A method of reducing the skin thickness of a boron-containing aluminosilicate glass melt

Abstract

The application discloses a method for reducing the thickness of boron-containing aluminosilicate glass melting material, which comprises the following steps: configuring SiO2, Al2O3, Na2O, K2O, MgO, CaO, B2O3 and ZrO2 in a certain proportion to form a glass batch; configuring mirabilite, carbon powder, water glass and water to form a composite modifier; adding the composite modifier into the glass batch to fully stir and mix, thereby forming an improved batch; preheating the improved batch in a quartz crucible; after preheating to a certain temperature, putting the improved batch into the quartz crucible; gradually heating the quartz crucible at a certain heating rate; accelerating the silicate reaction of the improved batch by the composite modifier; accelerating the melting of B2O3; heating to a predetermined holding temperature; and continuously holding at the holding temperature for a certain time, so that the improved batch is melted to form a glass liquid. The application effectively reduces the thickness of the glass melting material, reduces the volatilization of B2O3 during melting, and improves the content and uniformity of B2O3 in the glass.

Description

Technical Field

[0001] The present invention relates to the technical field of glass production, in particular to a method for reducing the thickness of a boron-aluminosilicate glass melt and a boron-aluminosilicate glass melting method. Background Art

[0002] With the development of electronic glass, manufacturers are upgrading and optimizing their glass formulations to achieve better scratch and drop resistance. Companies are gradually increasing the amount of B2O3, or boron oxide, in their formulations, in conjunction with alkali and alkaline earth metals. However, the use of B2O3 presents some challenges. B2O3 can cause aluminosilicate glass to develop a noticeable skin, similar to borosilicate glass. This skin can lead to poor production process stability and reduced glass surface quality, resulting in the formation of glass streaks and localized crystallization, significantly altering the glass composition, or causing the B2O3 content to fall significantly below the designed value. Currently, the B2O3 content in borosilicate glass is generally above 1.5%. Its primary function is to reduce glass viscosity at high temperatures, facilitating melting and clarification; at low temperatures, it creates a denser structure and improves the strength of the finished product.

[0003] Currently, there are two common approaches to dealing with the surface layer of glass during production. One approach, similar to the B2O3 fiberglass industry, involves designing a spillage capability into the production line. The surface layer of glass is regularly removed through spillage, while bottom-feeding techniques are employed to prevent it from entering the forming section. The other approach involves using a platinum channel, which fills the channel with molten glass and melts the surface layer using precise temperature control and high-temperature melting techniques. Each approach has its own advantages and disadvantages. The spillage method is primarily used in the fiberglass industry and is not suitable for use in float glass production lines. Platinum channels are generally used in production lines below 80 t / d. Their use in float glass production lines would require extensive structural modifications, which is costly and difficult to manage. Therefore, there is a need for a method that is suitable for large float glass production lines and does not require production line modifications to effectively reduce the thickness of the surface layer during the melting of boroaluminosilicate glass. Summary of the Invention

[0004] The present invention provides a method for reducing the skin thickness of a boron-aluminosilicate glass melt to solve the problems raised in the above background technology.

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

[0006] A method for reducing the skin thickness of boron-containing aluminosilicate glass during melting, characterized by comprising the following steps:

[0007] 1) SiO2, Al2O3, Na2O, K2O, MgO, CaO, B2O3, ZrO2, configure the above materials in a certain proportion to form a glass batch;

[0008] 2) Prepare a composite improver by mixing Glauber's salt, carbon powder, water glass and water in a certain proportion;

[0009] 3) Adding a composite improver into the glass batch material and stirring and mixing them thoroughly to form an improved batch material;

[0010] 4) Preheating is performed in a quartz crucible. After preheating to a certain temperature, the improved batch material is placed in the quartz crucible, and the quartz crucible is gradually heated at a certain heating rate. The composite improver accelerates the silicate reaction of the improved batch material and accelerates the melting of B2O3 until it is heated to a predetermined holding temperature. The holding temperature is maintained for a certain period of time to melt the improved batch material into glass liquid.

[0011] Preferably, in the step 1), the ratio of each material in the glass batch is SiO2: 68.5wt%; Al2O3: 8wt%; Na2O: 7wt%; K2O: 1.5wt%; MgO: 7wt%; CaO: 3wt%; B2O3: 4wt%; ZrO2: 0.5wt%.

[0012] Preferably, in the step 2), the proportions of the materials in the composite improver are: 1%-5% of sodium sulfate, 1%-4% of carbon powder, 1%-8% of water glass, and 1.5%-7% of water.

[0013] Preferably, in the step 2), a portion of the improved batch material is extracted and kept at 1500-1600° C. for 5-6 hours to form a glass liquid, and the glass liquid is cooled to form a glass block, which is dissolved and the B2O3 content in the glass is detected.

[0014] Preferably, in step 4), the quartz crucible is a transparent quartz crucible.

[0015] Preferably, in the step 4), the preheating temperature of the quartz crucible is 1000°C-1100°C, and the heating rate after the improved batch material is put into the quartz crucible is 5°C / min to 1500°C-1600°C, the holding temperature is 1500°C-1600°C, and the holding time is 120min-130min.

[0016] The quartz crucible is provided with a high-temperature video observation device for heating and timed shooting and recording. During the heating and insulation process, the high-temperature video observation device shoots and records the clarity of the glass liquid and the thickness of the material skin in different heating time periods of the glass liquid.

[0017] A method for detecting the B2O3 content in glass is formed by the above-mentioned method of reducing the thickness of the boron-aluminosilicate glass melting material skin.

[0018] The above-mentioned high-temperature video observation device includes a heating furnace and an observation box. The quartz crucible is placed in the heating furnace. A camera is provided in the observation box. A controller is provided on the top of the observation box. An observation port is provided on one side of the observation box. A corundum tube connected to the interior of the heating furnace is provided on one side of the heating furnace. The port of the corundum tube faces the observation port, and the camera takes pictures of the interior of the heating furnace through the observation port and the corundum tube. The camera is electrically connected to the controller.

[0019] Preferably, a filter is provided at the observation port. The filter is used to help insulate the camera device from heat, preventing damage to the camera device from the high temperatures within the heating furnace. A quartz crucible is a transparent, rectangular crucible with a hollow interior and an open top. Multiple quartz crucibles can be placed side by side within the heating furnace, allowing the camera to simultaneously capture and compare images of multiple quartz crucibles.

[0020] The above method is also a boroaluminosilicate glass melting method.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The method of reducing the skin thickness of boron-containing aluminosilicate glass melts of the present invention comprises preparing sodium sulfate, carbon powder, water glass and water to form a composite improver, and adding the composite improver into a glass batch material so that the composite improver accelerates the silicate reaction of the improved batch material, accelerates the melting of B2O3, effectively reduces the thickness of the skin layer, improves the uniformity of the B2O3 component of the glass, and improves the clarity of the glass after forming. The preparation materials of the composite improver are all commonly used materials in chemical production, and the composite improver can be prepared by directly adding the composite improver into the glass batch material and stirring. The raw material cost is low, and no production line modification is required. The method is applicable to float glass processing for mass production of glass, and the raw material ratio of the composite improver can be adjusted accordingly according to the production of glass with different raw material components, and the method has strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a comparison chart of Sample 2 and the comparative example taken using a high-temperature visual observation device in the present invention;

[0024] Figure 2 Schematic diagram of the structure of the high-temperature video observation device of the present invention;

[0025] 1. Heating furnace; 2. Observation box; 3. Corundum tube; 4. Controller; 5. Observation port. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0027] Reference Figure 1-2 A method for reducing the skin thickness of a boron-aluminosilicate glass melt comprises the following steps:

[0028] 1) SiO2, Al2O3, Na2O, K2O, MgO, CaO, B2O3, ZrO2, configure the above materials in a certain proportion to form a glass batch;

[0029] 2) Prepare a composite improver by mixing Glauber's salt, carbon powder, water glass and water in a certain proportion;

[0030] 3) Adding a composite improver into the glass batch material and stirring and mixing them thoroughly to form an improved batch material;

[0031] 4) Preheating is performed in a quartz crucible. After preheating to a certain temperature, the improved batch material is placed in the quartz crucible, and the quartz crucible is gradually heated at a certain heating rate. The composite improver accelerates the silicate reaction of the improved batch material and accelerates the melting of B2O3 until it is heated to a predetermined holding temperature. The holding temperature is maintained for a certain period of time to melt the improved batch material into glass liquid.

[0032] In the step 2, the proportions of the materials in the composite improver are: 1%-5% of Glauber's salt, 1%-4% of carbon powder, 1%-8% of water glass, and 1.5%-7% of water.

[0033] In the step 2, a portion of the improved batch material is extracted and kept at 1500-1600°C for 5-6 hours to form a glass liquid. The glass liquid is cooled to form a glass block, and the glass block is dissolved to detect the B2O3 content in the glass.

[0034] In step 4, the quartz crucible is a transparent quartz crucible.

[0035] In the step 4, the preheating temperature of the quartz crucible is 1000°C-1100°C. After the improved batch material is put into the quartz crucible, the heating rate is increased to 1500°C-1600°C at a rate of 5°C / min, the holding temperature is 1500°C-1600°C, and the holding time is 120min-130min.

[0036] The quartz crucible is provided with a high-temperature video observation device for heating and timed shooting and recording. During the heating and insulation process, the high-temperature video observation device shoots and records the clarity of the glass liquid and the thickness of the material skin in different heating time periods of the glass liquid.

[0037] A method for detecting the B2O3 content in glass is formed by the above-mentioned method of reducing the thickness of the boron-aluminosilicate glass melting material skin.

[0038] Further as follows:

[0039] In step 1, the ratio of each material in the glass batch is SiO2: 68.5wt%; Al2O3: 8wt%; Na2O: 7wt%; K2O: 1.5wt%; MgO: 7wt%; CaO: 3wt%; B2O3: 4wt%; ZrO2: 0.5wt%.

[0040] The same glass batch material ratio is used, and the materials in the composite improver in step 2 are mixed in different ratios. The test results are as follows:

[0041]

[0042] In the above list, samples 1 to 4 were tested in a certain proportion, samples 5 to 8 were tested by removing the composite improver of Glauber's salt, carbon powder, water glass, and water, respectively, and the comparative sample was tested without adding the composite improver.

[0043] It can be seen from the above table that after the composite improver of the present invention is prepared in different ratios and reacted with the glass liquid, its skin thickness and B2O3 performance are better than the glass liquid without adding the composite improver. Among them, samples 1 to 4 are all materials and are tested with composite improvers in different ratios. Their skin thickness and B2O3 content are significantly better than the control example. The skin thickness and B2O3 content of samples 5 to 8 are still better than the control example. It can be seen that the composite improver of the present invention can effectively reduce the thickness of the glass melting skin while ensuring the B2O3 content and reducing the volatilization of B2O3 during the melting process.

[0044] The above-mentioned high-temperature video observation device includes a heating furnace 1 and an observation box 2. The quartz crucible is placed in the heating furnace 1. A camera is provided in the observation box 2. A controller 4 is provided on the top of the observation box 2. An observation port 5 is provided on one side of the observation box 2. A corundum tube 3 communicating with the interior of the heating furnace 1 is provided on one side of the heating furnace 1. The end of the corundum tube 3 faces the observation port 5, and the camera takes pictures of the interior of the heating furnace 1 through the observation port 5 and the corundum tube 3. The camera is electrically connected to the controller 4.

[0045] A filter is provided at the observation port 5. This filter helps the camera device provide heat insulation and light filtering, preventing damage to the camera device from the high temperatures within the heating furnace 1. The quartz crucible is a transparent, rectangular crucible with a hollow interior and an open top. Multiple quartz crucibles can be placed side by side within the heating furnace 1, allowing the camera device to simultaneously capture and compare images of multiple quartz crucibles.

[0046] A top cover is provided on the top of the heating furnace 1, and the quartz crucible is placed through the top of the heating furnace 1. At the same time, the controller 4 is used to observe whether the camera device can observe the glass liquid in the quartz crucible. An electric rotating table can be provided at the bottom of the heating furnace 1, and the quartz crucible is placed on the electric rotating table and rotates automatically, so that the camera device can shoot the quartz crucible at multiple angles in the horizontal direction when shooting.

[0047] The present invention adds a composite improver into the glass batch material, and the composite improver accelerates the silicate reaction of the improved batch material, effectively reduces the thickness of the glass melt skin, reduces the volatilization of B2O3 during melting, and improves the B2O3 content and uniformity in the glass. At the same time, it is applicable to large-scale float glass production lines without the need to modify the production lines.

[0048] The above method is also a boroaluminosilicate glass melting method.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0050] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for ensuring the B2O3 content and reducing the thickness of the boron-containing aluminosilicate glass melt, characterized in that: The steps are as follows: 1) SiO2, Al2O3, Na2O, K2O, MgO, CaO, B2O3, ZrO2, configure the above materials in a certain proportion to form a glass batch; 2) Prepare a composite improver by mixing Glauber's salt, carbon powder, water glass and water in a certain proportion; The proportion of each material in the composite improver is: 1%-5% of Glauber's salt, 1%-4% of carbon powder, 1%-8% of water glass, and 1.5%-7% of water; 3) Adding a composite improver into the glass batch material and stirring and mixing them thoroughly to form an improved batch material; 4) Preheating is performed in a quartz crucible. After preheating to a certain temperature, the improved batch material is placed in the quartz crucible, and the quartz crucible is gradually heated at a certain heating rate. The composite improver accelerates the silicate reaction of the improved batch material and accelerates the melting of B2O3 until it is heated to a predetermined holding temperature. The holding temperature is maintained for a certain period of time to melt the improved batch material into glass liquid.

2. The method for ensuring B2O3 content and reducing the thickness of boron-containing aluminosilicate glass melt according to claim 1, characterized in that: In the step 1), the ratio of each material in the glass batch is SiO2: 68.5wt%; Al2O3: 8wt%; Na2O: 7wt%; K2O: 1.5wt%; MgO: 7wt%; CaO: 3wt%; B2O3: 4wt%; ZrO2: 0.5wt%.

3. The method for ensuring B2O3 content and reducing the thickness of boron-containing aluminosilicate glass melt according to claim 1, characterized in that: In the step 3), a portion of the improved batch material is extracted and kept at 1500-1600°C for 5-6 hours to form a glass liquid. The glass liquid is cooled to form a glass block, and then the glass block is melted to detect the B2O3 content in the glass.

4. The method for ensuring B2O3 content and reducing the thickness of boron-containing aluminosilicate glass melt according to claim 1, characterized in that: In the step 4), the quartz crucible is a transparent quartz crucible.

5. The method for ensuring B2O3 content and reducing the thickness of boron-containing aluminosilicate glass melt according to claim 1, characterized in that: In the step 4), the preheating temperature of the quartz crucible is 1000°C-1100°C. After the improved batch material is put into the quartz crucible, the heating rate is increased to 1500°C-1600°C at a rate of 5°C / min, the holding temperature is 1500°C-1600°C, and the holding time is 120min-130min.

6. The method for ensuring B2O3 content and reducing the thickness of boron-containing aluminosilicate glass melt according to claim 5, characterized in that: The quartz crucible is provided with a high-temperature video observation device for heating and timed shooting and recording. During the heating and insulation process, the high-temperature video observation device shoots and records the clarity of the glass liquid and the thickness of the material skin in different heating time periods of the glass liquid.

7. A method for melting boroaluminosilicate glass, characterized in that: The method for melting boroaluminosilicate glass is formed by the method for ensuring the B2O3 content and reducing the thickness of the boroaluminosilicate glass melting material as described in any one of claims 1 to 6.

8. A method for detecting the content of B2O3 in glass, characterized in that: A method for detecting B2O3 content formed by the method of ensuring B2O3 content and reducing the thickness of the boron-aluminosilicate glass melting material as described in claim 3.

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