High performance glass and production process thereof

Abstract

The present invention relates to the field of glass production technology, and proposes a high-performance glass and a production process thereof. The high-performance glass comprises the following components A and B in weight proportions: component A: 70-82 parts of soda-lime cullet, 4-8.8 parts of cerium oxide-containing cullet; component B: 1-5 parts of potassium feldspar, 2-7.7 parts of sodium feldspar, 0.1-4 parts of lithium feldspar, and 3-6.5 parts of calcium feldspar. Through the above technical solution, the problems of large consumption of fossil raw materials and large carbon dioxide emissions in the glass production process in the prior art are solved, and the produced glass has low light transmittance, low mechanical strength, and poor thermal stability.

Description

Technical Field

[0001] The present invention relates to the technical field of glass production, and in particular to high-performance glass and a production process thereof. Background Art

[0002] At present, ordinary soda-lime-silica glass is made of quartz sand, soda ash, limestone, dolomite and other raw materials, which are melted at high temperature to form glass liquid, and then formed into specified products according to needs. There are a large number of carbonate raw materials in the glass composition, and a large number of fossil raw materials are used in the melting process, resulting in a large amount of carbon dioxide emissions during the glass melting process.

[0003] As global energy and environmental issues become increasingly serious, low-carbon and environmental protection has gradually become the choice of countries around the world, and is also the future direction of building energy conservation in my country. Glass is the core of building energy consumption. Reducing the consumption of fossil raw materials and reducing carbon dioxide emissions in the production process of glass are the most important aspects of glass production. In addition, the light transmittance, density, mechanical strength, hardness, etc. of glass will affect its use field. Therefore, producing a glass with high light transmittance, high hardness, and high mechanical strength is a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0004] The present invention proposes a high-performance glass and a production process thereof, which solves the problems in the related art of large consumption of fossil raw materials and large carbon dioxide emissions in the glass production process, and low light transmittance, low mechanical strength and poor thermal stability of the produced glass.

[0005] The technical solution of the present invention is as follows:

[0006] A high-performance glass comprises the following components A and B in parts by weight: component A comprises 70-82 parts of soda-lime cullet and 4-8.8 parts of cerium oxide-containing cullet; component B comprises 1-5 parts of potassium feldspar, 2-7.7 parts of sodium feldspar, 0.1-4 parts of lithium feldspar and 3-6.5 parts of calcium feldspar.

[0007] As a further technical solution, the composition of the soda-lime cullet is 72% SiO2, 1% Al2O3, 8.5% CaO, 4.3% MgO, 14% Na2O, and 0.2% SO3.

[0008] As a further technical solution, the composition of the cerium oxide-containing cullet is 70% SiO2, 10% CeO2, 3% K2O, 5% B2O3, and 12% Na2O.

[0009] As a further technical solution, the particle size of the soda-lime cullet and the cerium oxide-containing cullet is 2 to 10 mm.

[0010] The present invention also proposes a production process for high-performance glass, comprising the following steps:

[0011] S1, melt the B component and send it into the melting furnace at the bottom of the preheater for further heating, a feed inlet is arranged just above the melting furnace, and several layers of metal mesh are arranged between the feed inlet and the melting furnace;

[0012] S2, adding component A from the feed port of the preheater, and in the process of passing through several layers of metal mesh from top to bottom, component A is preheated by the energy generated by component B from bottom to top;

[0013] S3. The preheated component A and component B are mixed in a melting furnace, heated to form a uniform glass liquid, cooled and formed to obtain glass.

[0014] As a further technical solution, high-frequency electric heating is used for melting in S1.

[0015] As a further technical solution, the several layers of metal mesh in S1 and S2 include four layers of metal mesh with mesh sizes of 15-20 mm, 28-30 mm, 40-45 mm, and 50-60 mm from top to bottom.

[0016] As a further technical solution, the mesh holes of the four-layer metal mesh are circular.

[0017] As a further technical solution, the preheating temperature in S2 is 300°C.

[0018] As a further technical solution, the heating in S1 and S3 adopts electric auxiliary heating and flame heating.

[0019] The working principle and beneficial effects of the present invention are:

[0020] 1. The raw materials used in the production of glass of the present invention are mainly broken glass and ore raw materials, and the amount of broken glass added can reach more than 70%. At the same time, broken glass containing cerium oxide is used as a clarifier, and there is no need to use chemical raw materials, thereby reducing the secondary consumption of resources.

[0021] 2. On the one hand, the present invention adopts green electricity as a new melting energy to partially or completely replace fossil fuels, reduce the consumption of fossil raw materials, and reduce carbon dioxide emissions in the glass manufacturing process; on the other hand, it adopts low-carbon raw materials and low-carbon melting processes (high-frequency electric melting, electric-assisted heating melting and flame heating melting), and at the same time adopts flue gas waste heat recovery technology to reduce energy consumption, reduce carbon emissions in the glass production process, and achieve low carbonization in the glass production process.

[0022] 3. The present invention uses a large amount of cullet as the main raw material, and other raw materials use non-carbonate raw materials including potassium feldspar, sodium feldspar, lithium feldspar, calcium feldspar, etc. to replace carbonate raw materials including soda ash, potassium carbonate, limestone, etc., to further reduce carbon dioxide emissions. At the same time, a separate melting technical solution is adopted in the melting process, and a high-frequency electric melting technology is used in the feldspar silicate material to make it melt quickly and enter the clarification zone. This part of the glass liquid uses flame melting to supply energy on the upper side, and electric auxiliary heating to supply energy on the lower side. The high-temperature combustion products enter the cullet preheating zone from bottom to top, preheating the cullet with a particle size of 2 to 10 mm, further utilizing the combustion energy. At the same time, four layers of metal mesh with mesh sizes of 15 to 20 mm, 28 to 30 mm, 40 to 45 mm, and 50 to 60 mm are used to control the speed of the cullet from top to bottom. The cullet can be preheated to 300°C, accelerating the melting and clarification of the glass. The preheated cullet enters the melting furnace and is homogenized to form a uniform glass liquid before entering the forming stage. The final glass has high light transmittance, high strength, and good thermal stability.

[0023] 4. The present invention controls the particle size of the cullet to be between 2 and 10 mm. When the particle size is too large, the surface area is small, the preheating stability is low, and the effect cannot be achieved. When the particle size is too small, the cullet will agglomerate during the preheating and falling processes and stick to the preheating equipment. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The meshes of the four-layer metal mesh in the following Examples 1 to 6 and Comparative Examples 1 to 3 are circular, and the four-layer metal mesh includes four layers of metal mesh with meshes of 15 to 20 mm, 28 to 30 mm, 40 to 45 mm, and 50 to 60 mm from top to bottom in the preheater; the particle sizes of soda-lime cullet and cerium oxide-containing cullet are within 2 to 10 mm.

[0026] The composition of the soda-lime cullet in the following Examples 1 to 4 and Comparative Examples 1 to 3 is 72% SiO2, 1% Al2O3, 8.5% CaO, 4.3% MgO, 14% Na2O, and 0.2% SO3; the composition of the cerium oxide-containing cullet is 70% SiO2, 10% CeO2, 3% K2O, 5% B2O3, and 12% Na2O, and they were purchased from Qinhuangdao Xingjian Special Glass Co., Ltd.

[0027] Example 1

[0028] S1. Prepare materials: Component A: 75 parts of soda-lime cullet, 7 parts of cerium oxide-containing cullet; Component B: 3 parts of potassium feldspar, 7 parts of sodium feldspar, 3 parts of lithium feldspar, and 5 parts of calcium feldspar;

[0029] S2, using a high-frequency electric melting device to melt component B in a melting chamber, and then feeding it into a melting furnace at the bottom of a preheater, wherein the preheater has four layers of metal mesh;

[0030] S3, adding component A from the feed port of the preheater, and in the process of passing through the four layers of metal mesh from top to bottom, component A is preheated to 300°C by the bottom-up energy generated by component B;

[0031] S4. The preheated component A and component B are mixed in a melting furnace to form a uniform glass liquid, which is cooled and formed to obtain glass.

[0032] Example 2

[0033] S1. Prepare materials: Component A: 70 parts of soda-lime cullet, 6.8 parts of cerium oxide-containing cullet; Component B: 5 parts of potassium feldspar, 7.7 parts of sodium feldspar, 4 parts of lithium feldspar, and 6.5 parts of calcium feldspar;

[0034] S2, using a high-frequency electric melting device to melt component B in a melting chamber, and then feeding it into a melting furnace at the bottom of a preheater, wherein the preheater has four layers of metal mesh;

[0035] S3, adding component A from the feed port of the preheater, and in the process of passing through the four layers of metal mesh from top to bottom, component A is preheated to 300°C by the bottom-up energy generated by component B;

[0036] S4. The preheated component A and component B are mixed in a melting furnace to form a uniform glass liquid, which is cooled and formed to obtain glass.

[0037] Example 3

[0038] S1. Prepare materials: Component A: 82 parts of soda-lime cullet, 8.8 parts of cerium oxide-containing cullet; Component B: 1 part of potassium feldspar, 2 parts of sodium feldspar, 0.1 parts of lithium feldspar, and 6.1 parts of calcium feldspar;

[0039] S2, using a high-frequency electric melting device to melt component B in a melting chamber, and then feeding it into a melting furnace at the bottom of a preheater, wherein the preheater has four layers of metal mesh;

[0040] S3, adding component A from the feed port of the preheater, and in the process of passing through the four layers of metal mesh from top to bottom, component A is preheated to 300°C by the bottom-up energy generated by component B;

[0041] S4. The preheated component A and component B are mixed in a melting furnace to form a uniform glass liquid, which is cooled and formed to obtain glass.

[0042] Example 4

[0043] S1. Prepare materials: Component A: 80 parts of soda-lime cullet, 4 parts of cerium oxide-containing cullet; Component B: 4 parts of potassium feldspar, 5.2 parts of sodium feldspar, 3.8 parts of lithium feldspar, and 3 parts of calcium feldspar;

[0044] S2, using a high-frequency electric melting device to melt component B in a melting chamber, and then feeding it into a melting furnace at the bottom of a preheater, wherein the preheater has four layers of metal mesh;

[0045] S3, adding component A from the feed port of the preheater, and in the process of passing through the four layers of metal mesh from top to bottom, component A is preheated to 300°C by the bottom-up energy generated by component B;

[0046] S4. The preheated component A and component B are mixed in a melting furnace to form a uniform glass liquid, which is cooled and formed to obtain glass.

[0047] Example 5

[0048] The only difference from Example 1 is that the composition of the soda-lime cullet is: 70% SiO2, 2% Al2O3, 8% CaO, 4% MgO, 16% Na2O.

[0049] Example 6

[0050] The only difference from Example 1 is that the composition of the cerium oxide-containing cullet is: 67% SiO2, 5% CeO2, 3% K2O, 10% B2O3, and 15% Na2O.

[0051] Comparative Example 1

[0052] S1. Prepare materials: Component A: 75 parts of soda-lime cullet, 7 parts of cerium oxide-containing cullet; Component B: 3 parts of potassium feldspar, 7 parts of sodium feldspar, 3 parts of lithium feldspar, and 5 parts of calcium feldspar;

[0053] S2, using a high-frequency electric melting device to melt component B in a melting chamber and then feeding it into a melting furnace;

[0054] S3. Component A is directly added to the melting furnace for heating and melting to form a uniform glass liquid, which is then cooled and formed to obtain glass.

[0055] Comparative Example 2

[0056] The only difference from Example 1 is that component A is preheated to 100°C.

[0057] Comparative Example 3

[0058] The only difference from Example 1 is that component A is preheated to 500°C.

[0059] The 5 mm thick flat glass obtained in Examples 1 to 6 and Comparative Examples 1 to 3 was subjected to various performance tests, and the test results are recorded in Table 1:

[0060] Table 1 Properties of glass

[0061]

[0062]

[0063] It can be seen from Table 1 that the glass provided by Examples 1 to 4 of the present invention has a light transmittance of more than 86.7%, a compressive strength of more than 663 MPa, a flexural strength of more than 92 MPa, and a Mohs hardness of more than 6.2. While having high light transmittance, it also has excellent mechanical strength and thermal stability.

[0064] Since the difference between Example 5 and Example 1 is that the composition of the soda-lime cullet is 70% SiO2, 2% Al2O3, 8% CaO, 4% MgO, and 16% Na2O, and the difference between Example 6 and Example 1 is that the composition of the cerium oxide-containing cullet is 67% SiO2, 5% CeO2, 3% K2O, 10% B2O3, and 15% Na2O, the performance of the glasses obtained in Examples 5 and 6 is not as good as that in Example 1. Therefore, only when the soda-lime cullet with the composition of 72% SiO2, 1% Al2O3, 8.5% CaO, 4.3% MgO, 14% Na2O, and 0.2% SO3 and the cerium oxide-containing cullet with the composition of 70% SiO2, 10% CeO2, 3% K2O, 5% B2O3, and 12% Na2O are used as raw materials, the performance of the glasses obtained is the best in all aspects.

[0065] The only difference between Comparative Example 1 and Example 1 is that component A is not preheated, the only difference between Comparative Example 2 and Example 1 is that component A is preheated to 100°C, and the only difference between Comparative Example 3 and Example 1 is that component A is preheated to 500°C. The performance of the glasses obtained in Comparative Examples 1 to 3 is also not as good as that in Example 1. Therefore, the performance of the glass finally obtained is the best only when component A is preheated to 300°C.

[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high performance glass, characterized in that: The invention comprises the following components A and B in parts by weight: component A: 70-82 parts of soda-lime cullet, 4-8.8 parts of cerium oxide-containing cullet; component B: 1-5 parts of potassium feldspar, 2-7.7 parts of sodium feldspar, 0.1-4 parts of lithium feldspar, and 3-6.5 parts of calcium feldspar; The composition of the soda-lime cullet is 72% SiO2, 1% Al2O3, 8.5% CaO, 4.3% MgO, 14% Na2O, 0.2% SO3; The composition of the cerium oxide-containing cullet is 70% SiO2, 10% CeO2, 3% K2O, 5% B2O3, and 12% Na2O.

2. The high performance glass according to claim 1, characterized in that: The particle sizes of the soda-lime cullet and the cerium oxide-containing cullet are 2 to 10 mm.

3. The production process of high-performance glass according to claim 1, characterized in that: The following steps are involved: S1, melt the B component and send it into the melting furnace at the bottom of the preheater for further heating, a feed inlet is arranged just above the melting furnace, and several layers of metal mesh are arranged between the feed inlet and the melting furnace; S2, adding component A from the feed port of the preheater, and in the process of passing through several layers of metal mesh from top to bottom, component A is preheated by the energy generated by component B from bottom to top; S3, the preheated component A and component B are mixed in a melting furnace, heated to form a uniform glass liquid, cooled and formed to obtain glass; The preheating temperature in S2 is 300°C.

4. A production process for high-performance glass according to claim 3, characterized in that: The melting in S1 is carried out by high-frequency electric heating.

5. The production process of high-performance glass according to claim 3, characterized in that: The several layers of metal mesh in S1 and S2 include four layers of metal mesh with mesh sizes of 15-20 mm, 28-30 mm, 40-45 mm, and 50-60 mm from top to bottom.

6. A production process for high-performance glass according to claim 5, characterized in that: The meshes of the four-layer metal mesh are circular.

7. The production process of high-performance glass according to claim 3, characterized in that: The heating in S1 and S3 adopts electric auxiliary heating and flame heating.

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