prepared with the yellow phosphorus slag provided by the present invention as the main raw material. The prepared microcrystalline glass can be crystallized as a whole, the grain size is uniform, and the grains are uniformly distributed in the glass phase. The flexural strength of the microcrystalline glass reaches or even exceeds the national standard.

[0033] Compared with the prior art, the microcrystalline glass described in the present invention has the following advantages:

[0034] (1) Excellent mechanical properties, with a bending strength greater than 50MPa;

[0035] (2) It has excellent chemical stability, with water resistance of Class I, acid resistance of Class II or above, and alkali resistance of Class I;

[0036] (3) It has a high hardness, with a Mohs hardness greater than 6.0;

[0037] (4) It has a low water absorption rate of less than 0.02%;

[0038] (5) By optimizing the raw material formula and preparation process, a high mixing ratio of yellow phosphorus slag is achieved, up to 65%, which greatly improves the utilization rate of yellow phosphorus slag and reduces environmental pollution.

[0039] The present invention successfully prepares a microcrystalline glass material with excellent mechanical properties and chemical corrosion resistance by strictly controlling process parameters such as melting, molding and crystallization. The present invention also provides an application of microcrystalline glass, which can be widely used in the fields of architectural decoration, mechanical industry, etc., and has broad market prospects and good economic and environmental benefits. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation mode of the present invention is further described in detail below. However, the specific embodiments given by the applicant cannot and should not be regarded as limitations on the technical solution of the present invention. Any changes to the definitions of components or technical features and / or formal but not substantial changes to the overall structure should be regarded as the scope of protection defined by the technical solution of the present invention.

[0041] Table 1 lists in detail the chemical composition (wt.%) of the glass-ceramics of the examples and various properties of the glass-ceramics.

[0042] Table 1 Chemical composition (wt.%) and various properties of the examples

[0043]

[0044] First, raw materials are selected and formulated according to the preparation of microcrystalline glass in the embodiment of Table 1, wherein the raw materials are required to be quartz sand (150μm sieve oversize is less than 1%, 45μm sieve undersize is less than 30%), alumina powder (chemically pure, average particle size 50μm), anhydrous boric acid (chemically pure, 400μm sieve oversize is less than 10%, 63μm sieve undersize is less than 10%), titanium oxide (chemically pure, average particle size 50μm), zinc oxide (chemically pure, average particle size 50μm), manganese dioxide (chemically pure, average particle size 50μm), and carbon powder (charcoal powder, 100-500 mesh).

[0045] Among them, the Mohs hardness, water absorption and bending strength of microcrystalline glass were tested with reference to JC / T 872-2019 "Microcrystalline glass for architectural decoration"; the chemical resistance stability of microcrystalline glass was tested with reference to the method of GB / T 3810.13-2016 "Test methods for ceramic tiles Part 13: Determination of chemical corrosion resistance".

[0046] Example 1

[0047] The main chemical components of yellow phosphorus slag include the following weight percentages: CaO 43.0%, Al2O3 5.8%, SiO2 44.8%, Na2O 0.4%, K2O 0.7%, MgO 1.3%, Fe2O3 1.2%, and P2O 52.8%.

[0048] According to the designed formula, the optimal proportion of the formula components is selected and prepared according to the following steps:

[0049] (1) Ingredients: Ingredients are prepared according to the specific weight percentages of Example 1 in Table 1, wherein the yellow phosphorus slag is crushed and ground to a particle size of 250 mesh, and the other raw materials are dried to remove moisture, and then the raw materials are accurately weighed according to the proportions and mixed uniformly to obtain a mixed raw material;

[0050] (2) Melting: The mixed raw materials are placed in a crucible and then melted in a high-temperature furnace at a melting temperature of 1500° C. for 7 hours to allow the raw materials to be fully melted and uniformly mixed to form a uniform glass liquid. During the melting process, a mechanical stirring device is used to stir the glass liquid at a stirring speed of 70 rpm to promote uniform mixing of the raw materials and complete reaction;

[0051] (3) Water quenching: Pour the molten glass into water at a temperature of 25°C for water quenching. The quenched glass particles are dried and then ground to 100 mesh;

[0052] (4) Molding: Add 0.4% MnO2 as a crystal nucleating agent to the sieved glass powder, mix the crystal nucleating agent and the glass powder evenly, put them into a mold and press them into a desired shape. The molding pressure is 8.0 MPa;

[0053] (5) Crystallization: The pressed sample to be crystallized is placed in a crystallization furnace with a reducing atmosphere. The reducing atmosphere during crystallization is achieved by placing carbon powder next to the sample to be crystallized in a ceramic boat. The amount of carbon powder used is 0.8% of the weight of the sample to be crystallized. The sample is then heated to 1100°C at a heating rate of 20°C / min, sintered for 2.5 hours, cooled to 850°C at a cooling rate of 7°C / min, and crystallized for 7 hours to allow the microcrystalline phase to grow fully. The sample is then cooled to 630°C at a cooling rate of 2.5°C / min and annealed for 4 hours. The sample is then cooled to room temperature in the furnace. The microcrystalline glass product is processed and the corresponding samples are prepared for performance testing. The test structure is shown in Table 1, Example 1.

[0054] Example 2

[0055] The main chemical components of yellow phosphorus slag include the following weight percentages: CaO 50.0%, Al2O3 4.0%, SiO2 40.8%, Na2O 0.2%, K2O 1.0%, MgO 1.0%, Fe2O3 1.0%, and P2O 52.0%.

[0056] According to the designed formula, the optimal proportion of the formula components is selected and prepared according to the following steps:

[0057] (1) Ingredients: Ingredients are prepared according to the specific weight percentages of Example 1 in Table 1, wherein the yellow phosphorus slag is crushed and ground to a particle size of 200 meshes, and the other raw materials are dried to remove moisture, and then the raw materials are accurately weighed according to the proportions and mixed uniformly to obtain a mixed raw material;

[0058] (2) Melting: The mixed raw materials are placed in a crucible and then melted in a high-temperature furnace at a melting temperature of 1450° C. for 8 hours to allow the raw materials to be fully melted and uniformly mixed to form a uniform glass liquid. During the melting process, a mechanical stirring device is used to stir the glass liquid at a stirring speed of 60 rpm to promote uniform mixing of the raw materials and complete reaction;

[0059] (3) Water quenching: Pour the molten glass into water at a temperature of 30°C for water quenching. The quenched glass particles are dried and then ground to 120 mesh;

[0060] (4) Molding: Add 0.5% of MnO2 by weight of the powder to the sieved glass powder as a crystal nucleating agent, mix the crystal nucleating agent and the glass powder evenly, put them into a mold and press them into a green body of a desired shape, and the molding pressure is 10.0 MPa;

[0061] (5) Crystallization: The pressed sample to be crystallized is placed in a crystallization furnace with a reducing atmosphere. The reducing atmosphere during crystallization is achieved by placing carbon powder in a ceramic boat next to the sample to be crystallized. The amount of carbon powder used is 1.0% of the weight of the sample to be crystallized. The sample is then heated to 1200°C at a heating rate of 10°C / min, sintered for 3 hours, cooled to 800°C at a cooling rate of 10°C / min, and crystallized for 8 hours to allow the microcrystalline phase to grow fully. The sample is then cooled to 580°C at a cooling rate of 3°C / min and annealed for 5 hours. The sample is then cooled to room temperature in the furnace. The microcrystalline glass product is processed and the corresponding samples are prepared for performance testing. The test structure is shown in Table 1 Example 2.

[0062] Example 3

[0063] The main chemical components of yellow phosphorus slag include the following weight percentages: CaO 49.2%, Al2O3 4.8%, SiO2 39.0%, Na2O 0.5%, K2O 0.5%, MgO 1.5%, Fe2O3 1.5%, and P2O5 3.0%.

[0064] According to the designed formula, the optimal proportion of the formula components is selected and prepared according to the following steps:

[0065] (1) Ingredients: Ingredients are prepared according to the specific weight percentages of Example 1 in Table 1, wherein the yellow phosphorus slag is crushed and ground to a particle size of 300 meshes, and the other raw materials are dried to remove moisture, and then the raw materials are accurately weighed according to the proportions and mixed uniformly to obtain a mixed raw material;

[0066] (2) Melting: The mixed raw materials are placed in a crucible and then melted in a high-temperature furnace at a melting temperature of 1550° C. for 6 hours to allow the raw materials to be fully melted and uniformly mixed to form a uniform glass liquid. During the melting process, a mechanical stirring device is used to stir the glass liquid at a stirring speed of 80 rpm to promote uniform mixing of the raw materials and complete reaction;

[0067] (3) Water quenching: Pour the molten glass into water at a temperature of 0°C for water quenching. The quenched glass particles are dried and then ground to 80 mesh;

[0068] (4) Molding: Add 0.2% MnO2 as a crystal nucleating agent to the sieved glass powder, mix the crystal nucleating agent and the glass powder evenly, put them into a mold and press them into a green body of a desired shape. The molding pressure is 5.0 MPa.

[0069] (5) Crystallization: The pressed sample to be crystallized is placed in a crystallization furnace with a reducing atmosphere. The reducing atmosphere during crystallization is achieved by placing carbon powder in a ceramic boat next to the sample to be crystallized. The amount of carbon powder used is 0.5% of the weight of the sample to be crystallized. The sample is then heated to 1000°C at a heating rate of 30°C / min, sintered for 2 hours, cooled to 900°C at a cooling rate of 4°C / min, and crystallized for 6 hours to allow the microcrystalline phase to grow fully. The sample is then cooled to 650°C at a cooling rate of 2°C / min and annealed for 3 hours. The sample is then cooled to room temperature in the furnace. The microcrystalline glass product is processed and the corresponding samples are prepared for performance testing. The test structure is shown in Example 3 of Table 1.

[0070] Example 4

[0071] The main chemical components of yellow phosphorus slag include the following weight percentages: CaO 46.2%, Al2O3 3.0%, SiO2 45.0%, Na2O 0.3%, K2O 0.8%, MgO 1.2%, Fe2O3 1.3%, and P2O5 2.2%.

[0072] The formula composition of the microcrystalline glass refers to Example 4 in Table 1, using the same raw materials and raw material requirements as Example 1, and adopting the same microcrystalline glass preparation process system, annealing process system and test conditions. Its test performance is shown in Example 4 in Table 1.

[0073] Example 5

[0074] The main chemical components of yellow phosphorus slag include the following weight percentages: CaO 42.0%, Al2O3 6.0%, SiO2 45.0%, Na2O 0.4%, K2O 0.9%, MgO 1.4%, Fe2O3 1.4%, and P2O 52.9%.

[0075] The formula composition of the microcrystalline glass refers to Example 5 in Table 1, using the same raw materials and raw material requirements as Example 1, and adopting the same microcrystalline glass preparation process system, annealing process system and test conditions. Its test performance is shown in Example 5 in Table 1.

[0076] The present invention successfully prepares a microcrystalline glass material with excellent mechanical properties and chemical corrosion resistance by strictly controlling process parameters such as melting, molding and crystallization treatment.

[0077] The present invention also provides an application of microcrystalline glass. The microcrystalline glass material can be widely used in the fields of architectural decoration, mechanical industry, etc., and has broad market prospects and good economic and environmental benefits.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A glass-ceramic, characterized in that: The invention comprises the following components in percentage by weight: 51-65% of yellow phosphorus slag, 25-40% of SiO2, 1-5% of Al2O3, 1-10% of B2O3, 1-5% of TiO2 and 1-5% of ZnO.

2. The glass-ceramic according to claim 1, characterized in that: It preferably includes the following components in percentage by weight: yellow phosphorus slag 55-60%, SiO2 28-40%, Al2O3 1-5%, B2O3 1-10%, TiO2 3-5%, and ZnO 1-2%.

3. A glass-ceramic according to claim 1 or 2, characterized in that: The main chemical components of the yellow phosphorus slag include the following weight percentages: CaO 42-50%, Al2O3 3-6%, SiO2 39-45%, Na2O 0.2-0.5%, K2O 0.5-1.0%, MgO 1.0-1.5%, Fe2O3 1.0-1.5%, and P2O5 2-3%.

4. A method for preparing glass-ceramics according to any one of claims 1 to 3, characterized in that: The following steps are involved: (1) Ingredients: Ingredients are prepared according to the chemical composition analysis of slag and product requirements according to weight percentage, wherein the yellow phosphorus slag is crushed and ground to a particle size of 200-300 meshes, and other raw materials are dried to remove moisture, and then each raw material is accurately weighed according to the proportion and mixed uniformly to obtain a mixed raw material; (2) Melting: The mixed raw materials are placed in a crucible and then melted in a high-temperature furnace at a melting temperature of 1450-1550° C. for 6-8 hours to fully melt the raw materials and mix them evenly to form a uniform glass liquid. During the melting process, a mechanical stirring device is used to stir the glass liquid at a stirring speed of 60-80 rpm to promote uniform mixing of the raw materials and complete reaction; (3) Water quenching: Pour the molten glass into water at a temperature of 0-30°C for water quenching. The quenched glass particles are dried and then ground to 80-120 mesh; (4) Molding: Add 0.2%-0.5% MnO2 as a crystal nucleating agent to the sieved glass powder, mix the crystal nucleating agent and the glass powder evenly, put them into a mold and press them into a desired shape. The molding pressure is 5-10 MPa; (5) Crystallization: The pressed sample to be crystallized is placed in a crystallization furnace, heated to 1000-1200°C at a heating rate of 10-30°C / min, sintered at this temperature for 2-3 hours, cooled to 800-900°C at a cooling rate of 4-10°C / min, and crystallized for 6-8 hours to allow the microcrystalline phase to grow fully. The sample is then cooled to 580-650°C at a cooling rate of 2-3°C / min and annealed for 3-5 hours. The sample is then cooled to room temperature in the furnace and processed to produce microcrystalline glass products.

5. The method for preparing glass-ceramics according to claim 4, characterized in that: The crystallization furnace is a reducing atmosphere.

6. The method for preparing glass-ceramics according to claim 5, characterized in that: The reducing atmosphere during the crystallization is achieved by placing carbon powder on a ceramic boat next to the sample to be crystallized and heating it synchronously. The amount of carbon powder used is 0.5-1.0% of the weight of the sample to be crystallized.

7. A glass-ceramic material, characterized in that: It is prepared according to the preparation method according to any one of claims 1 to 6.

8. The glass-ceramic material according to claim 7, characterized in that: The microcrystalline glass has excellent mechanical properties, with a bending strength greater than 50 MPa; excellent chemical stability, with water resistance of level I, acid resistance of level II or above, and alkali resistance of level I; high hardness, with a Mohs hardness greater than 6.0; and low water absorption, with a water absorption rate of less than 0.02%.

9. Application of the microcrystalline glass material according to claim 8 in the fields of architectural decoration and mechanical industry.

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